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GIS and Web Mapping news and tips
I have decided to move on from hosting on wordpress.com, so my RSS feed has changed to http://blog.timwarr.net/?feed=rss2 Please update the feed you consume.
The blog blog itself remains on blog.timwarr.net (minus the redirect to wordpress.com).
var locations = new Array(); var xy1 = new MMPoint(523000,212324); // OSTN97 OS National Grid var xy2 = new MMPoint(323000,212324); var xy3 = new MMPoint(423000,212324); locations.push(xy1); locations.push(xy2); locations.push(xy3); var funcRef = convertResultsLoaded; var converter = new MMConverter( funcRef ); converter.convert(locations, 'osng'); function convertResultsLoaded() { console.log(converter.result_set); };
A while ago I blogged about using OS Grid References in the Multimap API. Web mapping developers in the UK often grew up with Ordnance Survey (OS) maps, are used to using the associated OS grid references (rather than lat/lon) to specifiy location and want to use them in mapping APIs.
Previously Multimap released a new feature in the API to allow developers to convert grid references to lat/lon for use in the API. Multimap have a fantastic technical writing team and they have just released documentation on this feature (which is called Coordinate Transformation).
The documentation on how to use the features in the Multimap JavaScript API is here and the documentation on how to use the features with the Multimap Web Services is here.
Thanks to Manu Gaur for this great documentation.
Happy coordinate transforming!

Today (1st December) is world AIDS day.
The AidsInAfrica.net site has an interesting animated map here which shows an interesting time animation of the increase in HIV infections. It is sobering stuff and a nice example of the power of simple maps.