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Impervious areas

Tags
land surface, radiance or imagery, Maine, environment, urbanization, USA, runoff, impervious area, land use/land cover, imageryBaseMapsEarthCover


Summary

IMPERV quantifies impervious features at a 5 meter spatial resolution over the State of Maine.

Description

IMPERV is a raster data set of impervious areas, derived from 5 meter SPOT imagery collected in the summer of 2004 over the State of Maine. IMPERV is part of a larger mapping initiative by the State of Maine to quantify land cover (MELCD) at a 5 meter resolution over the entire state. Areas of imperviousness are characterized by anthropogenic features such as buildings, roads, parking lots, etc. Pixel values of 0 (zero) indicate an impervious land cover, while pixel values of 1 (one) indicate pervious land cover features.

Credits

Credit should always be given to the data source and/or originator(s) when the data is transferred or printed.

Use limitations

Users must assume responsibility in determining the usability of this data for their purposes. Digital maps retain the accuracy of their source materials. The best use of data mapped at scales of 1:500,000 and 1:250,000 is in statewide planning and studies; at 1:100,000 in regional planning and studies; at 1:62,500 and 1:24,000 in detailed studies and local planning; and at 1:12,000 and 1:5,000 or larger scales in parcel level studies and detailed local planning. In the use of Maine GIS data, please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the correct copy of both data and metadata from the Maine GIS Data Catalog. Updates, corrections, and feedback, incorporated in the Maine GIS database are made in accordance with "Data Standards for Maine Geographic Information Systems", 2002 and coordinated by MEGIS

Extent

Scale Range
Maximum (zoomed in)  1:5,000
Minimum (zoomed out)  1:150,000,000

ArcGIS Metadata 

Topics and Keywords 

Themes or categories of the resource  imageryBaseMapsEarthCover, geoscientificInformation


Content type  Downloadable Data
Export to FGDC CSDGM XML format as Resource Description No

Place keywords  Maine, USA

Thesaurus
Title Maine GIS Thesaurus-Place




Stratum keywords  land surface, radiance or imagery

Thesaurus
Title GCMD Parameter Keyword




Theme keywords  urbanization, runoff, impervious area, land use/land cover

Thesaurus
Title Maine GIS Thesaurus-Theme




Theme keywords  environment, imageryBaseMapsEarthCover

Thesaurus
Title ISO Keyword Thesaurus




Citation 

Title Impervious areas
Publication date 2005-10-18


Presentation formats  digital map
FGDC geospatial presentation format  remote-sensing image


Series
Name Maine GIS
Issue SDE server; Internet Data Catalog

Other citation details 1:24000


Citation Contacts 

Responsible party
Organization's name Maine Office of Geographic Information Systems (MEGIS)
Contact's role  publisher


Contact information
Address
Delivery point Augusta ME



Responsible party
Organization's name Maine Library of Geographic Information (MLGI), Maine Department of Environmental Protection (MEDEP), Maine Department of Inland Fisheries and Wildlife (MEIFW), Maine Department of Transportation (MEDOT), Maine Department of Health and Human Services, Drinking Water Program (MEDHHSDWP) and the Maine State Planning Office (MESPO) with the Maine GIS Executive Council (GISEC), U.S. Geological Survey (USGS), National Oceanographic and Atmospheric Administration (NOAA), Space Imaging (SI), and Sanborn
Contact's role  originator


Resource Details 

Dataset languages  English
Dataset character set  utf8 - 8 bit UCS Transfer Format


Status  completed


Supplemental information
A spread sheet IMPERV5M.xls distributed with IMPERV provides error assessment results based on the stratified random selection of 298, 25m2 validation samples.
Processing environment Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 9.0.0.535; Maine Office of Information Technology (OIT) Oracle 9i, Maine Office of Geographic Information Systems (MEGIS), Maine GIS SDE Maine GIS Internet Data Catalog http://megis.maine.gov/catalog/


Credits
Credit should always be given to the data source and/or originator(s) when the data is transferred or printed.
ArcGIS item properties

Extents 

Extent
Geographic extent
Bounding rectangle
West longitude -71.166741
East longitude -66.849521
South latitude 42.970783
North latitude 47.460073

Extent
Description
publication date
Temporal extent
Date and time 2005-05-01
Indeterminate time unknown

Resource Points of Contact 

Point of contact
Organization's name (MEDEP) Maine Department of Environmental Protection
Contact's position Senior Database Analyst
Contact's role  point of contact


