Pmad.Cartography

Pmad.Cartography

A simple and read-to-use Digital Elevation Model for everyone based on Open Data with minimalist credits

Digital Elevation Model sources

Source	Resolution	License	URL	Credits
SRTM1	1 arc second	Public Domain	https://cdn.dem.pmad.net/SRTM1/	NASA
SRTM15+	15 arc second	Public Domain	https://cdn.dem.pmad.net/SRTM15Plus/	Tozer, B. , D. T. Sandwell, W. H. F. Smith, C. Olson, J. R. Beale, and P. Wessel
AW3D30	1 arc second	See terms	https://cdn.dem.pmad.net/AW3D30/	� JAXA

var database = WellKnownDatabases.GetSRTM1();

// Singe point
var elevation = await database.GetElevationAsync(new Coordinates(51.509865, -0.118092), DefaultInterpolation.Instance);

// Area
var area = await demDatabase.CreateView<float>(new Coordinates(51, -1), new Coordinates(52, 0));

Elevation contours

var contour = new ContourGraph();
contour.Add(area, new ContourLevelGenerator(10, 10)); // 10 meters elevation interval from 10

Hillshading

var img = new HillshaderFast(new Vector2D(10, 10)) // Assume each pixel of area is 10x10 meters
			.GetPixelsAlphaBelowFlat(area);

File formats

Supported data formats

Format	Read	Write	Remarks
ESRI ASCII	Yes	Yes	float only
DDC	Yes	Yes	Format specific to Pmad.Cartography
GeoTIFF	Yes	No	WSG84 projection Only
SRTM	Yes	No	3 and 1 arc second

Supported compression formats

Most DEM files requires a lot of disk space. To reduce the size of the files, the following compression formats are supported:

Format	Read	Write	Remarks
ZSTD	Yes	Yes	Best compromise storage/CPU cost
GZIP	Yes	Yes	Lowest CPU cost
Brotli	Yes	Yes	Best compression
Zip	Yes	No	Zip must contains only one file

Pmad.Cartography.Drawing

A simple topographic map rendering toolkit.

Drawing API is still in development, it may change in the future.