assign2 - Assignment 2 Symbolizing Maps Computing/Editing...

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1 Assignment 2: Symbolizing Maps & Computing/Editing Attribute Table Fields Preliminary Steps § Review Gorr/Kurland, “GIS Tutorial 2 Map Design”) or Ormsby et al. chap. 5 (“Symbolizing features and rasters”). § See Mitchell, The ESRI Guide to GIS Analysis, vol. 1; and Brewer, Designing Better Maps: A Guide for GIS Users . § In ArcCatalog, preview mdmap1 (table, geography); examine its metadata (especially ‘Spatial Reference Information’); and click preview (to inspect its table) tgr1200sf1grp. Make sure that they share an appropriate coordinate system. § In ArcCatalog, Excel, STATA, SPSS, or other statistical software, always check the data for possible errors : e.g., add up “Race” categories and gender categories to make sure that they sum to the field for total population, and housing tenure categories to make sure they sum to the field for total housing units. o Check for possible data errors no matter what the data source may be . o Check published errata (e . g., U.S. Census errata). § In ArcMap, set to store relative path names, set the appropriate coordinate system, and check the display units. I: Add Data, Join Tables, & Eliminate Unpopulated Districts § ‘Add Data’ : mdmap1 and tgr1200sf1grp (which are block groups). Select a background color (Layers>Properties>Frame>Background). o Inspect the tables. § Table Joins and Relates: o Right-click mdmap1>Joins and Relates>Join (with tgr1200sf1grp, using STFID to base the join & clicking the ‘Advanced’ option). Inspect the joined tables by right-clicking mdmap1>Open Attribute Table. § Why did we use the ‘Advanced’ option in Table Joins and Relates? o Right-click the joined table: Data>Export data, save as ‘mdtgr1’ and choose option to display on map. Inspect the map. Inspect the attribute table. o Rename the map layer mdtgr1 ‘Miami-Dade County’. o Right-click mdmap1>Joints and Relates>Remove Joins>Remove All Joins (so that the tables revert to their original unjoined form). o Turn off mdmap1. o In mdtgr1, Right-click ‘POP2000’ in attribute table>Sort ascending. Are there any census block groups with population less than, say, 100? If so, select them in the attribute table (by clicking on their gray squares on the table’s left-hand side) and explore them on the map.
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2 o Eliminate the block groups with population=0: Selection (mdtgr1)>Select by attributes>Select if POP2000=0. Open attribute table: Show>Selected. Inspect the attribute table. Inspect the map. Close the attribute table. § Right-click mdtgr1: Selection>Switch selection (so that only areas with POP2000>0 display). We selected POP2000=0 and then did Selection>Switch Selection to learn this sometimes useful procedure. What would have been a simpler approach? o Open attribute table: Show>Selected. Inspect the attribute table.
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