Contact information
Phone
Voice (207)287-4292
Fax (207)287-7896

Address
Type postal
Delivery point SHS 17
City Augusta
Administrative area ME
Postal code 04333
Country US



Resource Maintenance 

Resource maintenance
Update frequency  not planned


Resource Constraints 

Legal constraints
Limitations of use
Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.
Limitations of use
Users must assume responsibility to determine the usability of this data for their purposes.
Security constraints
Classification  unclassified


Constraints
Limitations of use
Users must assume responsibility in determining the usability of this data for their purposes. Digital maps retain the accuracy of their source materials. The best use of data mapped at scales of 1:500,000 and 1:250,000 is in statewide planning and studies; at 1:100,000 in regional planning and studies; at 1:62,500 and 1:24,000 in detailed studies and local planning; and at 1:12,000 and 1:5,000 or larger scales in parcel level studies and detailed local planning. In the use of Maine GIS data, please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the correct copy of both data and metadata from the Maine GIS Data Catalog. Updates, corrections, and feedback, incorporated in the Maine GIS database are made in accordance with "Data Standards for Maine Geographic Information Systems", 2002 and coordinated by MEGIS

Spatial Data Properties 

Georectified Grid
Number of dimensions 2


Axis dimensions properties
Dimension type  row (y-axis)
Dimension size 99355

Axis dimensions properties
Dimension type  column (x-axis)
Dimension size 65102

Cell geometry  area




Data Quality 

Scope of quality information
Resource level  dataset




Data quality report - Completeness omission
Measure description Data set is complete for the State of Maine.




Data quality report - Quantitative attribute accuracy
Measure description This data set was assessed based on the stratified random selection of 298, 25m2 validation samples. For a map at 90% accuracy using a 95% confidence level, the minimum number of sites required will be 298; with the map being rejected if more than 21 are misclassified. Each validation point was photo-interpreted by an analyst to determine its validation call (impervious or pervious) and to ensure that its entire area was a homogenous cover type. The cover type was determined by examining the SPOT imagery in conjunction with existing DOQQ imagery as further reference. A total of 16 validation points were deemed to be incorrect.


Quantitative test results
Value >= 90%


Evaluation method Sanborn has developed an efficient procedure to assess accuracy of the impervious classification. The desired map accuracy is 90% for a MMU of 0.89 acres. Since we are working with a two-case situation where we only wish to know whether the classification is right or wrong, we can use a binomial distribution to calculate the sample size. Using this assumption, we can use Ginevan (1978) who illustrates a sampling method using stratified random points that satisfies three criteria: o the scheme should have a low probability of accepting a map of low accuracy. o it should have a high probability of accepting a map of high accuracy. o it should require a minimum number of ground truth samples. Using the look-up table given in the paper that presents the required sample size for a given minimum error and a desired level of confidence, we have determined a specific number of points that are required to meet the accuracy specification. For a map at 90% accuracy using a 95% confidence level (at 95%, we run the risk of a 1 in 20 chance that we reject a map that is actually correct), the minimum number of sites required will be 298; with the map being rejected if more than 21 are misclassified.




Data quality report - Absolute external positional accuracy
Dimension horizontal


Measure description The SPOT data source for IMPERV specifies a positional (horizontal) accuracy 12 meters or better with 90% confidence.


Quantitative test results
Value 12


Evaluation method Data was derived from digital data that meets or exceeds National Map Accuracy Standards for 1:24,000 scale.




Lineage 

Process step
When the process occurred 2005-04-01
Description IMPERV was derived from 5 meter SPOT imagery collected in the summer of 2004 over the State of Maine. IMPERV is part of a larger mapping initiative by the State of Maine to quantify land cover at a 5 meter resolution over the entire state. Areas of imperviousness are characterized by anthropogenic features such as buildings, roads, parking lots, etc. Pixel values of 1 (one) indicate a pervious land cover, while pixel values of 0 (zero) indicate impervious land cover features.


Process contact
Organization's name Sanborn
Contact's position GIS / RS Analyst
Contact's role  processor


Contact information
Phone
Voice 734 213-1060
Fax 734 213-1085

Address
Type both
Delivery point 455 E Eisenhower Parkway
City Ann Arbor
Administrative area MI
Postal code 48108
Country US

Hours of service 0800 - 1600 (Monday - Friday) EST
Contact instructions
Sanborn Solutions - www.sanborn.com




Process step
When the process occurred 2005-10-18
Description Several coastal areas (mostly islands) which were missing partial or complete data updated. The South Bristol area was one of the fixes.


Process contact
Organization's name (MEDEP) Maine Department of Environmental Protection
Contact's position Senior Database Analyst
Contact's role  processor


Contact information
Phone
Voice (207)287-4292
Fax (207)287-7896

Address
Type postal
Delivery point SHS 17
City Augusta
Administrative area ME
Postal code 04333
Country US





Process step
When the process occurred 2007-01-01
Description A limited amount of hand editing was done in Old Orchard Beach to fix localized errors.


Process contact
Organization's name (MEDEP) Maine Department of Environmental Protection
Contact's position Senior Database Analyst
Contact's role  processor


Contact information
Phone
Voice (207)287-4292
Fax (207)287-7896

Address
Type postal
Delivery point SHS 17
City Augusta
Administrative area ME
Postal code 04333
Country US





Process step
When the process occurred 2008-01-01
Description A limited amount of hand editing was done in Thomaston to fix localized errors.


Process contact
Individual's name GIS Coordinator
Organization's name (MEGIS) Maine Office of Geographic Information Systems
Contact's position GIS Coordinator
Contact's role  processor


Contact information
Phone
Voice 207 624-7700
Fax 207 287-3842

Address
Type postal
Delivery point State House Station 174
City Augusta
Administrative area ME
Postal code 04333-0174
Country US

Hours of service Monday through Friday 0800 - 1700 EST




Source data
Description IMPERV was derived from 5 meter SPOT imagery collected in the summer of 2004 over the State of Maine.


Source medium name  online link
Source citation
Title spot04
Alternate titles  spot04
Publication date 2004-01-01


Presentation formats  digital map
FGDC geospatial presentation format  remote-sensing image


Series
Name Maine GIS
Issue SDE server

Responsible party
Organization's name SPOT Image, Corporation
Contact's role  originator


Responsible party
Organization's name Maine Office of Geographic Information Systems (MEGIS)
Contact's role  publisher


Contact information
Address
Delivery point Augusta ME



Resource location online
Location \\CSU-EIA1PCGIS02\D$\melcd_data\spot5\tifadjust\107690_01.tif



Extent of the source data
Description
ground condition
Temporal extent
Date and time 2004-01-01
Indeterminate time unknown



Distribution 

Distributor
Contact information
Organization's name Maine Office of Geographic Information Systems
Contact's position GIS Coordinator
Contact's role  distributor


Contact information
Phone
Voice 207-624-7700

Address
Type postal
Delivery point State House Station #145
City Augusta
Administrative area Maine
Postal code 04333
Country USA
e-mail addressOIT.Customer-Support@maine.gov

Hours of service 9 am to 5 pm EST
Contact instructions
Monday through Friday




Transfer options
Online source
Locationhttp://megis.maine.gov/catalog/

Fields 

Details for object  IMPERV
 
Definition
value attribute table
Definition source
Environmental Systems Research Institute, Inc. (ESRI)


Overview Description
Entity and Attribute Overview IMPERV pixel values of 0 (zero) indicate an impervious land cover, while pixel values of 1 (one) indicate pervious land cover features.


Entity and Attribute Detail Citation The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.




Metadata Details 

Metadata language English
Metadata character set  utf8 - 8 bit UCS Transfer Format


Scope of the data described by the metadata  dataset


Last update 2005-04-25


ArcGIS metadata properties
Metadata format ArcGIS 1.0
Standard or profile used to edit metadata FGDC


Created in ArcGIS for the item 2013-12-16 10:31:08
Last modified in ArcGIS for the item 2013-12-16 10:52:36



Metadata Contacts 

Metadata contact
Organization's name Sanborn
Contact's position GIS / RS Analyst
Contact's role  point of contact


Contact information
Phone
Voice 734 213-1060
Fax 734 213-1085

Address
Type both
Delivery point 455 E Eisenhower Parkway
City Ann Arbor
Administrative area MI
Postal code 48108
Country US

Hours of service 0800 - 1600 (Monday - Friday) EST
Contact instructions
Sanborn Solutions - www.sanborn.com


Metadata Maintenance 

Maintenance
Update frequency  unknown


Other maintenance requirements Last metadata review date: 20100114


Thumbnail and Enclosures 

Enclosure
Enclosure type  File
Description of enclosure original metadata
Original metadata document, which was translated yes
Source metadata format fgdc

