SAGA-GIS Module Library Documentation (v2.1.3)

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.

Parameters

 NameTypeIdentifierDescriptionConstraints
InputLandsat Band 2Grid (input)BAND2--
Landsat Band 3Grid (input)BAND3--
Landsat Band 4Grid (input)BAND4--
Landsat Band 5Grid (input)BAND5--
Landsat Band 6Grid (input)BAND6--
OutputCloud CoverGrid (output)CLOUD--
OptionsApply post-processing filter to remove small holesBooleanFILTER-Default: 1
B56 Composite (step 6)Floating pointB56C-Default: 225.000000
B45 Ratio: Desert detection (step 10)Floating pointB45R-Default: 1.000000
Always use cloud signature (step 14)BooleanCSIG-Default: 1
Bypass second-pass processing, and merge warm (not ambiguous) and cold cloudsBooleanPASS2-Default: 1
Include a category for cloud shadowsBooleanSHADOW-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