New Maptitude 3d Surfaces Section

I have just added a new section to the Maptitude ‘Howto’ pages over at mapping-tools.com, discussing Maptitude’s 3d surface and landscape options. Here is an example image of Snowdonia, created using Ordnance Survey elevation data combined with Google Maps Satellite imagery: Other examples include Guadalupe Mountains (Texas), and geological overlays of both the Caprock Escarpment ...

Mapping the St Albans Sinkhole 2

Mapping the St Albans Sinkhole
On 1st October, a large sinkhole opened up in St Albans, UK, cutting off an entire cul-de-sac of houses. New sinkholes are very common, but this one quickly became international news due to its photogenic proximity to houses. We think of sinkholes as appearing in places like Florida or the Yorkshire Dales. Why did one ...

Voting Machines in the Florida 2000 Election

This example uses Caliper® Maptitude® to analyze the Florida results of the 2000 US Presidential Election. During the 2000 Presidential Election, the results for Florida came under close scrutiny and argument, with the final result being decided by the courts. Amongst the accusations was the charge that a lot of people in the county of ...

Technical Overview: GeoNames

GeoNames is a series of web services to an extensive geographical database of over 8,000,000 names. The database is also available for “bulk” download. Both access methods are under the Creative Commons attribution license. The web services are available through free and commercial interfaces, and using a number of different format/protocols.

Polar Maps and Projections: Part 2, Implementation 2

The first part of this article looked at different ways of producing polar maps and surveyed a number of different azimuthal projections that are often used for polar maps. In this second part, I produce a working implementation using UMN MapServer and OpenLayers.

Polar Maps and Projections: Part 1, Overview

With the success of my earlier series on global equal area map projections (starting with this overview), I received a number of requests to produce a similar how-to article for polar maps. The first part of this article (published here) provides an overview of a number of different map projections commonly used for polar maps. ...

How to create an online map with a non-Mercator Projection: Part 2

In the first part of this article we created a WMS server of basemaps using an unconventional map projection (the Mollweide projection). In this second part, we shall implement the client side of the project, creating a working application that will plot user data on the basemaps.

How to create an online map with a non-Mercator Projection: Part 1

Previous articles in this series, discussed different coordinate systems and map projections available, and why different systems suit different applications (Part 1, 2). This was followed by a look at geostatistical and thematic maps where data areas and data densities are important (Part 1, 2, 3). Virtually all online map applications use the Mercator projection. ...

Choosing a Projection, Part 3: Pseudo-Cylindrical Projections

After looking at the need for global equal area projections and a number of different possible projections, we shall now look at the pseudo-cylindrical options. There are a lot more of these, so we cover them in an article of their own. Pseudo-cylindrical projections are similar to cylindrical projections, but the central meridian is the ...

Choosing a Projection, Part 2: Pseudo-Conic, Azimuthal, and Cylindrical Projections

In the first part of this article, I argued against the use of Mercator and Equirectangular projections for web maps showing global data distributions and areas. Instead, an equal area projection is more appropriate because it preserves relative areas and data densities. In the final two parts, I shall look at some possible equal area ...