Search found 9 matches

by rapsodia86
Thu Jun 30, 2022 9:59 am America/New_York
Forum: Questions/Comments
Question: Problems understanding MODIS LAI values
Replies: 1

Re: Problems understanding MODIS LAI values

Because LAI product is 8bit data type, values are from 0-255. Table 4 of the user guide you provided a link to, says that:
valid range is 0-100, fill values are 249-255, and multiply by scale factor=0.1.
So, mask/filter out values above 100 and multiply by 0.1.
Screenshot 2022-06-30 095645.png
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by rapsodia86
Thu May 26, 2022 10:03 am America/New_York
Forum: Questions/Comments
Question: Cloud mask
Replies: 3

Re: Cloud mask

Here is the example of using quality filtering in python from LPDAAC tutorial: https://lpdaac.usgs.gov/resources/e-learning/working-daily-nasa-viirs-surface-reflectance-data/ Also, see if you can use a LPDAAC toolbox: https://git.earthdata.nasa.gov/projects/LPDUR/repos/arcgis-modis-viirs-python-tool...
by rapsodia86
Mon May 23, 2022 11:52 am America/New_York
Forum: Questions/Comments
Question: I wonder the meaning of reference pixel
Replies: 7

Re: I wonder the meaning of reference pixel

From: https://seadas.gsfc.nasa.gov/help-7.5.2/visat/Reprojection.html#crsParameters under "GUI: Output Parameters": "Easting This is the distance away from the origin (x component) to place the reference pixel. This essentially has the effect of shifting the geographic boundaries of y...
by rapsodia86
Mon May 23, 2022 10:41 am America/New_York
Forum: Questions/Comments
Question: I wonder the meaning of reference pixel
Replies: 7

Re: I wonder the meaning of reference pixel

Here is a software description and the guideline:
https://seadas.gsfc.nasa.gov/help-7.5.2/visat/Reprojection.html#crsParameters
"GUI: Output Parameters" section has a detailed explanation.
by rapsodia86
Fri May 20, 2022 5:41 pm America/New_York
Forum: Questions/Comments
Question: HLS data Bulk Download
Replies: 1

Re: HLS data Bulk Download

It takes some time to download (depends on your connection). Did it show you "Finished downloading (..)"? See the attachment.
by rapsodia86
Fri May 20, 2022 5:15 pm America/New_York
Forum: Questions/Comments
Question: MODIS metadata download
Replies: 2

Re: MODIS metadata download

If you are interested in the metadata records of your search, https://earthexplorer.usgs.gov/ allows you to export your results to different formats as: *.kmz, *.txt, *.csv, etc. with details about each record. MODIS data are under: NASA LPDAAC Collections. For MOD09A1v61, I got: Local Granule ID En...
by rapsodia86
Thu May 19, 2022 4:52 pm America/New_York
Forum: Questions/Comments
Question: MODIS LAI scale factor in AppEEARS
Replies: 3

Re: MODIS LAI scale factor in AppEEARS

After the order is completed, open README file. For point extraction it says: "## 3. Point Sample Extraction Process Datasets available in AppEEARS are served via OPeNDAP (Open-source Project for a Network Data Access Protocol) services. OPeNDAP services allow users to concisely pull pixel valu...
by rapsodia86
Wed Apr 13, 2022 12:08 pm America/New_York
Forum: Questions/Comments
Question: Missing MOD11A2.061 tiles from 2001
Replies: 5

Missing MOD11A2.061 tiles from 2001

Hello, I would like to inform that there are missing tiles from 2001 MOD11A2 v061. See e.g. https://e4ftl01.cr.usgs.gov/MOLT/MOD11A2.061/2001.09.22/ Those data are available for v006 (https://e4ftl01.cr.usgs.gov/MOLT/MOD11A2.006/2001.09.22/). It would be good to verify whole 2001 v061 processing his...