ILMSimage 2.4 Cell Creation - Revision history

DanielS at 13:07, 3 October 2012

2012-10-03T13:07:58Z

← Older revision		Revision as of 13:07, 3 October 2012
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	• ''[[ILMSimage_2.4_Miscellaneous \| Miscellaneous]]''		• ''[[ILMSimage_2.4_Miscellaneous \| Miscellaneous]]''
	-----		-----
−		+	[[pt:ILMSimage_2.4_Criação_de_células]]

DanielS at 12:23, 10 September 2012

2012-09-10T12:23:05Z

PeterS at 11:55, 15 March 2012

2012-03-15T11:55:42Z

← Older revision		Revision as of 11:55, 15 March 2012
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	==Parameters==		==Parameters==

−	#'''Minimum Modulation for input''' A suitable value for the input in ''Modulation (Mean Cell Size)'' is difficult to guess, so the button ''Determine'' starts a routine that calculates the mean modulation of the selected images. The result is shown in the box left of the button. The enty in ''Modulation (mean Cell Size) should be considerably higher than the result in ''Minimum Modulation for Input''.	+	*'''Minimum Modulation for input''' A suitable value for the input in ''Modulation (Mean Cell Size)'' is difficult to guess, so the button ''Determine'' starts a routine that calculates the mean modulation of the selected images. The result is shown in the box left of the button. The enty in ''Modulation (mean Cell Size) should be considerably higher than the result in ''Minimum Modulation for Input''.
−	#'''Modulation (Mean Cell Size)''' is the most sigificant input parameter. The input determines the size of all of the resulting homogeneous areas referred as "cells" resulting from the cell creation procedure. Smaller values of ''modulation'' lead to smaller cells. Input values from 0 to 1 are defined.	+	*'''Modulation (Mean Cell Size)''' is the most sigificant input parameter. The input determines the size of all of the resulting homogeneous areas referred as "cells" resulting from the cell creation procedure. Smaller values of ''modulation'' lead to smaller cells. Input values from 0 to 1 are defined.
−	#'''Homogeneous Cell Size''' determines the distribution of different cell sizes after the cell creation process. Small values ( 0.0 - 0.1) lead to a "natural" size distribution with highly different areas covered by a single cell. This is the normal case, but it can be useful to keep the cell size rather equal in order to carry out unusual classification tasks.	+	*'''Homogeneous Cell Size''' determines the distribution of different cell sizes after the cell creation process. Small values ( 0.0 - 0.1) lead to a "natural" size distribution with highly different areas covered by a single cell. This is the normal case, but it can be useful to keep the cell size rather equal in order to carry out unusual classification tasks.
−	#'''Minimum Cell Sze''' assures that all cells consihst at least of the amount of pixles in the enty. If cells are smaller than the entry, ILMSimage distributes their pixels equally among neighboring cells. This process is independent from image data.	+	*'''Minimum Cell Sze''' assures that all cells consihst at least of the amount of pixles in the enty. If cells are smaller than the entry, ILMSimage distributes their pixels equally among neighboring cells. This process is independent from image data.
−	#'''Provide External Borders''' transfers all borders from the given shape to the cells. ILMSimage may add additional borders within the predestinated cells. The entry of ''External Borders'' is optional.	+	*'''Provide External Borders''' transfers all borders from the given shape to the cells. ILMSimage may add additional borders within the predestinated cells. The entry of ''External Borders'' is optional.

	ILMSImage uses a tile concept to process large data layers efficiently. The maximum size of the applied tiles can be restricted by an input in '''Tilesize [MB]''' at the lower left corner of the ILMSimage menue. Under normal conditions ILMSimage uses up to 10 tiles simultainiously, so for 1000 MB free working menory an entry of "100 MB" is recommended.		ILMSImage uses a tile concept to process large data layers efficiently. The maximum size of the applied tiles can be restricted by an input in '''Tilesize [MB]''' at the lower left corner of the ILMSimage menue. Under normal conditions ILMSimage uses up to 10 tiles simultainiously, so for 1000 MB free working menory an entry of "100 MB" is recommended.

PeterS at 11:35, 15 March 2012

2012-03-15T11:35:10Z

← Older revision		Revision as of 11:35, 15 March 2012
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−	*'''''[[ILMSImage_2.4_Tutorial \| Overview]]~~'''~~''	+	-----
−	*'''''[[ILMSimage_2.4_Project_Settings \| Project Settings]]~~'''~~''	+	''[[ILMSImage_2.4_Tutorial \| Overview]]''
−	*'''''[[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]'''''	+	• ''[[ILMSimage_2.4_Project_Settings \| Project Settings]]''
		+	• ''[[ILMSimage_2.4_Cell_Creation \| Cell Creation]]''
		+	• ''[[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]''
		+	• ''[[IMLSimage_2.4_Classification \| Classification]]''
		+	• ''[[ILMSimage_2.4_Miscellaneous \| Miscellaneous]]''
		+	-----


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	The range of values of the parameter lies between 0 and 1; it has to be noted that the extreme values do not lead to meaningful results under any circumstances. The value 0.03 is a predefined modulation value which has proven to be a good starting point for cell creation for a combination of spatially more highly resolved panchromatic data and spatially more lowly resolved multi-spectral data (as they are used in the current example). This default setting can be modified by the user concerning the cell creation parameter, so that it corresponds to the typical area size which is required for the analysis. The result of a new cell creation is a raster data set which has the pixel size of the most highly resolved input data, which can be found in the project directory and ends in <code>_index</code>. As ILMSImage requires exclusive access to the corresponding file for more operations, it is not automatically loaded into the map view. For visualizing the cell creation result the option of Export as Shapefile (see below) is more suitable.		The range of values of the parameter lies between 0 and 1; it has to be noted that the extreme values do not lead to meaningful results under any circumstances. The value 0.03 is a predefined modulation value which has proven to be a good starting point for cell creation for a combination of spatially more highly resolved panchromatic data and spatially more lowly resolved multi-spectral data (as they are used in the current example). This default setting can be modified by the user concerning the cell creation parameter, so that it corresponds to the typical area size which is required for the analysis. The result of a new cell creation is a raster data set which has the pixel size of the most highly resolved input data, which can be found in the project directory and ends in <code>_index</code>. As ILMSImage requires exclusive access to the corresponding file for more operations, it is not automatically loaded into the map view. For visualizing the cell creation result the option of Export as Shapefile (see below) is more suitable.

−	''[[ILMSImage_2.4_Tutorial \| Overview]]'' ~~\| '''~~''[[ILMSimage_2.4_Project_Settings \| Project Settings]]''''' \| ''[[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]''	+
		+
		+	-----
		+	''[[ILMSImage_2.4_Tutorial \| Overview]]''
		+	• ''[[ILMSimage_2.4_Project_Settings \| Project Settings]]''
		+	• ''[[ILMSimage_2.4_Cell_Creation \| Cell Creation]]''
		+	• ''[[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]''
		+	• ''[[IMLSimage_2.4_Classification \| Classification]]''
		+	• ''[[ILMSimage_2.4_Miscellaneous \| Miscellaneous]]''
		+	-----

