Eli Ribble
e48abb09c0
This calculates the summary information of data in h3 nodes and puts it in the database for fast lookup.
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
package main
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import (
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"fmt"
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"github.com/Gleipnir-Technology/go-geojson2h3"
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"github.com/tidwall/geojson"
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"github.com/uber/h3-go/v4"
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)
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func h3Indexes() []h3.Cell {
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//[] uint64{0x852a134ffffffff})
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/*result := make([]h3.H3Index, 0)
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for _, v := range values {
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result = append(result, v)
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}
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return result*/
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return []h3.Cell{
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0x8629aab2fffffff,
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0x8629a8627ffffff,
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0x8629a8607ffffff,
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0x8629a8717ffffff,
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0x8629a8617ffffff,
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0x8629a8407ffffff,
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0x8629a871fffffff,
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0x8629a845fffffff,
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0x8629aab27ffffff,
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0x8629a84e7ffffff,
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}
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}
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func h3ToGeoJSON(indexes []h3.Cell) (string, error) {
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featureCollection, err := geojson2h3.ToFeatureCollection(indexes)
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if err != nil {
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return "", fmt.Errorf("Failed to get feature collection: %w", err)
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}
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return featureCollection.JSON(), nil
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}
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func main2() {
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resolution := 9
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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)
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if err != nil {
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panic(err)
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}
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indexes, err := geojson2h3.ToH3(resolution, object)
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if err != nil {
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panic(err)
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}
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for _, index := range indexes {
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fmt.Printf("h3index: %s\n", index.String())
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}
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featureCollection, err := geojson2h3.ToFeatureCollection(indexes)
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if err != nil {
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panic(err)
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}
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fmt.Println("Polyfill:")
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fmt.Println(featureCollection.JSON())
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}
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// Given a cell at a smaller resolution remap it to the larger resolution
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func scaleCell(cell h3.Cell, resolution int) (h3.Cell, error) {
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r := cell.Resolution()
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if r == resolution {
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return cell, nil
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}
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latLong, err := cell.LatLng()
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if err != nil {
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return 0, fmt.Errorf("Failed to get latlng: %w", err)
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}
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scaled, err := h3.LatLngToCell(latLong, resolution)
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if err != nil {
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return 0, fmt.Errorf("Failed to create latlng: %w", err)
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}
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return scaled, nil
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}
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func getCell(x, y float64, resolution int) (h3.Cell, error) {
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latLng := h3.NewLatLng(y, x)
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return h3.LatLngToCell(latLng, resolution)
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}
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