Posts Tagged ‘density’

New City Landscapes – Interactive Tweetography Maps (UrbanTick)

Wednesday, June 30th, 2010

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[Editor’s note: Series of maps showing twitter tweet density in New York, London, Paris and Munich (some but not all tweets are tagged with geographic coordinates) with hypsometric tints, contours, and placenames (with some literary license). A little more refined than those San Francisco crime maps floating around earlier this month. Thanks Andy!]

Republished from @UrbanTick

Over the past few months we have been harvesting geospatial data from Twitter with the aim of creating a series of new city maps based on Twitter data. Via a radius of 30km around New York, London, Paris, Munich we have collated the number of Tweets and created our New City Landscape Maps.

Continue reading at UrbanTick . . .

Density Mapping in Google Maps with HeatMapAPI (GeoChalkboard)

Monday, April 27th, 2009

[Editor's note: Heat maps are a useful way to qualitatively represent densely clustered point locations on a map. This post from GeoChalkboard walks thru how to create using the Google Maps API and the HeatMap API.]

Republished from GeoChalkboard, there on March 11, 2009.

In the GIS world heat maps are a graphical representation of point data on a map through the use of colors that indicate the density of some variable such as crime incidents or traffic accidents.  Heat maps let users quickly visualize the density of locations. Being able to understand the density of point locations makes it much easier to see patterns in your data, especially when using colors. In this post we’re going to examine the HeatMapAPI, a JavaScript API for creating heat maps in Google Maps.


(Above) 2009 Starbucks Store Closures

Introduction
HeatMapAPI can be used over the Internet or as a .NET DLL that runs in a local environment and allows you to integrate heat map images into Google Maps or other GIS systems.  In this post we’re going to use HeatMapAPI to visualize the density of recent Starbucks store closures.  In a recent statement, Starbucks announced the closure of 600+ stores in the United States due to economic conditions.

Continue reading at GeoChalkboard . . .