turfjs | 易学教程

Remove points of polylines that are outside of polygon using Leaflet

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问题 I've draw polyline programmatically (not using leaflet draw) inside polygone using leaflet draw plugin on map, I want to keep only the points of polyline that are inside of polygone and remove those are outside. Do you have any idea how to do that using a leaflet plugin?. Any help is much appreciated. Thanks Here is a screenshot: The expected result: I did research on difference method of **turf" library as @Sam suggested, so finaly I can apply this method on my drawing polygon and line, here

Find co-ordinates where LineString intersects a Polygon border in turfjs

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问题 Is there a way in Turfjs to determine the co-ordinates at which a LineString intersects with the border of a polygon? There's a number of ways to find out if a point is within a polygon and a number of ways to find out if a point is on a line and so on, but I can't seem to figure out a way to ask "at what point does this line intersect this polygon's border" . I could enumerate the points in the polygon using a line intersection algorithm to find that point but I was wondering if there's a

3D Extrusion with mapbox based on local geojson file

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I have seen this example online which does data-driven building extrusion but doesn't provide the code at all. I would very much like to achieve the same thing. I have a geojson file with some kind of attribute that I would like to map onto the building's height. Would you know how that is possible? I have considered the recommended alternative : doing 3D extrusions on circles that are already generated based on my data. The code on this blog post is not provided and so I sued the code this SO post . The code goes like this: <html> <head> <meta charset='utf-8' /> <title>Display buildings in 3D

3D Extrusion with mapbox based on local geojson file

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问题 I have seen this example online which does data-driven building extrusion but doesn't provide the code at all. I would very much like to achieve the same thing. I have a geojson file with some kind of attribute that I would like to map onto the building's height. Would you know how that is possible? I have considered the recommended alternative: doing 3D extrusions on circles that are already generated based on my data. The code on this blog post is not provided and so I sued the code this SO

Attempting to a configurable attribute of a configurable property Issue-in turfJS?

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I have an issue with @turf/turf the last version, in my react native app "react-native": "0.58.0", "@turf/turf": "^5.1.6" I just followed the same example in the README.md but it's not working with me anymore. The issue is when I import turf like this import * as turf from '@turf/turf'; and write the function here is handleNearby = () => { const { region, providers } = this.state; let currentPoint = [region.longitude, region.latitude] let points = _.map(providers, p => { console.log('@p', p); const to = [p.coordinates.longitude, p.coordinates.latitude]; const distance = turf.distance

Attempting to a configurable attribute of a configurable property Issue-in turfJS?

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问题 I have an issue with @turf/turf the last version, in my react native app "react-native": "0.58.0", "@turf/turf": "^5.1.6" I just followed the same example in the README.md but it's not working with me anymore. The issue is when I import turf like this import * as turf from '@turf/turf'; and write the function here is handleNearby = () => { const { region, providers } = this.state; let currentPoint = [region.longitude, region.latitude] let points = _.map(providers, p => { console.log('@p', p);