add dem

pkg/utils/tiff.go

@@ -150,3 +150,27 @@ func setGeoTransform(ds *godal.Dataset, topLeftLng, topLeftLat, resolution float
 	ds.SetMetadata("TIFFTAG_DATETIME", time.Now().String())
 	ds.SetMetadata("TIFFTAG_SOFTWARE", "StarWiz-SJY01-IMAGE-PROC")
 }
+
+func ReadTiff(tifFile string) ([][][]float32, error) {
+	hDataset, err := godal.Open(tifFile)
+	if err != nil {
+		return nil, err
+	}
+
+	var data [][][]float32
+	for _, band := range hDataset.Bands() {
+		structure := band.Structure()
+		var dataBand [][]float32
+		for y := 1; y <= structure.SizeY; y++ {
+			scanline := make([]float32, structure.SizeX)
+			err = band.Read(0, y, scanline, structure.SizeX, 1)
+			if err != nil {
+				return nil, err
+			}
+			dataBand = append(dataBand, scanline)
+		}
+
+		data = append(data, dataBand)
+	}
+	return data, nil
+}