PeterS at 11:19, 15 March 2012

2012-03-15T11:19:38Z

← Older revision		Revision as of 11:19, 15 March 2012
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	The range of values of the parameter lies between 0 and 1; it has to be noted that the extreme values do not lead to meaningful results under any circumstances. The value 0.03 is a predefined modulation value which has proven to be a good starting point for cell creation for a combination of spatially more highly resolved panchromatic data and spatially more lowly resolved multi-spectral data (as they are used in the current example). This default setting can be modified by the user concerning the cell creation parameter, so that it corresponds to the typical area size which is required for the analysis. The result of a new cell creation is a raster data set which has the pixel size of the most highly resolved input data, which can be found in the project directory and ends in <code>_index</code>. As ILMSImage requires exclusive access to the corresponding file for more operations, it is not automatically loaded into the map view. For visualizing the cell creation result the option of Export as Shapefile (see below) is more suitable.		The range of values of the parameter lies between 0 and 1; it has to be noted that the extreme values do not lead to meaningful results under any circumstances. The value 0.03 is a predefined modulation value which has proven to be a good starting point for cell creation for a combination of spatially more highly resolved panchromatic data and spatially more lowly resolved multi-spectral data (as they are used in the current example). This default setting can be modified by the user concerning the cell creation parameter, so that it corresponds to the typical area size which is required for the analysis. The result of a new cell creation is a raster data set which has the pixel size of the most highly resolved input data, which can be found in the project directory and ends in <code>_index</code>. As ILMSImage requires exclusive access to the corresponding file for more operations, it is not automatically loaded into the map view. For visualizing the cell creation result the option of Export as Shapefile (see below) is more suitable.

−	~~'''~~''[[ILMSImage_2.4_Tutorial \| Overview]]''~~'''~~	+	''[[ILMSImage_2.4_Tutorial \| Overview]]'' \| '''''[[ILMSimage_2.4_Project_Settings \| Project Settings]]''''' \| ''[[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]''
−	'''''[[ILMSimage_2.4_Project_Settings \| Project Settings]]'''''	+
−	~~'''~~''[[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]~~'''~~''	+

PeterS at 11:17, 15 March 2012

2012-03-15T11:17:02Z

← Older revision		Revision as of 11:17, 15 March 2012
Line 1:		Line 1:
−	'''''[[ILMSImage_2.4_Tutorial \| Overview]]'''''	+	*'''''[[ILMSImage_2.4_Tutorial \| Overview]]'''''
−	'''''[[ILMSimage_2.4_Project_Settings \| Project Settings]]'''''	+	*'''''[[ILMSimage_2.4_Project_Settings \| Project Settings]]'''''
−	'''''[[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]'''''	+	*'''''[[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]'''''

PeterS at 11:16, 15 March 2012

2012-03-15T11:16:32Z

← Older revision		Revision as of 11:16, 15 March 2012
Line 1:		Line 1:
−	'''''[[~~ILMSimage_2~~.~~4_Project_Settings~~ \| ~~Project Settings~~]] ~~<<<~~ [[~~ILMSImage_2~~.~~4_Tutorial~~ \| ~~Overview~~]] ~~>>>~~ [[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]'''''	+	'''''[[ILMSImage_2.4_Tutorial \| Overview]]'''''
		+	'''''[[ILMSimage_2.4_Project_Settings \| Project Settings]]'''''
		+	'''''[[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]'''''


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	The range of values of the parameter lies between 0 and 1; it has to be noted that the extreme values do not lead to meaningful results under any circumstances. The value 0.03 is a predefined modulation value which has proven to be a good starting point for cell creation for a combination of spatially more highly resolved panchromatic data and spatially more lowly resolved multi-spectral data (as they are used in the current example). This default setting can be modified by the user concerning the cell creation parameter, so that it corresponds to the typical area size which is required for the analysis. The result of a new cell creation is a raster data set which has the pixel size of the most highly resolved input data, which can be found in the project directory and ends in <code>_index</code>. As ILMSImage requires exclusive access to the corresponding file for more operations, it is not automatically loaded into the map view. For visualizing the cell creation result the option of Export as Shapefile (see below) is more suitable.		The range of values of the parameter lies between 0 and 1; it has to be noted that the extreme values do not lead to meaningful results under any circumstances. The value 0.03 is a predefined modulation value which has proven to be a good starting point for cell creation for a combination of spatially more highly resolved panchromatic data and spatially more lowly resolved multi-spectral data (as they are used in the current example). This default setting can be modified by the user concerning the cell creation parameter, so that it corresponds to the typical area size which is required for the analysis. The result of a new cell creation is a raster data set which has the pixel size of the most highly resolved input data, which can be found in the project directory and ends in <code>_index</code>. As ILMSImage requires exclusive access to the corresponding file for more operations, it is not automatically loaded into the map view. For visualizing the cell creation result the option of Export as Shapefile (see below) is more suitable.
		+
		+	'''''[[ILMSImage_2.4_Tutorial \| Overview]]'''''
		+	'''''[[ILMSimage_2.4_Project_Settings \| Project Settings]]'''''
		+	'''''[[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]'''''

