Questions tagged [redistricting]
Redistricting is the process of drawing electoral district boundaries in the USA.
I want to use create legislative district polygons based on watersheds using QGIS, preferably
Generically, the problem is to take small polygons (HUC 12 watersheds intersected with counties and/or minor civil divisions) and disolve those into larger polygons that meet a couple of criteria: ...
Splitting Polygon by Population?
I'm new to GIS. I'm working on a project right now that is about assisted living facilities in my state. I have a map of my state that I've divided into six regions by creating Thiessen polygons. The ...
How to compare two different polygon shapefiles to compare how shapes have changed between the two?
I am trying to use R to compare the changes in shape of two multipolygon shapefiles. Specifically, these data are congressional districts from 2010 and 2013 in Wisconsin, so they have the same number ...
Creating additional attributes for regional intersections?
A certain country is (simultaneously and independently) divided into 400 regions and 100 judicial districts. Each division is represented by a separate multipolygon layers with units as features. ...
Dividing polygons into equal sub-regions based on population using QGIS? [duplicate]
I'm using demographic data in California by census tract, and I'd like to be able to group those census tracts into 4 regions with an equal population in each region. Any recommendations for how to do ...
Dividing space into homogeneous connected areas [duplicate]
Is there an algorithm (or software) for splitting a map into K connected areas such that the within-area variance of some variable is minimised, and the between-area variance of that variable is ...
Modifying polygon attribute interactively on web map for public interaction
Calculating change between two sets of district lines?
I'm using the Census Shape files for state legislative district lines for 2008 and 2012. I want to create a measure that indicates how much these lines have changed between these two time periods (...
Dissolving closest area or area with biggest shared boarder [closed]
I am almost finished with a very large districting project but I'm having problems with this last step. I am using ArcMap I have made districts that needs to be larger than 150 residents. My last ...
Redistricting for QGIS plugin,voters field error
I'm using the Redistricting for QGIS plugin .My QGIS version is 2.14.10-Essen.I'm getting this error message:The pengundi (voters field) must be an integer number field. My shapefile is the shp file ...
Determining which polygons only intersect once with the polygons of another shapefile
I have two shapefiles, one for counties and one for congressional districts. I need to determine which counties are in more than one congressional district. I would think I could use postgis and use ...
Creating "districts" from points [closed]
Hypothetical situation: I've got a database with 100,000 customer addresses, which are spread out across the continental US. I've also got a year end totals for number of purchases and value of ...
Simple Spatial Join of Point Feature to Polygon Target Feature Not So Simple (Source Files Included)
I have what should be a simple task to perform: join ~47K census blocks from the PL redistricting files with pop and racial data joined to Chicago Public Schools High School boundaries to get an ...
Which census geography boundaries do congressional districts preserve?
Tried searching for this information elsewhere and couldn't find a clear answer in the TIGER documentation, so I thought I'd turn to you good folks. Obviously, congressional districts can cut across ...
Steps for redistricting using ArcGIS Desktop or Open Source GIS? [closed]
I have been struggling with how to redistrict in ArcGIS Desktop so can anyone put me through the necessary steps, data, extensions, to perform this operation. More so, is there any Open Source GIS ...
Where can I find the finest granularity of 2010 US census population information?
I am writing a re-districting application where I want to be able to create US voting districts based on geographic coordinate population data. In a perfect world, I would have the population for each ...
Aggregating Polygons To Meet Privacy Requirements
I have a point feature class representing office locations of all employers in a certain industry. The feature class has an attribute for storing the number of employees working at each office. ...
What spatial analysis did the US Supreme Court review in the Perry v. Perez opinion?
The Supreme Court recently issued an opinion on Perry v. Perez which seems like it must have involved evidence based on spatial analysis. The L.A. Times reports: The 9-0 decision set aside a new ...
Seeking tools for regionalization/redistricting?
I am looking for tools for regionalization / districting in GIS. So far I have been able to identify Districting ArcGIS extension (now also online) REDCAP (currently limited to 50k input polygons) ...