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raster.go
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raster.go
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package gdalib
import (
"fmt"
"os"
"path/filepath"
"github.com/google/uuid"
"github.com/lukeroth/gdal"
"github.com/wgdzlh/gdalib/log"
"github.com/wgdzlh/gdalib/utils"
"go.uber.org/zap"
)
const (
METEO_TIF_X = 6939
METEO_TIF_Y = 5211
)
// 读取一般Tif
func (g *GdalToolbox) ParseRaster(tif string, buf [][]byte) (err error) {
bands := len(buf) // 需要读取的波段数
sds, err := gdal.Open(tif, gdal.ReadOnly)
if err != nil {
log.Error(g.logTag+"open tif failed", zap.Error(err))
err = ErrInvalidTif
return
}
defer sds.Close()
bc := sds.RasterCount()
if bc < bands {
log.Error(g.logTag+"tif bands not enough", zap.Int("bands", bc))
err = ErrWrongTif
return
}
log.Info(g.logTag+"start read tif", zap.Int("bands", bc), zap.Int("bufBn", bands))
for i := 1; i <= bands; i++ {
band := sds.RasterBand(i)
dt := band.RasterDataType()
x := band.XSize()
y := band.YSize()
if dt != gdal.Byte {
log.Error(g.logTag+"tif is malformed", zap.String("dataType", dt.Name()))
err = ErrWrongTif
return
}
log.Info(g.logTag+"read tif band", zap.Int("band", i), zap.Int("dt", int(dt)), zap.Int("width", x), zap.Int("height", y))
err = band.IO(gdal.Read, 0, 0, x, y, buf[i], x, y, 0, 0)
if err != nil {
log.Error(g.logTag+"read tif band failed", zap.Int("band", i), zap.Error(err))
err = ErrTifReadFailed
return
}
}
return
}
// 读取气象Tif
func (g *GdalToolbox) ParseMeteoRaster(tif string, buf []int16) (err error) {
if len(buf) != METEO_TIF_X*METEO_TIF_Y {
err = ErrWrongBufferSize
return
}
sds, err := gdal.Open(tif, gdal.ReadOnly)
if err != nil {
log.Error(g.logTag+"open meteo tif failed", zap.Error(err))
err = ErrInvalidTif
return
}
defer sds.Close()
if bc := sds.RasterCount(); bc != 1 {
log.Error(g.logTag+"meteo tif can have only one band", zap.Int("bands", bc))
err = ErrWrongTif
return
}
band := sds.RasterBand(1)
dt := band.RasterDataType()
x := band.XSize()
y := band.YSize()
if dt != gdal.Int16 || x != METEO_TIF_X || y != METEO_TIF_Y {
log.Error(g.logTag+"meteo tif is malformed", zap.String("dataType", dt.Name()))
err = ErrWrongTif
return
}
log.Info(g.logTag+"read meteo tif", zap.Int("dt", int(dt)), zap.Int("width", x), zap.Int("height", y))
err = band.IO(gdal.Read, 0, 0, x, y, buf, x, y, 0, 0)
if err != nil {
log.Error(g.logTag+"read meteo tif band failed", zap.Error(err))
err = ErrTifReadFailed
}
return
}
// 按各自有效区WKT剪切,并按目标区域WKT镶嵌多张影像tif
// 排序靠后的tif优先显示
func (g *GdalToolbox) CropRasters(tifWkt []ImgMergeFile, extWkt, out string) (err error) {
n_tif := len(tifWkt)
if n_tif == 0 {
return
}
ref, err := g.getSridRef(UNIVERSAL_SRID)
if err != nil {
return
}
tRef, err := g.getSridRef(OUTPUT_SRID)
if err != nil {
return
}
var (
ext gdal.Geometry
geo gdal.Geometry
sds gdal.Dataset
ods gdal.Dataset
dss []gdal.Dataset
part string
parts []string
opts []string
trans = gdal.CreateCoordinateTransform(ref, tRef)
tmpGeoJson = filepath.Join(g.tmpDir, fmt.Sprintf(TMP_GEOJSON, uuid.NewString()))
tmpVrt = out + "_tmp.vrt"
gc = []destroyable{trans}
)
defer func() {
for _, v := range gc {
v.Destroy()
}
os.Remove(tmpGeoJson)
for _, part := range parts {
os.Remove(part)
}
}()
isUniform := true
for i, t := range tifWkt[1:] {
if t.BandOrder != tifWkt[i].BandOrder {
isUniform = false
break
}
}
log.Info(g.logTag+"crop and merge rasters", zap.Int("tif_cnt", n_tif), zap.Bool("uniform", isUniform), zap.String("out", out))
if extWkt != "" {
if ext, err = g.parseWKT(extWkt, ref); err != nil {
return
}
gc = append(gc, ext)
if err = ext.Transform(trans); err != nil {
return
}
}
hasExt := ext != emptyGeometry && !ext.IsEmpty()
for i := n_tif - 1; i >= 0; i-- {
t := tifWkt[i]
if geo, err = g.parseWKT(t.Wkt, ref); err != nil {
return
}
gc = append(gc, geo)
if err = geo.Transform(trans); err != nil {
return
}
if hasExt {
geo = geo.Intersection(ext)
gc = append(gc, geo)
ext = ext.Difference(geo)
gc = append(gc, ext)
}
gt := geo.Type()
if (gt != gdal.GT_MultiPolygon && gt != gdal.GT_Polygon) || geo.GeometryCount() == 0 {
log.Info(g.logTag+"encounter empty cut line geo", zap.Int("idx", i), zap.String("img", t.Infile))
continue
}
if err = os.WriteFile(tmpGeoJson, utils.S2B(geo.ToJSON()), os.ModePerm); err != nil {
return
}
sds, err = gdal.Open(t.Infile, gdal.ReadOnly)
if err != nil {
return
}
part = out + fmt.Sprintf("_%d_part.tif", i)
opts = []string{"-cutline", tmpGeoJson, "-crop_to_cutline", "-overwrite", "-t_srs", fmt.Sprintf("epsg:%d", OUTPUT_SRID)}
if !isUniform && t.BandOrder != "R,G,B" { // 若通道顺序不统一,则全部输出RGB格式影像
if bands, invalid := utils.GetBasicBandIdx(t.BandOrder); invalid {
log.Error(g.logTag+"invalid band order to merge", zap.String("img", t.Infile), zap.String("bands", t.BandOrder))
continue
} else {
opts = append(opts, []string{"-b", bands[0], "-b", bands[1], "-b", bands[2]}...)
}
}
ods, err = gdal.Warp(part, nil, []gdal.Dataset{sds}, opts) // 剪切影像
sds.Close()
if err != nil {
log.Error(g.logTag+"failed to crop raster", zap.Error(err))
return
}
defer ods.Close()
parts = append([]string{part}, parts...)
dss = append([]gdal.Dataset{ods}, dss...)
}
if len(dss) == 0 {
err = ErrEmptyTif
return
} else if len(dss) > 1 {
defer os.Remove(tmpVrt)
// 将各景影像剪切结果拼接成一个VRT
if ods, err = gdal.BuildVRT(tmpVrt, dss, parts, []string{"-resolution", "highest", "-overwrite"}); err != nil {
log.Error(g.logTag+"failed to build vrt", zap.Error(err))
return
}
defer ods.Close()
}
// 将VRT转为最终GTiff
finalDs, err := gdal.Translate(out, ods, []string{"-co", "compress=lzw"})
if err != nil {
log.Error(g.logTag+"failed to translate vrt", zap.Error(err))
return
}
finalDs.Close()
return
}