Utah precinct shapefile and election data for 2016.

## RDH Date retrieval
08/12/2020

## Sources
The Utah precinct shapefiles come from the Utah AGRC and the voting tabulation districts from the US Census Bureau’s TIGER/Line program. Shapefiles for Utah’s congressional, house, and senate districts were also obtained from the Utah AGRC. Election data come from the MIT Election Data Science Lab.  Demographic data were downloaded at the census block level from IPUMS NHGIS.

## Fields
CountyID: County ID
VistaID: Precinct name and sub-precinct number
PrcncID: Precinct name
SbPrcnc: Sub-precinct number
AliasNm: Municipality name (where applicable)
DsslvID: Precinct unique identifier
cnty_nm: County name
cnty_fp: County FIPs code
jrsdctn: Jurisdiction name
PRES16D: Number of votes for 2016 Democratic presidential candidate 
PRES16R: Number of votes for 2016 Republican presidential candidate 
PRES16I: Number of votes for 2016 Independent presidential candidate (Evan McMullin)
SEN16D: Number of votes for 2016 Democratic senate candidate 
SEN16R: Number of votes for 2016 Republican senate candidate 
GOV16D: Number of votes for 2016 Democratic gubernatorial candidate 
GOV16R:  Number of votes for 2016 Republican gubernatorial candidate
TOTPOP: Total population 
NH_WHITE: White, non-hispanic, population
NH_BLACK: Black, non-hispanic, population
NH_AMIN: American Indian and Alaska Native, non-hispanic, population
NH_ASIAN: Asian, non-hispanic, population
NH_NHPI: Native Hawaiian and Pacific Islander, non-hispanic, population
NH_OTHER: Other race, non-hispanic, population
NH_2MORE: Two or more races, non-hispanic, population
HISP: Hispanic population
H_WHITE: White, hispanic, population
H_BLACK: Black, hispanic, population
H_AMIN: American Indian and Alaska Native, hispanic, population
H_ASIAN: Asian, hispanic, population
H_NHPI: Native Hawaiian and Pacific Islander, hispanic, population
H_OTHER: Other race, hispanic, population
H_2MORE: Two or more races, hispanic, population
VAP: Total voting age population
HVAP: Hispanic voting age population
WVAP: White, non-hispanic, voting age population
BVAP: Black, non-hispanic, voting age population
AMINVAP: American Indian and Alaska Native, non-hispanic, voting age population
ASIANVAP: Asian, non-hispanic, voting age population
NHPIVAP: Native Hawaiian and Pacific Islander, non-hispanic, voting age population
OTHERVAP: Other race, non-hispanic, voting age population
2MOREVAP: Two or more races, non-hispanic, voting age population
CD: US congressional district ID
SENDIST: State Senate district ID
HDIST: State House district ID

Projection
This shapefile uses a NAD83/UTM zone 12 North projection (EPSG:26912).

## Processing Steps
The topology of the precinct shapefile was repaired using the st_make_valid() function from the R package lwgeom. Sub-precincts in the shapefile were merged to match the precinct IDs in the election results. Demographic data were aggregated from the block level using MGGG’s proration software. Congressional, house, and senate district IDs were assigned to precincts also using this package.

## Additional Notes
Rating from MGGG: We give this shapefile an B rating. Precinct level election data did not neatly correspond to the precinct shapefile and some merging of precincts had to be performed in order to join the two files.