u.s. census data options for downloading and importing data into arcmap treg christopher oct 31,...
Post on 14-Jan-2016
222 Views
Preview:
TRANSCRIPT
U.S. Census Data U.S. Census Data Options for downloading and importing
data into ArcMap
Treg ChristopherOct 31, 2008
Types of Census DataTypes 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
◦ SF2:Similar info as SF1 but detailed for each of 200+ ethnicities Guide for finding specific info:
http://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&_l
ang=en
◦ SF4:Similar info as SF3 but detailed for many ethnicities Community Surveys Economic Surveys
Census Geographic FilesCensus 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
◦ 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 3rd 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 info
Census UnitsCensus 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
Data Sources for Census Data Sources for Census DataDataESRI Geography Network
◦http://www.esri.com/data/download/census2000_tigerline/index.html
Federal GIS Clearinghouse ◦http://gos2.geodata.gov
Vermont Spatial Data (at VCGI)◦http://www.vcgi.org/
U.S. Census◦American Factfinder at
www.census.gov
ESRI Geography NetworkESRI Geography Network
Project WorkspaceProject Workspace
Census SF1 Table
Census Shapefile
Joining Tables to Joining Tables to ShapefilesShapefiles
Download data for
entire state
Download data for AOI
(Area of Interest)
VCGI Data for Entire StateVCGI Data for Entire State
VCGI Custom SelectionVCGI Custom Selection
VCGI Custom Selection of B-VCGI Custom Selection of B-tonton
Data from Data from www.census.govwww.census.gov
or
Table Types in ArcMapTable Types in ArcMapTables 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
Import CSV file into Excel or Import CSV file into Excel or AccessAccess
Can usually skip this page unless Excel sets wrong
data type
ID showing
as # instead of text
Boundary Files from Boundary Files from www.census.govwww.census.gov
Don’t use these..they have
generalized boundaries
(explained at: http://www.census.gov/ge
o/www/cob/scale.html )
Appending Census Appending Census BoundariesBoundaries
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
Comments for ProjectsComments for ProjectsIndices at:
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
top related