package com.moon.server.service.data;
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import com.moon.server.entity.all.StaticData;
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import com.moon.server.entity.data.MetaFileEntity;
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import com.moon.server.helper.StringHelper;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.gdal.gdal.ColorTable;
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import org.gdal.gdal.Dataset;
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import org.gdal.gdal.gdal;
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import org.gdal.gdalconst.gdalconst;
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import org.gdal.ogr.Geometry;
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import org.gdal.ogr.ogr;
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import org.gdal.osr.SpatialReference;
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import org.springframework.stereotype.Service;
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import java.io.File;
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/**
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* 栅格服务
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* @author WWW
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* @date 2023-08-25
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*/
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@Service
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public class RasterService {
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private SpatialReference sr4326;
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private SpatialReference sr4490;
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private SpatialReference sr104903;
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private final static Log log = LogFactory.getLog(RasterService.class);
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/**
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* 初始化空间引用
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*/
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private void initSpatialReference() {
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if (null == sr4326) {
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sr4326 = new SpatialReference();
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sr4326.ImportFromEPSG(StaticData.I4326);
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sr4490 = new SpatialReference();
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sr4490.ImportFromEPSG(StaticData.I4490);
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sr104903 = new SpatialReference(StaticData.MOON_2000_WKT);
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}
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}
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/**
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* 读取栅格信息
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*/
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public void readRasterInfo(MetaFileEntity mf, String file) {
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Dataset ds = null;
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try {
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File f = new File(file);
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if (!f.exists() || f.isDirectory()) {
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return;
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}
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ds = gdal.Open(file, gdalconst.GA_ReadOnly);
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if (null == ds || ds.getRasterCount() == 0 || null == ds.GetSpatialRef()) {
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return;
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}
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SpatialReference sr = ds.GetSpatialRef();
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// 坐标系统
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mf.setCoorSys(sr.GetName());
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if (StaticData.MOON200.equals(mf.getCoorSys())) {
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// EPSG编码
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mf.setEpsg("EPSG:" + StaticData.I104903);
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} else {
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// EPSG编码：PROJCS、GEOGCS、GEOGCS|UNIT 或 NULL
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String code = sr.GetAuthorityCode(null);
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mf.setEpsg(StringHelper.isEmpty(code) ? null : "EPSG:" + code);
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}
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// 行列数
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mf.setGridsize(String.format("%d,%d", ds.getRasterXSize(), ds.getRasterYSize()));
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// 波段数
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mf.setBands(String.valueOf(ds.getRasterCount()));
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// 数据类型
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int dataType = ds.GetRasterBand(1).GetRasterDataType();
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mf.setBandType(getDataType(dataType));
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// 数据颜色表
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ColorTable colorTable = ds.GetRasterBand(1).GetRasterColorTable();
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mf.setCt(null == colorTable ? null : colorTable.toString());
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// 高程基准
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mf.sethDatum(null);
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// 分辨率
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double[] tr = new double[6];
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ds.GetGeoTransform(tr);
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mf.setResolution(String.format("%f,%f", tr[1], tr[5]));
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if (tr[StaticData.I0] == 0.0 && tr[StaticData.I1] == 1.0 && tr[StaticData.I2] == 0.0 && tr[StaticData.I3] == 0.0 && tr[StaticData.I4] == 0.0 && tr[StaticData.I5] == 1.0) {
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return;
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}
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Geometry minPoint = getMinPoint(ds);
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Geometry maxPoint = getMaxPoint(ds);
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double xmin = minPoint.GetX(0);
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double ymin = minPoint.GetY(0);
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double xmax = maxPoint.GetX(0);
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double ymax = maxPoint.GetY(0);
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// 四至范围
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String geom = String.format("ST_GeomFromText('POLYGON ((%f %f,%f %f,%f %f,%f %f,%f %f))')", xmin, ymax, xmax, ymax, xmax, ymin, xmin, ymin, xmin, ymax);
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mf.setGeom(geom);
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} catch (Exception ex) {
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log.error(ex.getMessage(), ex);
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} finally {
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if (null != ds) {
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ds.delete();
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}
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}
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}
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/**
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* 获取数据类型
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*/
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private String getDataType(int dataType) {
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if (dataType == gdalconst.GDT_Byte) {
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return "GDT_Byte";
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}
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if (dataType == gdalconst.GDT_UInt16) {
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return "GDT_UInt16";
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}
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if (dataType == gdalconst.GDT_Int16) {
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return "GDT_Int16";
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}
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if (dataType == gdalconst.GDT_UInt32) {
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return "GDT_UInt32";
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}
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if (dataType == gdalconst.GDT_Int32) {
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return "GDT_Int32";
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}
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if (dataType == gdalconst.GDT_Float32) {
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return "GDT_Float32";
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}
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if (dataType == gdalconst.GDT_Float64) {
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return "GDT_Float64";
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}
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if (dataType == gdalconst.GDT_CInt16) {
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return "GDT_CInt16";
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}
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if (dataType == gdalconst.GDT_CInt32) {
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return "GDT_CInt32";
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}
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if (dataType == gdalconst.GDT_CFloat32) {
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return "GDT_CFloat32";
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}
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if (dataType == gdalconst.GDT_CFloat64) {
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return "GDT_CFloat64";
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}
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return null;
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}
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/**
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* 获取Dataset的最小点
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*/
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private Geometry getMinPoint(Dataset ds) {
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double[] transform = new double[6];
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ds.GetGeoTransform(transform);
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double xMin = transform[0];
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double yMin = transform[3] - ds.getRasterYSize() * transform[1];
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Geometry point = new Geometry(ogr.wkbPoint);
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point.AddPoint(xMin, yMin, 0);
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return transform(ds, point);
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}
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/**
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* 获取Dataset的最大点
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*/
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private Geometry getMaxPoint(Dataset ds) {
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/**
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* transform[0] 左上角x坐标
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* transform[1] 东西方向分辨率
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* transform[2] 旋转角度, 0表示图像 "北方朝上"
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*
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* transform[3] 左上角y坐标
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* transform[4] 旋转角度, 0表示图像 "北方朝上"
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* transform[5] 南北方向分辨率
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*/
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double[] transform = new double[6];
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ds.GetGeoTransform(transform);
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double xMax = transform[0] + (ds.getRasterXSize() * transform[1]);
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double yMax = transform[3];
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Geometry point = new Geometry(ogr.wkbPoint);
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point.AddPoint(xMax, yMax, 0);
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return transform(ds, point);
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}
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/**
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* 坐标转换
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*/
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private Geometry transform(Dataset ds, Geometry point) {
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this.initSpatialReference();
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point.AssignSpatialReference(ds.GetSpatialRef());
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if (ds.GetSpatialRef().IsGeographic() > 0) {
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return point;
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}
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String srsName = ds.GetSpatialRef().GetName();
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if (srsName.contains(StaticData.CGCS2000)) {
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point.TransformTo(sr4490);
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} else {
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point.TransformTo(sr4326);
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}
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point.SwapXY();
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return point;
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}
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}
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