A la proyección mercator es necesario ajustarle 2°por la deformación existente el la parte sur de la Argentina.
Last active
December 23, 2015 02:48
-
-
Save jkutianski/6568909 to your computer and use it in GitHub Desktop.
Comparación entre proyección mercator y mercator transversa para la Argentina
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<!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> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment