A la proyección mercator es necesario ajustarle 2°por la deformación existente el la parte sur de la Argentina.
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December 23, 2015 02:48
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Comparación entre proyección mercator y mercator transversa para la Argentina
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .graticule { | |
| fill: none; | |
| stroke: black; | |
| stroke-opacity: .5; | |
| stroke-width: .5px; | |
| } | |
| .land { | |
| fill: gray; | |
| stroke: white; | |
| stroke-width: .5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/d3.geo.projection.v0.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960/2, | |
| height = 500; | |
| var svg, | |
| projection, | |
| path, | |
| graticule; | |
| d3.json("argentina_indec.json", function(error, json) { | |
| // Transverse Mercator | |
| svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| projection = d3.geo.transverseMercator() | |
| .center([2.5, -38.5]) | |
| .rotate([66, 0]) | |
| .scale((height * 56.5) / 33) | |
| .translate([(width / 2), (height / 2)]); | |
| path = d3.geo.path() | |
| .projection(projection); | |
| graticule = d3.geo.graticule() | |
| .extent([[-180,-90], [0,0]]) | |
| .step([3, 3]); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| svg.selectAll("text") | |
| .data(topojson.feature(json, json.objects.provincias).features) | |
| .enter() | |
| .append("path") | |
| .attr("d", path) | |
| .attr("class", "land"); | |
| svg.append("text") | |
| .text("Transverse Mercator") | |
| .attr("x", 10) | |
| .attr("y", 25) | |
| .attr("fill", "blue") | |
| .attr("style","font-family: Arial, Helvetica, sans-serif; font-weight: bold; font-style: normal"); | |
| // Mercator | |
| svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| projection = d3.geo.mercator() | |
| // debe ajustarse 2° (-40.5 en lugar de -38.5) ya que el centro geografico | |
| // esta desfasado por la deformacion del territorio cercano a los polos. | |
| .center([2.5, -40.5]) | |
| .rotate([66, 0]) | |
| // tambien debe ajustarse la escala ya que la proyeccion mercator es mas larga | |
| .scale((height * 43) / 33) | |
| .translate([(width / 2), (height / 2)]); | |
| path = d3.geo.path() | |
| .projection(projection); | |
| graticule = d3.geo.graticule() | |
| .extent([[-180,-90], [0,0]]) | |
| .step([3, 3]); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| svg.selectAll("text") | |
| .data(topojson.feature(json, json.objects.provincias).features) | |
| .enter() | |
| .append("path") | |
| .attr("d", path) | |
| .attr("class", "land"); | |
| svg.append("text") | |
| .text("Mercator") | |
| .attr("x", 10) | |
| .attr("y", 25) | |
| .attr("fill", "blue") | |
| .attr("style","font-family: Arial, Helvetica, sans-serif; font-weight: bold; font-style: normal"); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> | |
| </body> | |
| </html> |
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