Lab 12 Raster analysis

# Lab 12 Raster analysis - 44:005 Foundations of GIS Lab 12...

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44:005 Foundations of GIS Lab 12: Raster Analysis In previous labs you have digitized raster data and used it as a backdrop on maps. Because spatial reference information is stored with raster datasets, they can also be used to perform spatial analyses. Refer to lecture notes and Chapter 10 of the textbook for information about Map Algebra and raster analyses in general. You will be using a set of tools grouped under the Spatial Analyst extension to perform a site suitability analysis. Warning: A lot of files will be created over the course of this lab. Use sensible file names and note them down in this handout to avoid confusion. If you run out of space in your student folder, you can delete mxd files from the beginning of the semester as they take up the most space. This lab walks you through a simple raster analysis to determine habitat suitability for a plant or animal. The specific environmental factors you will be working with are: distance to nearest river, slope and soil water retention. The final output raster will show how suitable each pixel is for the plant/animal. Overview of the exercise… Describe a suitable habitat for your plant/animal Load the Spatial Analyst extension and toolbar Set up the study area Calculate distance to river Calculate slope Calculate soil water retention Compute a suitability index Description of plant/animal and habitat: First you need to determine what type of habitat will be suitable for your chosen plant/animal using a combination of three layers: soil moisture level, distance to nearest river, and slope. What you need to think about: Do you need to be within a certain distance of the river or is it better to be further away? Do you need to be on flat land or is steep terrain more suitable? How much soil moisture is ideal? Go ahead and answer question 1 at the end. 44:005 Lab 12 Raster Analysis Pg 1 of 7

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1. In order to avoid problems work on either the D drive or a USB/Portable drive. If you work on the D drive at the end of the day move all files to the S drive. Make sure there are no spaces anywhere in the path names. 2. Copy major_rivers.shp, IA_soils.shp, IACounties.shp and IA_DEM.img to a folder on the D drive. Add them to a new ArcMap document. Load the Spatial Analyst extension and toolbar 3. Load Spatial Analyst extension: Tools Extensions Check Spatial Analyst. Take a quick look at An Overview of Spatial Analyst in the help menu. This document lists some common spatial analyses that can be performed with these tools. In this lab you will be deriving slope from a DEM, finding the most suitable location and performing a distance analysis. These tools are accessed through the Spatial Analyst Toolbar . 4.
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Lab 12 Raster analysis - 44:005 Foundations of GIS Lab 12...

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