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WMS
Tags
United States, land surface, color imagery 24-bit, ground sample distance 1 foot, Maine, radiance or imagery, aerial photograph, ortho-rectified digital image, Gulf of Maine, imageryBaseMapsEarthCover
To serve Maine GIS users, state and local governments as well as the private sector, supplying 1 foot ground sample distance, map-accurate, continuous digital photographic coverage for Maine communities as identified in the high resolution orthophotography project. The seamless presentation is available to Maine GIS users through direct connection to the MEGIS Oracle/ArcSDE database, to anyone with Internet Browser access for viewing through an Internet ArcIMS application at http://megis.maine.gov/maps/ and for free download from the Maine GIS Internet Data Catalog.
ORTHO_1F is an image mosaic of true color (24-bit), 1 foot ground sample distance (GSD) , high resolution digital orthophotographs produced from aerial photos collected over southwestern, central and northeastern Maine in the Spring of 2003, 2004 and 2005. Each pixel represents a planimetric square 1 foot on a side on the ground. Aerial photography for ORTHO_1F was flown at 6,000 feet above mean ground level. Source elevation data were 10 meter Digital Elevation Models produced for this project by USGS from 1:24,000 scale elevation and hydrography data supplied by MEGIS. The digital orthorectified images (image chips) are referenced to North American Datum 1983, UTM Zone 19, expressed in units of meters. Cartographic Services for orthorectification and the creation of digital elevation models were provided by USGS Mid-Continent Mapping Center (USGSMCMC). ORTHO_1F provides a digital photographic map suitable for applications requiring a 1:2400 map scale, a National Map Accuracy Standard (NMAS) of +/- 6.67 feet. The multi-agreement program was developed and funded in coordination with the Maine GeoLibrary Board. The U.S. Department of Agriculture, Natural Resource Conservation Service (NRCS) contributed toward this project via a separate funding agreement with USGS. The completed orthorectified GeoTIFF files represent quarter-quarter-quadrangle (QQQ) sized tiles with a 300m over-edge. All overedges for ORTHO_1F also overlap adjacent ORTHO_HF and ORTHO_2F orthophotography by this distance. ORTHO_1F tiles provide complete coverage of the TIER A boundaries as defined by the project, http://www.maine.gov/geolib/orthophotography.htm. iles split by tier and project boundaries were completed to their full tile extent. Towns designated TIER A will have complete coverage by 1 foot GSD imagery.
Credit should always be given to the data source and/or originator when the data is transferred or printed.
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
There is no extent for this item.
| Maximum (zoomed in) | 1:6,000 |
| Minimum (zoomed out) | 1:24,000 |
Digital ortho images in ORTHO_1F were delivered by QQQ in uncompressed, untiled, Arc/Info compatible, GeoTIFF format, accompanied by world file *.tfw header files. The QQQ are ~400 MB in size. Other deliverables include FGDC compliant metadata and an orthophoto tile index, INDEX_1F. The naming convention of the delivered files was derived from the northwest corner of each ortho tile using the first four digits of the northing and easting coordinates referenced to the UTM coordinate system, followed by the State designator ME, and the UTM Zone number 19. Both ArcExplorer 4.0.1 (free for download from http://www.esri.com/software/arcexplorer/index.html) and the ArcGIS 9.x module ArcMap accept a URL for "adding" data from an Internet location.
Credit should always be given to the data source and/or originator when the data is transferred or printed.
ground condition
Monday through Friday
Users must assume responsibility to determine the usability of this data for their purposes.