PeterS at 14:24, 29 February 2012

2012-02-29T14:24:58Z

← Older revision		Revision as of 14:24, 29 February 2012
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−	'''''[[ILMSimage_2.4_Project_Settings \| ~~Back to~~ Project Settings]] [[ILMSimage_2.4_Feature_Calculation \| ~~Proceed with~~ Feature Calculation]]'''''	+	'''''[[ILMSimage_2.4_Project_Settings \| Project Settings]] <<< [[ILMSImage_2.4_Tutorial \| Overview]] >>> [[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]'''''

PeterS at 14:23, 29 February 2012

2012-02-29T14:23:11Z

← Older revision		Revision as of 14:23, 29 February 2012
Line 1:		Line 1:
−	'''''[[ILMSimage_2.4_Project_Settings \| Project Settings]] ~~<<< [[ILMSImage_2.4_Tutorial \| Overview]] >>>~~ [[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]'''''	+	'''''[[ILMSimage_2.4_Project_Settings \| Back to Project Settings]] [[ILMSimage_2.4_Feature_Calculation \| Proceed with Feature Calculation]]'''''

PeterS at 14:10, 29 February 2012

2012-02-29T14:10:46Z

← Older revision		Revision as of 14:10, 29 February 2012
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−	~~==[[File: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] Cell Creation==~~
−
	'''''[[ILMSimage_2.4_Project_Settings \| Project Settings]] <<< [[ILMSImage_2.4_Tutorial \| Overview]] >>> [[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]'''''		'''''[[ILMSimage_2.4_Project_Settings \| Project Settings]] <<< [[ILMSImage_2.4_Tutorial \| Overview]] >>> [[ILMSimage_2.4_Feature_Calculation \| Feature Calculation]]'''''


		+
		+	==[[File: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] Cell Creation==

	The ''cell index'' summarizes areas with similar pixel features as "cells" in the image. Image analysis with ILMS depends completely on cells. The input panel ''Cells'' is used to control cell size and the distribution of cells with three input parameters. ''External Borders'' will ot be influenced by newky created cells.		The ''cell index'' summarizes areas with similar pixel features as "cells" in the image. Image analysis with ILMS depends completely on cells. The input panel ''Cells'' is used to control cell size and the distribution of cells with three input parameters. ''External Borders'' will ot be influenced by newky created cells.

← Older revision		Revision as of 12:23, 10 September 2012
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	==[[File: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] Cell Creation==		==[[File: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] Cell Creation==

−	The ''cell index'' summarizes areas with similar pixel features as "cells" in the image. Image analysis with ILMS depends completely on cells. The input panel ''Cells'' is used to control cell size and the distribution of cells with three input parameters. ''External Borders'' will ot be influenced by ~~newky~~ created cells.	+	The ''cell index'' summarizes areas with similar pixel features as "cells" in the image. Image analysis with ILMS depends completely on cells. The input panel ''Cells'' is used to control cell size and the distribution of cells with three input parameters. ''External Borders'' will be influenced by newly created cells.

