Search found 10 matches

by rupeshornl
Tue May 02, 2023 8:24 am America/New_York
Forum: Questions/Comments
Question: white patches in GEDI data
Replies: 3

Re: white patches in GEDI data

Hi @khorramim , ICESat-2 products, such as ATL03/ATL08 , might be suitable for canopy heights. Other data products may fit your requirements: https://search.earthdata.nasa.gov/search?q=canopy%20height
by rupeshornl
Mon May 01, 2023 6:37 pm America/New_York
Forum: Questions/Comments
Question: white patches in GEDI data
Replies: 3

Re: white patches in GEDI data

Hi khorramim , The "white patches" in the gridded GEDI products, such as GEDI L3 canopy height metrics and GEDI L4B aboveground biomass density, are due to there being no good quality GEDI shots within the 1km x 1km grid. As GEDI collects more shots, these grids with no GEDI shots will be ...
by rupeshornl
Thu Apr 20, 2023 1:19 pm America/New_York
Forum: Questions/Comments
Question: Photosynthetically Active Radiation Data
Replies: 5

Re: Photosynthetically Active Radiation Data

@polczynskim, The available data tools and services vary depending on the product. Can you share which product(s) you are interested in?
by rupeshornl
Thu Apr 20, 2023 11:47 am America/New_York
Forum: Questions/Comments
Question: Photosynthetically Active Radiation Data
Replies: 5

Re: Photosynthetically Active Radiation Data

Hi @polczynskim, All PAR data products available are listed here: https://search.earthdata.nasa.gov/search?fs10=Photosynthetically+Active+Radiation&fsm0=Vegetation&fst0=Biosphere

In addition, MCD18A2/MCD18C2 provide daily PAR: https://search.earthdata.nasa.gov/search?q=mcd18
by rupeshornl
Wed Mar 29, 2023 3:40 pm America/New_York
Forum: Questions/Comments
Question: General GEDI question
Replies: 5

Re: General GEDI question

Yes, that's correct. The default quality flags in the `quality_flag` variable might be easier to use.
by rupeshornl
Wed Mar 29, 2023 8:41 am America/New_York
Forum: Questions/Comments
Question: General GEDI question
Replies: 5

Re: General GEDI question

1) A good quality shot has a "sensitivity" range from 0 to 1. A "valid_range" attribute for the "sensitivity" provides these values. GEDI uses a threshold of 0.9 over land and 0.5 over the ocean to compute quality flags. 2) Please refer to the user guide (Table 6) for d...
by rupeshornl
Tue Mar 28, 2023 8:18 am America/New_York
Forum: Questions/Comments
Question: General GEDI question
Replies: 5

Re: General GEDI question

Hi ckhamila , Thank you for posting your questions. 1) GEDI can be used for time series analysis if you find enough footprints in your study plots across time. Now, GEDI has collected billions of shots for more than three years. However, depending on the location of your study area, the density of a...
by rupeshornl
Wed Dec 14, 2022 10:03 am America/New_York
Forum: Questions/Comments
Question: Can't find GEDI L2A data with same coverage as L4A data.
Replies: 3

Re: Can't find GEDI L2A data with same coverage as L4A data.

Hi tomosarliuxiao , The corresponding L2A file for GEDI04_A_2022118231435_O19123_02_T05733_02_003_01_V002 is GEDI02_A_2022118231435_O19123_02_T05733_02_003_02_V002.h5 : L4A: https://search.earthdata.nasa.gov/search/granules?p=C2237824918-ORNL_CLOUD&pg[0][v]=f&pg[0][id]=*2022118231435_O19123_...
by rupeshornl
Thu Jun 16, 2022 11:59 am America/New_York
Forum: Questions/Comments
Question: Automatic 2.25km buffer when .5 or 1 km input
Replies: 1

Re: Automatic 2.25km buffer when .5 or 1 km input

Hi madschony , Thank you for contacting us. The Global Subsets tool only allows setting the x (E-W) and y (N-S) as integers. If you order a subset with x and y as 1km for MOD13Q1, it should result in a subset size of 2.25km x 2.25km with a total of 81 pixels. The 41st pixel (center) will be your 0.2...
by rupeshornl
Fri Apr 08, 2022 9:40 am America/New_York
Forum: Questions/Comments
Question: Broken CMR query for downloading GEDI L4A data
Replies: 3

Re: Broken CMR query for downloading GEDI L4A data

Hi @patkacic, Thank you for noticing the bug, which we have now fixed. Also, the scripts in the Jupyter notebooks are available here, if you like to run them directly from the command line:
https://github.com/ornldaac/gedi_tutorials/tree/main/scripts