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Hi Norman,

I found the issue. I have to change this line:

echo "P5\n7732 7733\n65535"|cat - nak.dat>$i.16bit.log.pgm

Into this:

echo $'P5\n7732 7733\n65535'|cat - nak.dat>$i.16bit.log.pgm

Now I got some black images but I think this is due coordinates.

Norman, here is the output:

~ # ls -l rhos_645_q.16bit.log.pgm
-rw-r--r-- 1 jvaldez jvaldez 154730541 Sep 24 16:37 rhos_645_q.16bit.log.pgm
~ # head -1 rhos_645_q.16bit.log.pgm
P5\n8862 8730\n65535

Both commands are showing the same error:~ # display rhos_555_q.16bit.log.pgm display: negative or zero image size `rhos_555_q.16bit.log.pgm' @ error/pnm.c/ReadPNMImage/434.~ # identify rhos_555_q.16bit.log.pgm identify: negative or zero image size `rhos_555_q.16bit.log.pgm' @ error/pnm.c/Re...

Thanks Norman. I'm following your steps as shown on post but I'm stuck at convert. I'm getting the following error:convert: negative or zero image size `rhos_645_q.16bit.log.pgm' @ error/pnm.c/ReadPNMImage/434.convert: negative or zero image size `rhos_555_q.16bit.log.pgm' @ erro...

Hi, I have been using l1mapgen to produce some Aqua/Terra MODIS RGB from L1b level with 250 m resolution but I'm getting some wierd results.Red arrows marking wierd artifacts This is the command used:l1mapgen ifile=A2018227192500.L1B_LAC geofile=A2018227192500.GEO resolution=250 ofile=A201822719...