LANDSAT - Revision history

Neteler at 10:31, 4 December 2018

2018-12-04T10:31:30Z

⚠️NikosA: Updated text in link to band designations

2017-06-22T07:54:40Z

Updated text in link to band designations

← Older revision		Revision as of 07:54, 22 June 2017
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	See also		See also

	* the [[Global datasets]] wiki page		* the [[Global datasets]] wiki page
	* [http://landsat.usgs.gov/band_designations_landsat_satellites.php ~~this page~~].		* [http://landsat.usgs.gov/band_designations_landsat_satellites.php Landsat satellites band designations].

	== Modules overview ==		== Modules overview ==

⚠️NikosA: Landsat on AWS

2017-06-22T07:52:20Z

Landsat on AWS

← Older revision		Revision as of 07:52, 22 June 2017
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	* [http://earthexplorer.usgs.gov/bulk/help Bulk Download Orders] using the [http://earthexplorer.usgs.gov/bulk/ Bulk Download Application]		* [http://earthexplorer.usgs.gov/bulk/help Bulk Download Orders] using the [http://earthexplorer.usgs.gov/bulk/ Bulk Download Application]
	* [http://landsatlook.usgs.gov/ LandsatLook Viewer]		* [http://landsatlook.usgs.gov/ LandsatLook Viewer]
			* [https://landsatonaws.com/ Landsat on Amazon Web Services]

	See also the [[Global datasets]] wiki page		See also
			* the [[Global datasets]] wiki page
	~~On 06/12/13, USGS [http://landsat.usgs.gov/about_LU_Vol_7_Issue_4.php announced] the availability of [http://landsat.usgs.gov/landsat8.php LANDSAT 8]. See also~~ [http://landsat.usgs.gov/band_designations_landsat_satellites.php this page].		* [http://landsat.usgs.gov/band_designations_landsat_satellites.php this page].

	== Modules overview ==		== Modules overview ==

⚠️NikosA: Landsat on AWS

2017-06-22T07:50:52Z

Landsat on AWS

← Older revision		Revision as of 07:50, 22 June 2017
Line 7:		Line 7:
	* [http://earthexplorer.usgs.gov/bulk/help Bulk Download Orders] using the [http://earthexplorer.usgs.gov/bulk/ Bulk Download Application]		* [http://earthexplorer.usgs.gov/bulk/help Bulk Download Orders] using the [http://earthexplorer.usgs.gov/bulk/ Bulk Download Application]
	* [http://landsatlook.usgs.gov/ LandsatLook Viewer]		* [http://landsatlook.usgs.gov/ LandsatLook Viewer]
	* [https://landsatonaws.com/ Landsat on Amazon Web Services]

	See also		See also the [[Global datasets]] wiki page
	* the [[Global datasets]] wiki page
	* [http://landsat.usgs.gov/band_designations_landsat_satellites.php this page].		On 06/12/13, USGS [http://landsat.usgs.gov/about_LU_Vol_7_Issue_4.php announced] the availability of [http://landsat.usgs.gov/landsat8.php LANDSAT 8]. See also [http://landsat.usgs.gov/band_designations_landsat_satellites.php this page].

	== Modules overview ==		== Modules overview ==

⚠️NikosA: Landsat on AWS

2017-06-22T07:50:17Z

Landsat on AWS

← Older revision		Revision as of 07:50, 22 June 2017
Line 7:		Line 7:
	* [http://earthexplorer.usgs.gov/bulk/help Bulk Download Orders] using the [http://earthexplorer.usgs.gov/bulk/ Bulk Download Application]		* [http://earthexplorer.usgs.gov/bulk/help Bulk Download Orders] using the [http://earthexplorer.usgs.gov/bulk/ Bulk Download Application]
	* [http://landsatlook.usgs.gov/ LandsatLook Viewer]		* [http://landsatlook.usgs.gov/ LandsatLook Viewer]
			* [https://landsatonaws.com/ Landsat on Amazon Web Services]

	See also the [[Global datasets]] wiki page		See also
			* the [[Global datasets]] wiki page
	~~On 06/12/13, USGS [http://landsat.usgs.gov/about_LU_Vol_7_Issue_4.php announced] the availability of [http://landsat.usgs.gov/landsat8.php LANDSAT 8]. See also~~ [http://landsat.usgs.gov/band_designations_landsat_satellites.php this page].		* [http://landsat.usgs.gov/band_designations_landsat_satellites.php this page].

