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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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43
MapControl/WinUI/GeoImage.WinUI.cs
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@ -3,8 +3,6 @@
// Licensed under the Microsoft Public License (Ms-PL)
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using Windows.Graphics.Imaging;
using Windows.Storage;
@ -18,7 +16,7 @@ namespace MapControl
{
public partial class GeoImage
{
public static async Task<Tuple<BitmapSource, Matrix>> ReadGeoTiff(string sourcePath)
private static async Task<GeoBitmap> ReadGeoTiff(string sourcePath)
{
var file = await StorageFile.GetFileFromPathAsync(FilePath.GetFullPath(sourcePath));
@ -26,6 +24,7 @@ namespace MapControl
{
WriteableBitmap bitmap;
Matrix transform;
MapProjection projection = null;
var decoder = await BitmapDecoder.CreateAsync(stream);
@ -35,31 +34,45 @@ namespace MapControl
swbmp.CopyToBuffer(bitmap.PixelBuffer);
}
var query = new List<string>
{
PixelScaleQuery, TiePointQuery, TransformQuery, NoDataQuery
};
var geoKeyDirectoryQuery = QueryString(GeoKeyDirectoryTag);
var pixelScaleQuery = QueryString(ModelPixelScaleTag);
var tiePointQuery = QueryString(ModelTiePointTag);
var transformationQuery = QueryString(ModelTransformationTag);
var metadata = await decoder.BitmapProperties.GetPropertiesAsync(
new string[]
{
pixelScaleQuery,
tiePointQuery,
transformationQuery,
geoKeyDirectoryQuery
});
var metadata = await decoder.BitmapProperties.GetPropertiesAsync(query);
if (metadata.TryGetValue(PixelScaleQuery, out BitmapTypedValue pixelScaleValue) &&
if (metadata.TryGetValue(pixelScaleQuery, out BitmapTypedValue pixelScaleValue) &&
pixelScaleValue.Value is double[] pixelScale && pixelScale.Length == 3 &&
metadata.TryGetValue(TiePointQuery, out BitmapTypedValue tiePointValue) &&
metadata.TryGetValue(tiePointQuery, out BitmapTypedValue tiePointValue) &&
tiePointValue.Value is double[] tiePoint && tiePoint.Length >= 6)
{
transform = new Matrix(pixelScale[0], 0d, 0d, -pixelScale[1], tiePoint[3], tiePoint[4]);
}
else if (metadata.TryGetValue(TransformQuery, out BitmapTypedValue tformValue) &&
tformValue.Value is double[] tform && tform.Length == 16)
else if (metadata.TryGetValue(transformationQuery, out BitmapTypedValue transformValue) &&
transformValue.Value is double[] transformValues && transformValues.Length == 16)
{
transform = new Matrix(tform[0], tform[1], tform[4], tform[5], tform[3], tform[7]);
transform = new Matrix(transformValues[0], transformValues[1],
transformValues[4], transformValues[5],
transformValues[3], transformValues[7]);
}
else
{
throw new ArgumentException($"No coordinate transformation found in {sourcePath}.");
}
return new Tuple<BitmapSource, Matrix>(bitmap, transform);
if (metadata.TryGetValue(geoKeyDirectoryQuery, out BitmapTypedValue geoKeyDirValue) &&
geoKeyDirValue.Value is short[] geoKeyDirectory)
{
projection = GetProjection(sourcePath, geoKeyDirectory);
}
return new GeoBitmap(bitmap, transform, projection);
}
}
}