Ticket #2352 (closed defect: fixed)

Opened 2 months ago

Last modified 1 month ago

Update NOAA Level-1B file format support

Reported by: arb Assigned to: dron
Priority: normal Milestone:
Component: GDAL_Raster Version: unspecified
Severity: normal Keywords: L1B
Cc: dron

Description

The file frmts/l1bdataset.cpp appears to have stagnated and an update is required to support NOAA-18 and MetOp?-A.

NOAA-18 has been around for a few years, as has MetOp?. First, these (and future) satellites need to be recognised. Second, the file format has changed slightly a few times.

It is important to check the file format version number stored in the file since files in both old and new format will exist.

The NOAA KLM Users Guide is the definitive reference. There is an Amendments page which will help you find out what has changed. http://www.ncdc.noaa.gov/oa/pod-guide/ncdc/docs/klm/index.htm

However there a couple of helpful documents available here: http://www.sat.dundee.ac.uk/AVHRR1bFormat.doc http://www.sat.dundee.ac.uk/AVHRR1bDiffs.doc The first may be out of date now but may be easy to read and search. The second is a short description of the main changes made to add support for NOAA-N, NOAA-Nprime and MetOp?. You may want to read this document first. (The documents were obtained from a now-defunct NOAA FTP site) This page may also contain some of the required numbers: http://www.sat.dundee.ac.uk/satids.html

Change History

05/08/08 12:26:40 changed by warmerdam

  • keywords set to L1B.
  • cc set to dron.

I've added Andrey as a cc: as he is the primary author of the L1B driver and may be interested in extending it. I don't anticipate address this myself in the near term.

05/12/08 04:45:13 changed by dron

  • status changed from new to assigned.
  • owner changed from warmerdam to dron.

This is related to ticket #1569.

05/12/08 09:22:30 changed by dron

Andrew,

What about some samples? I need as many samples as possible for every new file type (N, N', METOP). Or point me to the archive where these data are available. SAA archive seems to be not available anymore.

Best regards, Andrey

05/12/08 12:58:38 changed by dron

Nevermind my last comment, I have found something called CLASS that seems to be a replacement for old SAA system. I have ordered few samples. Will see how it works.

Best regards, Andrey

05/13/08 10:01:07 changed by dron

Well, now I have a bunch of samples, but there is another problem: I can't get the mentioned documentation. Dundee site is unavailable; KLM guide is not available also, I can see the table of contents only and getting "page not found" error when trying to read chapters.

Andrew, do you have local copies of these documents that you can send to me by e-mail?

05/14/08 09:39:36 changed by dron

  • status changed from assigned to closed.
  • resolution set to fixed.

Ok, today Dundee site waked up, so I got the docs and added support for the new formats. I only added NOAA-17(N) and METOP-2 variants, because these are only samples I have. I can add more natellites as soon as I will get sample data for testing.

The fix is checked in with r14459.

05/23/08 14:06:29 changed by arb

Thank you for the fixes (although I assume you mean NOAA-18 not NOAA-17 in the previous comment).