Large shift in a MOD09GQ image

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earthengine_urs
Posts: 39
Joined: Mon Jan 27, 2020 10:36 am America/New_York

Large shift in a MOD09GQ image

by earthengine_urs » Thu Dec 23, 2021 2:11 pm America/New_York

For the 2010_07_01 MOD09GQ image, in both v6 and v61, there is a large shift relative to the basemap around 39.5E 57.8N

See screenshot where the river Volga on the basemap is shifted relative to the image.

Earth Engine link: https://code.earthengine.google.com/bd0 ... bf3562d41b

Thanks,
Simon
gq_shift.png
gq_shift.png (76 KiB) Not viewed yet

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lien
Posts: 42
Joined: Thu Jun 25, 2020 9:51 am America/New_York

Re: Large shift in a MOD09GQ image

by lien » Tue Jan 04, 2022 2:55 pm America/New_York

Hi,
Do you have the granule ID(s) of the tiles involved? Did you get the data from the Earthengine or from the LPDAAC: https://e4ftl01.cr.usgs.gov/MOLT/MOD09G ... 010.07.01/
Thanks,
Brett

earthengine_urs
Posts: 39
Joined: Mon Jan 27, 2020 10:36 am America/New_York

Re: Large shift in a MOD09GQ image

by earthengine_urs » Wed Jan 12, 2022 10:48 pm America/New_York

Brett - the granule is /namespace/gestalt/modis/MOD09GQ.006/2010.07.01/MOD09GQ.A2010182.h20v03.006.2015208185542.hdf, taken from LP DAAC

lien
Posts: 42
Joined: Thu Jun 25, 2020 9:51 am America/New_York

Re: Large shift in a MOD09GQ image

by lien » Fri Jan 14, 2022 8:38 am America/New_York

Hi Simon,
Can you give me the Lat/Long of the area of the Volga River the picture represents? I would like to look at several MOD09GQ tiles for that area to see if they differ from one another. Did you notice that all MODIS tiles from that H/V were offset or just that one. If they are all offset with the earthengine image I would suspect the projection and datum are different then it really isn't an issue. Do you know the projection and datum of the Earthengine image, if it is different from the MODIS Sinusoidal, a shift would be somewhat normal?
Thanks,
Brett

earthengine_urs
Posts: 39
Joined: Mon Jan 27, 2020 10:36 am America/New_York

Re: Large shift in a MOD09GQ image

by earthengine_urs » Fri Jan 21, 2022 6:54 pm America/New_York

Brett,

The location is 39.502 N 57.8569 E . The projection is MODIS sinusoidal.

Images on other dates don't have this problem.

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