	== Modules overview ==		== Modules overview ==

⚠️Sbl: Added new modules

2016-05-22T19:35:14Z

Added new modules

← Older revision		Revision as of 19:35, 22 May 2016
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	* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance		* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance
	* {{cmd\|i.landsat.acca}} → cloud cover assessment		* {{cmd\|i.landsat.acca}} → cloud cover assessment
			* {{cmd\|i.tasscap}} → Performs Tasseled Cap (Kauth Thomas) transformation

	=== Landsat specific GRASS AddOns ===		=== Landsat specific GRASS AddOns ===

	* {{AddonCmd\|i.landsat.trim\|version=64}} → trims border fringes for each band separately or with the MASK where coverage exists for all bands		* {{AddonCmd\|i.landsat.trim\|version=64}} → trims border fringes for each band separately or with the MASK where coverage exists for all bands
	* {{AddonCmd\|i.landsat.dehaze\|version=64}} ~~(addon)~~ → haze removal		* {{AddonCmd\|i.landsat.dehaze\|version=64}} → haze removal
			* {{AddonCmd\|i.landsat8.qc\|version=70}} → Reclass Landsat8 QA band according to acceptable pixel quality as defined by the user
			* {{AddonCmd\|i.landsat8.swlst\|version=70}} → Practical split-window algorithm estimating Land Surface Temperature from Landsat 8 OLI/TIRS imagery
			* {{AddonCmd\|i.wi\|version=70}} → Calculate different water indices

	== Pre-Processing ==		== Pre-Processing ==

⚠️Andbal: added info on haze removal

2016-02-16T22:19:31Z

added info on haze removal

← Older revision		Revision as of 22:19, 16 February 2016
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	=== Haze removal ===		=== Haze removal ===

	Simple haze removal can be done with {{AddonCmd\|i.landsat.dehaze\|version=64}}. ~~i.landsat.dehaze~~ applies a bandwise haze correction using tasscap4 (haze) and linear regression.		Simple haze removal can be done with {{AddonCmd\|i.landsat.dehaze\|version=64}}. This addons applies a bandwise haze correction using tasscap4 (haze) and linear regression.

			During the 2000s, prior acquired Landsat data were reprocessed to LPGS (Level 1 Product Generation System). Seems that with this level of processing, haze effect in raw data was removed and now is sufficient to apply {{Cmd\|i.colors.enhance}} to obtain a good image with high contrast.

	=== Atmospheric correction ===		=== Atmospheric correction ===

⚠️Andbal: Corrected link to manual page and external site

2015-12-11T09:21:13Z

Corrected link to manual page and external site

Neteler at 20:02, 20 November 2014

2014-11-20T20:02:17Z

← Older revision		Revision as of 20:02, 20 November 2014
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	* {{cmd\|d.rgb}} → display 3-band data		* {{cmd\|d.rgb}} → display 3-band data
	* {{cmd\|r.composite}} → flatten 3-bands of data into a single image (lossy, maybe used in combination with {{cmd\|i.landsat.rgb}})		* {{cmd\|r.composite}} → flatten 3-bands of data into a single image (lossy, maybe used in combination with {{cmd\|i.landsat.rgb}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x)
	* {{cmd\|i.atcorr}} → correct top of atmosphere to surface reflectance - see also the [[Atmospheric correction]] wiki page		* {{cmd\|i.atcorr}} → correct top of atmosphere to surface reflectance - see also the [[Atmospheric correction]] wiki page
	* {{cmd\|i.topo.corr}} → used to topographically correct reflectance from imagery files, e.g. obtained with {{cmd\|i.landsat.toar}}, using a sun illumination terrain model		* {{cmd\|i.topo.corr}} → used to topographically correct reflectance from imagery files, e.g. obtained with {{cmd\|i.landsat.toar}}, using a sun illumination terrain model
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	=== Landsat specific modules ===		=== Landsat specific modules ===

