Mapping Data with Uncertainty:Introduction to the ArcGIS Extension

Lisa Neidert & Sherry Briske

February 1, 2012PSC Data WorkshopAnn Arbor, MI

Synopsis of Mini-workshop

ACS data are noisy http://www.psc.isr.umich.edu/dis/acs/aggregator/

ArcGIS extension http://gesg.gmu.edu/census/index.htm Tool that allows one to map geographic variation in a

characteristic & show data quality or test for differences

ArcGIS Or do by hand via layers

Purpose of ArcGIS Extension

Mapping ACS Estimates with CV

Identifying Areas with Significant Differences Selected unit vs all other Several units vs all other Fixed value with all

Details for Workshop

Loaded on PSC Library Computers Available once ArcGIS is invoked

Data & Shapefile requirements http://www.psc.isr.umich.edu/dis/workshop/Download_ACS_Instruction_inTable.pdf

Guide to ArcGIS Extension http://www.psc.isr.umich.edu/Documentation.pdf

Instructional Area [Copy directory contents] T:\sb\workshop

For Later [Installation instructions for your PC/laptop]

http://gesg.gmu.edu/census/readme.pdf

ArcGIS Extension

Invoke ArcGIS

Everything happens within ACS Mapping Tool Join shapefile & data table Choose procedure

Need to save as layer package To modify symbology, etc.

ArcMap: Open empty table

Tools/Extensions

Extensions/ACS Mapping Extension

View/ACSMapping

ACS Mapping is now accessible

ACS Mapping: Choices

Merging Input Files

Goes to Default Directory

Go to your working directory

Highlight join files

Identify keys & Add layer

Overlay Item with CV

Mapping Data Reliability

Define Variables and MoE

Accept/Modify Symbology

Create Layer Package

Questions/Comments

E-mail lisan@umich.edu