///// <summary>
///// 根据栅格图层名字返回栅格图层数据数组
///// </summary>
///// <param name="layerName">图层名字</param>
///// <param name="width">ref类型,数据的宽度</param>
///// <param name="height">ref类型,数据的高度</param>
///// <returns>数据数组，按行优先</returns>
//private double[] GetData(string layerName, ref int width, ref int height)
//{
// var map = GIS.FrameWork.Application.App.Map;
// var layers = map.Layers;
// ILayer selectedLayer = null;
// for (int i = 0; i < layers.Count; i++)
// {
// var layer = layers[i];
// if (layer.LegendText == layerName)
// {
// selectedLayer = layer;
// break;
// }
// }
// if (selectedLayer == null)
// {
// return null; // 图层名无效
// }
// try
// {
// RasterLayer rasterLayer = selectedLayer as RasterLayer;
// IRaster rasterDataSet = rasterLayer.DataSet;
// Dataset dataset = GIS.GDAL.RasterConverter.Ds2GdalRaster(rasterDataSet, null, new int[] { 1 });
// width = dataset.RasterXSize;
// height = dataset.RasterYSize;
// double[] imageBuffer = new double[width * height];
// Band band = dataset.GetRasterBand(1);
// band.ReadRaster(0, 0, width, height, imageBuffer, width, height, 0, 0);
// return imageBuffer;
// }
// catch
// {
// return null; // 图层不是栅格图层或将图层转化为GDAL dataset失败或从GDAL dataset中读取数据失败
// }
//}
/// <summary>
/// 和GetData功能相同，但是使用GDAL直接从文件中读取数据。
/// 获取空间参照信息
/// </summary>
/// <param name="fileName">文件名字</param>
/// <param name="width">ref用于返回数据的宽度</param>
/// <param name="height">ref用于返回数据的高度</param>
/// <returns>一维数据数组,按行优先</returns>
protected double[] GdalGetData(string fileName, ref int width, ref int height)
{
OSGeo.GDAL.Dataset dataset = OSGeo.GDAL.Gdal.Open(fileName, OSGeo.GDAL.Access.GA_ReadOnly);
width = dataset.RasterXSize;
height = dataset.RasterYSize;
this.geoTransform = new double[6];
dataset.GetGeoTransform(geoTransform);
this.projStr = dataset.GetProjection();
this.tiffType = dataset.GetType();
double[] imageBuffer = new double[width * height];
OSGeo.GDAL.Band b = dataset.GetRasterBand(1);
b.ReadRaster(0, 0, width, height, imageBuffer, width, height, 0, 0);
double noDataVal;
int hasVal;
b.GetNoDataValue(out noDataVal, out hasVal);
this.noDataVal = noDataVal;
return(imageBuffer);
}
