Anyone had success with importing this data format?
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Anyone had success with importing this data format?
[nit pick: AVHRR is an instrument, not a data format; which format is
your data in?]
Yes, I've done it. Not for a while so I won't give exact instructions,
but I don't remember it being a problem.
Use r.in.gdal:
http://www.remotesensing.org/gdal/frmt_l1b.html
or failing that you might try r.in.bin.
I seem to recall a connection to the new gdalwarp thin-plate-spline
warping tool for better support for this sort of sequential line
satellite data. (Markus?)
If you figure it out, it would be a useful thing to post to the list so
that others searching the archive can find the instructions.
Hamish
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well,
i had partially success importing directly .lac
data...but gdal imported it as unsigned, without any
coordinate information...i tried r.in.bin and didn't
work
samuel
--- Jeremy Stocks <stocksll33@yahoo.co.uk> escreveu:
Anyone had success with importing this data format?
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On Fri, Aug 26, 2005 at 11:21:35PM +0200, Jeremy Stocks wrote:
Anyone had success with importing this data format?
Yes. You have to preprocess them with 'gdalwarp' to apply
the GCPs. I highly recommend GDAL 1.3.0 for this.
Then r.in.gdal and the AVHRR data should be well imported.
Note that the precision depends on the NOAA satellite
number:
http://www.gdal.org/frmt_l1b.html
From NOAA-15 onwards the geocoding precision is much better.
Markus
On Sat, Aug 27, 2005 at 01:19:13AM -0700, Hamish wrote:
> Anyone had success with importing this data format?
[nit pick: AVHRR is an instrument, not a data format; which format is
your data in?]Yes, I've done it. Not for a while so I won't give exact instructions,
but I don't remember it being a problem.Use r.in.gdal:
http://www.remotesensing.org/gdal/frmt_l1b.htmlor failing that you might try r.in.bin.
I seem to recall a connection to the new gdalwarp thin-plate-spline
warping tool for better support for this sort of sequential line
satellite data. (Markus?)If you figure it out, it would be a useful thing to post to the list so
that others searching the archive can find the instructions.
Here we are (yes, the new gdalwarp thin-plate-spline warping tool is needed):
# warp AVHRR L1B to Erdas/Img - LatLong/WGS84
# <4326> +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs <>
# apply GCPs with thin plate spline transformer
FILE=my_avhrr
gdalwarp -tps -of HFA -t_srs "EPSG:4326" -co COMPRESS=YES $FILE $FILE.img
#Then use in a LatLong/WGS84 location:
r.in.gdal $FILE.img $FILE
Markus