modis_GEO.py processing failure

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yammh
Posts: 2
Joined: Mon Sep 25, 2023 9:22 pm America/New_York
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modis_GEO.py processing failure

by yammh » Mon Sep 25, 2023 9:42 pm America/New_York

I am having a issue processing modis geolocation. There has been a problem processing terra data since September 20th. The Internet is operating normally.
Please advise.

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[guest@modis temp]$ modis_GEO.py -o MOD03.2023.0925.1201.terra-1.1_1.230925121058.hdf --disable-download -d --ancdb=./ancdb -v --log 2023.0925.1201.terra-1.1_1.230925121058.level1a.hdf Determining required attitude and ephemeris files...

Input file: 2023.0925.1201.terra-1.1_1.230925121058.level1a.hdf
Sensor : modist
Start time: 2023268120119
End time : 2023268120947

Cannot create geolocation from 2023.0925.1201.terra-1.1_1.230925121058.level1a.hdf; exiting.
Error! could not establish a network connection. Check your network connection.
If you do not find a problem, please try again later.
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sidsaini445
Posts: 6
Joined: Tue Jan 09, 2024 2:16 am America/New_York
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Re: modis_GEO.py processing failure

by sidsaini445 » Tue Jan 09, 2024 9:55 am America/New_York

It seems there was an issue accessing or downloading the required auxiliary attitude and ephemeris data needed by the modis_GEO.py tool to process the MODIS geolocation.

A few things to try:

Check your network connection and make sure you have access to the internet and the URLs used to fetch the auxiliary data. The error indicates it failed to establish a network connection.

Try running modis_GEO.py again with the "--verbose" option to get more detailed output on what URLs it is trying to access. See if those specific servers/files are accessible.

Use the "--ancdb" option to point modis_GEO.py to a local directory containing the attitude/ephemeris data instead of downloading it. You may need to manually obtain these files for the given date range.

There could have been a temporary issue on 9/20 with the servers hosting the auxiliary data. Trying a different date may work if the network itself is okay.

If the network itself seems fine, it's likely an issue with the availability of the specific attitude/ephemeris files on 9/20. Providing modis_GEO.py access to those files locally through "--ancdb" should allow the geolocation process to complete.

Let me know if the additional troubleshooting details help resolve the problem or if you have any other questions!

Sid saini
Last edited by ASDC - David W. on Tue Jan 09, 2024 2:11 pm America/New_York, edited 1 time in total.
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