Search found 10 matches
- 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
- 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 ...
- 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?
- 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
In addition, MCD18A2/MCD18C2 provide daily PAR: https://search.earthdata.nasa.gov/search?q=mcd18
- 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.
- 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...
- 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...
- 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_...
- 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...
- 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
https://github.com/ornldaac/gedi_tutorials/tree/main/scripts