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Archives for July, 2005


Barry Hunter over at the Google API discussion list has pointed that my conversion routine is not wholly accurate. I am only converting OSGB “grid refs” not the full OSGB36 to latitude and longitude. If I ever get time I will use the OS spreadsheet calcs to implement a full conversion. I thought I might […]


I have posted up a link (look under the ‘Pages’ heading) to a javascript class I have written called GeoPosition. This will convert coordinates between OSGR and WGS84 formats. WGS84 is the format google maps uses to plot points. Here you are. Code fix – The function calculateZoomLevel will now set the zoom level correctly […]

VMS Finally

The VMS (Variable Message Sign) data is finally up and working. I had to filter the data heavily to avoid sign overload. Basically what is shown is every ‘unique’ message for each road and lane. This is to avoid displaying the same message all the way up and down the motorway. Some of the icons […]

Future Developments

There has been little changes to the site since last week because I have been working furiously to try and map the QMISS Midas speed sensor data on the the map. This _still_ isn’t in a useful state but I have developed the filtering code which should let me finally plot the VMS motorway sign […]

Regional Data Update

I have rushed through the collection and processing of the regional traffic and public transport data partly because I thought it might prove useful and also because I am going away this weekend and will not have time to put any work into it. Alas the upshot is that there appears to be a bug […]

Frozen Events

Looks like the bbc have discontinued or altered the updating mechanism of the traffic and transport tpeg xml feeds. This is why there are still events hanging around from Jun 30th on the map. I guess I will have to do what I have been meaning to for ages and process the data on a […]

Site Update to new API

Site has been updated to use new Google Map API. There are a few things which don’t seem to work very well but I guess it’s early days. My attempt to set the zoom level from the span of points is a bit rubbish but it works well enough for a first stab. The other […]