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ImageryBaseMapsEarthCover
Use in GIS for viewing and analysis along with sale to surveying, engineering, GIS and other intersted individuals and companies.
This OGC-compliant web mapping service (WMS) provides 6" pixel resolution orthoimagery of the central coastal Maine towns from Saco to Bath. This WMS is provided by the Maine Office of GIS and the Maine GeoLibrary Board. As the prime contractor, Bradstreet Consultants, Inc. used the aerial photography flown in two sessions on April 21st and 26th, 2006, by Richard Crouse & Associates, Inc. of Frederick, MD who acquired approximately 1335 photos @ 1"=600' with airborne GPS using a Wild RC-30 (#13261) aerial camera. Bradstreet Consultants, Inc. painted and repainted ground targets for photo survey control points (~200) to support full analytical aerotriangulation. The aerotriangulation solution was used to set up each stereopair of photos for orthorectification and DTM compilation. The ortho imagery was created by scanning (14 microns (um) per pixel or 1815 dpi) the original 1"=600' scale film and employing a digital terrain model (DTM) from updating some town's original DTM and some town's from scratch using the 1"=600' scale negatives or diapositives using both analytical and softcopy (digital) stereoplotter in the Kork KDMS format.
Data Set Produced by Bradstreet Consultants, Inc., 69 Peters Road, Searsmont, ME04973 www.bradstreet.com
Data should not be used beyond the scale of 1:2400.
Extent
There is no extent for this item.
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:50,000 |
Data Set Produced by Bradstreet Consultants, Inc., 69 Peters Road, Searsmont, ME04973 www.bradstreet.com
ground condition
These services have been successfully tested in ArcGIS, MapInfo, Google Earth, QGIS, gvSIG, Gaia and uDig.
Data should not be used beyond the scale of 1:2400.
ground condition
This OGC-compliant web mapping service (WMS) provides 6" pixel resolution orthoimagery of the central coastal Maine towns from Saco to Bath. This WMS is provided by the Maine Office of GIS and the Maine GeoLibrary Board. As the prime contractor, Bradstreet Consultants, Inc. used the aerial photography flown in two sessions on April 21st and 26th, 2006, by Richard Crouse & Associates, Inc. of Frederick, MD who acquired approximately 1335 photos @ 1"=600' with airborne GPS using a Wild RC-30 (#13261) aerial camera. Bradstreet Consultants, Inc. painted and repainted ground targets for photo survey control points (~200) to support full analytical aerotriangulation. The aerotriangulation solution was used to set up each stereopair of photos for orthorectification and DTM compilation. The ortho imagery was created by scanning (14 microns (um) per pixel or 1815 dpi) the original 1"=600' scale film and employing a digital terrain model (DTM) from updating some town's original DTM and some town's from scratch using the 1"=600' scale negatives or diapositives using both analytical and softcopy (digital) stereoplotter in the Kork KDMS format.
Use in GIS for viewing and analysis along with sale to surveying, engineering, GIS and other intersted individuals and companies.
ground condition
none
Data should not be used beyond the scale of 1:2400.
Data Set Produced by Bradstreet Consultants, Inc., 69 Peters Road, Searsmont, ME04973 www.bradstreet.com
Orthoimagery for Portland, Maine clipped to within about 100 feet beyond the town line.
Horizontal_Positional_Accuracy_Report: Gound control used in aerotriangulation solution accurate to within 0.1 ft. Said solution was used to compile 1:1200 vector base mapping, which was subsequently used to control the orthorectification process. Vector data was compiled to meet ASPRS Class 1 accuracy standards. The orthorectification process was applied to the imagery and those features which are at ground level. No attempt was made to correctly rectify elevated structures as part of this project.
Comparison to Source
Gound control used in aerotriangulation solution accurate to within 0.1 ft. Said solution was used to compile terrain data to support generation of 2 foot contour data. This elevation data was subsequently used to control the orthorectification process. The elevation data was compiled to meet ASPRS Class 1 accuracy standards. The orthorectification process was applied to the imagery and those features which are at ground level. No attempt was made to correctly rectify elevated structures as part of this project.
Bradstreet Consultants, Inc. used the aerial photography flown in two sessions on April 21st and 26th, 2006, by Richard Crouse & Associates, Inc. of Frederick, MD who acquired approximately 1335 photos @ 1"=600' with airborne GPS using a Wild RC-30 (#13261) aerial camera. Bradstreet Consultants, Inc. painted and repainted ground targets for photo survey control points (~200) to support full analytical aerotriangulation. The aerotriangulation solution was used to set up each stereopair of photos for orthorectification and DTM compilation. The ortho imagery was created by scanning (14 microns (um) per pixel or 1815 dpi) the original 1"=600' scale film and employing a digital terrain model (DTM) from updating some town's original DTM and some town's from scratch using the 1"=600' scale negatives or diapositives using both analytical and softcopy (digital) stereoplotter in the Kork KDMS format.
These services have been successfully tested in ArcGIS, MapInfo, Google Earth, QGIS, gvSIG, Gaia and uDig.
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.