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WMS
Tags
aerial photograph, imageryBaseMapsEarthCover, radiance or imagery, Maine
These data were the base imagery for the MELCD 2004 project. They were merged with LandSat TM data to create sharpened multispectral data for landcover mapping.
These data are panchromatic satellite data from the French SPOT-5 satellite. They represent a black-and-white "picture" of Earth from the satellite using 5-meter pixels (5m x 5m squares) as the minimum unit for imaging. The collection dates are mostly during the leaf-on season in 2004. Two scenes are from winter collects and snow/ice can be seen. This dataset was created through orthorectification of SPOT imagery using USGS Digital Orthophoto Quadrangles and Maine DEMs in ERDAS OrthoBASE 8.7. The orthorectified imagery was then warped using Space Imaging's proprietary Autowarp software. Autowarp computes tie points between two images based on correlation between similar points in the images and then applies a locally varying warp based on the tiepoints. The program was given an initial set of ground control points to create a coarse quadratic warp which was then refined through the addition of more points selected by the program. This work was done by Space Imaging and Sanborn staff. Certain high-elevation areas were further orthorectified by i-cubed to reduce horizontal error. Color balancing for the mosaic was done using GIMP image processing software by Maine DEP GIS staff. Note that balancing was done to enhance vegetated areas. In most cases, this means loss of contrast in urban areas. The raw data are much darker, but would provide more detail in urban areas than these processed data (at the expense of loss of contrast in vegetated areas). These data are part of the MELCD 2004 landcover and impervious mapping project for Maine. The data are LICENSED to the following entities: -Federal Government organizations when working with Maine on joint projects -All State Government departments and agencies within Maine -Regional county and local governments within Maine -K-12 schools, State Colleges and Universities within Maine
SPOT Image, Corporation, Space Imaging, Sanborn, State of Maine.
Access is limited to the licensees as stated above.
Extent
There is no extent for this item.
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
SPOT Image, Corporation, Space Imaging, Sanborn, State of Maine.
ground condition
Users must assume responsibility to determine the usability of this data for their purposes.
Access is limited to the licensees as stated above.
Access is limited to the licensees as stated above.
Sanborn Solutions - www.sanborn.com
These data are panchromatic satellite data from the French SPOT-5 satellite. They represent a black-and-white "picture" of Earth from the satellite using 5-meter pixels (5m x 5m squares) as the minimum unit for imaging. The collection dates are mostly during the leaf-on season in 2004. Two scenes are from winter collects and snow/ice can be seen. This dataset was created through orthorectification of SPOT imagery using USGS Digital Orthophoto Quadrangles and Maine DEMs in ERDAS OrthoBASE 8.7. The orthorectified imagery was then warped using Space Imaging's proprietary Autowarp software. Autowarp computes tie points between two images based on correlation between similar points in the images and then applies a locally varying warp based on the tiepoints. The program was given an initial set of ground control points to create a coarse quadratic warp which was then refined through the addition of more points selected by the program. This work was done by Space Imaging and Sanborn staff. Certain high-elevation areas were further orthorectified by i-cubed to reduce horizontal error. Color balancing for the mosaic was done using GIMP image processing software by Maine DEP GIS staff. Note that balancing was done to enhance vegetated areas. In most cases, this means loss of contrast in urban areas. The raw data are much darker, but would provide more detail in urban areas than these processed data (at the expense of loss of contrast in vegetated areas). These data are part of the MELCD 2004 landcover and impervious mapping project for Maine. The data are LICENSED to the following entities: -Federal Government organizations when working with Maine on joint projects -All State Government departments and agencies within Maine -Regional county and local governments within Maine -K-12 schools, State Colleges and Universities within Maine
These data were the base imagery for the MELCD 2004 project. They were merged with LandSat TM data to create sharpened multispectral data for landcover mapping.
ground condition
Access is limited to the licensees as stated above.
Access is limited to the licensees as stated above.
SPOT Image, Corporation, Space Imaging, Sanborn, State of Maine.
No attributes involved.
The Root Mean Square (RMS) error reflects the error in georectification of the SPOT scene to USGS Digital Orthophoto Quadrangles (DOQ) using a second order polynomial model. The USGS DOQs have a horizontal positional accuracy of 6 meters.
The RMS error was computed in ERDAS Imagine software using about 300 tiepoints spread across the geographic extent of the scene. These points were a subset of the total number of tiepoints selected by Autowarp.
SPOT-5 data collected by satellite and compiled by SPOT Satellite Corp. Data then shipped to Space Imaging and State of Maine staff for inspection and approval.
Space Imaging/Sanborn staff used ERDAS OrthoBASE 8.7 and Space Imaging's Autowarp software to orthorectify the imagery to existing USGS DOQs using an initial set of ground control points to create a coarse quadratic warp, which was then refined through the addition of more points.
Sanborn Solutions - www.sanborn.com
Certain high-elevation areas were still not acceptable, and were sent out to i-cubed for further orthorectification.
Images were manipulated for tonal balance across scenes, and clipped to the mosaic pattern provided by Sanborn, using GIMP 2.2 and ESRI's ArcInfo (GRID) software.
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