IKONOS - Revision history

Neteler: remove hardcoded version specific urls, use latest version

2018-12-04T10:05:30Z

remove hardcoded version specific urls, use latest version

← Older revision		Revision as of 10:05, 4 December 2018
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	* {{cmd\|r.mapcalc}}		* {{cmd\|r.mapcalc}}
	* {{cmd\|r.colors}}		* {{cmd\|r.colors}}
	* {{cmd\|i.colors.enhance~~\|version=70~~}}		* {{cmd\|i.colors.enhance}}
	* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}		* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}
	* {{cmd\|i.pansharpen}}		* {{cmd\|i.pansharpen}}

⚠️NikosA: updated list of grass related modules

2016-08-14T08:15:54Z

updated list of grass related modules

← Older revision		Revision as of 08:15, 14 August 2016
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	* {{cmd\|r.mapcalc}}		* {{cmd\|r.mapcalc}}
	* {{cmd\|r.colors}}		* {{cmd\|r.colors}}
	* {{cmd\|i.~~landsat~~.~~rgb~~}}		* {{cmd\|i.colors.enhance\|version=70}}
	* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}		* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}
	* {{cmd\|i.pansharpen}}		* {{cmd\|i.pansharpen}}

⚠️NikosA: updated link to i.ikonos.toar

2016-08-14T05:05:13Z

updated link to i.ikonos.toar

← Older revision		Revision as of 05:05, 14 August 2016
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	* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}		* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}
	* {{cmd\|i.pansharpen}}		* {{cmd\|i.pansharpen}}
	* https://github.com/NikosAlexandris/i.ikonos.toar		* [https://github.com/NikosAlexandris/i.ikonos.toar i.ikonos.toar]
	* {{cmd\|i.vi}}		* {{cmd\|i.vi}}
	* {{cmd\|i.segment}}		* {{cmd\|i.segment}}

⚠️NikosA: updated list of related GRASS modules

2016-08-14T05:04:25Z

updated list of related GRASS modules

← Older revision		Revision as of 05:04, 14 August 2016
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	* {{cmd\|r.colors}}		* {{cmd\|r.colors}}
	* {{cmd\|i.landsat.rgb}}		* {{cmd\|i.landsat.rgb}}
			* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}
	* {{cmd\|i.pansharpen}}		* {{cmd\|i.pansharpen}}
			* https://github.com/NikosAlexandris/i.ikonos.toar
	* {{cmd\|i.vi}}		* {{cmd\|i.vi}}
	* {{cmd\|i.segment}}		* {{cmd\|i.segment}}
	* ...''more to add''

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

⚠️NikosA: /* Deriving Physical Quantities */

2016-08-14T05:01:28Z

Deriving Physical Quantities

← Older revision		Revision as of 05:01, 14 August 2016
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	=== Deriving Physical Quantities ===		=== Deriving Physical Quantities ===

	Conversions are implemented in a GRASS module available at https://github.com/NikosAlexandris/i.ikonos.toar. ~~Detailed descriptions below.~~		Conversions are implemented in a GRASS module available at https://github.com/NikosAlexandris/i.ikonos.toar.


			''Details''


	Converting Digital Numbers to Radiance/Reflectance requires knowledge about the sensor's specific spectral band parameters. Those are, as extracted from the document ''IKONOS Planetary Reflectance and Mean Solar Exoatmospheric Irradiance'', by Martin Taylor (see references):		Converting Digital Numbers to Radiance/Reflectance requires knowledge about the sensor's specific spectral band parameters. Those are, as extracted from the document ''IKONOS Planetary Reflectance and Mean Solar Exoatmospheric Irradiance'', by Martin Taylor (see references):

⚠️NikosA: i.ikonos.toar

2016-08-14T05:00:38Z

i.ikonos.toar

← Older revision		Revision as of 05:00, 14 August 2016
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	=== Deriving Physical Quantities ===		=== Deriving Physical Quantities ===

			Conversions are implemented in a GRASS module available at https://github.com/NikosAlexandris/i.ikonos.toar. Detailed descriptions below.

