BKA
Default BKA L1B or L1C products provided in the Charter, contain a single band panchromatic raster at 8 bits or a 4-band multispectral RGBN raster at 8 bits. Being visual products, they cannot be calibrated to derive radiance and reflectance assets. In the ESA Charter Mapper, BKA panchromatic and multispectral EO data are pre-processed using the Optical Products Calibration (OPT-Calib) service. In this particular case, the optical calibration processor does just a rescaling to 10000 of each band, which is needed to satisfy the default visualization configuration made for reflectance Single band assets. Due to the nature of BKA data, the output datasets cannot be employed in most of on-demand processors available in the ESA Charter Mapper.
Input
The input is an ingested BKA PSS or MSS dataset. Find details here.
Output
The output is a STAC item GeoJSON[^2] including single band and overview assets in COG format. Below is an example of assets included in the STAC item of a BKA L1C MSS dataset.
"assets": {
"blue": {
"type": "image/tiff; application=geotiff; profile=cloud-optimized",
"roles": [
"data",
"visual"
],
"href": "https://.../4077631-0220-MUL-C-1-1-1100761-150924T044238-ID-calibrated/blue.tif",
"eo:bands": [
{
"name": "blue",
"common_name": "blue",
"center_wavelength": 0.492,
"full_width_half_max": 0.04
}
],
"raster:bands": [
{
"spatial_resolution": 10.52
}
},
"green": {
"type": "image/tiff; application=geotiff; profile=cloud-optimized",
"roles": [
"data",
"visual"
],
"href": "https://.../4077631-0220-MUL-C-1-1-1100761-150924T044238-ID-calibrated/green.tif",
"eo:bands": [
{
"name": "green",
"common_name": "green",
"center_wavelength": 0.558,
"full_width_half_max": 0.07
}
],
"raster:bands": [
{
"spatial_resolution": 10.52
}
},
"red": {
"type": "image/tiff; application=geotiff; profile=cloud-optimized",
"roles": [
"data",
"visual"
],
"href": "https://.../4077631-0220-MUL-C-1-1-1100761-150924T044238-ID-calibrated/red.tif",
"eo:bands": [
{
"name": "red",
"common_name": "red",
"center_wavelength": 0.675,
"full_width_half_max": 0.09
}
],
"raster:bands": [
{
"spatial_resolution": 10.52
}
},
"nir": {
"type": "image/tiff; application=geotiff; profile=cloud-optimized",
"roles": [
"data",
"visual"
],
"href": "https://.../4077631-0220-MUL-C-1-1-1100761-150924T044238-ID-calibrated/nir.tif",
"eo:bands": [
{
"name": "nir",
"common_name": "nir",
"center_wavelength": 0.782,
"full_width_half_max": 0.1
}
],
"raster:bands": [
{
"spatial_resolution": 10.52
}
},
"overview-trc": {
"type": "image/tiff; application=geotiff; profile=cloud-optimized",
"roles": [
"composite",
"visual"
],
"href": "https://.../4077631-0220-MUL-C-1-1-1100761-150924T044238-ID-calibrated/overview-trc.tif"
},
"overview-civ": {
"type": "image/tiff; application=geotiff; profile=cloud-optimized",
"roles": [
"composite",
"visual"
],
"href": "https://.../4077631-0220-MUL-C-1-1-1100761-150924T044238-ID-calibrated/overview-civ.tif"
},
"overview-trc-low-res": {
"type": "image/tiff; application=geotiff; profile=cloud-optimized",
"roles": [
"composite",
"overview"
],
"href": "https://.../4077631-0220-MUL-C-1-1-1100761-150924T044238-ID-calibrated/overview-trc-low-res.tif"
}
}