The input and output products of BEAM Snow Radiance processor are:
Input:
Output: The output is a 'Snowradiance L2 product' which can contain the following bands:
Table 3.1. Regular bands
| Quantity | Bandname | Unit |
|---|---|---|
| Snow temperature | snow_temperature | K |
| Snow emissivity | snow_emissivity | dl |
| Snow grain size | snow_grain_size | mm |
| Soot concentration | soot_concentration | ng/g |
| Snow albedo (15 MERIS channels) | snow_albedo_n | dl |
| Water vapour | water_vapour | kg/m^2 |
| NDVI | ndvi | dl |
| NDSI | ndsi | dl |
| MDSI | mdsi | dl |
Table 3.2. Flag bands
| Quantity | Bandname | Unit |
|---|---|---|
| Snow Radiance flags | snowradiance_flags | dl |
| MERIS L1 flags | l1_flags_MERIS | dl |
| AATSR L1 confidence flags nadir | confid_flags_nadir_AATSR | dl |
| AATSR L1 confidence flags forward | confid_flags_fward_AATSR | dl |
| AATSR L1 cloud flags nadir | cloud_flags_nadir_AATSR | dl |
| AATSR L1 cloud flags forward | cloud_flags_fward_AATSR | dl |
From the user interface it can be specified which of these bands shall be computed and written to the output product.
The MERIS and AATSR L1 flags are simply copied from their input products, respectively. The 'Snow Radiance flags' reflect the results of the cloud/ice/snow discrimination. The coding of these flags is listed in the following table:
Table 3.3. Flag bands
| Name | Value | Description |
|---|---|---|
| F_NO_AATSR | 0 | pixel is outside AATSR coverage (in case of colocated product) |
| F_CLOUD | 1 | pixel was specified as cloudy |
| F_ICE | 2 | is covered with ice (AATSR NDSI criterion) |
| F_SNOW | 4 | is covered with snow (AATSR band criterion) |
| F_UNSPECIFIED | 8 | unspecified coverage (no cloud, ice or snow) |