GPS i Kina

Jeg har aldrig været i Kina og har derfor ikke oplevet problemerne med GPS der. Jeg vidste heller ikke at det er tilsigtet at GPS i Kina skal give unøjagtige resultater, sikkert ud af et paranoidt tankesæt om national sikkerhed:

It is, in fact, illegal for foreign individuals or organizations to make maps in China without official permission. As stated in the “Surveying and Mapping Law of the People’s Republic of China,” for example, mapping—even casually documenting “the shapes, sizes, space positions, attributes, etc. of man-made surface installations”—is considered a protected activity for reasons of national defense and “progress of the society.” Those who do receive permission must introduce a geographic offset into their products, a kind of preordained cartographic drift. An entire world of spatial glitches is thus deliberately introduced into the resulting map.
— Geoff Manaugh, “Why You Can’t Trust GPS in China

Det betyder vel også at det er umuligt for andre end regeringen at vide hvor el-, vand-, varme-, kloak- og olieledninger befinder sig, hvor vandboringer er lavet etc. Og som udlænding skal man passe meget på hvad man kommer til at registrere, hvilket nogle britiske geologistuderende oplevede for nogle år siden.

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