	Main page of [[ILMSImage_2.4_Tutorial \| ILMSImage tutorial]].		Main page of [[ILMSImage_2.4_Tutorial \| ILMSImage tutorial]].
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	==Parameters==		==Parameters==

−	*'''Minimum Modulation for input''' A suitable value for the input in ''Modulation (Mean Cell Size)'' is difficult to guess, so the button ''Determine'' starts a routine that calculates the mean modulation of the selected images. The result is shown in the box left of the button. The ~~enty~~ in ''Modulation (mean Cell Size) should be considerably higher than the result in ''Minimum Modulation for Input''.	+	*'''Minimum Modulation for input''' A suitable value for the input in ''Modulation (Mean Cell Size)'' is difficult to guess, so the button ''Determine'' starts a routine that calculates the mean modulation of the selected images. The result is shown in the box left of the button. The entry in ''Modulation (mean Cell Size) should be considerably higher than the result in ''Minimum Modulation for Input''.
−	*'''Modulation (Mean Cell Size)''' is the most ~~sigificant~~ input parameter. The input determines the size of all of the resulting homogeneous areas referred as "cells" resulting from the cell creation procedure. Smaller values of ''modulation'' lead to smaller cells. Input values from 0 to 1 are defined.	+	*'''Modulation (Mean Cell Size)''' is the most significant input parameter. The input determines the size of all of the resulting homogeneous areas referred as "cells" resulting from the cell creation procedure. Smaller values of ''modulation'' lead to smaller cells. Input values from 0 to 1 are defined.
	*'''Homogeneous Cell Size''' determines the distribution of different cell sizes after the cell creation process. Small values ( 0.0 - 0.1) lead to a "natural" size distribution with highly different areas covered by a single cell. This is the normal case, but it can be useful to keep the cell size rather equal in order to carry out unusual classification tasks.		*'''Homogeneous Cell Size''' determines the distribution of different cell sizes after the cell creation process. Small values ( 0.0 - 0.1) lead to a "natural" size distribution with highly different areas covered by a single cell. This is the normal case, but it can be useful to keep the cell size rather equal in order to carry out unusual classification tasks.
−	*'''Minimum Cell ~~Sze~~''' assures that all cells ~~consihst~~ at least of the amount of ~~pixles~~ in the ~~enty~~. If cells are smaller than the entry, ILMSimage distributes their pixels equally among neighboring cells. This process is independent from image data.	+	*'''Minimum Cell Size''' assures that all cells consists at least of the amount of pixels in the entry. If cells are smaller than the entry, ILMSimage distributes their pixels equally among neighboring cells. This process is independent from image data.
	*'''Provide External Borders''' transfers all borders from the given shape to the cells. ILMSimage may add additional borders within the predestinated cells. The entry of ''External Borders'' is optional.		*'''Provide External Borders''' transfers all borders from the given shape to the cells. ILMSimage may add additional borders within the predestinated cells. The entry of ''External Borders'' is optional.

−	ILMSImage uses a tile concept to process large data layers efficiently. The maximum size of the applied tiles can be restricted by an input in '''Tilesize [MB]''' at the lower left corner of the ILMSimage ~~menue~~. Under normal conditions ILMSimage uses up to 10 tiles ~~simultainiously~~, so for 1000 MB free working ~~menory~~ an entry of "100 MB" is recommended.	+	ILMSImage uses a tile concept to process large data layers efficiently. The maximum size of the applied tiles can be restricted by an input in '''Tilesize [MB]''' at the lower left corner of the ILMSimage menu. Under normal conditions ILMSimage uses up to 10 tiles simultaneously, so for 1000 MB free working memory an entry of "100 MB" is recommended.


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	This can take some time according to the size of the test area and the selected parameters.		This can take some time according to the size of the test area and the selected parameters.

