Smallest-circle problem The smallest-circle problem in the plane is an example of a facility location problem (the 1-center problem) in which the location of a new facility must be chosen to provide service to a number of customers, minimizing the farthest distance that any customer must travel to reach the new facility. Both the smallest circle problem in the plane, and the smallest bounding sphere problem in any higher-dimensional space of bounded dimension, may be solved in linear time. Characterization Most of the geometric approaches for the problem look for points that lie on the boundary of the minimum circle and are based on the following simple facts: The minimum covering circle is unique.The minimum covering circle of a set S can be determined by at most three points in S which lie on the boundary of the circle. If it is determined by only two points, then the line segment joining those two points must be a diameter of the minimum circle. Linear-time solutions
Space-Time Research With self-service options offering enormous benefits in terms of speed, availability and cost, SuperWEB2 gives beautifully visualised ad-hoc tabulation on the internet. Featuring integrated charts, maps and metadata, users can help themselves to insights using their preferred browser, readily performing queries and selecting from a range of open standard outputs. With demand for timely information growing, SuperWEB2 offers self-service, web-based access to data for external, skilled users such as analysts, researchers and subject matter experts. Allowing government departments and other organisations to share information transparently, SuperWEB2 uses web-based ad-hoc tabulation to enable analysis across millions of table cells without compromising confidentiality. Previously, organisations offering any degree of transparency were limited to responding manually to information requests – a time consuming and often labour-intensive process.
p.mapper Download p.mapper release 4.3.1 available more... p.mapper release 4.3.0 available more... Releases at Sourceforge Electoral college reform (fifty states with equal population) / fake is the new real The electoral college is a time-honored, logical system for picking the chief executive of the United States. However, the American body politic has also grown accustomed to paying close attention to the popular vote. This is only rarely a problem, since the electoral college and the popular vote have only disagreed three times in 200 years. However, it's obvious that reforms are needed. The fundamental problem of the electoral college is that the states of the United States are too disparate in size and influence. The largest state is 66 times as populous as the smallest and has 18 times as many electoral votes.
Open source mapping software in the cloud To make it easy for you to get started with open source mapping software on own server, we provide server images including everything you need: PostGIS, MapServer, TileCache, GDAL, WFS, WMS, Elasticsearch, Leaflet and OpenLayers. Just launch an instance and start uploading your spatial data in only 5 minutes. After launch no configuration is needed, just start using your server and share maps with the world. Configuration of the servers:
Documentation API Reference This reference reflects Leaflet 0.7. Docs for 0.6 are available in the source form (see instructions for running docs). GeoSilk GeoSilk is a set of icons designed for open source web-based geospatial software. The set is an extension of Mark James's Silk icons—probably the most widely used set of icons on the web—that incorporates metaphors for spatial constructs defined by Jody Garnett's uDig icons. Take a gander at the full set or download it from the SVN repository. GeoSilk is available under a Creative Commons Attribution 3.0 License, meaning anyone may use it for any purpose and make any changes they like. Read GeoSilk: Icons for a shared geoweb on the OpenGeo Blog to learn more about this icon set.
Apache HTTP Server The Apache HTTP Server, colloquially called Apache (/əˈpætʃiː/ ə-PA-chee), is the world's most used web server software. Originally based on the NCSA HTTPd server, development of Apache began in early 1995 after work on the NCSA code stalled. Apache played a key role in the initial growth of the World Wide Web, quickly overtaking NCSA HTTPd as the dominant HTTP server, and has remained most popular since April 1996. In 2009, it became the first web server software to serve more than 100 million websites.
Santa’s Lap: Unusual Maps Of London Every day until Christmas we will be pointing you in the direction of a London-inspired Christmas gift that (with a bit of luck) you won’t already have on your list. Climb up onto our collective lap and we’ll see what we can move from our sack to your stockings… Everybody loves an old map. We know this from our page-views.