	Converting Digital Numbers to Radiance/Reflectance requires knowledge about the sensor's specific spectral band parameters. Those are, as extracted from the document ''IKONOS Planetary Reflectance and Mean Solar Exoatmospheric Irradiance'', by Martin Taylor (see references):		Converting Digital Numbers to Radiance/Reflectance requires knowledge about the sensor's specific spectral band parameters. Those are, as extracted from the document ''IKONOS Planetary Reflectance and Mean Solar Exoatmospheric Irradiance'', by Martin Taylor (see references):

⚠️NikosA: edits related to i.fusion.hpf

2016-08-14T04:58:15Z

edits related to i.fusion.hpf

← Older revision		Revision as of 04:58, 14 August 2016
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	==== Pan-Sharpening based on the HPFA technique ====		==== Pan-Sharpening based on the HPFA technique ====

	The ~~process~~ involves a convolution using a High Pass Filter (HPF) on the high resolution data, then combining this with the lower resolution multispectral data.		The technique, implemented via the GRASS add-on {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}, as indicated above, involves a convolution using a High Pass Filter (HPF) on the high resolution data, then combining this with the lower resolution multispectral data.


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	# Adding a weighted High-Pass-Filtered image to the upsampled Multi-Spectral image		# Adding a weighted High-Pass-Filtered image to the upsampled Multi-Spectral image
	# Optionally, matching the histogram of the Pan-Sharpened image to the one of the original Multi-Spectral image		# Optionally, matching the histogram of the Pan-Sharpened image to the one of the original Multi-Spectral image

	All of the above steps can be replicated in GRASS GIS. ''A working bash shell script, for GRASS-GIS ver. 6.4, that implements the algorithm is currently available at [https://github.com/NikosAlexandris/i.fusion.hpf.sh i.fusion.hpf].''

	~~Screenshots: to be added!~~

	=== Color Composites ===		=== Color Composites ===

⚠️NikosA: /* Pan-Sharpening */

2016-08-14T04:55:41Z

Pan-Sharpening

← Older revision		Revision as of 04:55, 14 August 2016
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	=== Pan-Sharpening ===		=== Pan-Sharpening ===

	[http://en.wikipedia.org/wiki/Pansharpened_image Pan-Sharpening] / [http://en.wikipedia.org/wiki/Image_fusion Fusion] is the process of merging high-resolution panchromatic and lower resolution multi-spectral imagery. [http://grass.osgeo.org/grass70/ GRASS 7] holds a dedicated pan-sharpening module, {{cmd\|i.pansharpen}} which features three techniques for sharpening, namely the [http://wiki.awf.forst.uni-goettingen.de/wiki/index.php/Brovey_Transformation Brovey transformation], the classical IHS method and one that is based on [[Principal Components Analysis]] (PCA). Another algorithm deriving excellent detail and a realistic representation of original multispectral scene colors, is the High-Pass Filter Addition (HPFA) technique. It is available through the add-on {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}} (for GRASS 6, please refer to a bash shell script https://github.com/NikosAlexandris/i.fusion.hpf which is, however, unmaintained).		[http://en.wikipedia.org/wiki/Pansharpened_image Pan-Sharpening] / [http://en.wikipedia.org/wiki/Image_fusion Fusion] is the process of merging high-resolution panchromatic and lower resolution multi-spectral imagery. [http://grass.osgeo.org/grass70/ GRASS 7] holds a dedicated pan-sharpening module, {{cmd\|i.pansharpen}} which features three techniques for sharpening, namely the [http://wiki.awf.forst.uni-goettingen.de/wiki/index.php/Brovey_Transformation Brovey transformation], the classical IHS method and one that is based on [[Principal Components Analysis]] (PCA). Another algorithm deriving excellent detail and a realistic representation of original multispectral scene colors, is the High-Pass Filter Addition (HPFA) technique. It is available through the add-on {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}} (for GRASS 6, please refer to a bash shell script https://github.com/NikosAlexandris/i.fusion.hpf.sh which is, however, unmaintained).

⚠️NikosA: i.fusion.hpf

2016-08-14T04:54:01Z

i.fusion.hpf

← Older revision		Revision as of 04:54, 14 August 2016
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	=== Pan-Sharpening ===		=== Pan-Sharpening ===

