Working with d3.js projections for mapping geospatial data
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forked from enjalot's block: WWSD #6: d3.js projections
forked from KristinHenry's block: WWSD #6: d3.js projections
forked from KristinHenry's block: WWSD #6: d3.js projections
forked from KristinHenry's block: WWSD #6: d3.js projections
| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| svg { width:100%; height: 100% } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var width = 960; | |
| var height = 500; | |
| var svg = d3.select("body").append("svg") | |
| var projection = d3.geo.mercator() | |
| .scale(width / 2 / Math.PI) | |
| //.scale(100) | |
| .translate([width / 2, height / 2]) | |
| // var projection = d3.geo.azimuthalEquidistant() | |
| // .scale(50) | |
| // .translate([width / 2, height / 2]) | |
| // .clipAngle(180 - 1e-3) | |
| // .rotate([0, 25]) | |
| // .precision(.1); | |
| function cylindrical(width, height) { | |
| return d3.geo.projection(function(λ, φ) { return [λ, φ * 2 / width * height]; }) | |
| .scale(width / 2 / Math.PI) | |
| .translate([width / 2, height / 2]); | |
| } | |
| var projection = cylindrical(width, height) | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var url = "http://enjalot.github.io/wwsd/data/world/world-110m.geojson"; | |
| d3.json(url, function(err, geojson) { | |
| svg.append("path") | |
| .attr("d", path(geojson)) | |
| }) | |
| var point = projection([0,52]) | |
| svg.append('circle') | |
| .attr({ | |
| cx: point[0], | |
| cy: point[1], | |
| r: 5, | |
| fill: 'red' | |
| }) | |
| //37.7749° N, 122.4194° W | |
| var point2 = projection([-122.4194,37.7749]) | |
| svg.append('circle') | |
| .attr({ | |
| cx: point2[0], | |
| cy: point2[1], | |
| r: 15, | |
| fill: 'red' | |
| }) | |
| </script> | |
| </body> |