Timeline for Vectorize raster
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 19, 2018 at 21:21 | vote | accept | Tim Autin | ||
| Sep 19, 2018 at 12:52 | answer | added | Tim Autin | timeline score: 6 | |
| Sep 18, 2018 at 14:35 | comment | added | user30184 | Perhaps you could categorize the raster date first with for example gdal_calc. Update all pixels within defined ranges to some fixed pixel values and polygonize this classified data. | |
| Sep 18, 2018 at 9:34 | comment | added | Tim Autin | Yes that's why I'd need a tool to group similar contiguous pixels (like Photoshop's magic wand). In the meantime I'm also polygonizing the USGS landuse, but it's taking ages (been running for 3 days) and it might be too detailed, less than OSM but still too much. Yes I can load the raster into Photoshop / Gimp, but I'm not an expert at it and I don't know how to achieve what I want. | |
| S Sep 17, 2018 at 18:29 | history | suggested | lambertj |
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| Sep 17, 2018 at 18:14 | comment | added | Spacedman | I doubt you'll get good results trying to vectorise it as such - its an RGB map so pretty much continuous values and no two pixels are likely to be the same to make proper polygons. How could you categorise the map to make polygons? Could you load into Photoshop/Gimp and use a colour transformation on the raster? | |
| Sep 17, 2018 at 17:58 | review | Suggested edits | |||
| S Sep 17, 2018 at 18:29 | |||||
| Sep 17, 2018 at 17:24 | history | asked | Tim Autin | CC BY-SA 4.0 |