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Orthographic Clipping

✓ Published0🌍 Public
BBBischof
Last edited Jun 26, 2016
Created on Jun 26, 2016

An orthographic projection of Earth’s graticule rotates slowly, with a circle marking the visible hemisphere’s boundary. The graticule lines, drawn at 10º latitude and longitude intervals, are clipped at the projection’s 90° limit, while a world map outline from a GeoJSON file is also clipped in the same way. Both the graticule and the map path animate via a timer, using `d3.geo.orthographic()`, `d3.geo.path()`, and `d3.timer` within d3.v3’s SVG rendering.

AI-generated description

The above grid demonstrates an orthographic azimuthal projection. The lines are at uniform 10º increments of latitude and longitude.

Part 2 of 3.

  1. Orthographic Grid
  2. Orthographic Clipping
  3. Orthographic Shading

To see this technique applied to real geographic features, see the Spinny Globe example.

forked from <a href='http://bl.ocks.org/mbostock/'>mbostock</a>'s block: <a href='http://bl.ocks.org/mbostock/3021474'>Orthographic Clipping</a>

gpl-3.0 Licensed

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