Assignment 2: Symbolizing Maps & Computing/Editing Attribute Table Fields
Review Gorr/Kurland, “GIS Tutorial 2 Map Design”) or Ormsby et al. chap. 5
(“Symbolizing features and rasters”).
The ESRI Guide to GIS Analysis,
vol. 1; and Brewer,
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
Make sure that they share an appropriate coordinate
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.
Check for possible data errors no matter what the data source
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
mdmap1 and tgr1200sf1grp (which are block groups).
background color (Layers>Properties>Frame>Background).
Inspect the tables.
Table Joins and Relates:
Right-click mdmap1>Joins and Relates>Join (with tgr1200sf1grp,
using STFID to base the join & clicking the ‘Advanced’ option).
the joined tables by right-clicking mdmap1>Open Attribute Table.
Why did we use the ‘Advanced’ option in Table Joins and
Right-click the joined table: Data>Export data, save as ‘mdtgr1’ and
choose option to display on map.
Inspect the map.
Rename the map layer mdtgr1 ‘Miami-Dade County’.
Right-click mdmap1>Joints and Relates>Remove Joins>Remove All
Joins (so that the tables revert to their original unjoined form).
Turn off mdmap1.
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.