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Cartographer Thematic Mapping Library for Google
posted by Satri
on Friday November 06, @01:35PM
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from the thematic-Internet-gods dept.
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from the thematic-Internet-gods dept.
nan writes " A library for Google Maps to provide a simple, elegant interface to standard thematic cartography
It supports:
It supports:
- Choropleth maps—sometimes known as heatmaps—color regions or polygons based on values.
- Pie charts at specified latititude/longitude points.
- Area scaled circles that represent clusters of points. Zooming in or out will re-cluster the points. Useful for large quantities of points. Individual points can contain unique values that will be summed to equal the value for a particular item in the cluster. Info balloons will be created as an ordered list of all the labels in the data set for a particular cluster.
Related Stories
Application Domains: A Summary of Thematic Mapping Techniques
[+]
The thematic mapping blog offers a short but informative summary of thematic mapping techniques.
The introduction: "Jaques Bertin (1967) established a graphic system of visual variables, which represents an universally recognized theory of the cartographic transcription of geographical information (Koch, 2001). Visual variables describe the perceived differences in map symbols that are used to represent geographical phenomena (Slocum et al., 2005). Bertin’s system has been subsequently modified by various cartographers (Koch, 2001), and the visual variables presented below are based on Slocum et al. (2007), which add 3-D symbolisation.
Cartographers commonly distinguish between point, line, area and volume symbolisation (Robinson et al., 1995; Slocum et al., 2005)."
See also previous stories below.
The Thematic Mapping Engine Now Open Source
[+]
The Thematic Mapping Engine is now available as open source. From the entry: "Many people have asked, - and today, I've released the source code of the Thematic Mapping Engine (TME) under a GPLv3 license. The engine takes statistical data, spatial features and thematic mapping parameters as input and returns a KMZ file. This file can be viewed in Google Earth, or other geobrowsers supporting the KML standard. TME can be accessed from a web interface or a PHP script."
See also related stories below.
Application Domains: Introducing Thematic Mapping API
[+]
We mentioned the open source Thematic Engine in the past, now Bjorn introduces the Thematic Mapping API.
From the entry: "The brand new Thematic Mapping API enables you to create KML based thematic maps from your own data source. This JavaScript library is the missing link between Google Visualization API and Google Earth API (or other geobrowser APIs supporting the KML standard)."
Last week, the FGT blog ran an entry named Thematic Data In Google Maps With "Plug And Play Maps" and another named Excel Spreadsheet Data To Google Earth Thematic Map.
See also related stories below.
Launching MapsGeek - A Thematic Mapping Website
[+]
Alex writes "MapsGeek is a free web based application for creating thematic maps or
choropleths map. You can use the vector layers already present on the
website or upload your own, we handle most of the formats through OGR.
You can also add WMS layer. For data, you can import Excel files or
enter the data manually. The maps produced can then be used
everywhere. If the created map is set as public, everybody can modify
it so if you're displaying it on your blog for example, the map will
be automatically updated. MapsGeek also has a WMS server
(http://www.mapsgeek.com/wms/).
MapsGeek is far from being finished but it's already working very
well. The goal is to provide non GIS users a way to easily map data
without any installation."
See also the very related stories below.
Application Domains: Milestones in the History of Thematic Cartography
[+]
O'Reilly shares a link to a timeline of the Milestones in the History of Thematic Cartography.
The O'Reilly summary: "This resource provides a comprehensive view of the history of cartography, with examples of maps created throughout the ages and background information about the contexts within which those maps, visualizations and map making technologies were created. Explore each time period, click on the images and stories found throughout each time line, and read more about the history of creating thematic maps as a means of visualizing data."
See also previous related stories below.
Reviews: "Using KML for Thematic Mapping" Research Paper
[+]
A little over a week ago, Bjørn Sandvik of the Thematic Mapping blog and its open source engine shared his research paper named "Using KML for Thematic Mapping".
From the blig entry: "My research paper, Using KML for Thematic Mapping, is now available for download (PDF, 2.3 MB). This is the first part of my MSc GIS thesis from University of Edinburgh. The second part of my thesis, describing the Thematic Mapping Engine, is already available on this page. The thesis was awarded with distinction and an invitation to Googleplex."
See also previous thematic mapping stories below.
Cartographer Thematic Mapping Library for Google
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