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
Steep Falls sample
ground condition
source dates
publication date
Monday through Friday
Monday through Friday
ORTHO_1F is an image mosaic of true color (24-bit), 1 foot ground sample distance (GSD) , high resolution digital orthophotographs produced from aerial photos collected over southwestern, central and northeastern Maine in the Spring of 2003, 2004 and 2005. Each pixel represents a planimetric square 1 foot on a side on the ground. Aerial photography for ORTHO_1F was flown at 6,000 feet above mean ground level. Source elevation data were 10 meter Digital Elevation Models produced for this project by USGS from 1:24,000 scale elevation and hydrography data supplied by MEGIS. The digital orthorectified images (image chips) are referenced to North American Datum 1983, UTM Zone 19, expressed in units of meters. Cartographic Services for orthorectification and the creation of digital elevation models were provided by USGS Mid-Continent Mapping Center (USGSMCMC). ORTHO_1F provides a digital photographic map suitable for applications requiring a 1:2400 map scale, a National Map Accuracy Standard (NMAS) of +/- 6.67 feet. The multi-agreement program was developed and funded in coordination with the Maine GeoLibrary Board. The U.S. Department of Agriculture, Natural Resource Conservation Service (NRCS) contributed toward this project via a separate funding agreement with USGS. The completed orthorectified GeoTIFF files represent quarter-quarter-quadrangle (QQQ) sized tiles with a 300m over-edge. All overedges for ORTHO_1F also overlap adjacent ORTHO_HF and ORTHO_2F orthophotography by this distance. ORTHO_1F tiles provide complete coverage of the TIER A boundaries as defined by the project, http://www.maine.gov/geolib/orthophotography.htm. iles split by tier and project boundaries were completed to their full tile extent. Towns designated TIER A will have complete coverage by 1 foot GSD imagery.
To serve Maine GIS users, state and local governments as well as the private sector, supplying 1 foot ground sample distance, map-accurate, continuous digital photographic coverage for Maine communities as identified in the high resolution orthophotography project. The seamless presentation is available to Maine GIS users through direct connection to the MEGIS Oracle/ArcSDE database, to anyone with Internet Browser access for viewing through an Internet ArcIMS application at http://megis.maine.gov/maps/ and for free download from the Maine GIS Internet Data Catalog.
Digital ortho images in ORTHO_1F were delivered by QQQ in uncompressed, untiled, Arc/Info compatible, GeoTIFF format, accompanied by world file *.tfw header files. The QQQ are ~400 MB in size. Other deliverables include FGDC compliant metadata and an orthophoto tile index, INDEX_1F. The naming convention of the delivered files was derived from the northwest corner of each ortho tile using the first four digits of the northing and easting coordinates referenced to the UTM coordinate system, followed by the State designator ME, and the UTM Zone number 19.
Both ArcExplorer 4.0.1 (free for download from http://www.esri.com/software/arcexplorer/index.html) and the ArcGIS 9.x module ArcMap accept a URL for "adding" data from an Internet location.
ground condition
none
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
Credit should always be given to the data source and/or originator when the data is transferred or printed.
Orthophotos were tonally balanced to produce a uniform contrast and tone across the image tiles of the entire
project.
Area of each orthophoto in ORTHO_1F represents an entire QQQ where applicable.
Complete digital orthorectified image files, covering the aerial photo area for Spring 2003.
Technical standards for ORTHO_1F were consistent with standards established by USGS Cartographic Services Contract CSC2 for high resolution orthophoto production. The 1 foot GSD orthophotographs meet the accuracy standard that 90% of all well-defined features will fall within 6.67 feet of true position on the ground at a mapping scale of 1:2400.
Relative join (misalignment) of transportation features between adjacent image chips/tiles does not exceed 6.67 feet for the 1 foot GSD area.
Standard government DEMs were utilized.
Aerial photography for ORTHO_1F was flown at 6,000 feet above mean ground level. Camera focal length was six (6") inches. Natural color aerial photography flown north-south, controlled by Airborne Global Positioning System (GPS) and Inertial Measurement Unit (IMU) was acquired and processed to a positive image over an area of approximately 4,493 square miles. The photography acquired only under conditions free from clouds and cloud shadows, smoke, haze, light streaks, snow, flooding, excessive soil moisture, during minimal shadow conditions, and with sun angle greater than 30%. The film specified was Kodak 2427 (or equivalent AGFA) POSITIVE original film, processed to a positive image. Adequate stereo coverage over the project area was required with a minimum overlap of 60% forward and 30% side. The USGS National Aerial Photography Program office, part of USGS Eastern Region Geography conducted quality assessment of the photos collected.
Orthorectification from color positive aerial film, including geometric correction and mosaicking processes, performed by trained personnel, operating a computerized processing chain.
Users must assume responsibility to determine the usability of this data for their purposes.
This metadata document contains embedded URLs that can be used to make OGC WMS 1.1.1 compliant map requests of the framework layers in the Maine GeoLibrary.
http://www.maine.gov/geolib/wms.htm