Sentinel 2 L2A: Add band assets for lower spatial res versions #88
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jonas-eberle
reviewed
Apr 8, 2021
| if asset_res == BANDS_TO_RESOLUTIONS[band_id][0]: | ||
| asset_key = band_id | ||
| else: | ||
| asset_key = f'{band_id}_{asset_res}m' | ||
| asset = pystac.Asset(href=asset_href, | ||
| media_type=asset_media_type, | ||
| title=band.description, |
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Thanks @lossyrob for your work. Does it make sense to include the spatial resolution in the asset title?
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Done.
Also set the gsd correctly - gsd is based on the sensor, not spatial resolution, so that is set the same across all band assets.
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gsd is based on the sensor, not spatial resolution, so that is set the same across all band assets.
Can you clarify this? There are no examples in the PR so it's hard to tell what the implication is without trying to follow all the code. Do you mean that the asset named B03_60m would have a res of 10 instead of 60?
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I've got the same question @kylebarron but wasn't quite grokking what was going on here. For the purposes of STAC, gsd is the same as what might be referred to as resolution
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Ah wait, now I see, you are referring to the actual downsampled assets. B03 is a 10m band, but they provide 20m and 60m versions.
I personally don't see the reason for storing these downsampled files, especially with the STAC tools being developed.
But, even in the case of downsampled imagery I'd say the gsd should also change to indicate the pixel size in the asset, since for all purposes that's the effective resolution of that asset. It also clearly distinguishes it from the regular asset object.
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@matthewhanson I thought the same thing about the gsd, but https://github.com/radiantearth/stac-spec/blob/master/item-spec/common-metadata.md#gsd states that the value of this field should be related to the spatial resolution at the sensor, rather than the pixel size of images after orthorectification, pansharpening, or scaling.
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maybe it's time to add resampling_factor to the common specs ;-)
As @kylebarron mentioned, having a GSD of 10 for band that are 20m resolution fully respect the spec but is not really user friendly. I would tend to argue that since there is already the proj extension, maybe just don't add the GSD field which might be confusing for users.
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@kylebarron yep, here's a sample item: |
Codecov Report
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- Misses 357 358 +1
Continue to review full report at Codecov.
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"assets": {
"B02_20m": {
"gsd": 10,I don't know the STAC spec perfectly, so you might be right this conforms to the spec, but I'm 👎 on this because it would make it harder for clients to interpret the Item and choose which asset to use. Asset names can be anything, so a client can't parse those directly. If all the |
I agree with you. It is confusing when the original sensor resolution is mentioned in the asset and not the spatial resolution of the asset itself. If it is clear in the STAC item specification that it is just the sensor resolution, then I would suggest skipping that property here, since the resolution is still available via the transform property. |
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Thanks for the review folks. I agree that the gsd not matching the resolution is confusing. A couple ways forward here are A. to change the spec, and then to update the values here with the GSD which matches the raster spatial resolution and not the sensor value, or B. drop GSD from the asset properties where the spatial resolution doesn't match the sensor ground sample distance. It seems like B is a workaround that ends up choosing not to encapsulate valid information, which makes me suspect of the value of the property itself as defined in the spec - are people are looking at gsd as the raster spatial resolution, and not interested in the sensor gsd, and because gsd is in "common metadata" it's in practice overloaded for spatial resolution effectively? I think this is worth an issue against the 1.0 RC for the STAC spec, as it's in common metadata and if is causing confusion/being used differently then we should figure out how best to use that property. |
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See the stac-spec issue on this: radiantearth/stac-spec#1096 Ok, we just discussed this when pushing on an rc.3 release and here's what we concluded:
We think, as Best Practice, gsd should not be included on assets. But the question still remains, if you do include it on an asset what does it mean? My originally intention with gsd when it was in the EO extension was to have it be the resolution in the file, even if it has been resampled, and I would lean toward that still because I think that's what the majority of folks would expect it to be when looking at the metadata. |
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Thanks @matthewhanson. While it's true the resolution is on the proj transform, it might be a bit harder to parse out for folks, which made the gsd more attractive. Also if the projection doesn't match a distance unit, there wouldn't be a sense of the spatial resolution in meters. It also seems like valuable enough information to put per-asset that some instances are baking in the meter resolution into the asset keys, as I'm doing here.... I'm not too attached to gsd on assets though, so taking the guidance it seems like the work left on this PR is to add the gsd of 10m onto the Item properties and removing gsd from all assets. |
