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Re: Newbie to satellite data and IDL [message #47567]

Wed, 15 February 2006 23:49

peter.albert@gmx.de is currently offline

peter.albert@gmx.de
Messages: 108
Registered: July 2005

Senior Member

Hi Alex,

if your AVHRR data happens to come in HDF5, you might want to try our
little READ_HDF() routine found at http://wew.met.fu-berlin.de/idl/. It
can possibly help you understanding how to deal with HDF files in IDL.
Furthermore, if your data is still in satellite projection (or any
other different from plain lat/lon), you need some routines for
properly plotting the data onto a map. The starting point here would be
Liam Gumley's IMAGEMAP routine. On the above website you'll find a
modified (object-oriented) version, MAP_IMAGE__DEFINE. Above all, it
adds the option to subsequently add multiple overpasses into one plot.

Assuming you had a AVHRR HDF file with three datasets, "lon", "lat" and
"sst", the code fragment for creating the first image would read like

lon = read_hdf(avhrr_filename, "/lon")
lat = read_hdf(avhrr_filename, "/lat")
sst = read_hdf(avhrr_filename, "/sst")
m = obj_new("map_image", sst, lat, lon, /rainbow)
obj_destroy, m

Cheers,

Peter

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[Message index]

		Re: Newbie to satellite data and IDL By: peter.albert@gmx.de on Wed, 15 February 2006 23:49
		Re: Newbie to satellite data and IDL By: David Fanning on Wed, 15 February 2006 11:58
		Re: Newbie to satellite data and IDL By: alex922@gmail.com on Wed, 15 February 2006 11:48
		Re: Newbie to satellite data and IDL By: David Fanning on Wed, 15 February 2006 10:04

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