I have a map with isobaths (water depth), like in this picture, and I would like to digitize them. Is there any tool or procedure in QGIS that can recognize the lines in the picture and create a vector file automatically?

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  • Thank you but it doesn't work properly – user140119 Jun 14 '19 at 15:10
  • can you explain "but it doesn't work properly" it may be the data source needs to be modified to accommodate. – Mapperz Jun 14 '19 at 17:08
  • Raster to vector tool has not transformed lines in my picture in vector lines very well: it has created a shapefile with lines made by many small and squared polygons! My raster is a jpeg, not a geotiff. – user140119 Jun 14 '19 at 17:24
  • @Mapperz If you follow the directions in your link provided it creates polygons, some polygons as small as a pixel, where as the OP would probably like polylines. – GreyHippo Jun 14 '19 at 20:59

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