I use QGIS 3.6 on Windows and I have been trying to convert raster images into shapefiles. I managed to do that for Digital Terrain Models only, using the conversion --> vectorize tool in the qgis toolbar.
An example of images I want to convert into shapefile can be found in this link https://www.uahirise.org/ESP_040921_1985. How do I achieve that?
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and reduce the resolution.Raster - Conversion - Translate