ILMSImage Cell Creation - Revision history

DanielS at 10:53, 7 January 2012

2012-01-07T10:53:32Z

← Older revision		Revision as of 10:53, 7 January 2012
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	[[de:ILMSImage_Cell_Creation]]		[[de:ILMSImage_Cell_Creation]]
−	[[pt:~~ILMSImage_Criação_de_Célula~~]]	+	[[pt:ILMSImage_Cell_Creation]]
	=[[File: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] ILMSImage Cell Creation=		=[[File: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] ILMSImage Cell Creation=

DanielS at 10:34, 7 January 2012

2012-01-07T10:34:18Z

← Older revision		Revision as of 10:34, 7 January 2012
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	[[de:ILMSImage_Cell_Creation]]		[[de:ILMSImage_Cell_Creation]]
		+	[[pt:ILMSImage_Criação_de_Célula]]
	=[[File: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] ILMSImage Cell Creation=		=[[File: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] ILMSImage Cell Creation=

Chr at 08:12, 5 December 2011

2011-12-05T08:12:13Z

← Older revision		Revision as of 08:12, 5 December 2011
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	[[de:ILMSImage_Cell_Creation]]		[[de:ILMSImage_Cell_Creation]]
−	=[[~~Bild~~: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] ILMSImage Cell Creation=	+	=[[File: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] ILMSImage Cell Creation=

	==Introduction==		==Introduction==
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	The panel consists of two components. In the upper part the current project is summarized under the title ''ILMSImage Project Information''. The rest of the panel is the actual functionality, in this case the derivation of statistically homogeneous image areas which are called cells in the context of ILMSImage. This division into two parts, project information and tools, also exists in other panels of the ILMSImage GUI plug-in.		The panel consists of two components. In the upper part the current project is summarized under the title ''ILMSImage Project Information''. The rest of the panel is the actual functionality, in this case the derivation of statistically homogeneous image areas which are called cells in the context of ILMSImage. This division into two parts, project information and tools, also exists in other panels of the ILMSImage GUI plug-in.

−	[[~~Bild~~:ilms_img_qgis_work_10.png\|Das Zellbildungs-Panel des ILMSImage-Plugins für QuantumGIS]]	+	[[File:ilms_img_qgis_work_10.png\|Das Zellbildungs-Panel des ILMSImage-Plugins für QuantumGIS]]

	==Part 1: Information==		==Part 1: Information==
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	The information which is summarized in the information section consists of the project name (1) and the data sources which have been used in the project and their identifiers (2) - assigned in the ILMSImage setup panel.		The information which is summarized in the information section consists of the project name (1) and the data sources which have been used in the project and their identifiers (2) - assigned in the ILMSImage setup panel.

−	[[~~Bild~~:ilms_img_qgis_work_11.png\|Informationen zu einem ILMSImage-Projekt]]	+	[[File:ilms_img_qgis_work_11.png\|Informationen zu einem ILMSImage-Projekt]]

	==Part 2: Cell Creation==		==Part 2: Cell Creation==
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	#'''Export cells as shapefile''': After the cell creation has been completed, it is possible to export the result as a shapefile and to visualize it on the map surface. This process can be modified in several aspects.		#'''Export cells as shapefile''': After the cell creation has been completed, it is possible to export the result as a shapefile and to visualize it on the map surface. This process can be modified in several aspects.

−	[[~~Bild~~:ilms_img_qgis_work_12.png\|Einstellungen zur ILMSImage-Zellbildung]]	+	[[File:ilms_img_qgis_work_12.png\|Einstellungen zur ILMSImage-Zellbildung]]

	===Activating the Cell Creation===		===Activating the Cell Creation===
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	By clicking on ''Create and/or visualize cells'' the selected operations are carried out. This can take some minutes according to the size of the test area and the selected parameters. The completion of the processes is indicated by information boxes.		By clicking on ''Create and/or visualize cells'' the selected operations are carried out. This can take some minutes according to the size of the test area and the selected parameters. The completion of the processes is indicated by information boxes.

