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I have a geotiff that I have been working with in tilemill and I would like to select portions (buildings) in the map and create new layers as geojson objects. My issue is I don't know how to get the coordinates to create the objects!

http://chimera.labs.oreilly.com/books/1230000000345/ch12.html#_choropleth

this is a link to what I'm trying to do with states I just need the step where the coordinates are gotten because it doesn't seem to be in this document, they just give a shout to the guy who defined them. If anyone has done something similar to this, please give me a shout!

TO CLARIFY

I am not looking for the coordinates for the 50 states, I am trying to create geojson objects for a FICTIONAL map.

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  • are you trying to convert the picture of the buildings in your geotiff into vectors (to then be converted to geojson)? Commented May 27, 2014 at 18:25
  • I am very new to this process. I do think yes though, there are buildings that are part of the geotiff and I would like to get them as geojson objects. If converting them to vectors is the way to go what is the approach? Commented May 27, 2014 at 18:28
  • If your geotiff is a satellite image, then yes, you'll either have to trace them into a vector dataset / layer (to then convert to geojson)... or some automated process that someone might be able to help you with (ie. image classification)... Commented May 27, 2014 at 18:36
  • Thank you, what would be a good tool to use for this? I'm only looking for barebones, I don't need the color, edges or anything within the object, just its coordinates Commented May 27, 2014 at 18:45
  • How many features are you looking to extract / convert? Commented May 27, 2014 at 18:54

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I recommend you to use QGIS.

  • You can upload your GeoTiff.
  • Draw some objects.
  • Export them as GeoJSON or something else.

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