geoos

Geoos

Our organization spatial-go is officially established! The first open source project Geoos(Using Golang) provides spatial data and geometric algorithms. All comments and suggestions are welcome!

Guides

http://www.spatial-go.com

Contents

• Installation
• Structure
• Documentation
• Maintainer
• Contributing
• Copying

Installation

The project depends on geos (GEOS is a C++ port of the ​JTS Topology Suite), you need to complete the installation of geos first. The installation of geos:

1. Mac OS X(via brew)

$ brew install geos

1. Ubuntu or Debian

$ apt-get install libgeos-dev

1. Build from source code

$ wget http://download.osgeo.org/geos/geos-3.9.0.tar.bz2
$ tar xvfj geos-3.9.0.tar.bz2
$ cd geos-3.9.0
$ ./configure
$ make
$ sudo make install

Structure

1. Geo package contains references and calls to the GEOS C library to implement spatial operations.
2. Algorithm is the definition of spatial operation, which is outside exposing.
3. strategy.go defines the implementation of the spatial computing based algorithm.

Documentation

How to use Geoos: Example: Calculating area via Geoos

package main

import (
	"encoding/json"
	"fmt"
	"github.com/spatial-go/geoos"
	"github.com/spatial-go/geoos/encoding/wkt"
	"github.com/spatial-go/geoos/geojson"
	"github.com/spatial-go/geoos/planar"
)

func main() {
	// First, choose the default algorithm.
	strategy := planar.NormalStrategy()
	// Secondly, manufacturing test data and convert it to geometry
	const polygon = `POLYGON((-1 -1, 1 -1, 1 1, -1 1, -1 -1))`
	geometry, _ := wkt.UnmarshalString(polygon)
	// Last， call the Area () method and get result.
	area, e := strategy.Area(geometry)
	if e != nil {
		fmt.Printf(e.Error())
	}
	fmt.Printf("%f", area)
	// get result 4.0

	rawJSON := []byte(`
  { "type": "FeatureCollection",
	"features": [
	  { "type": "Feature",
		"geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
		"properties": {"prop0": "value0"}
	  }
	]
  }`)

	fc := geojson.NewFeatureCollection()
	_ = json.Unmarshal(rawJSON, &fc)
	println("%p", fc)

	// Geometry will be unmarshalled into the correct geo.Geometry type.
	point := fc.Features[0].Geometry.(geoos.Point)
	println("%p", &point)

}

Maintainer

@spatial-go。

Contributing

Thanks to OSGeo, we will also uphold the concept of "openness, co-creation, and win-win" to contribute in the field of space computing.

We use GitHub issues, but that is not a requirement. Contact us via email is also fine. Please use the GitHub issues only for actual issues. If you are not 100% sure that your problem is an issue, please first discuss this via email. If you report an issue, please describe exactly how to reproduce it.

Email Address： geoos@changjing.ai

Copying

Geoos is licensed under the: LGPL-2.1