Search found 143 matches

by LP DAAC - lien
Thu Nov 09, 2023 5:08 pm America/New_York
Forum: Questions/Comments
Question: Gedi Tree height question
Replies: 1

Re: Gedi Tree height question

It is the highest value of the L1B data, and how that is done is described in the Level-2A ATBD. Section 4.3.4 details how the canopy top (highest detected return) is found. Section 4.3.6 details how the ground (lowest detected mode) is found. Section 5 details how these waveform ranging points (in ...
by LP DAAC - lien
Thu Nov 09, 2023 5:07 pm America/New_York
Forum: Questions/Comments
Question: Gedi Tree height question
Replies: 1

Gedi Tree height question

I want to consult a GEDI worker about some GEDI data processing problems, and hope to get the help of the GEDI staff. I would like to know whether the tree height obtained through waveform decomposition is the average height within 25 meters of the light spot size or the highest value of the GEDI L1...
by LP DAAC - lien
Tue Nov 07, 2023 12:59 pm America/New_York
Forum: Questions/Comments
Question: MODIS to VIIRS transition
Replies: 4

Re: MODIS to VIIRS transition

Hi, You are correct, that is the main premise on the how they produce the 8-day composite. They choose the best available from all 8 daily products. However, I think where the issue may be is that they do not use the QA layer to determine which daily acquisition they chose for the 8-day product. The...
by LP DAAC - lien
Tue Nov 07, 2023 11:44 am America/New_York
Forum: Questions/Comments
Question: IS there a L2 Product of EMIT Data useful for ocean plankton detection
Replies: 1

Re: IS there a L2 Product of EMIT Data useful for ocean plankton detection

Hello,
Sorry, but there is not any EMIT data processes over water or for water.
Thanks,
Brett
by LP DAAC - lien
Fri Nov 03, 2023 12:08 pm America/New_York
Forum: Questions/Comments
Question: How to calculate NDVI from MODIS MOD09GQ?
Replies: 4

Re: How to calculate NDVI from MODIS MOD09GQ?

Hello, First, please see Table 8 in the MOD09 User Guide, this is the bit index: https://lpdaac.usgs.gov/documents/925/MOD09_User_Guide_V61.pdf Bit 0-1 are the Modland QA bits and are probably the most important for your purpose. Pixels with a value of 00 in the 0-1 bits are considered very good qua...
by LP DAAC - lien
Fri Nov 03, 2023 9:49 am America/New_York
Forum: Questions/Comments
Question: georeference of ECO2LSTE v001
Replies: 4

Re: georeference of ECO2LSTE v001

Hi, It is not unusual to have more QA files then data files. Because the AppEEARS uses the Geolocation files in itzs search, so it will bring back the QAs for any file that intersects with your AOI. However, not every file will have all the different data products produced from it, but it will have ...
by LP DAAC - lien
Thu Nov 02, 2023 7:05 am America/New_York
Forum: Questions/Comments
Question: georeference of ECO2LSTE v001
Replies: 4

Re: georeference of ECO2LSTE v001

Hello, It can be somewhat problematic to work with without it being georectified. Could you take a look at our AppEEARS tool: https://appeears.earthdatacloud.nasa.gov AppEEARS makes data like Ecostress so uch easier to work with. You can subset, project and reformat just to name a few and you do not...
by LP DAAC - lien
Tue Oct 31, 2023 11:24 am America/New_York
Forum: Questions/Comments
Question: Missing VJ109H1 scenes in Earthdata cloud
Replies: 12

Re: Missing VJ109H1 scenes in Earthdata cloud

Hello Piyush,
Can you give it a try now? The data was reprocessed and for a while there were both the new and old version in the CMR, now those have been cleaned up. Thanks for your patience.
Brett
by LP DAAC - lien
Mon Oct 30, 2023 3:52 pm America/New_York
Forum: Questions/Comments
Question: Is MOD44B v061 available in a STAC?
Replies: 6

Re: Is MOD44B v061 available in a STAC?

Hi, Sorry for all the confusion with this. Recently with the new version and switch to the cloud things have bee changing rather quickly. Please notice you will not find any MODIS v061 with in the LPDAAC_ECS (https://cmr.earthdata.nasa.gov/stac/LPDAAC_ECS/collections/MOD44B.v061). In order to find t...
by LP DAAC - lien
Mon Oct 30, 2023 2:07 pm America/New_York
Forum: Questions/Comments
Question: Inquiry about MODIS Data Time Stamps
Replies: 1

Re: Inquiry about MODIS Data Time Stamps

Hi Hadis, As you know we were discussing this through the lpdaac@usgs.gov email. So I will just post the answer the below for the user community. Thanks, Brett I am sorry, but there is not really a way to get that accurate of a time. For each pixel you will be able to get hourly average UTC of when ...