Introductory Exercises for GIS Using ArcMap & ArcCatalog

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Using the Union FunctionYou will now use the union function to create a new layer of the buffered areas and the farmland soils.From the toolbox display, chose “Analysis Tools”, then “Overlay”, then “Union”.Select Aggregate Farmland and Buffered Roads from the Input Features dropdown list. As usual,the Output Feature Class is automatically determined and can be changed of desired.Leave all other defaults and click “OK” to run the tool. The result will be automatically be addedto the project.Rename the new layer “Union of Roads and Farmland” and change the display to reflect Prime andNot Prime Farmland as done previously.Using the zoom tool, display an area so that you can clearly see the results of the Union function.26
You have now identified the most suitable land for farming and the land within 200 feet of the roads.With such a close proximity to the roads, this land could contain contaminates such as motor oil,gasoline and other automotive pollutants. Thus, the most suitable farmland would be that which isclassified as prime farmland and located 200 feet from the roads. Here we are going to select portions ofthe layer to show only the features that we feel are desirable. From the “Selection” menu, chose “Select by Attributes” Chose “Union of Roads and Farmland” from the Layers dropdown menu and select “Create newselection” from the “Method” dropdown list. Double click on " "FID_CT_Roa" from the list of available fields. This name will appear in thelower display box. Click “Get Unique Values” to see the available values that can be selected upon. Click the “=”button, then double click “-1” to indicate that you want to select areas outside of the buffer area. Click “AND” to add another selection criterion Double click “FARMLAND” to add it to the lower display box, then click “Get Unique Values”again. Select “=”, then “PRIME FARMLAND” to indicate we want to identify only areas ofprime farmland outside of the buffer area. Click “OK” to run the tool. The selected areas will be outlined in blue in the map display.Create a new layer from the selected features (hint: right click on the Union of Roads andFarmland layer name in the table of contents to begin, see Part I). Convert this new layer to ashapefile and add it to the map manually (hint: use a Conversion Tool, see Part I).Rename the new shapefile to “Prime Farmland 200 feet from Roads” and change the display torepresent Prime Farmland outside of the 200 foot road buffer in yellow. Since the yellow may bedifficult to see on a white background, add a grey outline of weight equal to 1.Turn on the Middlefield polygon you extracted in Part I. Change the display to no color for the filland a grey outline.27
Page 1 and 2: Introductory Exercises for GIS Usin
Page 3 and 4: Now scroll to the section labeled
Page 5 and 6: Using ArcCatalogArcGIS shapefiles c
Page 7 and 8: Click “Add”, then “OK, then
Page 9 and 10: Navigate to the correct directory a
Page 11 and 12: Notice that ArcMap asks whether you
Page 13 and 14: In the toolbox window, select “Co
Page 15 and 16: There are several lakes found throu
Page 17 and 18: Click on the edge of Beseck Lake in
Page 19 and 20: Part II: Locating Prime Farmland in
Page 21 and 22: Prime Farmland Soils Prime Farmlan
Page 23 and 24: You have now located and effectivel
Page 25: Choose Aggregated Farmland and Buff
Page 29: Each element can be edited individu

Introductory Exercises for GIS Using ArcMap & ArcCatalog

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