[HN Gopher] Watertight vector maps from raster images ___________________________________________________________________ Watertight vector maps from raster images Author : xk3 Score : 68 points Date : 2021-04-10 14:22 UTC (8 hours ago) (HTM) web link (mzucker.github.io) (TXT) w3m dump (mzucker.github.io) | NegativeLatency wrote: | This is an interesting read, but illustrator can also generate | vectors from a raster image with a couple of clicks and parameter | tuning | vanderZwan wrote: | The author addresses this: | | > _There already exist tools to automatically convert raster | (bitmap) images to vector formats, including Adobe | Illustrator's Live Trace /Image Trace tools or standalone | programs like Peter Selinger's potrace, which provides the | comparable functionality in Inkscape._ | | > _However, all of these tools share a common shortcoming from | the perspective of mapmaking - given a simple raster line | drawing(...) they actually produce two contours, one for the | inside, and one for the outside._ | detritus wrote: | Thank you so much for your comment! It made me dig into the | article a bit and appreciate that this could be really handy | for me. I do a lot of conversion of bitmap designs in | Illustrator and this two-path problem is frequently something | I abut against. | | Time to learn how to use Python! | Waterluvian wrote: | Given the power of Openlayers + JSTS I'm a bit surprised nobody | has built a general purpose WebGIS app. | | QGIS is often too heavy or inaccessible. And I believe that GIS | is something everyone can do. You don't need a fancy degree and | training to explore spatial data and build maps. | | I tried once but quickly realised it was beyond the scope of a | part time project. | noughtme wrote: | Check out https://kepler.gl by Uber. Allows you to some basic | GIS map based data exploration. Their deck.gl library is pretty | nice if you need to add GIS data to your web app. | kylebarron wrote: | The lead of kepler.gl and several contributors to deck.gl | left Uber last year to start Unfolded [0], a web-based | geospatial platform. | | [0]: https://www.unfolded.ai/studio | | (Disclaimer: I work at Unfolded) | samstave wrote: | Thats AWESOME. | | This Map is DOPE | | https://studio.unfolded.ai/public/0c825631-2000-4ea7-a43f-a | 5... | | https://i.imgur.com/5E6ancZ.png | | --- | | However - it would be a lot better when you add another | layer, that for, say an ARC layer, you should be able to | click on the Source HEX, and then the Dest HEX - or Paste | the HEX ID into the field, currently it demands LAT-LON for | source and destination.... IT looks like it tries - But I | cant seem to correctly apply it? | | https://i.imgur.com/j8ttNfS.png | chiubaca wrote: | Ive been wondering the same thing. especially when u see what | can be done with WASM in apps like Figma. I believe most of the | QGIS code base is c++ so i wonder if it's just a case writing a | bunch of js, wasm glue code to make this a reality... | Waterluvian wrote: | That's a really interesting thought. I think it would be | worth seeing if OGR/GDAL can be ported to wasm. | | Next would be GRASS. | | JSTS is pure JS and does a lot of vector GIS fine. | | I think those three things and a decent UI would be an | absolutely killer Web app for the general public to do more | GIS. | kylebarron wrote: | Yep, here's GDAL ported to WASM | https://github.com/ddohler/gdal-js ___________________________________________________________________ (page generated 2021-04-10 23:00 UTC)