FGDC Metadata (read-only) 

Identification 

Citation
Citation Information
OriginatorMaine Library of Geographic Information (MLGI), Maine Department of Environmental Protection (MEDEP), Maine Department of Inland Fisheries and Wildlife (MEIFW), Maine Department of Transportation (MEDOT), Maine Department of Health and Human Services, Drinking Water Program (MEDHHSDWP) and the Maine State Planning Office (MESPO) with the Maine GIS Executive Council (GISEC), U.S. Geological Survey (USGS), National Oceanographic and Atmospheric Administration (NOAA), Space Imaging (SI), and Sanborn
Publication Date2005-10-18
Title
Impervious areas
Geospatial Data Presentation Formremote-sensing image
Series Information
Series NameMaine GIS
Issue IdentificationSDE server; Internet Data Catalog
Publication Information
Publication PlaceAugusta ME
PublisherMaine Office of Geographic Information Systems (MEGIS)
Other Citation Details
1:24000
Online Linkagehttp://megis.maine.gov/catalog/

Description
Abstract
                            IMPERV is a raster data set of impervious areas, derived from 5 meter SPOT imagery collected in the summer of 2004 over the State of Maine. IMPERV is part of a larger mapping initiative by the State of Maine to quantify land cover (MELCD) at a 5 meter resolution over the entire state. Areas of imperviousness are characterized by anthropogenic features such as buildings, roads, parking lots, etc. Pixel values of 0 (zero) indicate an impervious land cover, while pixel values of 1 (one) indicate pervious land cover features.
                          
Purpose
                            IMPERV quantifies impervious features at a 5 meter spatial resolution over the State of Maine.
                          
Supplemental Information
                            A spread sheet IMPERV5M.xls distributed with IMPERV provides error assessment results based on the stratified random selection of 298, 25m2 validation samples.
                          
Time Period of Content
Time Period Information
Single Date/Time
Calendar Date2005-05-01
Time of DayUnknown
Currentness Reference
                            publication date
                          
Status
ProgressComplete
Maintenance and Update FrequencyNone planned

Spatial Domain
Bounding Coordinates
West Bounding Coordinate-71.166741
East Bounding Coordinate-66.849521
North Bounding Coordinate47.460073
South Bounding Coordinate42.970783

Keywords
Theme
Theme Keywordurbanization
Theme Keywordrunoff
Theme Keywordimpervious area
Theme Keywordland use/land cover
Theme Keywordenvironment
Theme KeywordimageryBaseMapsEarthCover

Place
Place Keyword ThesaurusMaine GIS Thesaurus-Place
Place KeywordMaine
Place KeywordUSA

Stratum
Stratum Keyword ThesaurusGCMD Parameter Keyword
Stratum Keywordland surface
Stratum Keywordradiance or imagery

Access Constraints
                        None
                      
Use Constraints
                        Users must assume responsibility in determining the usability of this data for their purposes. Digital maps retain the accuracy of their source materials. The best use of data mapped at scales of 1:500,000 and 1:250,000 is in statewide planning and studies; at 1:100,000 in regional planning and studies; at 1:62,500 and 1:24,000 in detailed studies and local planning; and at 1:12,000 and 1:5,000 or larger scales in parcel level studies and detailed local planning. In the use of Maine GIS data, please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the correct copy of both data and metadata from the Maine GIS Data Catalog. Updates, corrections, and feedback, incorporated in the Maine GIS database are made in accordance with "Data Standards for Maine Geographic Information Systems", 2002 and coordinated by MEGIS
                      
Point of Contact
Contact Information
Contact Organization Primary
Contact Organization(MEDEP) Maine Department of Environmental Protection
Contact PositionSenior Database Analyst
Contact Address
Address Typemailing address
AddressSHS 17
CityAugusta
State or ProvinceME
Postal Code04333
CountryUNITED STATES

Contact Voice Telephone(207)287-4292
Contact Facsimile Telephone(207)287-7896

Data Set Credit
                        Credit should always be given to the data source and/or originator(s) when the data is transferred or printed.
                      
