public String getAltitude(List<String> strPoints) throws IOException, TransformException {
String demPath = "G:/weitu/download/xian/xian.tif";
// String demPath = "F:/Data/yanta/YanTaDOM.tif";
File file = new File(demPath);
Hints tiffHints = new Hints();
tiffHints.add(new Hints(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE));
// 默认坐标系EPSG:3857
//tiffHints.add(new Hints(Hints.DEFAULT_COORDINATE_REFERENCE_SYSTEM, CRS.decode("EPSG:4326")));
tiffHints.add(new Hints(Hints.DEFAULT_COORDINATE_REFERENCE_SYSTEM, DefaultGeographicCRS.WGS84));
GeoTiffReader tifReader = new GeoTiffReader(file,tiffHints);
GridCoverage2D coverage = tifReader.read(null);
RenderedImage sourceImage = coverage.getRenderedImage();
PlanarImage planarImage = (PlanarImage)sourceImage;
//获取左上右下，包含仿射影子的左上角
Envelope env = coverage.getEnvelope();
//创建输出tif
String outputPath = "D:/testTiff.tif";
float[][] slopeData = new float[1000][1000];
for(int i=0;i<1000;i++){
for(int j=0;j<1000;j++)
slopeData[i][j] = i+j;
}
GridCoverageFactory factory = new GridCoverageFactory();
GridCoverage2D outputCoverage = factory.create("test", slopeData, env);
GeoTiffWriter writer = new GeoTiffWriter(new File(outputPath));
writer.write(outputCoverage, null);
writer.dispose();
int ixtiles = sourceImage.getNumXTiles();
Raster raster = sourceImage.getTile(0,0);
int itilerasterwidth = raster.getWidth();
int itilerasterheight = raster.getHeight();
int irasternumbands = raster.getNumBands();
//获取坐标系
CoordinateReferenceSystem crs = coverage.getCoordinateReferenceSystem2D();
//获取图斑名称
String [] names = tifReader.getGridCoverageNames();
//获取影像长宽
int iwidth = coverage.getRenderedImage().getWidth();
int iheight = coverage.getRenderedImage().getHeight();
//获取仿射因子其他参数
int a = coverage.getGridGeometry().gridDimensionX;
int b = coverage.getGridGeometry().gridDimensionY;
int c = coverage.getGridGeometry().axisDimensionX;
int d = coverage.getGridGeometry().axisDimensionY;
//获取栅格图斑个数
int ibandcount = coverage.getNumSampleDimensions();
String[] sampleDimensionNames = new String[ibandcount];
for (int i = 0; i < ibandcount; i++) {
GridSampleDimension dim = coverage.getSampleDimension(i);
sampleDimensionNames[i] = dim.getDescription().toString();
}
//获取行列对应的像元值
Raster sourceRaster = sourceImage.getData();
float[] adsaf = {0};
sourceRaster.getPixel(1500, 800,adsaf);
float ibandvalue = sourceRaster.getSampleFloat(0,0,0);
//获取源数据类型
int iDataType = coverage.getRenderedImage().getSampleModel().getDataType();
//??栅格转矢量
// PolygonExtractionProcess process = new PolygonExtractionProcess();
// SimpleFeatureCollection features = process.execute(tiffCoverage, 0, Boolean.TRUE, null, null, null, null);
List list = new ArrayList();
for(int i=0;i<strPoints.size();i++) {
String strLonlat = strPoints.get(i);
String[] strLonlats = strLonlat.split(" ");
double lon = Double.parseDouble(strLonlats[0]),
lat = Double.parseDouble(strLonlats[1]);
//构建地理坐标
DirectPosition position = new DirectPosition2D(crs, lon, lat);
float[] results = (float[]) coverage.evaluate(position);
//通过地理坐标获取行列号
Point2D point2d = coverage.getGridGeometry().worldToGrid(position);
//通过行列号获取地理坐标
GridCoordinates2D coord= new GridCoordinates2D(0,0);
DirectPosition tmpPos = coverage.getGridGeometry().gridToWorld(coord);
float[] sss = (float[])coverage.evaluate(tmpPos);
Map map = new HashMap();
map.put("lon", lon);
map.put("lat", lon);
map.put("dem", results[0]);
list.add(JSONObject.toJSONString(map));
}
