Gegography

Gegography is a library for reading, manipulating and converting geographical formats, written i pure Go. Currently, support is limited to GeoJSON, WKT (Well-Known-Text) and Shapefiles (read only). I plan on implementing WKB (Well-Known-Binary).

I do not plan on supporting writing Shapefiles. Shapefile must die!

Gegography supports the following geographical types:

• Point
• LineString
• Polygon
• MultiPoint
• MultiLineString
• MultiPolygon

Currently, only XY geometries are supported.

What is it for?

I wrote Gegography primarily as a utility for processing geographical data uploaded to websites with Go backends. For example, I manage several websites with interactive mapping capabilities, and a common request is for users to be able to upload Shapefiles or GeoJSON-documents and have them automatically displayed on the map, or saved in the underlying database for viewing on demand.

With gegography you can read a Shapefile or a GeoJSON-document and easily export all features to WKT-strings for storage as geometries inside a database engine such as PostgreSQL or SQL Server.

How do I use it?

A typical use-case would look something like this (convert a shapefile to geojson)

package main

import (
	"os"
	"github.com/Froglich/gegography"
	"io/ioutil"
)

func main() {
	infile := os.Args[1]
	fc, err := gegography.ReadShapefile(infile)

	if err != nil {
		panic(err)
	}

	gj, err := fc.ToPrettyGeoJSON()

	if err != nil {
		panic(err)
	}

	err = ioutil.WriteFile(infile[:len(infile)-4] + ".geojson", gj, 0755)

	if err != nil {
		panic(err)
	}
}

Installing

Install with go get github.com/Froglich/gegography .