Maciej Tomaszczyk wrote:
I have problem with MOLA data, i managed to import MOLA binary file
to grass using r.in.bin
but some cells seems to have invalid values (see pictures in
attachment). Anyone know how to solve this problem??? and set
correct elevation values. Thanks in advance
Laurent wrote:
It seems that your file contains negative values. They are coded with
the values form 32768 to 65535 with 32765 meaning -32768 and 65535
meaning -1 (you can see in your histogram that you have values in the
low value (0…) which are the positive values and in the high values
(…65535) which are the negative values (-1…).
Maciej wrote:
There is in r.in.bin a -s flag(high bit means negative value) but when
i used it, effect was the same. The r.mapcalc fixed it. Now everything
is ok. Thanks for your advice
Glad it is working. FYI in an article in GRASSNews vol 1 (page 11) I use
this r.in.bin command to load in MOLA data:
GRASS:~ > r.in.bin input=megt90n000fb.img
title=“MGS/MOLA Gridded Data, 1/32 degree”
output=mars_mola_32 -b bytes=2 rows=5760
cols=11520 n=90N s=90S e=180E w=180W
Hamish
Hi
The problem is that i act on your article in GRASSnews vol.1.
I did it again one more time and effect is the same.
maybe there is a bug in r.in.bin??? i use latest cvs version,
(i tried both, command line and GUI).
maciej
Maciej Tomaszczyk
Polish Geological Institute
Geological Mapping Department