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WMS
Tags
United States, ground sample distance 2 foot, land surface, color imagery 24-bit, 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 2 foot ground sample distance, map-accurate, continuous digital photographic coverage for Maine communities as identified in the high resolution orthophotography project.
ORTHO_2F is an image mosaic of true color (24-bit), 2 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 2 feet on a side on the ground. Aerial photography for ORTHO_2F was flown at 12,000 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_2F provides a digital photographic map suitable for applications requiring a 1:4800 map scale, a National Map Accuracy Standard (NMAS) of +/- 13.33 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-quadrangle (QQ) sized tiles with a 300m over-edge. All overedges for ORTHO_2f overlap adjacent ORTHO_1F orthophotography by this distance. ORTHO_2F tiles provide complete coverage of the TIER B boundaries as defined by the project, http://www.maine.gov/geolib/orthophotography.htm Tiles split by tier and project boundaries were completed to their full tile extent. Towns designated TIER B will have complete coverage by 2 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) | 1:12,000 |
| Minimum (zoomed out) | 1:24,000 |
Monday through Friday
Digital ortho images in ORTHO_2F were delivered by QQ in uncompressed, untiled, Arc/Info compatible, GeoTIFF format, accompanied by world file *.tfw header files. Other deliverables include FGDC compliant metadata and an orthophoto tile index, INDEX_2F. 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.
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
ground condition
source dates
source dates
Monday through Friday
Monday through Friday
ORTHO_2F is an image mosaic of true color (24-bit), 2 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 2 feet on a side on the ground. Aerial photography for ORTHO_2F was flown at 12,000 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_2F provides a digital photographic map suitable for applications requiring a 1:4800 map scale, a National Map Accuracy Standard (NMAS) of +/- 13.33 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-quadrangle (QQ) sized tiles with a 300m over-edge. All overedges for ORTHO_2f overlap adjacent ORTHO_1F orthophotography by this distance. ORTHO_2F tiles provide complete coverage of the TIER B boundaries as defined by the project, http://www.maine.gov/geolib/orthophotography.htm Tiles split by tier and project boundaries were completed to their full tile extent. Towns designated TIER B will have complete coverage by 2 foot GSD imagery.
To serve Maine GIS users, state and local governments as well as the private sector, supplying 2 foot ground sample distance, map-accurate, continuous digital photographic coverage for Maine communities as identified in the high resolution orthophotography project.
Digital ortho images in ORTHO_2F were delivered by QQ in uncompressed, untiled, Arc/Info compatible, GeoTIFF format, accompanied by world file *.tfw header files. Other deliverables include FGDC compliant metadata and an orthophoto tile index, INDEX_2F. 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.
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_2F represents an entire QQ where applicable.
Complete digital orthorectified image files, covering the aerial photo area for Spring 2003.
Technical standards for ORTHO_2F were consistent with standards established by USGS Cartographic Services Contract CSC2 for high resolution orthophoto production. The 2 foot GSD orthophotographs meet the accuracy standard that 90% of all well-defined features will fall within 13.3 feet of true position on the ground at a mapping scale of 1:4800.
Relative join (misalignment) of transportation features between adjacent image chips/tiles does not exceed 13.3 feet for the 2 foot GSD area.
Aerial photography for ORTHO_2F was flown at 12,000 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 16,794 square miles. The photography was 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.
The Maine Office of GIS and the GeoLibrary Board provide web mapping services to distribute aerial photos and other digital data. A WMS is not a web application which you can see in a web browser; rather, it requires you to add the service to a GIS software application.
http://www.maine.gov/geolib/wms.htm