GOOD On Tuesday, July 13, 2021 at 8:41:14 AM UTC+5:30 nikh...@gmail.com wrote:
> Hi All, > > Sharing about a recent collaboration I did with Rajesvari Parasa to turn a > development plan PDF into an web based interactive map. Spinoffs from here > may be useful to the data community. > > Here's the output: > https://draftmpd41.github.io/ > > > > > Sharing what went into it: > > 1. Extracting from PDF > - It's one of those PDFs exported from Autocad or so where you can see > multi-layers and turn them on or off. > - Rajesvari used a command-line GIS tool called "ogr2ogr > <https://duckduckgo.com/?t=lm&q=ogr2ogr&ia=web>" to extract individual > layers from the PDF into .geojson shapefiles. > - There was a tricky bit where the output lat-longs were all like > (716882.20,3166456.28) - a different CRS and we didn't know which. > - I used http://projfinder.com/ to find it, then Rajesvari included CRS > conversion into the ogr2ogr commands to produce proper shapefiles. > - You can see all that in this repo: > https://github.com/draftmpd41/layers_draft_delhi_master_plan_2041 - see > the .bat file for the ogr2ogr commands > > > 2. Poor person's GIS system > - I cobbled together a static website (html + vanilla javascript) that > mimics those geoserver-driven multiple-layers-groups sites like we see at > Bhuvan and various municipal corporations' GIS portals. > - Code: https://github.com/draftmpd41/draftmpd41.github.io > - Parameterised the whole thing: By editing a small JS file and CSV table, > you can repurpose this to make it yours. > - The site is static, as in: no backend. Can run it anywhere. > - Loads layers only when user clicks on them first time. So, site loads > quickly even if data is heavy. > - Disclaimer: if you don't want your site visitors grabbing all the data, > then please go the geoserver way. This one's for open sharing (F12 > > Network > XHR) > > > 3. Developed but not deployed: Citizens inputs layer > - Here, I added in a citizens' inputs form to capture geo-located > comments. The comments go to a backend program where they're saved in a > basic MySQL DB. > - We haven't activated this because there aren't any people on board to > admin the thing (moderation, spam prevention etc - nightmare). > - But the setup is simple and can be useful for others who want to do > this, so sharing it. > - Frontend with additional section and inputs layer: > https://github.com/draftmpd41/frontend-with-inputs > - Backend code: https://github.com/draftmpd41/draftmpd41_backend (in > python3) > - It's setup such that frontend and backend can be hosted separately. > - Disclaimer. It's simple and basic. No user accounts or spam prevention. > Moderation would have to be through phpMyAdmin on the backend server. > > -- > Cheers, > Nikhil VJ > https://nikhilvj.co.in > -- Datameet is a community of Data Science enthusiasts in India. Know more about us by visiting http://datameet.org --- You received this message because you are subscribed to the Google Groups "datameet" group. To unsubscribe from this group and stop receiving emails from it, send an email to datameet+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/datameet/c8e88b31-be2a-4f38-be51-f9ab91b07f6fn%40googlegroups.com.