For the web, in my opinion, |
Ah, that's a fair point - indeed I was thinking you may have a good reason why just proj:transform wouldn't work. I'm convinced we should have 'something' here then. I see two options:
I don't love the first option, having to know the context of it to understand exactly what it means. Matt pointed out that our The second might be interesting, indeed the gsd definition in STAC points to an alternate value - if there was a 'resolution' field Planet could use it to say 3.125, and then have a gsd of 3.7. Thoughts? Second option seems good to me, but I'm probably missing something obvious... |
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Ok, we discussed this extensively on the call today. The tl;dr conclusion is to go with option 2), with a new field called raster:spatial_resolution in the new raster extension. We'll keep the main gsd definition, and recommend that people not use it at the asset level unless it is actually describing a sensor with a different resolution - aster is one that may make sense to do this for. And raster:spatial_resolution should be used for any upsampling / downsampling of information. There was debate on if it should be actual pixel sizes, in an array, for times when those might be different. But the conclusion was use the proj extension for that, and this should be a single value in meters, representing the meters per pixel the raster was processed to. So this should be as easy to use as the gsd field. So for the example that this issue started with, we would just replace raster:spatial_resolution for gsd at the asset level, using the 20m and 60m values for the downsampled ones. It could also include the gsd, which would be 10m for all of them (but doing that is optional, since that would be captured at the properties level as well). |
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Instead of waiting for the spatial_resolution in the raster extension, I think this should be good to go with the last change I pushed up, which removes GSD from assets in which the spatial_resolution does not match the GSD. Latest Item example{
"type": "Feature",
"stac_version": "1.0.0-beta.2",
"id": "S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE",
"properties": {
"providers": [
{
"name": "ESA",
"roles": [
"producer",
"processor",
"licensor"
],
"url": "https://earth.esa.int/web/guest/home"
}
],
"platform": "Sentinel-2B",
"constellation": "Sentinel 2",
"instruments": [
"msi"
],
"eo:cloud_cover": 0.447807,
"sat:orbit_state": "descending",
"sat:relative_orbit": 81,
"proj:epsg": 32722,
"s2:product_uri": "S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE",
"s2:generation_time": "2021-01-22T15:55:00.000000Z",
"s2:processing_baseline": "02.14",
"s2:product_type": "S2MSI2A",
"s2:datatake_id": "GS2B_20210122T133229_020270_N02.14",
"s2:datatake_type": "INS-NOBS",
"s2:datastrip_id": "S2B_OPER_MSI_L2A_DS_VGS2_20210122T155500_S20210122T133224_N02.14",
"s2:granule_id": "S2B_OPER_MSI_L2A_TL_VGS2_20210122T155500_A020270_T22HBD_N02.14",
"s2:mgrs_tile": "22HBD",
"s2:reflectance_conversion_factor": 1.03305092950356,
"s2:degraded_msi_data_percentage": 0.0,
"s2:nodata_pixel_percentage": 0.913129,
"s2:saturated_defective_pixel_percentage": 0.0,
"s2:dark_features_percentage": 0.0,
"s2:cloud_shadow_percentage": 0.0,
"s2:vegetation_percentage": 3e-05,
"s2:not_vegetated_percentage": 0.0,
"s2:water_percentage": 99.552161,
"s2:unclassified_percentage": 0.0,
"s2:medium_proba_clouds_percentage": 0.308523,
"s2:high_proba_clouds_percentage": 0.137727,
"s2:thin_sirrus_percentage": 0.001557,
"s2:snow_ice_percentage": 0.0,
"s2:mean_solar_zenith": 32.3712311857264,
"s2:mean_solar_azimuth": 64.9495240978383,
"datetime": "2021-01-22T13:32:29.024000Z"
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
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],
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},
"links": [
{
"rel": "license",
"href": "https://sentinel.esa.int/documents/247904/690755/Sentinel_Data_Legal_Notice"
},
{
"rel": "self",
"href": "/opt/src/s2-item.json",
"type": "application/json"
}
],
"assets": {
"safe-manifest": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/manifest.safe",
"type": "application/xml",
"roles": [
"metadata"
]
},
"product-metadata": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/./MTD_MSIL2A.xml",
"type": "application/xml",
"roles": [
"metadata"
]
},
"granule-metadata": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/./GRANULE/L2A_T22HBD_A020270_20210122T133224/MTD_TL.xml",
"type": "application/xml",
"roles": [
"metadata"
]
},
"inspire-metadata": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/./INSPIRE.xml",
"type": "application/xml",
"roles": [
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]
},
"datastrip-metadata": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/./DATASTRIP/DS_VGS2_20210122T155500_S20210122T133224/MTD_DS.xml",
"type": "application/xml",
"roles": [
"metadata"
]
},
"B02": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R10m/T22HBD_20210122T133229_B02_10m.jp2",
"type": "image/jp2",
"title": "Band 2 - Blue - 10m",
"eo:bands": [
{
"name": "B02",
"common_name": "blue",
"description": "Band 2 - Blue",
"center_wavelength": 0.49,
"full_width_half_max": 0.098
}
],
"gsd": 10,
"proj:shape": [
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10980
],
"proj:bbox": [
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"roles": [
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},
