HLS 2.0 granules for almost any December day are missing

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truf
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HLS 2.0 granules for almost any December day are missing

by truf » Fri May 17, 2024 3:17 pm America/New_York

Hi,

I've fetched all granules since 2018 (in fact just their overiews) from the HLS2.0 dataset for a specific tile_id and found out that the amount of data dramatically differs from month to month. Especially for december.
Consider tile_id 39UUV and following commands:

wget https://github.com/nasa/HLS-Data-Resources/raw/main/bash/hls-bulk-download/getHLS.sh
chmod +x ./getHLS.sh
echo "39UUV" > /tmp/tiles

./getHLS.sh /tmp/tiles 2018-12-01 2018-12-31 /tmp/results
./getHLS.sh /tmp/tiles 2019-12-01 2019-12-31 /tmp/results
./getHLS.sh /tmp/tiles 2020-12-01 2020-12-31 /tmp/results
./getHLS.sh /tmp/tiles 2021-12-01 2021-12-31 /tmp/results
./getHLS.sh /tmp/tiles 2022-12-01 2022-12-31 /tmp/results
./getHLS.sh /tmp/tiles 2023-12-01 2023-12-31 /tmp/results
./getHLS.sh /tmp/tiles 2024-12-01 2024-12-31 /tmp/results

The output is:

granules to download
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
Downloading into /tmp/results/S30/2018/39/U/U/V/HLS.S30.T39UUV.2018335T080259.v2.0
Finished downloading into /tmp/results/S30/2018/39/U/U/V/HLS.S30.T39UUV.2018335T080259.v2.0
1 granules to download
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
Downloading into /tmp/results/S30/2019/39/U/U/V/HLS.S30.T39UUV.2019338T081311.v2.0
Finished downloading into /tmp/results/S30/2019/39/U/U/V/HLS.S30.T39UUV.2019338T081311.v2.0
1 granules to download
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
Downloading into /tmp/results/S30/2020/39/U/U/V/HLS.S30.T39UUV.2020338T081319.v2.0
Finished downloading into /tmp/results/S30/2020/39/U/U/V/HLS.S30.T39UUV.2020338T081319.v2.0
0 granules to download
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
1 granules to download
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
Downloading into /tmp/results/S30/2022/39/U/U/V/HLS.S30.T39UUV.2022337T081219.v2.0
Finished downloading into /tmp/results/S30/2022/39/U/U/V/HLS.S30.T39UUV.2022337T081219.v2.0
0 granules to download
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
0 granules to download
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value

So only 4 granules are available. 1 per 2018, 2019, 2020 and 2022.

There are at least 10 times more data for this tile_id for other months.
I guess this isn't the only tile that lacks december data.
Any ideas whats wrong with it?

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LP DAAC - dgolon
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Re: HLS 2.0 granules for almost any December day are missing

by LP DAAC - dgolon » Mon May 20, 2024 10:21 am America/New_York

Hi @truf Thanks for writing in. I'm having our developer of that script take a look to see what is going on. I'll report back when we have more information. Thanks --Danielle
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truf
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Re: HLS 2.0 granules for almost any December day are missing

by truf » Tue Jun 04, 2024 2:05 am America/New_York

Hi!
Have you go any news re this problem? I don't sure it's a script issue, perhaps it's a db problem.

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Re: HLS 2.0 granules for almost any December day are missing

by mitchbon » Wed Jun 05, 2024 9:14 am America/New_York

Is this a higher latitude area? Landsat and Sentinel-2 image collection decreases significantly during the winter (esp. December/January) in higher latitude areas. For example, above ~50N you will find very few (if any) images during those months (at least in Canada).

I assume this is due to lower sunlight conditions during this period.

kristianbodolai
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Re: HLS 2.0 granules for almost any December day are missing

by kristianbodolai » Wed Jun 05, 2024 10:58 am America/New_York

Hi all, I'm having a very similar issue in a ~equator area, missing tiles from the STAC collection for december 2020. Code to reproduce it follows:

[code]
import pystac_client
hls_collections = ["HLSS30.v2.0"]
cmr_catalog = pystac_client.Client.open("https://cmr.earthdata.nasa.gov/stac/LPCLOUD/")

cmr_items = cmr_catalog.search(collections=hls_collections, bbox=[35, -1.5, 39,-0.5],datetime='2020-12-21').item_collection()
[/code]

This returns only 2 items, where a similar search in the copernicus dataspace returns 4.

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