Security Information
Security ClassificationUnclassified

Native Data Set Environment
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 9.0.0.535; Maine Office of Information Technology (OIT) Oracle 9i, Maine Office of Geographic Information Systems (MEGIS), Maine GIS SDE Maine GIS Internet Data Catalog http://megis.maine.gov/catalog/

Data Quality 

Attribute Accuracy
Attribute Accuracy Report
                            This data set was assessed based on the stratified random selection of 298, 25m2 validation samples. For a map at 90% accuracy using a 95% confidence level, the minimum number of sites required will be 298; with the map being rejected if more than 21 are misclassified. Each validation point was photo-interpreted by an analyst to determine its validation call (impervious or pervious) and to ensure that its entire area was a homogenous cover type. The cover type was determined by examining the SPOT imagery in conjunction with existing DOQQ imagery as further reference. A total of 16 validation points were deemed to be incorrect.
                          
Quantitative Attribute Accuracy Assessment
Attribute Accuracy Value>= 90%
Attribute Accuracy Explanation
                                Sanborn has developed an efficient procedure to assess accuracy of the impervious classification. The desired map accuracy is 90% for a MMU of 0.89 acres. Since we are working with a two-case situation where we only wish to know whether the classification is right or wrong, we can use a binomial distribution to calculate the sample size. Using this assumption, we can use Ginevan (1978) who illustrates a sampling method using stratified random points that satisfies three criteria:


o	the scheme should have a low probability of accepting a map of low accuracy.
o	it should have a high probability of accepting a map of high accuracy.
o	it should require a minimum number of ground truth samples.


Using the look-up table given in the paper that presents the required sample size for a given minimum error and a desired level of confidence, we have determined a specific number of points that are required to meet the accuracy specification. For a map at 90% accuracy using a 95% confidence level (at 95%, we run the risk of a 1 in 20 chance that we reject a map that is actually correct), the minimum number of sites required will be 298; with the map being rejected if more than 21 are misclassified.
                              
Completeness Report
                        Data set is complete for the State of Maine.
                      
Positional Accuracy
Horizontal Positional Accuracy
Horizontal Positional Accuracy Report
                                The SPOT data source for IMPERV specifies a positional (horizontal) accuracy 12 meters or better with 90% confidence.
                              
Quantitative Horizontal Positional Accuracy Assessment
Horizontal Positional Accuracy Value12
Horizontal Positional Accuracy Explanation
                                    Data was derived from digital data that meets or exceeds National Map Accuracy Standards for 1:24,000 scale.
                                  
Lineage
Source Information
Source Citation
Citation Information
OriginatorSPOT Image, Corporation
Publication Date2004
Title
spot04
Geospatial Data Presentation Formremote-sensing image
Series Information
Series NameMaine GIS
Issue IdentificationSDE server
Publication Information
Publication PlaceAugusta ME
PublisherMaine Office of Geographic Information Systems (MEGIS)
Online Linkage\\CSU-EIA1PCGIS02\D$\melcd_data\spot5\tifadjust\107690_01.tif

Type of Source Mediaonline
Source Time Period of Content
Time Period Information
Single Date/Time
Calendar Date2004
Time of DayUnknown
Source Currentness Reference
ground condition
Source Citation Abbreviation
spot04
Source Contribution
                                IMPERV was derived from 5 meter SPOT imagery collected in the summer of 2004 over the State of Maine.
                              
Process Step
Process Description
                                IMPERV was derived from 5 meter SPOT imagery collected in the summer of 2004 over the State of Maine. IMPERV is part of a larger mapping initiative by the State of Maine to quantify land cover at a 5 meter resolution over the entire state.

Areas of imperviousness are characterized by anthropogenic features such as buildings, roads, parking lots, etc. Pixel values of 1 (one) indicate a pervious land cover, while pixel values of 0 (zero) indicate impervious land cover features.
                              
Process Date2005-04-01


Process Contact
Contact Information
Contact Organization Primary
Contact OrganizationSanborn
Contact PositionGIS / RS Analyst
Contact Address
Address Typemailing and physical address
Address455 E Eisenhower Parkway
CityAnn Arbor
State or ProvinceMI
Postal Code48108
CountryUNITED STATES

Contact Voice Telephone734 213-1060
Contact Facsimile Telephone734 213-1085
Hours of Service0800 - 1600 (Monday - Friday) EST
Contact Instructions
                                        Sanborn Solutions - www.sanborn.com
                                      

Process Step
Process Description
                                Several coastal areas (mostly islands) which were missing partial or complete data updated.  The South Bristol area was one of the fixes.
                              