	* {{cmd\|i.landsat.rgb}} → auto-enhance colors		* {{cmd\|i.landsat.rgb}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x) → auto-enhance colors
	* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance		* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance
	* {{cmd\|i.landsat.acca}} → cloud cover assessment		* {{cmd\|i.landsat.acca}} → cloud cover assessment
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	Creating natural (also known as true-) color composites, can be done by		Creating natural (also known as true-) color composites, can be done by

	a) using {{cmd\|i.landsat.rgb}} to automatically balance the colors for the Red, Green and Blue bands		a) using {{cmd\|i.landsat.rgb}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x) to automatically balance the colors for the Red, Green and Blue bands

	or		or

Neteler: +Links to Processing Landsat 8 data in GRASS GIS 7

2014-11-08T19:15:34Z

+Links to Processing Landsat 8 data in GRASS GIS 7

← Older revision		Revision as of 19:15, 8 November 2014
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	* [http://landsat.usgs.gov/tools_access_all_faqs.php Frequently Asked Questions about the Landsat Missions]		* [http://landsat.usgs.gov/tools_access_all_faqs.php Frequently Asked Questions about the Landsat Missions]
			* [https://landsat8portal.eo.esa.int/portal/ European LANDSAT 8 data in near-realtime]
			* [http://courses.neteler.org/processing-landsat8-data-in-grass-gis-7/ Processing Landsat 8 data in GRASS GIS 7: Import and visualization]
			* [http://courses.neteler.org/processing-landsat-8-data-in-grass-gis-7-rgb-composites-and-pan-sharpening/ Processing Landsat 8 data in GRASS GIS 7: RGB composites and pan sharpening]

	[[Category: Documentation]]		[[Category: Documentation]]

← Older revision		Revision as of 19:35, 22 May 2016
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	* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance		* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance
	* {{cmd\|i.landsat.acca}} → cloud cover assessment		* {{cmd\|i.landsat.acca}} → cloud cover assessment
			* {{cmd\|i.tasscap}} → Performs Tasseled Cap (Kauth Thomas) transformation

	=== Landsat specific GRASS AddOns ===		=== Landsat specific GRASS AddOns ===

	* {{AddonCmd\|i.landsat.trim\|version=64}} → trims border fringes for each band separately or with the MASK where coverage exists for all bands		* {{AddonCmd\|i.landsat.trim\|version=64}} → trims border fringes for each band separately or with the MASK where coverage exists for all bands
	* {{AddonCmd\|i.landsat.dehaze\|version=64}} ~~(addon)~~ → haze removal		* {{AddonCmd\|i.landsat.dehaze\|version=64}} → haze removal
			* {{AddonCmd\|i.landsat8.qc\|version=70}} → Reclass Landsat8 QA band according to acceptable pixel quality as defined by the user
			* {{AddonCmd\|i.landsat8.swlst\|version=70}} → Practical split-window algorithm estimating Land Surface Temperature from Landsat 8 OLI/TIRS imagery
			* {{AddonCmd\|i.wi\|version=70}} → Calculate different water indices

	== Pre-Processing ==		== Pre-Processing ==

← Older revision		Revision as of 20:02, 20 November 2014
Line 19:		Line 19:

