Maptor

IRI.Maptor.Infrastructure.GdiPlus

NuGet Target

Bridges GDI+/System.Drawing with the Maptor spatial stack — georeferenced raster data sources (worldfile-based), EXIF geotag reading/writing, and digital image processing utilities used by the Maptor desktop applications.

Installation

dotnet add package IRI.Maptor.Infrastructure.GdiPlus

Requires Windows (uses System.Drawing / GDI+).

Features

  • GeoRasterFileDataSource — raster data source for worldfile-georeferenced images
  • ClusteredGeoTaggedImageSource — data source for clustered sets of geo-tagged images
  • WorldfileManager / WorldfilePyramid — read/write ESRI worldfiles and build worldfile-based tile pyramids
  • ImageHelper — EXIF geotag read/write (GetLatitude, GetLongitude, GetAltitude, SaveGeoTagInfo), bitmap-matrix conversion, image differencing and confusion-matrix comparison, bitmap overlay
  • DoubleBitmap — high-precision pixel access over GDI+ bitmaps
  • Pixel value types (ArgbValues, ByteArgbValues, RgbValues, ByteRgbValues) and Conversion helpers between images and numeric arrays
  • ImageMatrix — matrix representation of raster data for numerical processing
  • Spatial-domain enhancement: GaussianConvolution, RadiometricEnhancement, GeometricEnhancement
  • SIFT image matching (ScaleInvariantFeatureTransform, SiftImageMatching)
  • Remote sensing: principal component transformation

Usage

using IRI.Maptor.Infrastructure.GdiPlus.Helpers;
using IRI.Maptor.Infrastructure.GdiPlus.WorldfileFormat;

// load a worldfile-georeferenced image
var geoImage = await WorldfileManager.ReadWorldfileAsync(@"c:\data\map.png", srid: 4326);

// read the EXIF geotag of a photo
using var bitmap = new System.Drawing.Bitmap(@"c:\photos\p1.jpg");
double? latitude = ImageHelper.GetLatitude(bitmap);
double? longitude = ImageHelper.GetLongitude(bitmap);

Limitations

  • Windows only (System.Drawing.Common / GDI+).
  • Georeferencing is worldfile-based; embedded GeoTIFF tags are not read.

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