[GIS] Adding turf.js polygons from shapefiles

geojsonshapefileturf

I'd like to know if there is any tool I can use to import polygons from a shapefile.

Is there any way to import a feature class in turf format or I should use GeoJSON?

Best Answer

You can convert shapfiles to geojson using shapefile-js library or other similar libraries, in the browser without making any server calls.

then use that geojson data with Turf.js

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[GIS] How to clean/fix polygons in a Node.js application

Although I am not cleaning up Polygons I have found a better approach. As users gather data for the polygon I think it may be better to simply collect all points and then use turf.concave to draw a Polygon. Technically it is not 100% accurate but given the jumpy GPS signals the solution is good enough for me.

[GIS] How to obtain geojson geometry ? OL3

You don't provide the "right" content to Turf (your geom is not the expected content for Turf)

feats = select2.getFeatures();

var geojson  = new ol.format.GeoJSON();

as_geojson = geojson.writeFeatures(feats, {
  featureProjection: 'EPSG:3857',
  dataProjection: 'EPSG:4326'
});

turf.buffer(as_geojson, 20, 'kilometers');

You can also see this demo I've made months ago and this other official one.

If you don't use extensively Turf, it's also possible to use JSTS (JavaScript Topology Suite), a library to manipulate geometry in JavaScript. A demo with buffer is available at the official website.

Best Answer

Related Solutions

[GIS] How to clean/fix polygons in a Node.js application

[GIS] How to obtain geojson geometry ? OL3

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