private void InitLocalFields()
{
double val = 0;
int hasVal = 0;
_dataType = GDALHelper.GDALDataType2DataType(_band.DataType);
_band.GetScale(out val, out hasVal);
if (hasVal != 0)
{
_dataScale = val;
}
_band.GetOffset(out val, out hasVal);
if (hasVal != 0)
{
_dataOffset = val;
}
GDALHelper.GetBandAttributes(_band, _attributes);
_description = _band.GetDescription();
//_measureBits = ?
_width = _band.XSize;
_height = _band.YSize;
_band.GetNoDataValue(out val, out hasVal);
if (hasVal != 0)
{
_noDataValue = val;
}
_spatialRef = _rasterDataProvider.SpatialRef;
_coordTransofrm = _rasterDataProvider.CoordTransform;
}
public GDALRasterDataProvider(string fileName, byte[] header1024, IGeoDataDriver driver, enumDataProviderAccess access)
: base(fileName, driver)
{
_driver = driver;
CallGDALBefore();
Access gdalAccess = access == enumDataProviderAccess.ReadOnly ? Access.GA_ReadOnly : Access.GA_Update;
_dataset = Gdal.Open(fileName, gdalAccess);
GDALHelper.GetDatasetAttributes(_dataset, _attributes);
if (header1024 == null)
{
header1024 = GetHeader1024Bytes(fileName);
}
TryGetBandProviderAndGetDefaultBands(gdalAccess, header1024, _attributes.GetAttributeDomain(GDAL_SUBDATASETS_NAME));
_width = 0; //GDAL: _dataset.RasterXSize 默认为512
_height = 0; //GDAL: _dataset.RasterYSize 默认为512
_filelist = _dataset.GetFileList();
_fileName = _fileName;
//读取波段列表
_bandCount = _dataset.RasterCount;
for (int i = 1; i <= _bandCount; i++)
{
_rasterBands.Add(new GDALRasterBand(this, _dataset.GetRasterBand(i), new GDALDataset(_dataset)));
}
_bandCount = _rasterBands.Count;
for (int i = 1; i <= _bandCount; i++)
{
_rasterBands[i - 1].BandNo = i;
}
TryGetDatTypeOfProvider();
TryGetSizeOfProvider();
TryCreateSpatialRef();
TryCreateCoordTransform();
TrySetEnvelopeAndResolutions();
//
//TryGetDataIdentity();
}
protected override void DirectWrite(int xOffset, int yOffset, int xSize, int ySize, IntPtr buffer, enumDataType dataType, int xBufferSize, int yBufferSize)
{
_band.WriteRaster(xOffset, yOffset, xSize, ySize, buffer, xBufferSize, yBufferSize, GDALHelper.DataType2GDALDataType(dataType), 0, 0);
}