	* {{cmd\|d.rgb}} → display 3-band data		* {{cmd\|d.rgb}} → display 3-band data
	* {{cmd\|r.composite}} → flatten 3-bands of data into a single image (lossy, maybe used in combination with {{cmd\|i.landsat.rgb}})		* {{cmd\|r.composite}} → flatten 3-bands of data into a single image (lossy, maybe used in combination with {{cmd\|i.landsat.rgb}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x)
	* {{cmd\|i.atcorr}} → correct top of atmosphere to surface reflectance - see also the [[Atmospheric correction]] wiki page		* {{cmd\|i.atcorr}} → correct top of atmosphere to surface reflectance - see also the [[Atmospheric correction]] wiki page
	* {{cmd\|i.topo.corr}} → used to topographically correct reflectance from imagery files, e.g. obtained with {{cmd\|i.landsat.toar}}, using a sun illumination terrain model		* {{cmd\|i.topo.corr}} → used to topographically correct reflectance from imagery files, e.g. obtained with {{cmd\|i.landsat.toar}}, using a sun illumination terrain model
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	=== Landsat specific modules ===		=== Landsat specific modules ===

	* {{cmd\|i.landsat.rgb}} → auto-enhance colors		* {{cmd\|i.landsat.rgb}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x) → auto-enhance colors
	* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance		* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance
	* {{cmd\|i.landsat.acca}} → cloud cover assessment		* {{cmd\|i.landsat.acca}} → cloud cover assessment
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	Creating natural (also known as true-) color composites, can be done by		Creating natural (also known as true-) color composites, can be done by

	a) using {{cmd\|i.landsat.rgb}} to automatically balance the colors for the Red, Green and Blue bands		a) using {{cmd\|i.landsat.rgb}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x) to automatically balance the colors for the Red, Green and Blue bands

	or		or

← Older revision		Revision as of 10:31, 4 December 2018
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	* {{cmd\|d.rgb}} → display 3-band data		* {{cmd\|d.rgb}} → display 3-band data
	* {{cmd\|r.composite}} → flatten 3-bands of data into a single image (lossy, maybe used in combination with ~~{{cmd\|i.landsat.rgb\|version=64}} (GRASS 6.x) \|~~ {{cmd\|i.colors.enhance~~\|version=70~~}} ~~(GRASS 7.x)~~		* {{cmd\|r.composite}} → flatten 3-bands of data into a single image (lossy, maybe used in combination with {{cmd\|i.colors.enhance}}
	* {{cmd\|i.atcorr}} → correct top of atmosphere to surface reflectance - see also the [[Atmospheric correction]] wiki page		* {{cmd\|i.atcorr}} → correct top of atmosphere to surface reflectance - see also the [[Atmospheric correction]] wiki page
	* {{cmd\|i.topo.corr}} → used to topographically correct reflectance from imagery files, e.g. obtained with {{cmd\|i.landsat.toar}}, using a sun illumination terrain model		* {{cmd\|i.topo.corr}} → used to topographically correct reflectance from imagery files, e.g. obtained with {{cmd\|i.landsat.toar}}, using a sun illumination terrain model
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	=== Landsat specific modules ===		=== Landsat specific modules ===

	* ~~{{cmd\|i.landsat.rgb\|version=64}} (GRASS 6.x) \|~~ {{cmd\|i.colors.enhance~~\|version=70~~}} ~~(GRASS 7.x)~~ → auto-enhance colors		* {{cmd\|i.colors.enhance}} → auto-enhance colors
	* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance		* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance
	* {{cmd\|i.landsat.acca}} → cloud cover assessment		* {{cmd\|i.landsat.acca}} → cloud cover assessment
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	=== Landsat specific GRASS AddOns ===		=== Landsat specific GRASS AddOns ===

