RSEI Data Dictionary: Geographic Microdata Shapefiles for Other Geographies

The following tables provide descriptions for each field in each table. Note that for the Geographic Microdata, "Other Geographies" includes block groups, census tracts, and ZIP code files.  For more information, see the RSEI methodology document and the RSEI Microdata documentation. 

Geographic Microdata shapefiles files include the same data as the disaggregated files, but the chemical releases are summed over each geographic unit (block group, census tract or ZIP code) and the data are presented in a shapefile format for use with GIS programs. Because the values are summed, unweighted concentrations are not available (the sum of the concentrations of different chemicals would be meaningless). These files contain the same data as the aggregated Geographic Microdata for other geographies. For user convenience a comma delimited text file is also included in each zip file; that text file is the same as the text file for the aggregated Microdata. 

Naming: The zipped files are named as follows, where XXXX is the reporting year for the data freeze, and YYYY is the year of the data contained in the file .  

• Block group: censusmicroblockgroupXXX_YYYY_aggregated.zip
• Census tract: censusmicrotractsXXX_YYYY_aggregated.zip
• ZIP codes: censusmicrozipcodeXXX_YYYY_aggregated.zip

Users should note that Geographic Microdata file structures and fields have changed for version 2.3.12. Documentation for previous versions can be found on the Geographic Microdata documentation web page.