−	[[~~Bild~~: ilms_img_qgis_work_13.png\|Dialoge zur Information über Beendigung der Zellbildung]]	+	[[File: ilms_img_qgis_work_13.png\|Dialoge zur Information über Beendigung der Zellbildung]]

	If the export of vector data has been activated, the corresponding data sets are automatically loaded after the completion has been confirmed. The cell index is now to be considered in the form of vectors and it can be modified by changing parameters or assumed for subsequent analyses. It has to be noted that generally only one cell creation result is available, i.e. for the recovery of a previous cell index the index has to be generated with identical parameters. There is no function which automatically leads to a previous result. This limitation does not apply for exported vector data, as long as different file names were indicated for the export.		If the export of vector data has been activated, the corresponding data sets are automatically loaded after the completion has been confirmed. The cell index is now to be considered in the form of vectors and it can be modified by changing parameters or assumed for subsequent analyses. It has to be noted that generally only one cell creation result is available, i.e. for the recovery of a previous cell index the index has to be generated with identical parameters. There is no function which automatically leads to a previous result. This limitation does not apply for exported vector data, as long as different file names were indicated for the export.

−	[[~~Bild~~: ilms_img_qgis_work_14.png\|800px\|Zellindex als Vektordatenlayer über Originaldaten]]	+	[[File: ilms_img_qgis_work_14.png\|800px\|Zellindex als Vektordatenlayer über Originaldaten]]

	==Following Steps==		==Following Steps==

	After cell creation a typical ILMSImage process chain with derivation and calculation of cell attributes continues by using the panel [[ILMSImage_Attribute_Calculation\|ILMSImage Attribute Calculation]].		After cell creation a typical ILMSImage process chain with derivation and calculation of cell attributes continues by using the panel [[ILMSImage_Attribute_Calculation\|ILMSImage Attribute Calculation]].

Chr: /* Following Steps */

2011-11-30T17:06:13Z

Following Steps

← Older revision		Revision as of 17:06, 30 November 2011
Line 78:		Line 78:
	==Following Steps==		==Following Steps==

−	After cell creation a typical ILMSImage process chain with derivation and calculation of cell attributes continues by using the panel [[~~ILMSImage_Attribute_Calculation_english~~\|ILMSImage Attribute Calculation]].	+	After cell creation a typical ILMSImage process chain with derivation and calculation of cell attributes continues by using the panel [[ILMSImage_Attribute_Calculation\|ILMSImage Attribute Calculation]].

Chr at 15:57, 28 November 2011

2011-11-28T15:57:09Z

← Older revision		Revision as of 15:57, 28 November 2011
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		+	[[de:ILMSImage_Cell_Creation]]
	=[[Bild: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] ILMSImage Cell Creation=		=[[Bild: ilms_img_cells_icon.png\|50px\|<span title=""></span>]] ILMSImage Cell Creation=

Chr: hat „ILMSImage Cell Creation english“ nach „ILMSImage Cell Creation“ verschoben

2011-11-28T15:32:20Z

hat „ILMSImage Cell Creation english“ nach „ILMSImage Cell Creation“ verschoben

← Older revision

Revision as of 15:32, 28 November 2011

Chr: /* Background */

2011-09-01T08:09:42Z

Background

← Older revision		Revision as of 08:09, 1 September 2011
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	===Background===		===Background===

−	The derivation of statistically homogeneous image areas is a '''key process in object-based image analysis'''. It is based on the assumption that the data material of modern remote sensing sensors which is getting more complex due to increasing data density cannot be analyzed adequately because pixels from common image analysis are used as a reference. As an alternative, object-based image analysis offers the creation of new areas as a basis for subsequent analysis. This process is often called '''segmentation''' and, in the context of ILMSImage as '''cell creation'''. It summarizes neighboring pixels on the basis of statistical similarities to areas (cells) which are as homogeneous as possible. This process does not only represent reduction of complexity of extensive input data but it also offers a new perspective on those data by providing new features (which are only rarely used in image analysis) for subsequent analysis. One of those features is, for example, the form of a cell or its spatial context which contains, among other things, the relation to the neighboring cells. Features for form and context are perceived as subordinate features in pixel-based analysis of remote sensing data due to the uniformity of the area, mostly the rectangular pixel.	+	The derivation of statistically homogeneous image areas is a '''key process in object-based image analysis'''. It is based on the assumption that the data material of modern remote sensing sensors, which is getting more complex due to increasing data density, cannot be analyzed adequately because pixels from common image analysis are used as a reference. As an alternative, object-based image analysis offers the creation of new areas as a basis for subsequent analysis. This process is often called '''segmentation''' and, in the context of ILMSImage as '''cell creation'''. It summarizes neighboring pixels on the basis of statistical similarities to areas (cells) which are as homogeneous as possible. This process does not only represent reduction of complexity of extensive input data but it also offers a new perspective on those data by providing new features (which are only rarely used in image analysis) for subsequent analysis. One of those features is, for example, the form of a cell or its spatial context which contains, among other things, the relation to the neighboring cells. Features for form and context are perceived as subordinate features in pixel-based analysis of remote sensing data due to the uniformity of the area, mostly the rectangular pixel.

