/// <summary>
/// Converter as coordenadas de WGS 84 / UTM zone 23S para latitude e longitude em graus
/// </summary>
/// <param name="lonLat">Array de vetor com as duas coordenadas Geodesicas</param>
/// <param name="tifProjectionReference"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <returns></returns>
public static double[] LonLatToTifCoordinates(double[][] lonLat, string tifProjectionReference, int imgWidth, int imgHeight)
{
// referência do arquivo tif em WGS 84 / UTM zone 23S
SpatialReference newReference = new SpatialReference(tifProjectionReference);
// referência em latitude e longitude
SpatialReference currentReference = GdalUtilities.getWgs84Reference();
CoordinateTransformation ct = new CoordinateTransformation(currentReference, newReference);
double[] tifGeoTransformerData = new double[6];
double[] northwest = new double[2] {
lonLat[0][0], lonLat[0][1]
};
double[] southeast = new double[2] {
lonLat[1][0], lonLat[1][1]
};
ct.TransformPoint(northwest);
ct.TransformPoint(southeast);
southeast = new double[2] {
(southeast[0] - northwest[0]) / imgWidth,
(southeast[1] - northwest[1]) / imgHeight
};
tifGeoTransformerData[0] = northwest[0];
tifGeoTransformerData[1] = southeast[0];
tifGeoTransformerData[2] = 0;
tifGeoTransformerData[3] = northwest[1];
tifGeoTransformerData[4] = 0;
tifGeoTransformerData[5] = southeast[1];
return(tifGeoTransformerData);
}
public void AplyWhiteBalance(string imagePath, string outImagePath)
{
using (Dataset image = Gdal.Open(imagePath, Access.GA_ReadOnly)) {
Band redBand = GdalUtilities.GetBand(image, ColorInterp.GCI_RedBand);
Band greenBand = GdalUtilities.GetBand(image, ColorInterp.GCI_GreenBand);
Band blueBand = GdalUtilities.GetBand(image, ColorInterp.GCI_BlueBand);
if (redBand == null || greenBand == null || blueBand == null)
{
throw new NullReferenceException("One or more bands are not available.");
}
int width = redBand.XSize;
int height = redBand.YSize;
using (Dataset outImage = Gdal.GetDriverByName("GTiff").Create(outImagePath, width, height, 3, DataType.GDT_Byte, null)) {
GdalUtilities.CopyGeoProjection(image, outImage);
Band outRedBand = outImage.GetRasterBand(1);
Band outGreenBand = outImage.GetRasterBand(2);
Band outBlueBand = outImage.GetRasterBand(3);
GdalUtilities.SetBandsColorInterpretation(outRedBand, outGreenBand, outBlueBand);
int[] red = new int[width * height];
int[] green = new int[width * height];
int[] blue = new int[width * height];
redBand.ReadRaster(0, 0, width, height, red, width, height, 0, 0);
greenBand.ReadRaster(0, 0, width, height, green, width, height, 0, 0);
blueBand.ReadRaster(0, 0, width, height, blue, width, height, 0, 0);
byte[] outRed = WhiteBalanceBand(red);
byte[] outGreen = WhiteBalanceBand(green);
byte[] outBlue = WhiteBalanceBand(blue);
outRedBand.WriteRaster(0, 0, width, height, outRed, width, height, 0, 0);
outGreenBand.WriteRaster(0, 0, width, height, outGreen, width, height, 0, 0);
outBlueBand.WriteRaster(0, 0, width, height, outBlue, width, height, 0, 0);
outImage.FlushCache();
}
}
}