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What satellite images (or other types of remote sensing) can do for an urban planner (when looking at green space) is to give them a really accurate look at what their city looks like -- it gives them a bird's eye view of the layout of the city.
With photographs from satellites or even airplanes, a planner can see exactly how the current green spaces in a city are laid out and where they are in relation to one another. The planner can try to link separate green spaces into green belts, for example, or can identify areas of a city that are in need of green space.
If the planner has access to images that show temperatures, the planner can also see where more green space might be useful to help lower temperatures.
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