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Module_6: Spatial Analysis . Lesson : Spatial Datasets Analysis. Department of « Geodesy and Geoinformatics » Tajik Agrarian University named after Sh. Shotemur . Mirzoev M.M. Objectives . Data analysis Grid datasets information Future conversion Datasets function Assignment. - PowerPoint PPT Presentation
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MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
1510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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Module_6: Spatial Analysis
Lesson : Spatial Datasets Analysis
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
2510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tObjectives
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
Data analysis
Grid datasets information
Future conversion
Datasets function
Assignment
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
3510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tMap Analysis
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
Map analysis consists of inferring information – necessary for a given engineering/scientific task – from general information contained in digital spatial datasets. In map analysis with raster datasets, the digital spatial datasets consist of grids.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
4510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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Spatial Analyst
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
To enable the raster data analysis capabilities, load the Spatial Analyst ArcGIS extension by clicking Tools/ Extensions/Spatial Analyst and then Tools/Customize/ Spatial Analyst.
The Spatial Analyst adds a toolbar that contains a Spatial Analyst menu, a combo box Layer for selecting the layer, a Create contour tool and a Histogram tool.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
5510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tGrid Datasets
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
6510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
msc
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tGrid Data Structure
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
Cellular-based data structure composed of square cells of equal size arranged in rows and columns that store the value of a terrain parameter
Cells that do not store a value are assigned a NODATA code and are called NODATA cells.
Number of columns
Num
ber o
f row
s
Cell size
(x, y)
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
7510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
Type: Integer or Floating Point.Depending on the type of numbers the grid cells store, a grid is considered Integer if it stores integer values or Floating Point if it stores real values. Floating Point grids store the same information as an Integer grid but take significantly much more storage space.
Status: Permanent or Temporary.Many grids created in ArcGIS are stored as temporary files and are subject to be erased automatically. A temporary grid can be saved as a permanent grid by right-clicking on the layer name and then on Make Permanent
Grid Properties
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
8510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tValue Attribute Table
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
• Value Attribute Tables (VATs) are tables associated with grids which have two fields: Value and Count. The Value field lists all values found in the grid and the Count field lists the number of cells that have that value.
• Only Integer grids have VATs.
• VATs are created automatically for Integer grids with less than 500 unique values or with a range of values that does not exceed 100,000.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
9510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tAnalysis Extent and Cell Size
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
• Analysis Extent and Cell Size are defined for a Data Frame.
• To define the Analysis Extent and Cell Size click on Spatial Analyst/Options and then on the Extent or Cell Size tabs.
• The Analysis Mask flags the cells – within the Analysis Extent – where grid values are calculated. Outside the mask, grid cells are assigned NODATA.
• Analysis Extent defines the size of the grid rectangle.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
10510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tAnalysis Properties
• Analysis Cell Size defines the length of the cell side.
• The Number of Rows and Number of Columns are redundant if the Analysis Extent and Cell Size have been defined already.
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
If all the grids of a data frame have to be aligned and with their cells coinciding exactly, the analysis Extent and Cell Size must be set before any grids are created.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
11510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tFeature-to-Raster Conversion
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
• Point-to-grid: Each point is converted into the grid cell
where it is located. The cell value is a user-selected attribute of the point feature class.
If two points coincide in the same cell, one is chosen randomly for the cell value. Coincidence of two or more points within a cell might reflect inconsistency between the resolution of the grid and point dataset.
To convert a point dataset into a grid, click on Spatial Analyst/Convert/ Features to Raster in the Spatial Analyst toolbar.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
12510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tFeature-to-Raster Conversion
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
• Line-to-grid: Each line is converted into the grid cells with
which it intersects. The cell value is a user-selected attribute of the line dataset.
If two lines coincide in the same cell, one is chosen randomly for the cell value.
To convert a line dataset into a grid, in the Spatial Analyst toolbar click on Spatial Analyst/Convert/ Features to Raster.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
13510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
Vector-to-Raster ConversionPolygon-to-grid:
Each polygon is converted into the grid cells whose centroid it contains. The cell value is a user-selected attribute of the polygon dataset.
If two polygons coincide in the same cell (overlap), one is chosen randomly for the cell value.
To convert a polygon dataset into a grid, click on Spatial Analyst/ Convert/Features to Raster in the Spatial Analyst toolbar.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
14510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tRaster-to-Feature Conversion
Raster-to-polygon:All adjacent cells (i.e., share a side) with the same value are aggregated into a single polygon.
Grids have to be Integer grids.
The cell value is stored in an attribute Grid_Code of the polygon dataset.
Polygon outlines are smoothed to avoid jagged edges.
To convert a polygon dataset into a grid, click on the Spatial Analyst/ Convert/Raster to Features in Spatial Analyst toolbar.
Department of «Geodesy and Geoinformatics» Tajik Agrarian University named after Sh. Shotemur .Mirzoev M.M.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
15510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
msc
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tRaster Functions
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
Raster functions create output grids using input grids as arguments.
Raster functions are classified into:Local functionsFocal functionsZonal functionsGlobal functions
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
16510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tLocal Functions
The value of an output grid cell depends on the value of the cells of the input grids that have the same location. Neighbor cells have no influence on the output values.
Local functions can have one or many input grids as arguments.
Output
Inpu
t
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
17510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
msc
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tFocal Functions
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
The value of an output grid cell depends on the value of the cells of the input grids in the neighborhood.
The neighborhood can be defined in different ways.
Focal functions usually have one input grid as argument, but could have more than one. Ou
tput
Inpu
t
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
18510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
msc
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tZonal Functions
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
The value of an output grid cell depends on the value of the cells of the input grids of the same zone.
A zones grid has to be one of the function arguments.
Besides the zones grid, zonal functions usually have only one input grid as argument, but could have more than one.
Output
Inpu
t
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
19510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
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tGlobal Functions
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
The value of an output grid cell depends on the value of all the cells of the input grids.
Global functions usually have one input grid as argument, but could have more than one. Ou
tput
Inpu
t
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
20510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
msc
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Assignment
Create a vector data according raster data
To conversion vector map to raster
To generate map layout
To write a report (2-3 page)
MSc in Geoinformatics – Managing Energy, Resources, EnvironmentTeacher Training Dushanbe, 25.9. – 1.10.2011
21510978-TEMPUS-1-2010-1 This project has been funded with support from the European Commission. This document reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
msc
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?
Department of «Geodesy and Geoinformatics» Tajik Agrarian Universitynamed after Sh. Shotemur .Mirzoev M.M.
