117th Congressional Districts (Nov. 2020 Election, Active Jan. 2020 - Jan. 2021)

## RDH Date Retrieval
03/28/23

## Sources
U.S. Census via RDH
All About Redistricting via RDH

## Fields:
Field Name Description                  
***national_cong117_2020_baf.csv***
GEOID20    Census Block GEOID
CONG117    Unique District Identifier
STATE      State Abbreviation
DISTRICT   District Number or 'AT-LARGE' or 'NO VALUE'

***national_cong117_boundary***
CONG117    Unique District Identifier
STATE      State Abbreviation
DISTRICT   District Number or 'AT-LARGE'

***national_cong117_carto_boundary***                  
CONG117    Unique District Identifier
STATE      State Abbreviation
DISTRICT   District Number or 'AT-LARGE'

## Processing Steps
For the BAF, download Census PL 94-171 processed data from the RDH. 
Filter files to just GEOCODE (renamed to GEOID20) and CD116 to create BAF. 
Since North Carolina had congressional redistricting between the 116th and 117th Congress, new block assignments need to be made.
To do this, we used the maup library to spatially assign 2020 blocks to the new districts.
Clean names for BAF (remove leading zeros, swap '00' districts to 'AT-LARGE', 'ZZ' to 'NO VALUE').

Download Census CD116 shapefile from the U.S. Census (tl_2018_us_cd116.zip).
Filter down to the 50 states.
Clean names for BAF (remove leading zeros, swap '00' districts to 'AT-LARGE').
The shapes for North Carolina were replaced with the districts passed in 2018.
Filter out 'ZZ' areas so that the total number of districts is 435.

Cartographic file is downloaded from the U.S. Census (cb_2018_us_cd116_500k.zip).
Filter down to the 50 states.
The shapes for North Carolina were replaced with the districts passed in 2018 and clipped to the boundary of the original North Carolina boundaries.
Clean names for BAF (remove leading zeros, swap '00' districts to 'AT-LARGE').

## Additional Information
Please direct questions related to processing this dataset to info@redistrictingdatahub.org.