In this post, I’m going to walk us through the stages of turning an image into a vector shapefile, ready to be used for other spatial analysis. ![]() In my work, I have used digitization and georeferencing for converting hand-drawn maps of neighborhood boundaries, locating voting precincts for research related to gerrymandering, and understanding changes in neighborhood planning boundaries related to zoning and land use as part of my dissertation. Another may involve understanding shifting boundaries over time. One example is sampling: you may need political or planning boundaries to sample respondents for a survey. There are a number of reasons for wanting a boundary shapefile in GIS. Have you ever been stuck on a geospatial analysis because you could only find a PDF or even paper map of what you needed? Or googled your topic followed by “shapefile” to no avail? The process of transforming a PDF, paper, or even hand-drawn map with boundaries into a shapefile for analysis is straightforward but involves several steps. But sometimes the challenge is getting your data into a form to be able to use with GIS. ![]() GIS is incredibly powerful: you can transform, overlay, and analyze data with a few clicks. ![]() From paper to vector: converting maps into GIS shapefiles
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