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A vector data storage format for storing the location, shape, and attributes of geographic features. Often referred to as 'an ESRI shapefile', as ESRI developed it.

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Are long lines in shapefiles to be considered geodesics or straight lines in the 2D latlong ...

It seems to be a straight line in whatever projection system pertains when it is created. After that, it is recalculated in each new projection, and the software trys to make it 'stratght'. this is qu …
Mark Denil's user avatar