	* {{AddonCmd\|i.landsat.trim\|version=64}} → trims border fringes for each band separately or with the MASK where coverage exists for all bands		* {{AddonCmd\|i.landsat.trim\|version=7}} → trims border fringes for each band separately or with the MASK where coverage exists for all bands
	* {{AddonCmd\|i.landsat.dehaze\|version=64}} → haze removal		* {{AddonCmd\|i.landsat.dehaze\|version=7}} → haze removal
	* {{AddonCmd\|i.landsat8.qc\|version=70}} → Reclass Landsat8 QA band according to acceptable pixel quality as defined by the user		* {{AddonCmd\|i.landsat8.qc\|version=7}} → Reclass Landsat8 QA band according to acceptable pixel quality as defined by the user
	* {{AddonCmd\|i.landsat8.swlst\|version=70}} → Practical split-window algorithm estimating Land Surface Temperature from Landsat 8 OLI/TIRS imagery		* {{AddonCmd\|i.landsat8.swlst\|version=7}} → Practical split-window algorithm estimating Land Surface Temperature from Landsat 8 OLI/TIRS imagery
	* {{AddonCmd\|i.wi\|version=70}} → Calculate different water indices		* {{AddonCmd\|i.wi\|version=7}} → Calculate different water indices

	== Pre-Processing ==		== Pre-Processing ==
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	# geometrically & orthometrically correct imagery		# geometrically & orthometrically correct imagery
	#* already done for L1T products, read more at [http://landsat.usgs.gov//Landsat_Processing_Details.php USGS' Landsat Information Products] webpage		#* already done for L1T products, read more at [http://landsat.usgs.gov//Landsat_Processing_Details.php USGS' Landsat Information Products] webpage
	# optionally, automatically '''cut-off border fringes''' → {{AddonCmd\|i.landsat.trim\|version=64}}		# optionally, automatically '''cut-off border fringes''' → {{AddonCmd\|i.landsat.trim\|version=7}}
	#* of course one can use the official WRS2 Path/Row vector tiles to manually trim border fringes		#* of course one can use the official WRS2 Path/Row vector tiles to manually trim border fringes
	# optionally, '''denoise''' for obvious/intensive salt & pepper effects, stripes, etc.		# optionally, '''denoise''' for obvious/intensive salt & pepper effects, stripes, etc.
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	Creating natural (also known as true-) color composites, can be done by		Creating natural (also known as true-) color composites, can be done by

	a) using ~~{{cmd\|i.landsat.rgb\|version=64}} (GRASS 6.x) \|~~ {{cmd\|i.colors.enhance~~\|version=70~~}} ~~(GRASS 7.x)~~ to automatically balance the colors for the Red, Green and Blue bands		a) using {{cmd\|i.colors.enhance}} to automatically balance the colors for the Red, Green and Blue bands

	or		or
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	=== Haze removal ===		=== Haze removal ===

	Simple haze removal can be done with {{AddonCmd\|i.landsat.dehaze\|version=64}}. This addons applies a bandwise haze correction using tasscap4 (haze) and linear regression.		Simple haze removal can be done with {{AddonCmd\|i.landsat.dehaze\|version=7}}. This addons applies a bandwise haze correction using tasscap4 (haze) and linear regression.

	During the 2000s, prior acquired Landsat data were reprocessed to LPGS (Level 1 Product Generation System). Seems that with this level of processing, haze effect in raw data was removed and now is sufficient to apply {{Cmd\|i.colors.enhance}} to obtain a good image with high contrast.		During the 2000s, prior acquired Landsat data were reprocessed to LPGS (Level 1 Product Generation System). Seems that with this level of processing, haze effect in raw data was removed and now is sufficient to apply {{Cmd\|i.colors.enhance}} to obtain a good image with high contrast.

← Older revision		Revision as of 09:21, 11 December 2015
Line 10:		Line 10:
	See also the [[Global datasets]] wiki page		See also the [[Global datasets]] wiki page

	On 06/12/13, USGS [http://landsat.usgs.gov/~~LDCM_Landsat8~~.php announced] the availability of [http://landsat.usgs.gov/~~about_LU_Vol_7_Issue_4~~.php LANDSAT 8]. See also [http://landsat.usgs.gov/band_designations_landsat_satellites.php this page].		On 06/12/13, USGS [http://landsat.usgs.gov/about_LU_Vol_7_Issue_4.php announced] the availability of [http://landsat.usgs.gov/landsat8.php LANDSAT 8]. See also [http://landsat.usgs.gov/band_designations_landsat_satellites.php this page].

