Geostationary (black), semi-synchronous (grey) and low earth (red) orbits compared.
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August 29, 2015 13:57
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LEO vs geostationary
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>LEO and geostationary. husk.org.</title> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 900, | |
| height = 900; | |
| var projection = d3.geo.orthographic() | |
| .scale(64) // 6400km radius -> 64 pixels | |
| .translate([width / 2, height / 2]) | |
| .rotate([0, 270, 0]) | |
| .clipAngle(90); | |
| var canvas = d3.select("body").append("canvas") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var c = canvas.node().getContext('2d'); | |
| var path = d3.geo.path() | |
| .projection(projection) | |
| .context(c); | |
| d3.json("/d/5879060/world-110m.json", function(error, world) { | |
| var land = topojson.feature(world, world.objects.land), | |
| globe = {type: "Sphere"}; | |
| c.clearRect(0, 0, width, height); | |
| c.fillStyle = 'rgba(255,255,255,1)', | |
| c.beginPath(), | |
| path(globe), | |
| c.fill(), | |
| c.stroke(); | |
| c.fillStyle = 'rgba(204,204,204,.75)', | |
| c.beginPath(), | |
| path(land), | |
| c.fill(); | |
| // LEO | |
| c.beginPath(); | |
| c.arc(width/2, height/2, 65, 0, Math.PI*2, false); // 65 -> 6500km orbit radius -> 1000km orbit (actually kind of high) | |
| c.strokeStyle = 'red'; | |
| c.stroke(); | |
| // GPS (semi-synchronous) | |
| c.beginPath(); | |
| c.arc(width/2, height/2, 266, 0, Math.PI*2, false); // 422 -> 42,200 km axis, 35k altitude | |
| c.strokeStyle = '#999'; | |
| c.stroke(); | |
| // geosynchronous | |
| c.beginPath(); | |
| c.arc(width/2, height/2, 422, 0, Math.PI*2, false); // 422 -> 42,200 km axis, 35k altitude | |
| c.strokeStyle = 'black'; | |
| c.stroke(); | |
| }); | |
| </script> |
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