Spatial analyst

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GIS Special Topics Workshop: Using the Spatial Analyst Extension

Rhonda Houser, Academic Data Research Services Alliance, KU Libraries Instructional Services www.ku.edu/~adrsa

Contents Introduction.................................................................................................... 2Objectives...................................................................................................... 2 Related Training Available ............................................................................ 2 Definitions...................................................................................................... 2 For More Information................................................................................... 12 Getting Additional Help............................................................................... 13
© 2006 University of Kansas. All rights reserved

ADRSA Training: Using the Spatial Analyst Extension

Introduction
Delve into the nitty gritty of ArcMap using tools available through the Spatial Analyst extension. This tool provides cell-based modeling and analysis functions for working with raster data in GIS. Create, examine andcombine grid data, and learn about differences between vector and raster data. Calculate and examine distance, density, and cost relationships.

Objectives
Turn on Spatial Analyst extension and toolbar Convert data from vector to raster format Set analysis parameters Differentiate between temporary and permanent grids Generate distance grids (calculate distance to nearest feature) Generatedensity grids (calculate concentration of features) Reclassify grid data Add class labels to ranges of grid values Combine grids using grid calculator Export grid table to another format Calculate grid areas

Prerequisites
GIS I: ArcMap Introduction and GIS II: ArcMap Intermediate, or equivalent skills

Related Training Available
All workshops offered through Information Services are free to KUstudents, staff, faculty, and approved affiliates. To learn more about or register for workshops, receive automatic announcements of upcoming workshops, and track workshops you registered for and attended, visit the KU Libraries Instructional Services Web site at http://www.lib.ku.edu/instruction/. You can also check our online schedule at www.ku.edu/acs/schedule for a list of class offerings andavailability. For further workshop related questions, please email training@ku.edu.

Definitions
Term cell count Definition column in raster attribute table; indicates number of cells having a particular value. column in raster attribute table; identifies or describes cell class, category or group for discrete/thematic data using whole numbers (integer data), or identifies or describes cellmagnitude, distance or relationship of cell to other cells for continuous surfaces using decimal numbers (floating point data). database file format (*.dbf), the file format produced by Dbase, a commercial relational database system; .dbf files comprise the tabular
- © 2006 The University of Kansas 2

cell value

dbase (dbf)

ADRSA Training: Using the Spatial Analyst Extension

data file inGIS shapefiles and can be imported as tables into ArcGIS. extension tool or program that adds functionality to ArcView; a standard set of extensions accompany GIS software; they can also be obtained from a software vendor such as ESRI, and many are freely available online from users who develop them based on their needs. same calculation method as simple density except lines nearer the center of acell’s search area (closer to cell itself) are weighted more heavily, resulting in smoother distribution of values. click and drag to start measuring distances on the map; double-click to stop; distance is simultaneously displayed at the bottom left of the data frame (both ‘Segment’ and ‘Total’ distance are shown) value assigned to a cell when either no or insufficient information is available...
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