spatial-analyst-tutorial.pdf

Spatial Analyst Tutorial

Spatial Analyst Tutorial

Table of Contents

About the ArcGIS Spatial Analyst Tutorial . . . . . . . . . . . . . . . . . . . . . . . . . 3

Exercise 1: Preparing for analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Exercise 2: Accessing Spatial Analyst and Data Exploration . . . . . . . . . . . . . . . . . 11

Exercise 3: Finding a site for a new school . . . . . . . . . . . . . . . . . . . . . . . . 19

Exercise 4: Finding an alternate access route . . . . . . . . . . . . . . . . . . . . . . . 47

Spatial Analyst Tutorial

About the ArcGIS Spatial Analyst Tutorial

Using the Spatial Analyst tools available with ESRI ArcGIS, you can perform spatial analysis on your data. You

can provide answers to simple spatial questions such as How steep is it at this location? and What direction is

this location facing? You can also find answers to more complex spatial questions such as Where is the best

location for a new facility? and What is the least costly path from A to B? The comprehensive set of Spatial

Analyst tools within ArcGIS allows you to explore and analyze your spatial data and enables you to find

solutions to your spatial problems. You can run tools from the Spatial Analyst toolbox or the Python Window,

accessible via any ArcGIS Desktop application. You can also create your own custom tools (models or scripts)

to run a sequence of tools at one time.

A quick tour of Spatial Analyst

Tutorial Scenario

The town of Stowe, Vermont, USA, has experienced a substantial increase in population. Demographic data

suggests this increase has occurred because of families with children moving to the region, taking

advantage of the many recreational facilities located nearby. It has been decided that a new school must be

built to take the strain off the existing schools, and as a town planner, you have been assigned the task of

finding the potential site.

This tutorial will show you how to use many of the available tools and will give you a solid basis from which

you can start to think about how to solve your own specific spatial problems.

It is assumed that you have installed ArcGIS Desktop (ArcView, ArcEditor, or ArcInfo) and the ArcGIS

Spatial Analyst extension before you begin this tutorial. If you need more information about extensions, see

Using Extensions in ArcGIS .

The data required is included on the ArcGIS Desktop CD. After running the ArcGIS setup, on the Additional

Installation Components dialog box, check to install the ArcGIS Tutorial Data. On the ArcGIS Tutorial

Data Setup wizard, check to install the Spatial Analyst data (the default installation path is

C:\arcgis\ArcTutor\SpatialAnalyst). The datasets were provided courtesy of the state of Vermont for use in

this tutorial. The tutorial scenario is fictitious, and the original data has been adapted for the tutorial.

Dataset Description

Elevation Raster dataset representing the elevation of the area

Landuse Raster dataset representing the land-use types over the area

Roads Feature class representing the linear road network for the town of Stowe

Rec_sites Feature class representing point locations of recreation sites

Schools Feature class representing point locations of existing schools

Destination Feature class representing the destination point used when finding the best route for a new road

This tutorial is divided into exercises and is designed to allow you to explore the Spatial Analyst functionality

in ArcGIS at your own pace.

• In Exercise 1, you'll prepare for analysis. You'll copy the tutorial data locally and create a

geodatabase to hold your results.

• In Exercise 2, you'll learn the location of the Spatial Analyst tools, create a hillshade output, and

explore your data.

Spatial Analyst Tutorial

• In Exercise 3, you'll create a suitability map to help you find the best location for a new school. You'll

derive datasets of distance and slope, reclassify datasets to a common scale, then weight those that

are more important to consider and combine them to find the most suitable locations. You'll then

locate the optimal site using the selection tools within ArcMap.

• In Exercise 4, you'll find the least costly route for an alternate access road to the new school site.

You will need approximately 90 minutes of focused time to complete the tutorial. Alternatively, you can

perform the exercises in sequence one at a time, saving your results along the way when recommended.

Spatial Analyst Tutorial

Exercise 1: Preparing for analysis

In this exercise, you will prepare for analysis by first copying the tutorial data

locally, then creating a geodatabase for your results.

Complexity:

Beginner

Data Requirement:

ArcGIS Tutorial Data Setup

Organizing your data

Before working with Spatial Analyst tools, you will organize your tutorial data.

Locating tutorial data

Steps:

1. Navigate to the location in your file browser where you installed the tutorial data, for

example, if you installed ArcGIS on your C:\ drive, go to C:\arcgis\ArcTutor.

2. Right-click the Spatial Analyst folder and select Copy .

3. Browse to your working directory, for example, your C:\ drive.

4. Right-click C:\ (or an alternative drive) and select Paste .

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