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"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R10m/T22HBD_20210122T133229_B03_10m.jp2",
"type": "image/jp2",
"title": "Band 3 - Green - 10m",
"eo:bands": [
{
"name": "B03",
"common_name": "green",
"description": "Band 3 - Green",
"center_wavelength": 0.56,
"full_width_half_max": 0.045
}
],
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"roles": [
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]
},
"B04": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R10m/T22HBD_20210122T133229_B04_10m.jp2",
"type": "image/jp2",
"title": "Band 4 - Red - 10m",
"eo:bands": [
{
"name": "B04",
"common_name": "red",
"description": "Band 4 - Red",
"center_wavelength": 0.665,
"full_width_half_max": 0.038
}
],
"gsd": 10,
"proj:shape": [
10980,
10980
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"proj:bbox": [
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"roles": [
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},
"B08": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R10m/T22HBD_20210122T133229_B08_10m.jp2",
"type": "image/jp2",
"title": "Band 8 - NIR - 10m",
"eo:bands": [
{
"name": "B08",
"common_name": "nir",
"description": "Band 8 - NIR",
"center_wavelength": 0.842,
"full_width_half_max": 0.145
}
],
"gsd": 10,
"proj:shape": [
10980,
10980
],
"proj:bbox": [
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0.0,
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"roles": [
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},
"visual-10m": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R10m/T22HBD_20210122T133229_TCI_10m.jp2",
"type": "image/jp2",
"title": "True color image",
"eo:bands": [
{
"name": "B04",
"common_name": "red",
"description": "Band 4 - Red",
"center_wavelength": 0.665,
"full_width_half_max": 0.038
},
{
"name": "B03",
"common_name": "green",
"description": "Band 3 - Green",
"center_wavelength": 0.56,
"full_width_half_max": 0.045
},
{
"name": "B02",
"common_name": "blue",
"description": "Band 2 - Blue",
"center_wavelength": 0.49,
"full_width_half_max": 0.098
}
],
"gsd": null,
"proj:shape": [
10980,
10980
],
"proj:bbox": [
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"roles": [
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]
},
"AOT-10m": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R10m/T22HBD_20210122T133229_AOT_10m.jp2",
"type": "image/jp2",
"title": "Aerosol optical thickness (AOT)",
"gsd": null,
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},
"WVP-10m": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R10m/T22HBD_20210122T133229_WVP_10m.jp2",
"type": "image/jp2",
"title": "Water vapour (WVP)",
"gsd": null,
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"roles": [
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},
"B02_20m": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R20m/T22HBD_20210122T133229_B02_20m.jp2",
"type": "image/jp2",
"title": "Band 2 - Blue - 20m",
"eo:bands": [
{
"name": "B02",
"common_name": "blue",
"description": "Band 2 - Blue",
"center_wavelength": 0.49,
"full_width_half_max": 0.098
}
],
"gsd": 10,
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],
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},
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"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R20m/T22HBD_20210122T133229_B03_20m.jp2",
"type": "image/jp2",
"title": "Band 3 - Green - 20m",
"eo:bands": [
{
"name": "B03",
"common_name": "green",
"description": "Band 3 - Green",
"center_wavelength": 0.56,
"full_width_half_max": 0.045
}
],
"gsd": 10,
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},
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"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R20m/T22HBD_20210122T133229_B04_20m.jp2",
"type": "image/jp2",
"title": "Band 4 - Red - 20m",
"eo:bands": [
{
"name": "B04",
"common_name": "red",
"description": "Band 4 - Red",
"center_wavelength": 0.665,
"full_width_half_max": 0.038
}
],
"gsd": 10,
"proj:shape": [
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5490
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},
"B05": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R20m/T22HBD_20210122T133229_B05_20m.jp2",
"type": "image/jp2",
"title": "Band 5 - Vegetation red edge 1 - 20m",
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{
"name": "B05",
"common_name": "rededge",
"description": "Band 5 - Vegetation red edge 1",
"center_wavelength": 0.704,
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}
],
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},
"WVP-60m": {
"href": "/opt/src/tests/data-files/sentinel2/esa_S2B_MSIL2A_20210122T133229_N0214_R081_T22HBD_20210122T155500.SAFE/GRANULE/L2A_T22HBD_A020270_20210122T133224/IMG_DATA/R60m/T22HBD_20210122T133229_WVP_60m.jp2",
"type": "image/jp2",
"title": "Water vapour (WVP)",
"gsd": null,
"proj:shape": [
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],
"proj:bbox": [
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"type": "image/jp2",
"title": "Scene classfication map (SCL)",
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"stac_extensions": [
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"sat",
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]
} |
gadomski
approved these changes
May 27, 2021
2 tasks
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Fixes #87
Assets for bands that are the highest spatial resolution available (e.g.
B01_10m,B05_20m) are keyed by the band name; for assets that are lower resolution than the highest resolution for that band, the resolution is added to the asset key, e.g. for B03 there are asset keysB03(10 meter resolution),B03_20m, andB03_60m.@jonas-eberle thanks for reporting the issue!