Figure 37.—Tilted Perspective projection. Eastern seaboard viewed from a point about 160 km above Newburg, N.Y. Parameters using symbols in text: φ₁ = 41º 30′ N. lat, λ₀ = 74º 00′ W. long., ω = 55º, γ = 210º, P = 1.025. 1º graticule.
Satellite Projection Test
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
margin: auto; | |
padding: 10px; | |
width: 537px; | |
} | |
svg { | |
background: url(readme.png) no-repeat; | |
border: solid 1px #000; | |
} | |
.graticule { | |
fill: none; | |
stroke: red; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script src="//d3js.org/d3.geo.projection.v0.min.js"></script> | |
<script> | |
var width = 537, | |
height = 737; | |
var projection = d3.geo.satellite() | |
.distance(1.025) | |
.scale(38800) | |
.rotate([74, -41.5, 212]) | |
.tilt(55); | |
// The reference 74ºW, 41ºN is at 181px, 710px. | |
var offset = projection.translate([-181, -710])([-74, 41]); | |
projection.translate([-offset[0], -offset[1]]); | |
var graticule = d3.geo.graticule() | |
.extent([[-74 - 15, 41 - 15], [-74 + 1e-6, 41 + 1e-6]]) | |
.step([1, 1]); | |
var path = d3.geo.path() | |
.projection(projection); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
svg.append("path") | |
.datum(graticule) | |
.attr("class", "graticule") | |
.attr("d", path); | |
d3.select(self.frameElement).style("height", height + 20 + "px"); | |
</script> |
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