1. U.S. Census Data Options for downloading and importing data into ArcMap Treg Christopher Oct 31, 2008

2. Types of Census Data Decennial Census ◦ SF1:Sex,Age,Race,Hshld income, size  Info for each field at: http://factfinder.census.gov/servlet/MetadataBrowserServlet?type=dataset&id=DEC_2000_SF1_U&_lang=en http://factfinder.census.gov/servlet/MetadataBrowserServlet?type=dataset&id=DEC_2000_SF1_U&_lang=en ◦ SF2:Similar info as SF1 but detailed for each of 200+ ethnicities  Guide for finding specific info: http://ssdc.ucsd.edu/ssdc/cen2k/raceguide.pdfhttp://ssdc.ucsd.edu/ssdc/cen2k/raceguide.pdf ◦ SF3:Long form…intensive info from a sample of people from each Block  http://factfinder.census.gov/servlet/MetadataBrowserServlet?type=dataset&id=DEC_2000_SF3_U&_lang=en http://factfinder.census.gov/servlet/MetadataBrowserServlet?type=dataset&id=DEC_2000_SF3_U&_lang=en ◦ SF4:Similar info as SF3 but detailed for many ethnicities Community Surveys Economic Surveys

3. Census Geographic Files TIGER (Topologically Integrated Geographic Encoding and Referencing ) ◦ Source:  Variety of sources but mainly from1:100,000 USGS topo maps ◦ Positional Accuracy (Horizontal):  National Map Accuracy standards for 1:100k is approx +/- 167 feet  Relationship betw/ scale and acuuracy: http://www.tceq.state.tx.us/gis/natmap.html http://www.tceq.state.tx.us/gis/natmap.html ◦ Most sources have already converted these TIGER files into a more usable format (e.g. shapefiles)  If not:  Use Toolbox in ArcMap (Need ArcInfo workstation installed)  Use a 3 rd Party conversion software ◦ Refer to: http://www.census.gov/geo/www/tiger/overview.html and http://www.census.gov/geo/www/tiger/faq-index.html for more infohttp://www.census.gov/geo/www/tiger/overview.html http://www.census.gov/geo/www/tiger/faq-index.html

4. Census Units Block Group ID: 12 Digits= State (2) + County (3) + Tract (6) + BG (1) So you can always aggregate data and analyses from the single BG ID

5. Data Sources for Census Data ESRI Geography Network ◦ http://www.esri.com/data/download/census20 00_tigerline/index.html http://www.esri.com/data/download/census20 00_tigerline/index.html Federal GIS Clearinghouse ◦ http://gos2.geodata.gov http://gos2.geodata.gov Vermont Spatial Data (at VCGI) ◦ http://www.vcgi.org/ http://www.vcgi.org/ U.S. Census ◦ American Factfinder at www.census.govwww.census.gov

6. ESRI Geography Network

7. Project Workspace Census SF1 Table Census Shapefile

8. Joining Tables to Shapefiles

9. Download data for entire state Download data for AOI (Area of Interest)

10. VCGI Data for Entire State

11. VCGI Custom Selection

12. VCGI Custom Selection of B-ton

13. Data from www.census.gov or

17. Table Types in ArcMap Tables can be added to ArcMap if they are: ◦ Dbf files ◦ From a database (e.g. Access)  (Doesn’t have to be an ESRI personal geodatabase) DBF not available in Office 2007! ◦ Import xls or csv file directly into Access ◦ Import xls or csv file into Open Office and save as dbf

18. Import CSV file into Excel or Access Can usually skip this page unless Excel sets wrong data type ID showing as # instead of text

19. Boundary Files from www.census.gov Don’t use these..they have generalized boundaries (explained at: http://www.census.gov/geo/www/ cob/scale.html ) http://www.census.gov/geo/www/ cob/scale.html

20. Appending Census Boundaries What to do if you want a single, large coverage from multiple, smaller areas ◦ Copy the largest GIS file (shapefile,pgdb,file gdb) and rename (e.g. “MasterCensusBnd”) ◦ Use the Append command in ArcMap to merge these multiple files

21. Comments for Projects Indices at: http://www.census.gov/hhes/www/housing /housing_patterns/app_b.html http://www.census.gov/hhes/www/housing /housing_patterns/app_b.html Panel/Longitudinal Study? ◦ i.e. how something changes over time? ◦ Be aware that the actual boundaries (and the unit ID ) may change between censuses