Search found 178 matches

by LP DAAC - lien
Mon Nov 27, 2023 3:21 pm America/New_York
Forum: Questions/Comments
Question: GEDI spatial subset order data from EarthData Search gives ECONNREFUSED error
Replies: 5

Re: GEDI spatial subset order data from EarthData Search gives ECONNREFUSED error

Hi,
Have you been able to get the Earthdata Search Tool to work for, not sure why it would say connection denied.
After your search is complete and you order the data there should be a Customize Options you can select to subset your area of interest. Will it allow you to do that?
Thanks,
Brett
by LP DAAC - lien
Fri Nov 24, 2023 1:07 pm America/New_York
Forum: Questions/Comments
Question: Strange coords in metadata in VIIRS collections
Replies: 1

Re: Strange coords in metadata in VIIRS collections

Hi, The Gring coordinates are not wrong, they are exactly what they are supposed to be. Please see the full list of MODIS/VIIRS tile coordinates here: https://modis-land.gsfc.nasa.gov/pdf/sn_gring_10deg.txt Gring (G polygon) coordinates are not the same as the actual tiles coordinates and are not de...
by LP DAAC - lien
Fri Nov 24, 2023 9:53 am America/New_York
Forum: Questions/Comments
Question: MOD13Q1
Replies: 15

Re: MOD13Q1

Hi Joan,
Just following up to make sure you found your data through AppEEARS. Please let us know if it is still not available for you.
Thanks,
Brett
by LP DAAC - lien
Fri Nov 24, 2023 7:00 am America/New_York
Forum: Questions/Comments
Question: Post-processing not available
Replies: 3

Re: Post-processing not available

Hello,
Just checking in to make sure your AppEEARS processing completed?
Thanks,
LPDAAC
by LP DAAC - lien
Thu Nov 16, 2023 12:10 pm America/New_York
Forum: Questions/Comments
Question: Status of VIIRS Version 2 Vegetation Indices processing
Replies: 1

Re: Status of VIIRS Version 2 Vegetation Indices processing

Hello,
Sorry for the delay. We reached out to the data provider, and the VI processing was allowed to be resumed and they are working there way back and through the gaps. They weren't sure on how long this would take, but the gaps should continually be reduced.
Thanks,
Brett
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...