Make it clear in the readme that geojson option doesn't support GeometryCollection

[Monduiz]

I am trying to calculate the number of buildings in a geometry.

When I run index.js, I get "error: geometry not implemented at Object.getTiles [as tiles]" in module 'tile-cover, index.js:84' .
I checked the GeoJson and it seems valid. It was created in QGIS and I have tested it in mapshaper.

I have tested and tried with different geojsons, all valid. I always get the same error from tile-cover.

The scripts are here.
Data is canada.mbtiles (not uploaded).

[mourner]

This happens because tile-cover doesn't support geometry collections. Your script will work if you remove the collection wrapper from Ottawa.json (making it just a MultiPolygon).

We should add a note in the readme stating that geometry collections are an exception in the geojson option.

[Monduiz]

Thanks @mourner. I modified the GeoJson to MultiPolygon with OttawaMP.json and did a test. Now I am getting a Unsupported MBTiles format: undefined error. I checked the geojson and its working everywhere else.

I am stumped. I will need to test again from scratch. I am not sure what I am doing wrong.

[Nerdyvedi]

@Monduiz . Were you able to solve this ? I am getting the same error. Not sure if you would still remember how you solved it though

[Monduiz]

@Nerdyvedi It has been awhile but if I remember I decided to do it differently than with this library. Once you have geojsons, it was trivial to get what I needed. Basically, I wrote a script that extracted features I need from OSM and then made my calculations in R. I don't know if this will be useful to you but you can see the code and final project here:

buildings monitoring with OSM

Honestly, today I probably would write a Django app with a backend that pulls all this in PostGIS.

[Nerdyvedi]

@Monduiz Thank you so much for your help.