	== Modules overview ==		== Modules overview ==
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	* {{cmd\|d.rgb}} → display 3-band data		* {{cmd\|d.rgb}} → display 3-band data
	* {{cmd\|r.composite}} → flatten 3-bands of data into a single image (lossy, maybe used in combination with {{cmd\|i.landsat.rgb}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x)		* {{cmd\|r.composite}} → flatten 3-bands of data into a single image (lossy, maybe used in combination with {{cmd\|i.landsat.rgb\|version=64}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x)
	* {{cmd\|i.atcorr}} → correct top of atmosphere to surface reflectance - see also the [[Atmospheric correction]] wiki page		* {{cmd\|i.atcorr}} → correct top of atmosphere to surface reflectance - see also the [[Atmospheric correction]] wiki page
	* {{cmd\|i.topo.corr}} → used to topographically correct reflectance from imagery files, e.g. obtained with {{cmd\|i.landsat.toar}}, using a sun illumination terrain model		* {{cmd\|i.topo.corr}} → used to topographically correct reflectance from imagery files, e.g. obtained with {{cmd\|i.landsat.toar}}, using a sun illumination terrain model
	* {{cmd\|i.oif}} → calculate the 3 bands showing the greatest difference (for use as R,G,B bands)		* {{cmd\|i.oif}} → calculate the 3 bands showing the greatest difference (for use as R,G,B bands)
	* ~~[https://svn.geotools.org/grass/grass-addons/grass7/imagery/i.histo.match/i.histo.match.html~~ i.histo.match] → histogram matching of two or more raster maps (in grass 7) ''Note, the module works with integer values and does not accept the "." character as part of the raster map's name!''		* {{AddonCmd\|i.histo.match}} (addon) → histogram matching of two or more raster maps (in grass 7) ''Note, the module works with integer values and does not accept the "." character as part of the raster map's name!''

	=== Landsat specific modules ===		=== Landsat specific modules ===

	* {{cmd\|i.landsat.rgb}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x) → auto-enhance colors		* {{cmd\|i.landsat.rgb\|version=64}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x) → auto-enhance colors
	* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance		* {{cmd\|i.landsat.toar}} → convert DN to top of atmosphere radiance
	* {{cmd\|i.landsat.acca}} → cloud cover assessment		* {{cmd\|i.landsat.acca}} → cloud cover assessment
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	=== Landsat specific GRASS AddOns ===		=== Landsat specific GRASS AddOns ===

	* {{AddonCmd\|i.landsat.trim}} → trims border fringes for each band separately or with the MASK where coverage exists for all bands		* {{AddonCmd\|i.landsat.trim\|version=64}} → trims border fringes for each band separately or with the MASK where coverage exists for all bands
	* {{AddonCmd\|i.landsat.dehaze}} (addon) → haze removal		* {{AddonCmd\|i.landsat.dehaze\|version=64}} (addon) → haze removal

