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Major problem · 08-23-2012, 08:38 PM

I believe that the folks stating that it's aerial photography are correct. Aerial mapping is done on behalf of the states for their various GIS programs.

The results are in the public domain and available for free to those with the software to use, display and manipulate it.

For NH see http://www.granit.unh.edu/

For best results, the photography is generally done in the spring with minimal tree cover and more favorable lighting angles.

Google Maps/Earth, Microsoft, and many other Geographical Info Systems (GIS) providers use this calibrated photo data but often don't provide the date that each photo frame was taken. Your best detailed information will be obtained from each state's GIS public data system.

Alot of imagery is available from government research satellites that provides infrared and radar results for habitat studies but are less likely to show you enjoying your hot tub.

I've been fascinated with this field of study for a long time. The software and hardware can be a little pricey at the advanced stages but is accessable for any serious backcountry traveler. For land management organizations it's an absolute must.

08-23-2012, 08:38 PM	#8
Major problem Senior Member Join Date: Nov 2004 Location: Brockton,Ma, N Conway & Guilford,NH Posts: 53 Thanks: 24 Thanked 7 Times in 6 Posts	I believe that the folks stating that it's aerial photography are correct. Aerial mapping is done on behalf of the states for their various GIS programs. The results are in the public domain and available for free to those with the software to use, display and manipulate it. For NH see http://www.granit.unh.edu/ For best results, the photography is generally done in the spring with minimal tree cover and more favorable lighting angles. Google Maps/Earth, Microsoft, and many other Geographical Info Systems (GIS) providers use this calibrated photo data but often don't provide the date that each photo frame was taken. Your best detailed information will be obtained from each state's GIS public data system. Alot of imagery is available from government research satellites that provides infrared and radar results for habitat studies but are less likely to show you enjoying your hot tub. I've been fascinated with this field of study for a long time. The software and hardware can be a little pricey at the advanced stages but is accessable for any serious backcountry traveler. For land management organizations it's an absolute must.