Maryland Adjusted 2020 PL Block-Level Data (Cleaned + Standardized)

## RDH Date Retrieval
02/21/23

## Sources
Maryland Citizens Redistricting Commission via [Redistricting Data Hub website](https://redistrictingdatahub.org/dataset/maryland-block-pl-94-171-2020-official/).

## Fields:
Field Name Description                                   
GEOID20    Census Block GEOID                            
PL_TotPop  Total Population in the Unadjusted Census Data
Adj_Change Change in Population from Adjustment          
Adj_TotPop Total Population in the Adjusted Census Data  

This file also contains all the adjusted demographic fields in the file made available by the state. 
These fields include: ['P0020002', 'P0020005', 'P0020006', 'P0020007', 'P0020008', 'P0020009', 'P0020010', 'P0020011', 'P0030001', 'P0040002', 'P0040005', 'P0040006', 'P0040007', 'P0040008', 'P0040009', 'P0040010', 'P0040012']
In the file fields starting with 'A_' contain adjusted values and those without contain unadjusted values.
Please see the [Fields and Descriptions page](https://redistrictingdatahub.org/data/about-our-data/pl-94171-dataset/fields-and-descriptions/) for detailed definitions.

## Processing Steps
Official files were downloaded from official sources via the RDH website.
Where necessary, files were combined into one statewide file and column names were changed to match PL fields.
The PL field assignment was checked by comparing adjusted PL data in blocks where populations did not appear to change.
They matched in all instances.
Please note that some states removed population as part of their adjustment, so the sum of an adjusted column may differ from that of its unadjusted equivalent.

Please note that Maryland's official documentation appears to mislabel one of their fields. The name of one of its columns implies the field is "P0040011", but in comparing the values, it appears to actually be "P0040012".

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