Geotools Image Tif 打开影像文件，写入数据，并且保存

public static GeoTiffReader getImageReader(String iamge){
  Hints tiffHints = new Hints();
  tiffHints.add(new Hints(Hints.FORCE_LONGITUDE_FIRST_AXIS_ORDER, Boolean.TRUE));
  tiffHints.add(new Hints(Hints.DEFAULT_COORDINATE_REFERENCE_SYSTEM, DefaultGeographicCRS.WGS84));

  try{
    File file = new File(iamge);
    GeoTiffReader tmpTif = new GeoTiffReader(file,tiffHints);
    return tmpTif;
  }catch (Exception e){
    e.printStackTrace();
    return  null;
  }
}  

//noData获取
double nodata = reader.read(null).getSampleDimension(0).getNoDataValues()[0];

//scalex,scaley 像元获取
AffineTransform trs = (AffineTransform)reader.read(null).getGridGeometry().getGridToCRS();
metaInfo.setScaleX(trs.getScaleX());
metaInfo.setScaleY(trs.getScaleY());

float[] tmpDatas = new float[widthX*heightY];
metaInfo.getSplitGrid().getPixels(metaInfo.getSplitIdxX(),metaInfo.getSplitIdxY(),widthX,heightY,tmpDatas);

for(int row=0; row <heightY; row++){
  for(int col= 0; col<widthX; col++){
    if(tmpDatas[row*widthX+col] != metaInfo.getNoData()){
      newGrid[row+startY][col+startX] = tmpDatas[row*widthX+col];
    }
  }
}

GridSampleDimension[] dimensions = metaImages.get(0).getReader().read(null).getSampleDimensions();
Envelope2D mergedEnvelope = new Envelope2D(metaImages.get(0).getReader().getCoordinateReferenceSystem(),minX,minY,maxX - minX,maxY - minY);
GridCoverage2D outputCoverage = ImageUtils.customCreate("merge",newGrid,mergedEnvelope,dimensions);

GeoTiffWriter writer = new GeoTiffWriter(new File(dstFile));
writer.write(outputCoverage, null);
writer.dispose();