problem in processing of MODIS L1A file to MODIS GEO file

[ivgbhavani]

I wanted to generate MODIS L1B file using below mentioned L1A file(A2017358085500.L1A_LAC),
while processing from MODIS L1A file to MODIS GEO file,I am getting error. How can I solve this ?
can anyone help in this.

$ modis_GEO.py A2017358085500.L1A_LAC -v
Determining required attitude and ephemeris files...

Input file: A2017358085500.L1A_LAC
Sensor    : modisa
Start time: 2017358085500
End time  : 2017358085959

Cannot create geolocation from A2017358085500.L1A_LAC; exiting.
Error! could not establish a network connection. Check your network connection.
If you do not find a problem, please try again later.

[gfireman]

You need attitude and ephemeris files to generate a valid geolocation file.
If those are not specified, modis_GEO.py will call modis_atteph.py, which will try the following:
- look in a local database (defaults to $OCVARROOT/ancillary_data.db)
- query our database (for which you need a network connection)
The routine will then download the appropriate files, if not already present.

If your connection is shaky, just retry until it works.
Or you can schedule modis_atteph.py to query our database and download atteph files during times of known good connection.
In this case the call would be:
modis_atteph.py A2017358085500.L1A_LAC


[ivgbhavani]

Thank you for your reply..
I have given below command.. Than i got following
$modis_atteph.py A2017001083500.L1A_LAC -v
Aqua
Searching database: /home/bhavani/SEADAS74/ocssw/var/ancillary_data.db
Determining pass start and end times...
Aqua

Input file: A2017001083500.L1A_LAC
Sensor    : aqua
Start time: 2017001083500
End time  : 2017001083959

Error! could not establish a network connection. Check your network connection.
If you do not find a problem, please try again later.

[zhigang]

Dear Gwyn,

I also have this problem in modis_GEO.py. The details of error was:
root@vultr:~# modis_GEO.py A2018144055000.L1A_LAC
Traceback (most recent call last):
  File "/root/ocssw/scripts/modis_GEO.py", line 187, in <module>
    sys.exit(main())
  File "/root/ocssw/scripts/modis_GEO.py", line 173, in main
    modis_env(m)
  File "/root/ocssw/scripts/modules/modis_utils.py", line 264, in modis_env
    self.start, self.stop, self.sat_name = modis_timestamp(self.file)
  File "/root/ocssw/scripts/modules/modis_utils.py", line 151, in modis_timestamp
    sat_name = meta['ASSOCIATEDPLATFORMSHORTNAME'].lower()
TypeError: 'NoneType' object has no attribute '__getitem__'

My ocssw was v7.5, and I tried again after updateing ocssw, but it didn't work. Further, using the modis_atteph.py A2018144055000.L1A_LAC was also failed, the error was:
ERROR: For A2018143050500.L1A_LAC could not determine:  start time, start date, stoptime, stop date. Exiting.

What is the cause of this ?

Best Regards,
Zhigang

[gfireman]

Zhigang -

Try: ls -l A2018144055000.L1A_LAC; file A2018144055000.L1A_LAC

Mine looks like
-rw-rw-r-- 1 gfireman gfireman 571397213 2018-05-24 03:28 A2018144055000.L1A_LAC
A2018144055000.L1A_LAC: Hierarchical Data Format (version 4) data

If yours doesn't look like that, you might have to download again.

[gfireman]

Bhavani -

Do you have a network connection?

Try this from the command line:
curl https://oceandata.sci.gsfc.nasa.gov/Ancillary/?format=json

You should get:
{"rows":[["Aquarius\/","-","-"],["Attitude-Ephemeris\/","-","-"],["LUTs\/","-","-"],["OISST\/","-","-"],["Meteorological\/","-","-"]]}