	For the segmentation process, i.e. the derivation of such reference areas from images, various suggestions and methods are provided in the corresponding literature. Some of them are summarized in [http://www.sciencedirect.com/science/article/pii/S0734189X85901537 Haralick & Shapiro (1985)], [http://www.sciencedirect.com/science/article/pii/003132039390135J Pal & Pal (1993)] and [http://www.springerlink.com/content/311jw5m3a1fr6a4w/ Freixenet et al. (2002)]. For a basic understanding of ILMSImage it is sufficient to know that the cell creation process used in the software is based on a combination of the methods Region Growing and Watershed Analysis. It was developed with the aim to minimize the degrees of freedom which are available to the user for adaption. For an exact application of the method more detailed options are available. The result of the cell creation using ILMSImage is a first abstraction of the original image content, all other analyses are carried out using this cell image.		For the segmentation process, i.e. the derivation of such reference areas from images, various suggestions and methods are provided in the corresponding literature. Some of them are summarized in [http://www.sciencedirect.com/science/article/pii/S0734189X85901537 Haralick & Shapiro (1985)], [http://www.sciencedirect.com/science/article/pii/003132039390135J Pal & Pal (1993)] and [http://www.springerlink.com/content/311jw5m3a1fr6a4w/ Freixenet et al. (2002)]. For a basic understanding of ILMSImage it is sufficient to know that the cell creation process used in the software is based on a combination of the methods Region Growing and Watershed Analysis. It was developed with the aim to minimize the degrees of freedom which are available to the user for adaption. For an exact application of the method more detailed options are available. The result of the cell creation using ILMSImage is a first abstraction of the original image content, all other analyses are carried out using this cell image.

Chr: /* Introduction */

2011-07-25T15:07:10Z

Introduction

← Older revision		Revision as of 15:07, 25 July 2011
Line 3:		Line 3:
	==Introduction==		==Introduction==

−	''ILMSImage Cell Creation'' is part of the [[Tutorial_ILMSImage#ILMSImage_Plug-in_for_QuantumGIS\|ILMSImage ~~plugin~~ for QuantumGIS]] and there, it is used for cell creation with selected input data and further optional parameters.	+	''ILMSImage Cell Creation'' is part of the [[Tutorial_ILMSImage#ILMSImage_Plug-in_for_QuantumGIS\|ILMSImage plug-in for QuantumGIS]] and there, it is used for cell creation with selected input data and further optional parameters.

	The panel consists of two components. In the upper part the current project is summarized under the title ''ILMSImage Project Information''. The rest of the panel is the actual functionality, in this case the derivation of statistically homogeneous image areas which are called cells in the context of ILMSImage. This division into two parts, project information and tools, also exists in other panels of the ILMSImage GUI plug-in.		The panel consists of two components. In the upper part the current project is summarized under the title ''ILMSImage Project Information''. The rest of the panel is the actual functionality, in this case the derivation of statistically homogeneous image areas which are called cells in the context of ILMSImage. This division into two parts, project information and tools, also exists in other panels of the ILMSImage GUI plug-in.

Chr: /* Following Steps */

2011-07-25T13:18:00Z

Following Steps

← Older revision		Revision as of 13:18, 25 July 2011
Line 77:		Line 77:
	==Following Steps==		==Following Steps==

−	After cell creation a typical ILMSImage process chain with derivation and calculation of cell attributes continues by using the panel [[ILMSImage Attribute Calculation]].	+	After cell creation a typical ILMSImage process chain with derivation and calculation of cell attributes continues by using the panel [[ILMSImage_Attribute_Calculation_english\|ILMSImage Attribute Calculation]].

Chr: /* Weiteres Vorgehen */

2011-07-25T13:16:49Z

Weiteres Vorgehen

← Older revision		Revision as of 13:16, 25 July 2011
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	[[Bild: ilms_img_qgis_work_14.png\|800px\|Zellindex als Vektordatenlayer über Originaldaten]]		[[Bild: ilms_img_qgis_work_14.png\|800px\|Zellindex als Vektordatenlayer über Originaldaten]]

−	==~~Weiteres Vorgehen~~==	+	==Following Steps==

−	~~Nach der Zellbildung setzt sich eine typische~~ ILMSImage~~-Prozesskette mit der Ableitung und Berechnung von Zellattributen mittels des Panels~~ [[ILMSImage Attribute Calculation]] ~~fort~~.	+	After cell creation a typical ILMSImage process chain with derivation and calculation of cell attributes continues by using the panel [[ILMSImage Attribute Calculation]].