According to CNN, Dutch law changed in 2013 to lift this censorship, and the Netherlands have become considerably clearer since. On Google Earth, the country was dotted with pixelated splotches covering military bases, government buildings and more. Today, this process is largely automated as tech giants such as Bing, Google and Apple, use algorithms that grab satellite data and ground measurements from a variety of datasets to keep maps updated - meaning that they can usurp state topographical organisations.The Dutch are rather famous in satellite-imagery-loving circles for their enthusiastic pixelation. Then, when flight became more common, topographical services began the practice of photogrammetry, where stereo images - image pairs that are slightly offset from each other - were compared using a stereoscope which then informed the creation of a topographic map. In a pre-digital era, map surveyors would have been out on foot taking measurements and recording where things were in particular locations, which were then relayed to a map draughtsperson - usually part of a state topographical service. To begin to understand what prompts people to hide things on digital maps, it pays to take a step back to understand how cartography happens today. Prior to GPS, illustration and aerial photography provided the bulk of cartographic information.
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