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 ...
9
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2answers
563 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 ...
7
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3answers
892 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 ...
7
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1answer
83 views

How to decrease the distance between legend's items in R?

I'm trying to create correct choropleth() map in R using GISTools package. I use choro.legend() to display my legend. However I can't create either correct legend placement, AND/OR I don't understand ...
7
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1answer
704 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
685 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 ...
5
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0answers
94 views

rMaps choropleth with custom json

With R I want to make an animated choropleth map with the rMaps package and a custom map. I tried to follow the example of Diego Valle described here and to use the custom map info for Datamaps. ...
4
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1answer
860 views

Is it possible to draw a 3D Choropleth Map in ArcGIS?

What I have in mind is something like these two examples below: Also, if it is not possible to create a 3D choropleth map in ArcGIS, is there some other GIS software package that can draw 3D ...
4
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1answer
828 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 ...
4
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2answers
842 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 ...
4
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1answer
592 views

Displaying null data in choropleth using ArcGIS Desktop?

I am working in ArcMap and I have created a choropleth map (using a "population" attribute) that is rendering things basically correct except that when the "population" attribute is null, representing ...
4
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1answer
2k views

display a choropleth map using D3 and Leaflet

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 ...
3
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1answer
356 views

D3 missing zoom Choropleth + Raster

Following this example and Choropleth from Mike's site I am trying to get: image + vector + choropleth = my map As you can see I lost the zoom capability on the vector layer. I have been trying ...
3
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1answer
327 views

ArcGIS query - how can I find the average value (water consumption) from set of polygons?

I am fairly new to arcgis, so this is probably a really simple task, but I would like to ask advice so I can learn how to do it. :) Basically, I have a polygon layer that has attributes for each ...
3
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2answers
500 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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1answer
90 views

Leaflet Choropleth Map

I'm trying to create a choropleth map using leaflet. When running the code below the map just comes up with each county being the same color. How do I get each county to be colored based on the data ...
3
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1answer
542 views

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 ...
2
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2answers
417 views

CartoDB choropleth + bubble visualization with two independent value ranges in legend

I have been trying to display two values simultaneously i.e. one absolute value displayed by bubble size (as with layer wizard: bubble) and one relative value displayed by color (as with layer wizard: ...
2
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2answers
2k views

Zip Code-Level Choropleth Using Leaflet.JS

Brand new to Leaflet.js, but I'm enjoying learning it. However, I have a question I've been working on that even the Google hasn't been able to answer just yet. Is it possible to create a choropleth ...
2
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2answers
164 views

How do you make an unclassed choropleth in QGIS 2.x?

How do you make an unclassed choropleth in QGIS 2.x? I'm using 2.4 and can't find an option in a layer's Style tab like the continuous color option that seems to have existed in QGIS 1.x. I'm curious ...
2
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1answer
60 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
26 views

Automatic selection of colored regions when digitzing choropleth maps

I am new to working with GIS. I have a raster choropleth map similar to the one displayed below. I want to create a shapefile from the map, where each layer contains all the countries that have the ...
2
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1answer
520 views

Creating a World Population Density Map

I am trying to make a world population density Choropleth map (country level). The data I am using is publicly available on World Development Indicators website. Pretty much, I have an excel file ...
2
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1answer
289 views

How to make Choropleth map using Openlayers 3?

I want to make Choropleth map in Openlayers 3 which is already implemented in Leaflet but not in Openlayers 3. how to integrate 'colorbrewer' in Openlayers 3? Give the working example of it.
2
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1answer
44 views

Using timeslider in QGIS to show census data per year?

I have several shapefiles with the same geographic extend (in my case: Berlin and all its administrative subareas) and statistical (census) attribute data for every subarea displayed trough a ...
2
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1answer
36 views

Add Links to Leaflet Choropleth Map

I'm making a choropleth map based on this example I would like to add links to the map, so that when a user clicks on a state they will be taken to a specific page. For example, a user clicks on ...
2
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1answer
39 views

Automating Choropleth map creation from table in QGIS?

I am trying to create soil nutrient maps from an excel table. My table has the location with multiple nutrients for each location (Nitrogen, Potassium, pH etc). I would like to create a choropleth map ...
2
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0answers
95 views

Different Leaflet fillcolors for different layers

I have a leaflet map set up with two layers and I want them to use different colorization functions to color the choropleth shapes. My shapes are set up in layers like this: var povertyLayer = ...
2
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0answers
72 views

How do you create a map that has choropleths that will change with a timeslider? [closed]

I have data for different countries over time that I would like to display in a choropleth map with a time slider that plays automatically on click. What is the best way to do this. Thanks.
2
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0answers
170 views

R - how to create a pre-determined number of identical square polygons to use for a choropleth map?