	== Pre-Processing ==		== Pre-Processing ==
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	# '''import''' in the database → {{cmd\|r.in.gdal}}		# '''import''' in the database → {{cmd\|r.in.gdal}}
	# geometrically & orthometrically correct imagery		# geometrically & orthometrically correct imagery
	#* already done for L1T products, read more at [http://landsat.usgs.gov/~~products_productinformation~~.php USGS' Landsat Information Products] webpage		#* already done for L1T products, read more at [http://landsat.usgs.gov//Landsat_Processing_Details.php USGS' Landsat Information Products] webpage
	# optionally, automatically '''cut-off border fringes''' → {{~~cmd~~\|i.landsat.trim}}		# optionally, automatically '''cut-off border fringes''' → {{AddonCmd\|i.landsat.trim\|version=64}}
	#* of course one can use the official WRS2 Path/Row vector tiles to manually trim border fringes		#* of course one can use the official WRS2 Path/Row vector tiles to manually trim border fringes
	# optionally, '''denoise''' for obvious/intensive salt & pepper effects, stripes, etc.		# optionally, '''denoise''' for obvious/intensive salt & pepper effects, stripes, etc.
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	# '''topographically normalise''' imagery → {{cmd\|i.topo.corr}}		# '''topographically normalise''' imagery → {{cmd\|i.topo.corr}}
	#* also known as topographic correction, that is, accounting for illumination differences due to the acquisition's geometry		#* also known as topographic correction, that is, accounting for illumination differences due to the acquisition's geometry
	# '''radiometrically normalise''' → one approach via ~~[https://svn.geotools.org/grass/grass-addons/grass7/imagery/i.histo.match/i.histo.match.html~~ i.histo.match] (in '''grass 7'''), also known as relative radiometric normalisation -- one approach is the ''histogram matching'' technique of two or more raster maps		# '''radiometrically normalise''' → one approach via {{AddonCmd\|i.histo.match}} (in '''grass 7''', addon), also known as relative radiometric normalisation -- one approach is the ''histogram matching'' technique of two or more raster maps
	#* '''ToDo/More techniques?'''		#* '''ToDo/More techniques?'''

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	'''Note,''' the (newest) official naming pattern for Landsat scenes -- explained in [~~http~~://~~earthexplorer~~.usgs.gov~~/resources/helpdocs/dict~~/landsat_dictionary.html USGS' Landsat Data Dictionary] as the [~~http~~://~~earthexplorer~~.usgs.gov~~/resources/helpdocs/dict~~/landsat_dictionary.html#entity_id Landsat Scene Identifier] -- and all individual bands that compose a scene -- bands have a suffix which is like _B10, _B20, _B30, etc. -- differ from what some Landsat specific modules expect. For example, the modules {{cmd\|i.landsat.toar}} and {{cmd\|i.landsat.acca}} expect the bands to follow a naming pattern such as "scenename.1, .2, .3", etc.		'''Note,''' the (newest) official naming pattern for Landsat scenes -- explained in [https://lta.cr.usgs.gov/landsat_dictionary.html USGS' Landsat Data Dictionary] as the [https://lta.cr.usgs.gov/landsat_dictionary.html#entity_id Landsat Scene Identifier] -- and all individual bands that compose a scene -- bands have a suffix which is like _B10, _B20, _B30, etc. -- differ from what some Landsat specific modules expect. For example, the modules {{cmd\|i.landsat.toar}} and {{cmd\|i.landsat.acca}} expect the bands to follow a naming pattern such as "scenename.1, .2, .3", etc.


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	Creating natural (also known as true-) color composites, can be done by		Creating natural (also known as true-) color composites, can be done by

	a) using {{cmd\|i.landsat.rgb}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x) to automatically balance the colors for the Red, Green and Blue bands		a) using {{cmd\|i.landsat.rgb\|version=64}} (GRASS 6.x) \| {{cmd\|i.colors.enhance\|version=70}} (GRASS 7.x) to automatically balance the colors for the Red, Green and Blue bands

	or		or
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	=== Haze removal ===		=== Haze removal ===

	Simple haze removal can be done with {{AddonCmd\|i.landsat.dehaze}}. i.landsat.dehaze applies a bandwise haze correction using tasscap4 (haze) and linear regression.		Simple haze removal can be done with {{AddonCmd\|i.landsat.dehaze\|version=64}}. i.landsat.dehaze applies a bandwise haze correction using tasscap4 (haze) and linear regression.


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	=== Cloud identification ===		=== Cloud identification ===

	Identify clouds in the image with {{cmd\|i.landsat.acca~~\|version=65~~}}:		Identify clouds in the image with {{cmd\|i.landsat.acca}}:
	<source lang="bash">i.landsat.acca -f input_prefix=226_62_toar. output=226_62.acca_cloudmask</source>		<source lang="bash">i.landsat.acca -f input_prefix=226_62_toar. output=226_62.acca_cloudmask</source>