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Query GeoTIFF GeoKeyDirectoryTag in GeoImage

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ClemensFischer 2022-12-09 19:57:52 +01:00
parent 5645f8f0e8
commit 17745dc6fb
3 changed files with 103 additions and 42 deletions
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18
MapControl/WPF/GeoImage.WPF.cs
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@ -13,12 +13,13 @@ namespace MapControl
{
public partial class GeoImage
{
private static async Task<Tuple<BitmapSource, Matrix>> ReadGeoTiff(string sourcePath)
private static async Task<GeoBitmap> ReadGeoTiff(string sourcePath)
{
return await Task.Run(() =>
{
BitmapSource bitmap;
Matrix transform;
MapProjection projection = null;
using (var stream = File.OpenRead(sourcePath))
{
@ -27,12 +28,12 @@ namespace MapControl
var metadata = (BitmapMetadata)bitmap.Metadata;
if (metadata.GetQuery(PixelScaleQuery) is double[] pixelScale && pixelScale.Length == 3 &&
metadata.GetQuery(TiePointQuery) is double[] tiePoint && tiePoint.Length >= 6)
if (metadata.GetQuery(QueryString(ModelPixelScaleTag)) is double[] pixelScale && pixelScale.Length == 3 &&
metadata.GetQuery(QueryString(ModelTiePointTag)) is double[] tiePoint && tiePoint.Length >= 6)
{
transform = new Matrix(pixelScale[0], 0d, 0d, -pixelScale[1], tiePoint[3], tiePoint[4]);
}
else if (metadata.GetQuery(TransformQuery) is double[] tform && tform.Length == 16)
else if (metadata.GetQuery(QueryString(ModelTransformationTag)) is double[] tform && tform.Length == 16)
{
transform = new Matrix(tform[0], tform[1], tform[4], tform[5], tform[3], tform[7]);
}
@ -41,12 +42,17 @@ namespace MapControl
throw new ArgumentException($"No coordinate transformation found in {sourcePath}.");
}
if (metadata.GetQuery(NoDataQuery) is string noData && int.TryParse(noData, out int noDataValue))
if (metadata.GetQuery(QueryString(GeoKeyDirectoryTag)) is short[] geoKeyDirectory)
{
projection = GetProjection(sourcePath, geoKeyDirectory);
}
if (metadata.GetQuery(QueryString(NoDataTag)) is string noData && int.TryParse(noData, out int noDataValue))
{
bitmap = ConvertTransparentPixel(bitmap, noDataValue);
}
return new Tuple<BitmapSource, Matrix>(bitmap, transform);
return new GeoBitmap(bitmap, transform, projection);
});
}