I am trying to plot crime data density (again!) over a city map, say of NY. As a well known problem there are plenty of examples on this ...
2
votes
2answers
201 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 ...
1
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2answers
343 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, ...
1
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1answer
44 views

How to normalize choropleth maps of startups by state?

I want to display on a choropleth map the startups of a particular domain that operate in that state. I have a count of startups by state. How do I normalize so that the map is not represented ...
1
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1answer
287 views

Set CartoCSS ranges dynamically for choropleth

I know that I can generate a choropleth using CartoCSS like this: #volume [ number_of_cases <= 434] { marker-fill: #BD0026; } #volume [ number_of_cases <= 183] { marker-fill: #F03B20; } ...
1
vote
1answer
145 views

Associating location data from PostGIS for a Choropleth map?

I'm trying to build my first choropleth map from data that we have stored in our PostGIS enabled Postgres database. So far I've been able to build a map on Mapbox using a topojson set of UK postal ...
1
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2answers
2k views

Approach to creating a multivariate choropleth map with diverging color scheme(s)

We recently had primary elections in the community I serve. With the results having been released, there have been some requests for precinct level maps. Many of these primary elections featured more ...
1
vote
1answer
207 views

CartoDB, Choropleth and bucket numbers in skewed data sets

How can I maximise the number of buckets in the choropleth map? We have a data set range from 1-14 and 7 is the most # of buckets available in the wizard. Unfortunately, most of the data occurs ...
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0answers
18 views

geoserver sld color gone in zoom out

I badly need help... I have a layer served from geoserver, this layer is in polygon.. and in every polygon the color varies according to a number. so it is like a choropleth map. now my problem is ...
1
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1answer
61 views

Choropleth in Cartodb with lat and long of countries

I have a dataset in Cartodb with the following columns: Name,Count,Lat,Long When I upload the dataset, Cartodb automatically update the column Geometry with the Lat and Long. The Lat and Long in my ...
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0answers
46 views

QGIS choropleth map

In QGIS, when I change from single symbol to a graduated style, the map "disappears." When I change it back to single symbol, the map "reappears." The issue doesn't appear to be the scale, since it ...
1
vote
1answer
107 views

How to implement 4D Choropleth Map using cesiumjs?

I want to implement 4D Choropleth Map on cesiumjs. Anyone know how to do it and show me the code?
1
vote
1answer
70 views

Zooming into State

I am using R LeaftLet package to create a interactive choropleth of the US Map. Now my question I want both in one map itself but make zip code visible as I zoom in a state or double click on a ...
1
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0answers
375 views

Trying to Create a Global Choropleth Population Density Map then add Biodiversity Level

I am trying, quite unsuccessfully, to create a global choropleth population density map for a specific 120 countries, using ggplot2. Once I have created this choropleth map, I want to add number of ...
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0answers
115 views

Which bins should be used for demographic data for a choropleth map?

I'm currently working on a project which produces a choropleth map similar to a map like this: http://dl.dropboxusercontent.com/u/54512470/Telefondaten_VIZ/index.html That map has 2x5 classifications ...
1
vote
1answer
151 views

Overlap or intersect two choropleth [closed]

I have two choropleth of the same area but with different concentration data and I need to overlap them. My aim is to highlight the areas of intersection between the points with the highest ...
1
vote
1answer
295 views

Is there a way to have a choropleth map in Excel reading data from a sheet?

Is it possible to have a solution similar to ESRI maps for office in which I want basically a geojson file or any file for that matters to render a choropleth map based on data in a sheet? Tried ...
0
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1answer
54 views

How to create a choropleth map from a very Large geojson using Openlayers?

I am trying to create a choropleth map using OpenLayers 2 api from a Geojson file that has a size of about 229 mb. I have used the mapshaper tool to simplify the polyogns in this json to about 19 mb. ...
0
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2answers
403 views

OpenLayers 3 WMS Styling Using SLD_BODY and POST request

I'm using OpenLayers 3 and GeoServer to create a spatial web application in which I want to enable users to choose a colour ramp (using Colorbrewer) and a number of breaks for styling an attribute in ...
0
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1answer
634 views

Displaying properties from GeoJSON file in choropleth map Leaflet.js

I'm using the Leaflet.js library to generate a choropleth map of zip codes colored by some property values stored within an externally loaded GeoJSON file. I'm following a tutorial here but have run ...
0
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1answer
160 views

how to create a cloropleth world map in arcgis 10.2

I am new to arcgis and I am trying to create a cloropleth map to display ratio values for different countries. I believe that my basemap will need to have a country layer so that the shading of ...