Is there some database with official information about medical centers, schools, POI's and their geo coordinates for all countries in the world? It doesn't have to be free, but I need the GEO coordinates as well, because I need to connect them to my products!
I think your best chance is OpenStreetMap, e.g.
For a list of options for the amenity tag, check http://wiki.openstreetmap.org/wiki/Category:En:Key:amenity
I don't know what commercial POI databases are out there, but I doubt that one would cover all countries and topics you're looking for world-wide.
"Points of interest" is a very subjective thing, it depends on the domain of your interest. Also, I doubt you'll find anything "official".
The closest thing would be OpenStreetMap, but you should be aware of certain things:
- The global coverage is not even: some countries are super-covered (Germany, UK) while others are less so.
- Getting to OSM data could prove to be a challenge: the global database file is quite large (15-20 GB zipped) and you only really need a small part of it concerning POIs. There are various ways to extract the data, but none of them are easy or fast. You could pay someone to do it for you, of course.
- Tagging of POIs in OSM is pretty liberal, so you'll have to do some data mining before getting the results you want.
August 1, 2011 blog posting:
"SimpleGeo’s CC0 Places data set is now available for download at no cost. If you’d like to get your hands on 21M+ POIs that cover 63 countries, we’re ready to hand that over to you in one file. The file is about 2GB in .ZIP format, and remember, with the CC0 license, this data becomes yours – free and clear – to do whatever you want. We hope you do awesome things with it!"
The very easy way to get this is with the Mapquest XAPI API: http://developer.mapquest.com/web/products/open/xapi You supply a query, a bounding box, and get back very simple XML. Tags look like:
Learn more on the OpenStreetMap Wiki. Or seek out CloudMade where you can click and drag to make a custom map, then click to select which points of interest (e.g. schools, hospitals) you'd like shown also.