| Tool Name | Automated Cloud Cover Assessment |
| Tool ID | 9 |
| Library ID | imagery_tools |
| Version | 1.0 |
| Author(s) | B.Bechtel, O.Conrad (c) 2013 |
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
Irish, R.R., Barker, J.L., Goward, S.N., Arvidson, T. (2006): Characterization of the Landsat-7 ETM+ Automated Cloud-Cover Assessment (ACCA) Algorithm. Photogrammetric Engineering and Remote Sensing vol. 72(10): 1179-1188. doi:10.14358/PERS.72.10.1179
Tizado, E.J. (2010): GRASS GIS i.landsat.acca. E.J. Tizado's implementation of the method proposed by Irish (2000), Irish et al. (2006). Source Code
| Name | Type | Identifier | Description | Constraints |
|---|---|---|---|---|
| Input | ||||
| Green | grid, input | BAND2 | Reflectance | |
| Red | grid, input | BAND3 | Reflectance | |
| NIR | grid, input | BAND4 | Reflectance | |
| SWIR | grid, input | BAND5 | Reflectance | |
| Thermal | grid, input | BAND6 | Kelvin | |
| Output | ||||
| Clouds | grid, output | CLOUD | ||
| Options | ||||
| SWIR/Thermal Threshold | floating point number | B56C | Threshold for SWIR/Thermal Composite (step 6). | Default: 225.000000 |
| Desert Detection Threshold | floating point number | B45R | Threshold for desert detection (step 10, NIR/SWIR Ratio). | Default: 1.000000 |
| Temperature Histogram | integer number | HIST_N | Number of classes in the cloud temperature histogram. | Minimum: 10 Default: 100 |
| Cloud Signature | boolean | CSIG | Always use cloud signature (step 14). | Default: 1 |
| Cloud Differentiation | boolean | PASS2 | Differentiate between warm (not ambiguous) and cold clouds. | Default: 0 |
| Shadows | boolean | SHADOW | Include a category for cloud shadows. | Default: 1 |
| Filter | boolean | FILTER | Apply post-processing filter to remove small holes. | Default: 1 |