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Questions tagged [cartography]

127 questions
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How to approach and design a qualitative data color scheme for over 20+ layers on a map?

I am working on an interactive map (Leaflet with GeoJSON layers) showing the various ethnic groups of a certain country. How would I go about developing a color scheme for over 26 different ethnic groups? I am working with qualitative data and want…
redshift
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How to calculate a distance between two cities using cartography?

I have latitude and longitude of two cities. Is there any free option to calculate the travel distance between these cities using cartography? At the moment, I implemented the Haversine formula for computing the great-circle distance. Then I…
Klausos Klausos
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cartodb: invalid value when using [value] in torque css

I am trying out CartoDB visualization with Torque. In my css file I have: Map…
Khue Vu
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How to draw graphics on Google Map from Web Mercator Meters/Feet

I used to draw graphics on Google Map from decimal degrees (latlng), but recently I found a server that only provide Web Mercator meters (or feet perhaps). Then I found the function to draw decimal degrees does not apply to Web Mercator meters: …
HQXU85
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Using Mapnik comp-op to mask out raster layer using a vector layer

I'm trying to make a map with Mapnik using separate datasets for the land and sea. Land is a raster dataset from Landsat imagery. Ocean is a raster dataset created with gdaldem from NOAA bathymetry. The Landsat dataset includes ocean imagery, but…
John
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How to use a mapbox map in cartodb

I tried to integrate this map: https://a.tiles.mapbox.com/v4/felixmichel.kh7h21lp/page.html?access_token=pk.eyJ1IjoiZmVsaXhtaWNoZWwiLCJhIjoiZWZrazRjOCJ9.62fkOEqGMxFxJZPJuo2iIQ#11/47.6732/7.5352 into cartodb. But, it doesn't work. I work with…
Felix
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Set map pan limits in Cartodb

How do I set no-world-wrap or pan limits to a CartoDB map? I have a world map displaying data and client is not keen on panning around the globe.
UncleJune
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Polygons formatted in GeoJSON don't appear correctly

I'm trying to make a map using d3.js and three data files: a simple .topojson file with my base map a .geojson file with polygonal areas a .csv file with data (which has a field in common with the .geojson) First, I created my base map with this…
Raphadasilva
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Replacing one d3 visualisation with another d3 visualisation in same place?

I'm using the datamaps library for d3 and I have asked the question unsuccessfully there on github so I wanted to cross-post it here. What I'm trying to do is to visualise two measures – Income Inequality (Gini) and GDP per capita – in one world map…
user2656065
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Online and offline tiles in Leaflet

I have various problems in attempting to show tiles from two different sources in Leaflet : 1: The first view doesn't match the center I have defined, but if I move the window, the center of the map changes and it is centered correctly. I don't…
zelocalhost
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How to serve styled vector map data via CartoCSS

I've got an example data set of lines and points, representing peoples' journey to work and where they feel at risk from road accidents. Now, the data have attributes such as Place (Home, Work, Danger) and the severity of accidents they fear in…
RobinLovelace
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widgets for a sketching/drawing application

I'm trying to build a small application for a specific problem in cartography. The workflow is like this: in the field, use a compass and tape measure to obtain terrain data. also in the field, sketch the plot being surveyed using inkscape, create…
Renato
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Plot points map of population

I want to plot kind of isarhytmoc points map like in this tutorial, but with population data. However, unfortunately, I have no enough skill and only came with such…
Ruvin Rafailov
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Need map visualization tool which treats countries like bars in a bar chart

I've been searching the internet for a package which can create a simply global map. There are several which I've searched, webgl globe, kartograph, cartodb, R etc. None of these have what I'm looking for. What I'm looking for: I want a map of the…
user2331566
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how to scale map coordinates to ensure it is completely visible

I'm working on a GIS-like app, and I need to draw a (2d)cartographic map on a Gtk window. We get the coordinates - already converted into standard x, y format - from PROJ.4. All points have very large numbers as coordinates. For example, a…
IT.
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