	[http://en.wikipedia.org/wiki/Pansharpened_image Pan-Sharpening] / [http://en.wikipedia.org/wiki/Image_fusion Fusion] is the process of merging high-resolution panchromatic and lower resolution multi-spectral imagery. [http://grass.osgeo.org/grass70/ GRASS 7] holds a dedicated pan-sharpening module, {{cmd\|i.pansharpen}} which features three techniques for sharpening, namely the [http://wiki.awf.forst.uni-goettingen.de/wiki/index.php/Brovey_Transformation Brovey transformation], the classical IHS method and one that is based on [[Principal Components Analysis]] (PCA). Another algorithm deriving excellent detail and a realistic representation of original multispectral scene colors, is the High-Pass Filter Addition (HPFA) technique.		[http://en.wikipedia.org/wiki/Pansharpened_image Pan-Sharpening] / [http://en.wikipedia.org/wiki/Image_fusion Fusion] is the process of merging high-resolution panchromatic and lower resolution multi-spectral imagery. [http://grass.osgeo.org/grass70/ GRASS 7] holds a dedicated pan-sharpening module, {{cmd\|i.pansharpen}} which features three techniques for sharpening, namely the [http://wiki.awf.forst.uni-goettingen.de/wiki/index.php/Brovey_Transformation Brovey transformation], the classical IHS method and one that is based on [[Principal Components Analysis]] (PCA). Another algorithm deriving excellent detail and a realistic representation of original multispectral scene colors, is the High-Pass Filter Addition (HPFA) technique. It is available through the add-on {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}} (for GRASS 6, please refer to a bash shell script https://github.com/NikosAlexandris/i.fusion.hpf which is, however, unmaintained).

⚠️NikosA: /* Automatising Conversions */ Added link to https://github.com/NikosAlexandris/i.ikonos.toar

2014-11-17T20:14:17Z

Automatising Conversions: Added link to https://github.com/NikosAlexandris/i.ikonos.toar

← Older revision		Revision as of 20:14, 17 November 2014
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	==== Automatising Conversions ====		==== Automatising Conversions ====

	The conversion process can be scripted to avoid repeating the same steps for each band separately. In bash, such a script might be as the following example. '''Note,''' however, in this example script constants, band parameters and acquisition related metadata are hard-coded!		The conversion process can be scripted to avoid repeating the same steps for each band separately.

			===== Python =====

			A custom python script, performing the operations of interest, might be like [https://github.com/NikosAlexandris/i.ikonos.toar i.ikonos.toar (for GRASS 7.x)]

			===== Bash =====
			In bash, such a script might be as the following example. '''Note,''' however, in this example script constants, band parameters and acquisition related metadata are hard-coded!

	<source lang="bash">		<source lang="bash">
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	done		done
	</source>		</source>
	~~''ToAdd''~~

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

← Older revision		Revision as of 10:05, 4 December 2018
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	* {{cmd\|r.mapcalc}}		* {{cmd\|r.mapcalc}}
	* {{cmd\|r.colors}}		* {{cmd\|r.colors}}
	* {{cmd\|i.colors.enhance~~\|version=70~~}}		* {{cmd\|i.colors.enhance}}
	* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}		* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}
	* {{cmd\|i.pansharpen}}		* {{cmd\|i.pansharpen}}

← Older revision		Revision as of 08:15, 14 August 2016
Line 31:		Line 31:
	* {{cmd\|r.mapcalc}}		* {{cmd\|r.mapcalc}}
	* {{cmd\|r.colors}}		* {{cmd\|r.colors}}
	* {{cmd\|i.~~landsat~~.~~rgb~~}}		* {{cmd\|i.colors.enhance\|version=70}}
	* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}		* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}
	* {{cmd\|i.pansharpen}}		* {{cmd\|i.pansharpen}}

← Older revision		Revision as of 05:05, 14 August 2016
Line 34:		Line 34:
	* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}		* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}
	* {{cmd\|i.pansharpen}}		* {{cmd\|i.pansharpen}}
	* https://github.com/NikosAlexandris/i.ikonos.toar		* [https://github.com/NikosAlexandris/i.ikonos.toar i.ikonos.toar]
	* {{cmd\|i.vi}}		* {{cmd\|i.vi}}
	* {{cmd\|i.segment}}		* {{cmd\|i.segment}}

← Older revision		Revision as of 05:04, 14 August 2016
Line 32:		Line 32:
	* {{cmd\|r.colors}}		* {{cmd\|r.colors}}
	* {{cmd\|i.landsat.rgb}}		* {{cmd\|i.landsat.rgb}}
			* {{AddonSrc\|imagery\|i.fusion.hpf\|version=7}}
	* {{cmd\|i.pansharpen}}		* {{cmd\|i.pansharpen}}
			* https://github.com/NikosAlexandris/i.ikonos.toar
	* {{cmd\|i.vi}}		* {{cmd\|i.vi}}
	* {{cmd\|i.segment}}		* {{cmd\|i.segment}}
	* ...''more to add''

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