Terraserver.com sat images
Terraserver.com sat images
(OP)
I've been looking at www.terraserver.com 15m/pix resolution photos. What kind of distortion is there at N 37º Lat? Can I find the m/degree latitude for 37-38 N and m/deg longitude and assume the photos are streached in the same proportion? That (I think) gives me 1:1.3 streatch factor. Could that be right?
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com





RE: Terraserver.com sat images
Yup. Gotta' stretch it 1.25 in the N-S direction.
Then it looks like the Googlemap picture too.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Terraserver.com sat images
Anyway. It appears the 1.25 stretch factor is correct, based on the horizontal, vertical and diagonal distances calculated between the map lat/long coordinates using the NOAA server that calculates dist between 2 pts of known lat & long.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Terraserver.com sat images
Now the question is why does Terraserver.com sell distorted photos? Do they take up less space on their servers or something?
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Terraserver.com sat images
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Terraserver.com sat images
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Terraserver.com sat images
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Terraserver.com sat images
I calculated the distances between the map corners myself, and I do not get the same distances using the usda calculator. All this could be the result of an error in the usda great circle calculator,
http://www.wcrl.ars.usda.gov/cec/java/lat-long.htm
although that doesn't explain the apparently misaligned runway plan.
Can anybody suggest a known reliable distance calculator based on the W84 Geoid?
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Terraserver.com sat images
http://www.ga.gov.au/geodesy/datums/calcs.jsp
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Terraserver.com sat images
pleanty of Excels to calculate distances bwtn lat & long.. lo to hi accuracy.
fixed error in my spreadsheet, so distortions are back in the sat photos, at 15 AND 30 m/pix resolutions
round and round...
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Terraserver.com sat images
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com