792 search results for "maps"

map.xyz(): interpolation of XYZ data and projection onto a map

May 30, 2011
By
map.xyz(): interpolation of XYZ data and projection onto a map

     I am still struggling to get a grasp of R's mapping capabilities. Part of my frustration lies in the fact that I often work on areas near the poles, which complicates interpolation across the 180 degree line. For smaller areas, interpolati...

Read more »

sab-R-metrics: Kernel Density Smoothing

May 25, 2011
By
sab-R-metrics: Kernel Density Smoothing

Last time I left you, I had gone over some basics of doing loess regression in R. If you remember, loess is a sort of regression that allows wigglyness in your regression of some dependent variable Y on some independent variable X (I will generalize t...

Read more »

sab-R-metrics: Kernel Density Smoothing

May 25, 2011
By
sab-R-metrics: Kernel Density Smoothing

Last time I left you, I had gone over some basics of doing loess regression in R. If you remember, loess is a sort of regression that allows wigglyness in your regression of some dependent variable Y on some independent variable X (I will generalize t...

Read more »

Terrain Classification Experiment 2: GRASS, R, and the raster package

May 24, 2011
By
Terrain Classification Experiment 2: GRASS, R, and the raster package

Quick post on terrain classification, based on some trouble folks were having with a previous example on Windows. With the spgrass6 package, raster stacks are created by loading several GRASS files at once: x <- readRAST6(vname=c('beam_sum_m...

Read more »

Great circles, raster, sp and lattice

Great circles, raster, sp and lattice

Recently I found a post at FlowingData with a detailed tutorial to map connections with great circles with R. The tutorial of FlowingData is excellent, but I feel more comfortable with the sp classes and methods, and with the lattice and latticeExtra packages. Besides, I want to use the free spatial data available from the

Read more »

Mapping locations in R with the Data Science Toolkit

May 18, 2011
By
Mapping locations in R with the Data Science Toolkit

Pete Warden's Data Science Toolkit (which we mentioned briefly last week) is an open-source information server that provides an API you can query for information useful for building data science applications, like identifying proper names in unstructured text, or converting IP addresses to lat/long coordinates. You can make queries via the Web interface or by direct interface to the...

Read more »

In case you missed it: April Roundup

May 17, 2011
By

In case you missed them, here are some articles from April of particular interest to R users. The Heritage Health Prize, a competition to build predictive models for hospitalization with USD$3.2M in prizes, is open. The Inside-R.org community site now provides the ability to search and view the help files for CRAN packages. Revolution R Enterprise 4.3 released: R...

Read more »

Mapping points

May 16, 2011
By
Mapping points

Since I look at mercury concentrations at different measurement stations in North America, visualization using a map with values (of your favourite parameter) plotted as colour-coded circles is quite useful. After some trial & error, here is some very basic code … Continue reading →

Read more »

Review of 2011 Data Scientist Summit

May 13, 2011
By
Review of 2011 Data Scientist Summit

Some time over the past 6 weeks I randomly saw a tweet announcing the “Data Scientist Summit” and shortly below it I saw that it would be held in Las Vegas at the Venetian. Being a Data Scientist myself is reason enough to not pass up this opportunity, but Vegas definitely sweetens the deal! On Wednesday I woke up...

Read more »