Popularity
0.3
Stable
Activity
10.0
Stable
3
1
0
Description
The geojson2h3 library includes a set of utilities for conversion between GeoJSON objects and H3 hexagon indexes, using uber H3 and GeoJSON.
Programming language: Go
License: MIT License
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README
go-geojson2h3
The geojson2h3 library includes a set of utilities for conversion between GeoJSON Objects:
- Point, MultiPoint,
- LineString, MultiLineString
- Polygon,MultiPolygon
- GeometryCollection
- Feature,FeatureCollection
- Circle
and H3 hexagon indexes, using: H3-GO and GeoJSON
Installation
$ go get github.com/mmadfox/go-geojson2h3
API
// ToH3 converts a GeoJSON objects to a list of hexagons with specified resolution.
ToH3(resolution int, o geojson.Object) (indexes []h3.H3Index, err error)
// ToFeatureCollection converts a set of hexagons to a GeoJSON `FeatureCollection`
// with the set outline(s). The feature's geometry type will be `Polygon`.
ToFeatureCollection(indexes []h3.H3Index) (*geojson.FeatureCollection, error)
Examples
- [Point, MultiPoint](examples/point.go)
- [LineString, MultiLineString](examples/line.go)
- [Polygon,MultiPolygon](examples/polygon.go)
- [GeometryCollection](examples/collection.go)
- [Feature,FeatureCollection](examples/feature.go)
- [Circle](examples/circle.go)
- [Rect](examples/rect.go)
package main
import (
"fmt"
"github.com/mmadfox/go-geojson2h3"
"github.com/tidwall/geojson"
"github.com/uber/h3-go/v3"
)
func main() {
resolution := 9
object, err := geojson.Parse(`{"type":"FeatureCollection","features":[{"type":"Feature","properties":{"shape":"Polygon","name":"Unnamed Layer","category":"default"},"geometry":{"type":"Polygon","coordinates":[[[-73.901303,40.756892],[-73.893924,40.743755],[-73.871476,40.756278],[-73.863378,40.764175],[-73.871444,40.768467],[-73.879852,40.760014],[-73.885515,40.764045],[-73.891522,40.761054],[-73.901303,40.756892]]]},"id":"a6ca1b7e-9ddf-4425-ad07-8a895f7d6ccf"}]}`, nil)
if err != nil {
panic(err)
}
indexes, err := geojson2h3.ToH3(resolution, object)
if err != nil {
panic(err)
}
for _, index := range indexes {
fmt.Printf("h3index: %s\n", h3.ToString(index))
}
featureCollection, err := geojson2h3.ToFeatureCollection(indexes)
if err != nil {
panic(err)
}
fmt.Println("Polyfill:")
fmt.Println(featureCollection.JSON())
}
Contributing
Pull requests and Github issues are welcome. Please include tests for new work, and keep the library test coverage at 90-100%.