![]() ![]() 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. 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. First thing's first: head to the Google Earth address, whether on mobile or desktop, which is at It will automatically adapt for what you're using to view, but we find. 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. The others are still on-orbit enriching historical collections with the latest remote sensing data (optical and radar). 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. Google satellite picture of my house Why are old satellite images black and white The infographic below provides a better idea of when the launches and completions occurred. ![]() Prior to GPS, illustration and aerial photography provided the bulk of cartographic information. ![]()
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