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FWTools Projection Trouble

T

tobrien54

Messages
11
Country
unitedstates
I downloaded a UTM/NAD83 tiff image from the USGS server. In trying to reproject to WGS84 with FWTools I may have run into a snag but I'm too new with the process to tell. When viewed the resulting image is elongated and appears somewhat distorted from the original, although I haven't tried to resample yet.

I've tried two ways:
gdalwarp -of GTiff -co "INTERLEAVE=PIXEL" -s_srs "+proj=utm +zone=16N +datum=nad83" -t_srs "+proj=latlong +datum=WGS84" -r cubic 05454920.tif 05454920_WGS84.tif
Click to expand...

Using the images info:
gdalwarp -of GTiff -co "INTERLEAVE=PIXEL" -t_srs "+proj=latlong +datum=WGS84" -r cubic 05454920.tif 05454920_WGS84.tif
Click to expand...

Both with the same results. Did I miss a step?
 
Hi,

I don't think you did anything wrong. When you reproject the image it will indeed get a bit distorted (that's the whole point of it). And often you also see that the width and height changes a bit.

Sometimes I use the -ts option of gdalwarp to specify the output width and height. That way you can force it to stay closer to the size of the input image.
 
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