Spatial_Analyst_Tutorial.pdf

ArcGIS ® 9

ArcGIS Spatial Analyst Tutorial

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DATA CREDITS

Tutorial datasets: Courtesy of the state of Vermont

AUTHOR

Jill Willison

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ArcGIS Spatial Analyst Tutorial

IN THIS TUTORIAL

Using the Spatial Analyst tools available with ESRI ® ArcGIS ® , you can easily

perform spatial analysis on your data. You can provide answers to simple

spatial questions, such as how steep is it at this location? or 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? or 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 command line, accessible via any ArcGIS

Desktop application, or you can run tools from the Spatial Analyst toolbar in

ArcMap™. You can also create your own custom tools (models or scripts)

to run a sequence of tools at one time.

• Exercise 1: Preparing for analysis

Exercise 2: Finding a site for a

new school

Exercise 3: Finding an alternate

access route to the new school

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. In

ArcGIS 8, you accessed Spatial Analyst tools from the

Spatial Analyst toolbar in ArcMap. In ArcGIS 9, you can

still use the Spatial Analyst toolbar but you can also run

tools from the Spatial Analyst toolbox. You’ll access tools in

the toolbox from the ArcToolbox™ window. The

ArcToolbox window can be docked in any ArcGIS Desktop

application, meaning you can run Spatial Analyst tools in

applications such as ArcCatalog™, ArcScene™, or

ArcGlobe™.

The data required is included on the ArcGIS Desktop CD.

After running the ArcGIS setup, on the Additional Installa-

tion 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 installa-

tion path is C:\arcgis\ArcTutor\Spatial). 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.

The datasets are:

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 folder and a

geodatabase to hold your results. You’ll learn the loca-

tion of the Spatial Analyst tools, create a hillshade

output, and explore your data.

In exercise 2, 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 impor-

tant 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 3, 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.

Description

Raster dataset representing the

elevation of the area

Raster dataset representing the

land-use types over the area

Feature class representing the linear

road network for the town of Stowe

Feature class representing point

locations of recreation sites

A RC GIS S PATIAL A NALYST T UTORIAL

Exercise 1: Preparing for analysis

In this exercise, you’ll prepare for analysis by first copying

the tutorial data locally, then creating a folder and a

geodatabase for your results. You’ll locate the Spatial

Analyst tools and create a hillshade output to display

transparently with your other layers. You’ll explore your

input data and open the ArcToolbox window. This exercise

will take approximately 15 minutes to complete.

Locating the tutorial data

By connecting to a folder in ArcCatalog, you can quickly

see the folders and data sources it contains. You’ll now

begin organizing your tutorial data by establishing a folder

connection to its location.

1. Click the Connect To Folder button.

Organizing your data

Before working with Spatial Analyst tools, you’ll organize

your tutorial data using ArcCatalog.

Starting ArcCatalog

1. Start ArcCatalog by either double-clicking a shortcut

installed on your desktop or using the Programs list On

the Start menu.

2. Type the pathname or navigate to the location where you

installed the tutorial data; for example, if you installed

ArcGIS on your C:\ drive, type

“C:\arcgis\ArcTutor\Spatial”, then click OK to establish

a folder connection.

A RC GIS S PATIAL A NALYST T UTORIAL

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