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This free utility will generate a PNG or SVG file representing a properly formatted declination diagram for a specific map. Background. In cartography, a declination diagram is used to provide a graphic representation of the variations between true north, grid north, and magnetic north on a map.
MapTools - Design a custom declination reference sheet for your location, your map, and the way you use your compass.
This demo uses geodesy, for UTM convergence, and geomagJS, for magnetic variation using World Magnetic Model, to calculate the angles, and then the Grid Declination Diagram is drawn as a SVG using custom javascript code.
Click on the map to find the magnetic declination at your location
14 sty 2021 · St. Paul, Minnesota, January 14, 2021 – SharedGeo is pleased to announce it has created an open source solution to a longstanding cartographic problem by creating a free web service to generate a magnetic declination diagram.
Drag the marker and get values of Grid Convergence and Magnetic Declination for that location. Grid Convergence is defined as the difference between Grid North and True North for UTM projection (East Convergence is positive).
28 wrz 2021 · SharedGeo has created an open source solution to a longstanding cartographic problem by creating a free web service to generate a magnetic declination diagram. In cartography, a declination diagram is used to provide a graphic representation of the variations between true north, grid north, and magnetic north on a map.
