Module Automated Cloud Cover Assessment
Automated Cloud-Cover Assessment (ACCA) for Landsat TM/ETM+ imagery as proposed by Irish (2000). This module incorporates E.J. Tizado's GRASS GIS implementation (i.landsat.acca).
References:
- 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. online.
- 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. online.
- Author: B.Bechtel, O.Conrad (c) 2013
- Specification: grid
- Menu: Imagery|Landsat
Parameters
| | Name | Type | Identifier | Description | Constraints |
|---|
| Input | Landsat Band 2 | Grid (input) | BAND2 | - | - |
| Landsat Band 3 | Grid (input) | BAND3 | - | - |
| Landsat Band 4 | Grid (input) | BAND4 | - | - |
| Landsat Band 5 | Grid (input) | BAND5 | - | - |
| Landsat Band 6 | Grid (input) | BAND6 | - | - |
| Output | Cloud Cover | Grid (output) | CLOUD | - | - |
| Options | Apply post-processing filter to remove small holes | Boolean | FILTER | - | Default: 1 |
| B56 Composite (step 6) | Floating point | B56C | - | Default: 225.000000 |
| B45 Ratio: Desert detection (step 10) | Floating point | B45R | - | Default: 1.000000 |
| Always use cloud signature (step 14) | Boolean | CSIG | - | Default: 1 |
| Bypass second-pass processing, and merge warm (not ambiguous) and cold clouds | Boolean | PASS2 | - | Default: 1 |
| Include a category for cloud shadows | Boolean | SHADOW | - | Default: 1 |
Command-line
Usage: saga_cmd imagery_tools 9 [-BAND2 <str>] [-BAND3 <str>] [-BAND4 <str>] [-BAND5 <str>] [-BAND6 <str>] [-CLOUD <str>] [-FILTER <str>] [-B56C <str>] [-B45R <str>] [-CSIG <str>] [-PASS2 <str>] [-SHADOW <str>]
-BAND2:<str> Landsat Band 2
Grid (input)
-BAND3:<str> Landsat Band 3
Grid (input)
-BAND4:<str> Landsat Band 4
Grid (input)
-BAND5:<str> Landsat Band 5
Grid (input)
-BAND6:<str> Landsat Band 6
Grid (input)
-CLOUD:<str> Cloud Cover
Grid (output)
-FILTER:<str> Apply post-processing filter to remove small holes
Boolean
Default: 1
-B56C:<str> B56 Composite (step 6)
Floating point
Default: 225.000000
-B45R:<str> B45 Ratio: Desert detection (step 10)
Floating point
Default: 1.000000
-CSIG:<str> Always use cloud signature (step 14)
Boolean
Default: 1
-PASS2:<str> Bypass second-pass processing, and merge warm (not ambiguous) and cold clouds
Boolean
Default: 1
-SHADOW:<str> Include a category for cloud shadows
Boolean
Default: 1