Process Date2005-10-18


Process Contact
Contact Information
Contact Organization Primary
Contact Organization(MEDEP) Maine Department of Environmental Protection
Contact PositionSenior Database Analyst
Contact Address
Address Typemailing address
AddressSHS 17
CityAugusta
State or ProvinceME
Postal Code04333
CountryUNITED STATES

Contact Voice Telephone(207)287-4292
Contact Facsimile Telephone(207)287-7896

Process Step
Process Description
                                A limited amount of hand editing was done in Old Orchard Beach to fix localized errors.
                              
Process Date2007


Process Contact
Contact Information
Contact Organization Primary
Contact Organization(MEDEP) Maine Department of Environmental Protection
Contact PositionSenior Database Analyst
Contact Address
Address Typemailing address
AddressSHS 17
CityAugusta
State or ProvinceME
Postal Code04333
CountryUNITED STATES

Contact Voice Telephone(207)287-4292
Contact Facsimile Telephone(207)287-7896

Process Step
Process Description
                                A limited amount of hand editing was done in Thomaston to fix localized errors.
                              
Process Date2008


Process Contact
Contact Information
Contact Organization Primary
Contact Organization(MEGIS) Maine Office of Geographic Information Systems
Contact PersonGIS Coordinator
Contact PositionGIS Coordinator
Contact Address
Address Typemailing address
AddressState House Station 174
CityAugusta
State or ProvinceME
Postal Code04333-0174
CountryUNITED STATES

Contact Voice Telephone207 624-7700
Contact Facsimile Telephone207 287-3842
Hours of ServiceMonday through Friday 0800 - 1700 EST

Cloud Cover0


Spatial Data Organization 

Direct Spatial Reference MethodRaster


Raster Object Information
Raster Object TypePixel
Row Count99355
Column Count65102

Spatial Reference 

Horizontal Coordinate System Definition
Planar
Grid Coordinate System
Grid Coordinate System NameUniversal Transverse Mercator 1983
Universal Transverse Mercator
UTM Zone Number19
Transverse Mercator
Scale Factor at Central Meridian0.9996
Longitude of Central Meridian-69
Latitude of Projection Origin0
False Easting500000
False Northing0

Planar Coordinate Information
Planar Coordinate Encoding MethodCoordinate Pair
Coordinate Representation
Abscissa Resolution5
Ordinate Resolution5

Geodetic Model
Horizontal Datum NameNorth American Datum of 1983
Ellipsoid NameGeodetic Reference System 80
Semi-major Axis6378137
Denominator of Flattening Ratio298.257

Entities and Attributes 

Detailed Description
Entity Type
Entity Type LabelIMPERV
Entity Type Definition
value attribute table
Entity Type Definition SourceEnvironmental Systems Research Institute, Inc. (ESRI)

Overview Description
Entity and Attribute Overview
                            IMPERV pixel values of 0 (zero) indicate an impervious land cover, while pixel values of 1 (one) indicate pervious land cover features.
                          
Entity and Attribute Detail Citation
                            The  ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt.  In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.
                          

Distribution Information 1 

Distributor
Contact Information
Contact Organization Primary
Contact Organization(MEGIS) Maine Office of Geographic Information Systems
Contact PersonGIS Coordinator
Contact PositionGIS Coordinator
Contact Address
Address Typemailing address
AddressState House Station 174
CityAugusta
State or ProvinceME
Postal Code04333-0174
CountryUNITED STATES

Contact Voice Telephone207 624-7700
Contact Facsimile Telephone207 287-3842
Hours of ServiceMonday through Friday 0800 - 1700 EST

Resource Descriptionhttp://megis.maine.gov/catalog/
Distribution Liability
                        Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.
                      
Standard Order Process
Digital Form
Digital Transfer Information
Format NameESRI Shapefile
Format Version NumberARC Version 9.x
Format Specification
ArcView Shapefile Format
Format Information Content
MEGIS has made all vector layers, in the Maine GIS Internet Data Catalog, available in ESRI's ArcView shapefile format. A shapefile is a simple non-topological format that stores the geometry and attribute information for a set of geographic features as a set of vector (point, line, polygon) coordinates. Shapefiles draw quickly and directly in ArcView, ArcGIS, ArcExplorer. Shapefiles are a compatible data type for many other types of GIS software. Three files are fundamental to each shapefile: .shp stores the feature geometry (shape and location information); .shx stores the index of the feature geometry; .dbf a dBASE (TM) file stores the attribute information for the features. Other index files may be created to help speed analysis and query: these file formats are .sbn .sbx .ain .aix .fbn and .fbx. In addition you may find projection .prj, and metadata .xml, files associated with shapefiles.
File Decompression TechniqueData available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/.

