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This tutorial will show you two things: one, how to georeference an image that has no geographic reference, and two, how to, from that image, create a new shapefile with associated data. Often enough you will encounter raster files of maps or satellite images that don't have a geographic reference. And although you can add them to your map in qGIS, they will come in in the wrong location and at the wrong scale. In these cases, if you want to use these images you will have to georeference them, which means, based on other files with appropriate geographic data, move and scale these images until the fit the right location, the right orientation and the right size. In addition, once you have georeferenced these images you will probably want to digitize some part of them, creating new vector shapefiles based on these images with associated data.
Monday, February 8, 2016
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