Search found 193 matches

by LP DAAC - lien
Tue Mar 12, 2024 11:53 am America/New_York
Forum: Home
Question: MCD19A1
Replies: 5

Re: MCD19A1

Hello, Sorry for the delay. We wanted to get confirmation about this from the PI/Developer of the MAIAC product because Band 4, 11, and 12 fall with in the green wavelength. He did confirm what we suspected, it is Band 4 that is aligned with the MCD19A2 optical_depth_550. Please let us know if you h...
by LP DAAC - lien
Tue Mar 12, 2024 11:46 am America/New_York
Forum: Home
Question: MODIS cloud remove
Replies: 6

Re: MODIS cloud remove

Hi Zhou,
It is recommended to use the Cloud State, as that is more definitive. Also, It contains, cloud mask from MOD35 and cloud/snow/aerosol/fire/shadow etc as determined by the reflectance algorithm. Hence users are encouraged to use the state flag from the MOD09GA.
Thanks,
Brett
by LP DAAC - lien
Tue Mar 12, 2024 10:38 am America/New_York
Forum: Home
Question: Unable to download certain GEDI L1B granules
Replies: 4

Re: Unable to download certain GEDI L1B granules

Hi Q, Please remove the spaces and the quotation marks and I think it will work, with one condition. I discovered that Earthdata will only allow 5 granules at a time to be searched this way. When I put the entire list in it gave me this error: Error retrieving granules The query contained [26] condi...
by LP DAAC - lien
Tue Mar 12, 2024 10:13 am America/New_York
Forum: Home
Question: Download script for MODIS/Terra LST Daily 1km has different download URLS from collection granules shown
Replies: 4

Re: Download script for MODIS/Terra LST Daily 1km has different download URLS from collection granules shown

Hi, Can I point you in a little different direction. We have seen this issue with the Earthdata Search before when users try to subset. We are the LPDAAC, so the data comes from us, but the Earthdata Search is out of our control. Can you try our AppEEARS tool: https://appeears.earthdatacloud.nasa.go...
by LP DAAC - lien
Fri Mar 08, 2024 11:38 am America/New_York
Forum: Home
Question: MCD15A3H
Replies: 6

Re: MCD15A3H

Hi, LAI_Charts_China.PNG I processed February 1 through June 30 from 2012-2023 in our AppEEARS tool and they seem consistent, so at least there is no dramatic spike or drop from year to year, but the highest value I see is 2.3. The vast majority are between 0.5 and 1.5, so the issue is should they b...
by LP DAAC - lien
Thu Mar 07, 2024 2:47 pm America/New_York
Forum: Home
Question: Download script for MODIS/Terra LST Daily 1km has different download URLS from collection granules shown
Replies: 4

Re: Download script for MODIS/Terra LST Daily 1km has different download URLS from collection granules shown

Hello,
Could you send the search parameters you are using and also copy and paste the script? We would like to emulate exactly what what you are doing.
Thanks,
Brett
by LP DAAC - lien
Wed Mar 06, 2024 10:55 am America/New_York
Forum: Home
Question: MCD15A3H
Replies: 6

Re: MCD15A3H

Hello,
Could you give me some specific examples. Like the H/V Lat/long range and date, then we could look at specific examples. Also, did you get a chance to look at the QC bits to see if those would indicate what may be wrong with the pixels?
Thanks,
Brett
by LP DAAC - lien
Mon Mar 04, 2024 3:56 pm America/New_York
Forum: Home
Question: How should pixel values greater than 10,000 or less than 0 in MOD09GA data be handled?
Replies: 6

Re: How should pixel values greater than 10,000 or less than 0 in MOD09GA data be handled?

Hi Zhou,
Yes, that is what I would suggest, treating them like fill value. Certainly don't use those particular pixels for scientific research.
Thanks,
Brett
by LP DAAC - lien
Mon Mar 04, 2024 9:40 am America/New_York
Forum: Home
Question: How should pixel values greater than 10,000 or less than 0 in MOD09GA data be handled?
Replies: 6

Re: How should pixel values greater than 10,000 or less than 0 in MOD09GA data be handled?

Hi, Yes, this is somewhat common especially in daily data, practically every tile has some of these outliers. They should not be used, they are erroneous data. Please see the statement below which gives more specifics on why this is the case: The "anomalies" that you've identified, e.g. ne...
by LP DAAC - lien
Fri Mar 01, 2024 9:37 am America/New_York
Forum: Home
Question: MODIS MOD09A1 v6.1 invalid QC codes?
Replies: 6

Re: MODIS MOD09A1 v6.1 invalid QC codes?

Thanks for the tile info Hawthorne. I have found those values in many random files since you brought that to our attention. We have contacted the folks at LDOPE who help develop the products and also specialize in the QC. As soon as we hear back from them I will let you know. Thanks for your patienc...