| Tool Name | Cloud Shadow Detection |
| Tool ID | 21 |
| Library ID | imagery_tools |
| Version | 1.0 |
| Author(s) | J.Spitzmüller, O.Conrad (c) 2023 |
Irish, R.R. (2000): Landsat 7 Automatic Cloud Cover Assessment. In: Shen, S.S., Descour, M.R. [Eds.]: Algorithms for Multispectral, Hyperspectral, and Ultraspectral Imagery VI. Proceedings of SPIE, 4049: 348-355. doi:10.1117/12.410358
Tizado, E.J. (2010): GRASS GIS i.landsat.acca. E.J. Tizado's implementation of the ACCA algorithm as proposed by Irish (2000), Irish et al. (2006). Source Code
| Name | Type | Identifier | Description | Constraints |
|---|---|---|---|---|
| Input | ||||
| Clouds | grid, input | CLOUDS | ||
| Candidates | grid, input | CAND_GRID_IN | ||
| Elevation | grid, input, optional | DEM | ||
| Green | grid, input | BAND_GREEN | ||
| Red | grid, input | BAND_RED | ||
| Near Infrared | grid, input | BAND_NIR | ||
| Shortwave Infrared | grid, input | BAND_SWIR | ||
| Thermal | grid, input, optional | BAND_THERMAL | ||
| Brightness Bands | grid list, input | BANDS_BRIGHTNESS | ||
| Output | ||||
| Cloud Number | grid, output, optional | CLOUD_ID | ||
| Candidates | grid, output, optional | CAND_GRID_OUT | ||
| Shadows | grid, output | SHADOWS | ||
| Cloud Info | table, output | CLOUD_INFO | ||
| Options | ||||
| Output | choice | OUTPUT | Available Choices: [0] visible shadow [1] full shadow [2] shadow and clouds Default: 2 | |
| Value | floating point number | CAND_GRID_VALUE | Default: 0.000000 | |
| Unit | choice | THERMAL_UNIT | Available Choices: [0] Kelvin [1] Celsius Default: 0 | |
| Candidates | choice | CANDIDATES | Available Choices: [0] all cells of candidates grid that are not no-data [1] all cells of candidates grid with a specified value [2] average brightness threshold [3] Irish [4] Irish modified by Tizado Default: 0 | |
| Brightness Threshold | floating point number | BRIGHTNESS | Minimum: 0.000000 Maximum: 1.000000 Default: 0.050000 | |
| Processing | choice | PROCESSING | Available Choices: [0] all clouds at once [1] cloud by cloud Default: 0 | |
| Azimuth | floating point number | SUN_AZIMUTH | Direction of sun clockwise from North [degree]. | Minimum: 0.000000 Maximum: 360.000000 Default: -180.000000 |
| Height | floating point number | SUN_HEIGHT | Height of sun above horizon [degree]. | Minimum: 0.000000 Maximum: 90.000000 Default: 45.000000 |
| Cloud Height | value range | CLOUD_HEIGHT | The range of cloud height above ground to be tested. | |