A choropleth map is a thematic map in which areas are shaded or patterned in proportion to the measurement of the statistical variable being displayed on the map, such as population density or per-capita income.

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Choropleth in R: custom breaks and plotting

I have a question with regard to plotting a choropleth map. What is recommended with regard to plotting a map with custom breaks? And make it look a bit attractive. In my script I have used the ...
6
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1answer
168 views

Help choosing most suitable bivariate choropleth mapping coloring scheme

I am trying to overlay a nominal variable (2 categories - rainfed vs irrigated) in a choropleth map over a numeric variable. In order to highlight the difference in pattern among the two ...
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3answers
223 views

Should I use a discrete or continuous scale for coloring a chloropleth?

I am making a choropleth for an upcoming local race using D3. There are two candidates running for an election. For any given polygon on my map, if the red candidate has more votes, the color should ...
5
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1answer
298 views

Simplest Way to Create a Custom Choropleth Map for a Website?

I am working on a choropleth map for a real estate site. My current workflow is: Edit and save SHP file's DBF in Libre Office Calc. Load SHP file into Quantum GIS. Set colored breakpoints based on ...
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3answers
174 views

Comparing choropleth maps statistically

I have several sets of choropleth maps showing ranges of poverty by census tract, each using a different poverty measure. All of the maps use the same categorical ranges to define poverty status. The ...
3
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2answers
89 views

Breaking a range of values into buckets for a gradient

If I have a range of values and want to make a choropleth map with a gradient, what algorithms are out there to determine the value ranges for the different colors in the gradient? For example, if I ...
3
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2answers
125 views

How can I create a choropleth from the 2010 census ZCTA shapefile using R and ggplot2?

I have created state and county choropleths in R using ggplot2. The method I have used for this came from Winston Chang's "R Graphics Cookbook". For those choropleths the map was already represented ...
2
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1answer
41 views

Is there demand for a service to publish web maps with lots of shapes? [closed]

Is anyone in the GIS community trying to publish choropleth web maps with a large (10s to 100s of thousands) number of polygons? and if so what's your current approach and what are the shortcomings of ...
2
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1answer
753 views

display a choropleth map using D3 and Leaftlet

I am trying to get a leaflet map to display a choropleth map using d3. I have written this code using samples I have found however the map just displays as the black fill, not the color classes I ...
2
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1answer
78 views

Choropleth Mapping Using Quantile Method in CartoDB

Does anyone know how CartoDB calculates the buckets for a choropleth map using the quantile method? My understanding of choropleth maps that use the quantile method is that they will assign an equal ...
2
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2answers
128 views

Choosing intervals for a map of race in the United States

I'm creating an open map layer of race in the United States using Census Data. This layer will be publicly available in the near future as "Justice Map". The goal is to help others create maps using ...
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2answers
107 views

County-Level Ethnic Shapefile: United States

My professor usually provides the shapefiles that we deal with in our analyses of the United States--population, votes, etc., but I'd like to know how I can get these myself. I'd like, in particular, ...
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0answers
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leaflet choropleth map using dynamic value

I am doing a choropleth map using leaflet and JSON data. I got a clean tutorial in leaflet site. In that tutorial the used us-states.js JSON file where the choropleth was based on the ...
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0answers
16 views

overlay bubble plot and choropleth in R with maptools [duplicate]

I am working with US education data, and have been asked to create maps that overlay a measure of student poverty and academic achievement. Ideally, I would be able to do this by creating a choropleth ...