3109 search results for "map"

GIS in R: Part 1

March 27, 2014
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GIS in R: Part 1

I messed around with R for years without really learning how to use it properly. I think it’s because I could always throw my hands up when the going got tough and run back and cling the skirts of Excel or JMP or Systat. I finally learned how to use R when I needed to

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Accessing iNaturalist data

March 26, 2014
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Accessing iNaturalist data

The iNaturalist project is a really cool way to both engage people in citizen science and collect species occurrence data. The premise is pretty simple, users download an app for their smartphone, and then can easily geo reference any specimen they see, uploading it to the iNaturalist website. It let's users turn casual observations into meaningful...

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Sankey diagrams with googleVis

March 25, 2014
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Sankey diagrams with googleVis

Sankey diagrams are great for visualising flows from one set of data values to another. Although named after Irish Captain Matthew Henry Phineas Riall Sankey, who used this type of diagram in 1898 to show the energy efficiency of a steam engine, the best know Sankey diagram is probably Charles Minard's Map of Napoleon's Russian Campaign...

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Which states are the most concerned by gun crime?

March 24, 2014
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Which states are the most concerned by gun crime?

I recently discovered the Capitol Words API and have had some fun playing around with it. One of the categories in the API allows you to search for the words spoken by the senators of each state in the USA, and I was interested in finding out the number of times the words “gun” were recorded on a

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Accessing global weather model data using the rNOMADS package in R

March 23, 2014
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Accessing global weather model data using the rNOMADS package in R

The rNOMADS package interfaces with the NOAA Operational Model Archive and Distribution System to provide access to 55 operational (i.e. real time and prediction) models describing the state of the ocean and the atmosphere. rNOMADS has been used to get wind and wave data for a real time sailing game, to quantify solar energy available

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Recreational Data

March 21, 2014
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Recreational Data

Part of my weekend ritual is to buy the weekend papers and have a go at the recreational maths problems that are Sudoku and Killer. I also look for news stories with a data angle that might prompt a bit of recreational data activity… In a paper that may or may not have been presented

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Aggregating spatial points by clusters

March 21, 2014
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Aggregating spatial points by clusters

With ubiquitous collection devices (e.g. smartphones), having too much data may become an increasingly common problem for spatial analysts, even with increasingly powerful computers. This is ironic, because a few short decades ago, too little data was a primary constraint. This tutorial builds on the 'Attribute joins' section of the Creating maps in R tutorial to demonstrate how clusters can be...

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Frequentist German Tank Problem

March 20, 2014
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Frequentist German Tank Problem

The German Tank Problem: The Frequentist Way Many things are given a serial number and often that serial number, logically, starts at 1 and for each new unit is increased by 1. For example, German tanks in World War II had several parts with serial numbers. By collecting...

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Pre-processing for approximate Bayesian computation in image analysis

March 20, 2014
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Pre-processing for approximate Bayesian computation in image analysis

With Matt Moores and Kerrie Mengersen, from QUT, we wrote this short paper just in time for the MCMSki IV Special Issue of Statistics & Computing. And arXived it, as well. The global idea is to cut down on the cost of running an ABC experiment by removing the simulation of a humongous state-space vector,

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Why multiple imputation?

March 20, 2014
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Why multiple imputation?

Background In the forth coming week, I will be giving a presentation on the fundamentals of imputation to my colleagues. One of the most important idea I would like to present is multiple imputation. In my last post, I have...

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