I have a doubt about GDAL reprojection.
I use “gdalwarp” utility to reproject an image in a specific projection system (for example WGS84 UTM49).
“gdalinfo” on original image displays this corner coordinate:
Lower Right ( 123.0220110, -54.6797900) (123d 1’19.24″E, 54d40’47.24″S)
and projected image in UTM49:
Lower Right ( 1845275.980,-6159877.836) (131d34′ 2.85″E, 53d48′ 4.36″S)
I suppose that degrees (131d34′ 2.85″E, 53d48′ 4.36″S) are degrees coordinates of the pixel in lower right in the projected image, different from the originals.
I read about “gdaltransform” utility that it reprojects coordinates from one system to another, but running this:
$ gdaltransform -s_srs EPSG:32649 -t_srs EPSG:4326
1845275.980 -6159877.836
(when 1845275.980 -6159877.836 are projected coordinates in utm49)
it displays geographic coordinate not in original image ( 123.0220110, -54.6797900), but in the projected image(131.56745835871 -53.8012102381326).
From this result I suppose that gdaltransform doesn’t reprojects from one system to another, but it simply “translates” coordinates.
Is that affirmation correct?
