Photo scenery projection help...

[Guest player1]

My image was from as far as I can tell "NAD83 New York State Plane Coordinate System UTM Zone 18"I can reproject this from my GIS to WGS84, Do I also change to Geological LatLon or use UTM/WGS84.I am very confused by all the options in the GIS, I did a reprojection using GeoLatLon/WGS84 and the result was a slite image rotation (good) but it also squished the image way too much so something wrong.Also PS is limitted to image size smaller than 30000x30000 ??? I have 2 GIGs memory and permanant 3 gig swap file for doing large work and have turned off any "undo" commands but 30000x30000 is still the limit.???Thanks for any suggestions

[rhumbaflappy 113]

The squishing is quite normal for reprojected UTM files.Dick

[scott967 62]

Note that "New York State Plane Coordinate System" and "UTM Zone 18 (north)" are two different projections. Actually, NY state has 4 different sets of SPCS projection parameters, 3 are transverse mercator and 1 (Long Island) is Lambert conformal. http://forums.avsim.net/user_files/160404.jpgSo your first step is to look at the meta data and determine which projection is for your file.For our purposes, NAD83 and WGS84 datums are identical (that is, lat/long expressed in either are the same) so what you need to do is apply the appropriate projection conversion to "geographic". When data in geographic "projection" are displayed on a flat paper/screen, it is normal for areas to be distorted, due to the difference between angular units in geo and linear units (XY) on screen, increasing towards the poles.scott s..

[Guest player1]

Thanks Dick and Scott,I'll give it a go.

[Guest player1]

Would the UTM data be prefered or better than the NYS Plane?Thanks again.