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# Spatial Analysis Based on Raster Data Processing

STEP-BY-STEP

____ Open your Fast Facts File.
____ Open the Color Figures file.
Exercise 8-1 (Project)
Basic Raster Principles and Operations
____ 1. Start ArcCatalog. Make a folder named Raster_Experiments in your
___IGIS-Arc_YourInitials
folder. Make a folder connection to that folder. Now make a File Geodatabase named Ras_Expr.gdb inside that folder. Also make sure that the Spatial Analyst extension is turned on (You will also have to turn it on in ArcMap later.)
First, let’s create a tiny, trivial, basic raster to work with. There are several ways to create a raster. We could create a point shapefile, as we did in the project where we mapped the computer terminals, and then convert that to a raster. We will do that in a future project. Another method would be to use the ASCII to Raster tool (in ArcToolbox > Conversion Tools > To Raster). This needs a text file, which we will create. (When I say “we” will use a certain tool you have, of course, noted that I make the suggestions and you do the work.)
____ 2. Using a text processor, make a text file as shown in the lines of characters that follow. Call the text file Forty_Two_Cells.txt and save it in the Raster_Experiments folder.
``NCOLS 7``
``NROWS 6``
``XLLCENTER 4150``
``YLLCENTER 1150``
``CELLSIZE 100``
``NODATA_VALUE -32768``
``21 22 21 23 23 23 23``
``21 25 25 25 25 25 25``
``21 25 23 23 23 24 24``
``29 27 25 23 23 26 26``
``25 27 29 26 27 23 23``
``27 27 27 21 21 23 23``
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