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georeference.go
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/
georeference.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os/exec"
"strconv"
"strings"
)
type point struct {
Image imageCoords `json:"image"`
Geo geoCoords `json:"geo"`
}
type imageCoords struct {
X int `json:"x"`
Y int `json:"y"`
}
type geoCoords struct {
Lat float64 `json:"lat"`
Long float64 `json:"long"`
}
func georeference(pointsJSON string) error {
log.Println("Image georeferencing...")
// create points array
p, err := ioutil.ReadFile(pointsJSON)
if err != nil {
return err
}
points := []point{}
err = json.Unmarshal(p, &points)
if err != nil {
return err
}
dir := "images"
fileList := getFileList(dir)
for _, file := range fileList {
tifTranslated, err := gdalTranslate(file, points)
if err != nil {
return err
}
err = gdalWarp(tifTranslated)
if err != nil {
return err
}
}
return nil
}
func gdalTranslate(file string, points []point) (string, error) {
fileSplitted := strings.Split(file, "/")
name := fileSplitted[len(fileSplitted)-1]
newName := strings.Replace(name, "jpg", "tif", 1)
newFile := fmt.Sprintf("output/translated/%s", newName)
args := []string{"-of", "GTiff"}
for _, p := range points {
x, y := strconv.Itoa(p.Image.X), strconv.Itoa(p.Image.Y)
lat, long := strconv.FormatFloat(p.Geo.Lat, 'f', 6, 64), strconv.FormatFloat(p.Geo.Long, 'f', 6, 64)
args = append(args, "-gcp", y, x, long, lat)
}
args = append(args, file, newFile)
cmd := exec.Command(translate, args...)
var stderr bytes.Buffer
cmd.Stderr = &stderr
err := cmd.Run()
if err != nil {
log.Println(stderr.String())
return "", err
}
return newFile, nil
}
func gdalWarp(tifTranslated string) error {
tifWarped := strings.Replace(tifTranslated, "translated", "warped", 1)
args := []string{"-t_srs", "EPSG:4326", tifTranslated, tifWarped}
cmd := exec.Command(warp, args...)
var stderr bytes.Buffer
cmd.Stderr = &stderr
err := cmd.Run()
if err != nil {
log.Println(stderr.String())
return err
}
return nil
}