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assign1 - Assignment#1 Selecting Features Spatial Analysis...

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1 Assignment #1: Selecting Features & Spatial Analysis Preliminary Steps I § Review Gorr/Kurland, “GIS Tutorial I: Introduction”; “GIS Tutorial 4: Geodatabases”; “GIS Tutorial 5: Importing Spatial and Attribute Data” (pages 172-80); “GIS Tutorial 8: Spatial Data Processing” (pages 269-274); “GIS Tutorial 9: Spatial Analysis” (pages 303-7); and Ormsby et al., chap. 4 (“Exploring ArcCatalog”). § Peruse the following “How To” documents on the course web site: “How to Manage GIS Data Sets” and, where relevant, “ArcGIS Tips.” § If you are working on your own computer, make sure that your GIS folders are located under c:\TEMP, as described in “How to Manage GIS Data Sets.” § Use ArcCatalog, not Windows Explorer, to manage ArcGIS data files. § The following exercises will use these data layers: Mdbg (which is the Miami- Dade Block Group), Mobile Homes, Colleges, Highways, and arail. § Their common geographic coordinate system could be: Layers>Properties> Predefined>Projected Coordinate Systems>World>North American 1983 HARN (High Accuracy Reference Network). It could be more accurate to use a locally tailored projected system, such as: Layers>Properties>Coordinate System>Predefined>Projected Coordinate Systems>State Plane>NAD 1983>State Plane Florida _East_FIPS_0901). Or alternatively you could use an unprojected coordinate system: Layers> Properties>Predefined>Geographic Coordinate Systems>World>WGS 1984. o 5280 feet=1 mile, 1 mile=1.609344 kilometers. § Note that, in ArcMap, Data>Export Data saves a map layer as a shapefile to ArcCatalog. § The course web site document ‘Selecting Features’ pertains to the following exercises. II § Inspect mdbg, Lmobhome, Lcollege, and AHighway in ArcCatalog Preview, Table, and Metadata : o In Metadata, inspect the ‘Spatial Reference Information,’ particularly the geographic coordinate system). o Perhaps an easier way to inspect a coordinate system: right-click a file> Properties> Shape (click gray box)>Field Properties>Spatial Reference. Make sure that the files you intend to map share the same, appropriate coordinate system. § Define a coordinate system in ArcCatalog: o Right-click each file>Properties>Fields. Click the gray area next to ‘Shape’, then, in the ‘Field Properties’ box below, click the ellipses to the right of ‘Spatial Reference’. Then ‘Select’ or ‘Import’ a coordinate system. o Do so for mdbg as well. o Then for Lmobhome, Lcollege, and LHighway, import the coordinate system from mdbg.
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2 § In ArcMap, avoid disrupted layer paths (see “ArcGIS Tips”) by ‘storing relative path names’: o File> Map Properties>Data Source Options>click ‘store relative path names’ (see Gorr/Kurland, pages 37-38). § In ArcMap, set the appropriate coordinate system on the data frame: o Recheck the coordinate system: right-click Layers>Coordinate System, and inspect ‘Current coordinate system’.
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