Installation

Install GeoOS

$ go get github.com/spatial-go/geoos

Documentation

How to use GeoOS:
Example: Calculating area via GeoOS

package main

import (
    "bytes"
    "fmt"

    "github.com/spatial-go/geoos/geoencoding"
    "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)

    buf0 := new(bytes.Buffer)
    buf0.Write([]byte(polygon))
    geometry, _ := geoencoding.Read(buf0, geoencoding.WKT)

    // 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
}