Hi folks,
tatel@euskalnet.net said:
Unfortunatelly I can't register SRTM and image data. After
reprojecting image from UTM-WGS84 to Lat_Lon-WGS84, it seems to be a
shift of about 250-300 meters towards W in SRTM from image. More
confusingly, this
I've also seen a shift of about 200 meters between MrSid-format
DOQQs and the corresponding USGS DRG files. The MrSid files were decoded
using the Windows version of mrsiddecode, which produces a tiff and a
tfw file. There were actually two oddities in the tfw files. Here's
a quote from an earlier message I posted to the list about this problem:
bryan@ayesha.phys.Virginia.EDU said:
Two oddities with the tfw files, though: the fourth line of the file
(cell size) ended up being a positive number, which r.in.tiff didn't
like. Adding a minus sign fixed the problem. I also found that the
last line of the file (northing) was offset by 200 meters relative to
the USGS topo maps I'm using. These may just be problems with the
original sid/sdw files I happened to be using.
Since then I've heard from a couple of other people who've
noticed the same thing.