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Questions tagged [cartography]

127 questions
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Setting extent to plot a certain country in Cartopy package, Python

I am getting started with package Cartopy for Python. I would like to display the map of Hungary with the help of package Cartopy. I'm using the following code. import cartopy.crs as ccrs import cartopy.feature as cfeature import matplotlib.pyplot…
Barnabás Visontai
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Head/tail breaks classification algorithm in R

I am trying to implement the head/tail breaks classification algorithm in R (see here). This relatively new algorithm is a less computationally expensive alternative to other classification methods used in Cartography for highly skewed data. So…
Mau
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interference on R map with geojson file

I downloaded the GeoJSON file from this link : https://public.opendatasoft.com/explore/dataset/contours-iris/export/ and I plot it, but I have an interference polygone interference_polygon_picture but on the web site, it shows the polygons and there…
Bok Ette
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D3 script failing to create points in the canvas after a certain limit

I am trying to draw check in information in a d3 canvas. I'm using this popular script to create the map and draw the points. I can draw roughly 12000 points, after that the script refuses to draw anything on the canvas. Could someone point out what…
Buggy Coder
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d3.scaleSequential is not a function

Following Mike Bostock's great tutorial on command-line cartography, when trying to produce a choropleth, I receive a TypeError saying that d3.scaleSequential is not a function. I imagine it is just not being exposed? But I don't know how to deal…
David Hagan
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R, "readOGR" function not found

I am on this site from some days for a work in R I am doing (on R-Studio), but I could not find the answer to my problem yet (it's the 3rd day I use R). The error is what follows: Error in readOGR(getwd(), "myfile") : could not find function…
Bruno
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Mike Bostock's ndjson-split discards data?

I've gone through Mike Bostock's excellent tutorials on Command-Line Cartography and I'm confused by his use of his ndjson-split utility. That program is used to split up an array of objects in a json file, putting each object in the array on a…
Timothy Barmann
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Issue with Plotting Counties Using spmap

I am trying to plot the counties in the continental U.S. by a value that the counties have associated with them. I am using the spmap package. My shape files comes from: https://www.census.gov/geo/maps-data/data/cbf/cbf_counties.html. I am using…
bill999
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odoo install failed on CentOS 6.7 (command "pip install pyopenssl")

Good afternoon, Im trying to install odoo CRM into a CentOS 6.7 minimal VM (RamNode). The guide I'm following is: https://odootricks.wordpress.com/2014/09/30/installing-odoo-8-on-centos-6-with-virtual-python-install/ So python 2.7 will be installed…
Fabio Valencia Suarez
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Attach markers to a bezier line and then "Pull" it straight with Inkscape

I have a bezier curve that I've used to trace the curve of a stream on a map. At points along the stream I have objects that mark the location of data. Is there anyway to attach the objects to the stream-curve and then straighten the curve? I'd…
equant
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Successful CartoDB Python API call doesn't update map?

Using urllib to make my API call to CartdoDB (per Andrew Hill's example here). I'm getting a successful '200' in response, and can get the script to print out my JSON response, but my problem is the map doesn't update after making this SELECT…
bdkauff
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Position road labels above lines with cartocss in Tilemill

I am styling a map in Tilemill and am attempting to place all my road labels above the road lines. By setting (text-dy: 10;) the label should be placed above the line. Unfortunately sometimes the label is placed 10px below the line instead. How…
easinewe
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Strange Fill Effect When Rendering Railroad Data in d3

I am getting strange results from using d3 to render a GeoJSON of railroad data. The file is very large, 38M, so I include one piece of it: https://gist.github.com/amiri/8202105. Here is my code: https://gist.github.com/amiri/8202126 Of course the…
Amiri Barksdale
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cartodb: cannot import csv with geojson column working with cartodb

I uploaded a shape file to cartodb then I exported it as a csv Now I want to load it from the csv file (I'm studying how to generate a csv like that from other sources) I have a geojson strng column with all the info of the geometry (a polygon) then…
opensas
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shp to topojson conversion : no output

Topojson's doc states: You can specify ESRI shapefiles as input: topojson -o output.json input.shp My .shp file is valid, npm and topojson are installed, and I'am in the input file's directory (cd). This topojson command simply doesn't work on my…
Hugolpz
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