Hi,
I have imported some tiles of 1 arcsecond SRTM data into GRASS 6.3 using
r.in.srtm into a lat-long region. Whenever I import them to a UTM
region, res=30, I get aliasing problems. This results in a grid of
lines of jumps in elevation running through my data.
This happens when I use r.proj. I have also tried generating a text
file of UTM coordinates via r.stats -1g, and cs2cs. Importing this as a
raster or vector, and interpolating with r.surf.rst or v.surf.rst also
give aliasing errors.
What is the best way round this? Importing at a higher resolution? How
much higher? My ultimate aim is to compare the SRTM with LiDAR data, so
if possible I would like to use an exact interpolation where possible.
Cheers
John
--
Dr John Stevenson
Postdoctoral Research Associate
School of Earth, Atmospheric and Environmental Sciences
Williamson Building (Room 2.42)
University of Manchester
Manchester M13 9PL, UK
tel. +44(0)161 306 6585; fax. +44(0)161 306 9361;
[EMAIL PROTECTED]
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