Digital Transfer Option
Online Option
Access Instructions
                                        These data are available to Internet browsers for download from the Maine GIS Internet Data Catalog - http://megis.maine.gov/catalog/


Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/

If you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI) - www.esri.com

See http://megis.maine.gov/links/ for a link to ArcExplorer 9.x .
                                      
FeesData may be downloaded from Maine GIS Internet Data Catalog at no charge.
TurnaroundData is available for immediate download from the Maine GIS Internet Data Catalog.


Technical Prerequisites
If you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI) http://www.esri.com/ You may also see http://megis.maine.gov/links/ for a link to ArcExplorer 9.x


Distribution Information 2 

Distributor
Contact Information
Contact Organization Primary
Contact OrganizationMaine Office of Geographic Information Systems
Contact PositionGIS Coordinator
Contact Address
Address Typemailing address
AddressState House Station 174
CityAugusta
State or ProvinceME
Postal Code04333-0174
CountryUNITED STATES

Contact Voice Telephone(207) 624-7700
Contact Facsimile Telephone(207) 287-3842
Hours of ServiceMonday through Friday 0800 - 1700 EST

Resource DescriptionDownloadable Data
Distribution Liability
                        Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.
                      
Standard Order Process
Digital Form
Digital Transfer Information
Format NameGeoTIFF
Format Specification
Tagged Image File Format
Format Information Content
TIFF image format is in widespread use in the desktop publishing world. It serves as an interface to several scanners and graphic arts packages. TIFF supports black-and-white, grayscale, pseudo color, and true color images, all of which can be stored in a compressed or decompressed format. TIFF images may contain georeferencing information in header tags, or a .tfw file, defined by the GeoTIFF standard. ArcGIS currently supports GeoTIFF tags.
File Decompression TechniqueData available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/

Digital Transfer Option
Online Option
Access Instructions
                                        These data are available to Internet browsers for download from the Maine GIS Internet Data Catalog. Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/software.asp.
                                      
FeesData may be downloaded from Maine GIS Internet Data Catalog at no charge.
TurnaroundData is available for immediate download from the Maine GIS Internet Data Catalog.


Standard Order Process
Available Time Period
Time Period Information
Range of Dates/Times
Beginning Date2004-11-11
Beginning TimeUnknown
Ending DatePresent
Ending TimeUnknown


Distribution Information 3 

Distributor
Contact Information
Contact Organization Primary
Contact OrganizationMaine Office of Geographic Information Systems
Contact PositionGIS Coordinator
Contact Address
Address Typemailing address
AddressState House Station 174
CityAugusta
State or ProvinceME
Postal Code04333-0174
CountryUNITED STATES

Contact Voice Telephone(207) 624-7700
Contact Facsimile Telephone(207) 287-3842
Hours of ServiceMonday through Friday 0800 - 1700 EST

Distribution Liability
                        Users must assume responsibility to determine the usability of this data for their purposes.
                      
Standard Order Process
Digital Form
Digital Transfer Information
Format NameARCSDE
Format Version NumberArcSDE 9.x
Format Information Content
Oracle 9i

Digital Transfer Option
Online Option
Access Instructions
                                        Please contact the Maine Office of GIS (MEGIS) for access instructions.
                                      
FeesAccess is available through Maine's wide area network; WAN users may contact the Maine Office of Information Technology, Maine Office of Geographic Information Systems (MEGIS) for a login.


Metadata Reference 

Metadata Date2005-04-25
Metadata Review Date2010-01-14
Metadata Contact
Contact Information
Contact Organization Primary
Contact OrganizationSanborn
Contact PositionGIS / RS Analyst
Contact Address
Address Typemailing and physical address
Address455 E Eisenhower Parkway
CityAnn Arbor
State or ProvinceMI
Postal Code48108
CountryUNITED STATES

Contact Voice Telephone734 213-1060
Contact Facsimile Telephone734 213-1085
Hours of Service0800 - 1600 (Monday - Friday) EST
Contact Instructions
                                Sanborn Solutions - www.sanborn.com
                              

Metadata Standard NameFGDC Content Standards for Digital Geospatial Metadata
Metadata Standard VersionFGDC-STD-001-1998
Metadata Time Conventionlocal time