add converter png2bin.go

converter/png2bin.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"image/png"
+	"os"
+	"regexp"
+	"strconv"
+)
+
+func main() {
+	filePng, err := os.Open(os.Args[1])
+	re, _ := regexp.Compile("ASTGTM2_(...)(....)_dem")
+	submatch := re.FindSubmatch([]byte(os.Args[1]))
+	lat := (string)(submatch[1])
+	lon := (string)(submatch[2])
+	fmt.Println(lat,lon)
+
+	if err != nil {
+		fmt.Println(err)
+	}
+	defer filePng.Close()
+	img, err := png.Decode(filePng)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	var w bytes.Buffer
+
+	for a := 0; a < 10; a++ { // cut one image to 100 dat file (10 * 10 mesh)
+		for b := 0; b < 10; b++ {
+			fileDat,err:=os.Create(os.Args[2]+"/"+lat+lon+strconv.Itoa(a)+strconv.Itoa(b))
+			if err !=nil{
+				fmt.Println(err)
+				os.Exit(1)
+			}
+			for i := a * 360; i < (a+1)*360; i++ {
+				for j := b * 360; j < (b+1)*360; j++ {
+					gray, _, _, _ := img.At(i, j).RGBA()
+					binary.Write(&w, binary.LittleEndian, int16(gray))
+				}
+			}
+			w.WriteTo(fileDat)
+			fileDat.Close()
+		}
+	}
+}