−	After the cell creation process has finished QuantumGIS shows the resulting cell borders with a semitransparent raster GIS layer. Raster layers can be visualized considerably quicker than vector layers with ~~a lot of~~ polygons. If cell creation has finished ~~sucessfully~~, ILMSimage will show the [[ILMSimage_2.4_Feature_Calculation \| feature calculation]] panel.	+	After the cell creation process has finished QuantumGIS shows the resulting cell borders with a semitransparent raster GIS layer. Raster layers can be visualized considerably quicker than vector layers with many polygons. If cell creation has finished successfully, ILMSimage will show the [[ILMSimage_2.4_Feature_Calculation \| feature calculation]] panel.

	If cell borders should be represented by shapes, the ILMSimage panel '''[Export]''' supplies tools to convert the rasterized cell index into a shape layer and show it on the QuantumGIS canvas. It is possible to smoothen the generated polygons adaptively which can be done by activating the check box ''Smooth arcs [grade]'' and ''Optimize Vertex Density''. The degree of smoothing can be determined in the input box where polygons are more strongly smoothed with increasing degree.		If cell borders should be represented by shapes, the ILMSimage panel '''[Export]''' supplies tools to convert the rasterized cell index into a shape layer and show it on the QuantumGIS canvas. It is possible to smoothen the generated polygons adaptively which can be done by activating the check box ''Smooth arcs [grade]'' and ''Optimize Vertex Density''. The degree of smoothing can be determined in the input box where polygons are more strongly smoothed with increasing degree.
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	==Modulation==		==Modulation==

−	~~This~~ term ''Modulation'' derives from the maximum contrast between neighboring pixels in the image data ([http://books.google.com/books?id=KQXNaDH0X-IC&lpg=PA147&vq=modulation&dq=MS%20Remote%20Sensing&hl=de&pg=PA146#v=onepage&q&f=true Schowengerdt, 2007]). The parameter of modulation controls the average size of emerging cells. The following relation has to considered: with increasing modulation the average size of cells increases, their number decreases accordingly, with decreasing modulation the average size of cells decreases but their number increases.	+	The term ''Modulation'' derives from the maximum contrast between neighboring pixels in the image data ([http://books.google.com/books?id=KQXNaDH0X-IC&lpg=PA147&vq=modulation&dq=MS%20Remote%20Sensing&hl=de&pg=PA146#v=onepage&q&f=true Schowengerdt, 2007]). The parameter of modulation controls the average size of emerging cells. The following relation has to be considered: with increasing modulation the average size of cells increases, their number decreases accordingly, with decreasing modulation the average size of cells decreases but their number increases.

	The range of values of the parameter lies between 0 and 1; it has to be noted that the extreme values do not lead to meaningful results under any circumstances. The value 0.03 is a predefined modulation value which has proven to be a good starting point for cell creation for a combination of spatially more highly resolved panchromatic data and spatially more lowly resolved multi-spectral data (as they are used in the current example). This default setting can be modified by the user concerning the cell creation parameter, so that it corresponds to the typical area size which is required for the analysis. The result of a new cell creation is a raster data set which has the pixel size of the most highly resolved input data, which can be found in the project directory and ends in <code>_index</code>. As ILMSImage requires exclusive access to the corresponding file for more operations, it is not automatically loaded into the map view. For visualizing the cell creation result the option of Export as Shapefile (see below) is more suitable.		The range of values of the parameter lies between 0 and 1; it has to be noted that the extreme values do not lead to meaningful results under any circumstances. The value 0.03 is a predefined modulation value which has proven to be a good starting point for cell creation for a combination of spatially more highly resolved panchromatic data and spatially more lowly resolved multi-spectral data (as they are used in the current example). This default setting can be modified by the user concerning the cell creation parameter, so that it corresponds to the typical area size which is required for the analysis. The result of a new cell creation is a raster data set which has the pixel size of the most highly resolved input data, which can be found in the project directory and ends in <code>_index</code>. As ILMSImage requires exclusive access to the corresponding file for more operations, it is not automatically loaded into the map view. For visualizing the cell creation result the option of Export as Shapefile (see below) is more suitable.