791 search results for "maps"

Maps with R, and polygon boundaries

December 21, 2011
By
Maps with R, and polygon boundaries

With R, it is extremely easy to draw maps. Let us start with something simple, like French regions. Baptiste mentioned on his blog that shapefiles can be downloaded from http://ign.fr/ website. Hence, if you extract the zip file, it is possible to ...

Read more »

Create maps with maptools R package

December 13, 2011
By
Create maps with maptools R package

Baptiste Coulmont explains on his blog how to use the R package maptools. It is based on shapefile files, for example the ones offered by the French geography agency IGN (at départements and communes level). Some additional material like roads and railways are provided by the OpenStreetMap project, here. For the above map, you need

Read more »

..A Quick Geo-Trick for GoogleMaps in R (using dismo)

November 26, 2011
By
..A Quick Geo-Trick for GoogleMaps in R (using dismo)

... I thought this geocoding-bit might be worth to share (found HERE when searching the web for dismo-documentation).Read more »

Read more »

Drawing polar centered spatial maps using ggplot2

November 8, 2011
By
Drawing polar centered spatial maps using ggplot2

Drawing maps of the polar regions can be done using square spatial maps. A small example says more than a thousand words: xlim = c(-180,180) ylim = c(60,90)   # Some fake grid data dat_grid = expand.grid(x = xlim[1]:xlim[2], y… See more ›

Read more »

Please use sensible colours in your maps

November 2, 2011
By

If you are creating maps then for goodness sake Use sensible colours!  I was helping some undergraduates with some work the other day, and they decided to use the following colour scheme for representing river depth: Deep water: Red Medium-depth water: Bright green Shallow water: Pink Why did they do this? Well, either they were

Read more »

Isarithmic Maps of Public Opinion Data

October 24, 2011
By
Isarithmic Maps of Public Opinion Data

As a follow-up to my isarithmic maps of county electoral data, I have attempted to experiment with extending the technique in two ways. First, where the electoral maps are based on data aggregated to the county level, I have sought to generalize the method to accept individual responses for which only zip code data is … Continue reading →

Read more »

Open Street maps

October 8, 2011
By
Open Street maps

There have been some exciting developments in the Deducer ecosystem over the summer which should go into CRAN release in the next few months. Today I'm going to give a quick sneak peek at an Open Street Map - R connection with accompanying GUI. This post will just show the non-GUI components. The first part of the

Read more »

Calling Google Maps API from R

October 5, 2011
By
Calling Google Maps API from R

Hi, Related to Julyan’s previous post, I want to share an easy way to access Google Maps API through R. And then we’ll stop about Google, otherwise it’ll look like we’re just looking for jobs. My problem was the following: … Continue reading →

Read more »

Drawing maps using shapefiles and R

October 4, 2011
By
Drawing maps using shapefiles and R

Sometimes a student may use a self explained chart, instead of a boring table for showing outcomes in a research paper. Yet, graphs are efficient in showing the broad picture of an issue and also for present results. In political science, you can getting into this topic reading Kastellec and Leoni (2007), for instance. I

Read more »

Nice Species Distribution Maps with GBIF-Data in R

September 23, 2011
By
Nice Species Distribution Maps with GBIF-Data in R

Here's an example of how to easily produce real nice distribution maps from GBIF-data in R with package maps... Read more »

Read more »