As part of our ongoing efforts at making sense of the Tenders Electronic Daily procurement contracts, I had to get hold of historical exchange rates to convert the values of all the contracts into a comparable form. Professor Werner Antweiler at The University of British Columbia maintains a very impressive, free database of exactly this [...]
You may remember my last post on this topic ended with a question. Just to recap, we have a table with a lot of rows that have geographical coordinates and we want to find a random subset that lies in a given map window. The problem with the query demonstrated last was that there are [...]
… or parts of it anyway.
The European Union is generally up to lots of weird and wonderful things, one of the more esoteric being the “Tenders Electronic Daily” (TED) database. Basically, all public procurement above a certain value has to go through this database so that companies from all over the world have a fair [...]
A few days ago, I posted a video showing public procurement expanding geopraphically with the EU enlargements in the ’00s. There weren’t any borders, but you could sort of see the outline of Europe and how the dots spread east with time.
Adding actual borders to the map proved very frustrating. The Geographical Information System (GIS) [...]
I did a video showing the geographical spread over time of authorities buying stuff through the EU public procurement system. We managed to hijack all the contracts some time ago and the addresses of the authorities and the winning contractors have now all been geocoded. You can also explore the data on the TEDBot website.
The [...]
UPDATE: Better solution here.
Here’s the scenario: You have a lot (a million+) of geotagged addresses in a database and you want to show them as markers on Google Maps. Some further requirements are:
You only want to show some constant (10) amount at any given time, since too many markers clutters the map and kills the [...]
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