The geoAzimuthalEqualArea() function in d3.js is used to draw the Lambert azimuthal equal-area projection from the given geojson data. It is a projection that tries to maintain land features to their correct relative sizes while also maintaining the correct sense of direction from the center. The world here is projected onto a flat surface from any point on the globe.
Syntax:
d3.geoAzimuthalEqualArea()
Parameters: This method does not accept any parameters.
Return Value: This method returns the azimuthal equal-area projection.
Example 1: The following example draws the Lambert azimuthal equal-area projection of North and South America.
HTML
<!DOCTYPE html> <html> <head> </script> <script src= </script> </head> <body> <div style="width:300px; height:700px;"> <center> <h4 style="color:green"> AzimuthalEqualArea Projection of America </h4> </center> <svg width="400" height="300"> </svg> </div> <script> var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); // AzimuthalEqualArea projection var gfg = d3.geoAzimuthalEqualArea() .scale(width / 1.5 / Math.PI) .translate([width / 2, height / 2]); // Loading the json data d3.json("https://raw.githubusercontent.com/" + "janasayantan/datageojson/master/" + "america.json", function (data) { // Draw the map svg.append("g") .selectAll("path") .data(data.features) .enter().append("path") .attr("fill", "green") .attr("d", d3.geoPath() .projection(gfg) ) .style("stroke", "#ffff") }); </script> </body> </html> |
Output:
Example 2: The following example draws the Lambert azimuthal equal-area projection of Africa.
HTML
<!DOCTYPE html> <html> <head> </script> <script src= </script> </head> <body> <div style="width:600px; height:300px;"> <center> <h4 style="color:green"> AzimuthalEqualArea Projection of Africa </h4> </center> <svg width="600" height="300"> </svg> </div> <script> var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); // AzimuthalEqualArea var gfg = d3.geoAzimuthalEqualArea() .scale(width / 1.5 / Math.PI) .translate([width / 2, height / 2]); // Loading the json data d3.json("https://raw.githubusercontent.com/" + "janasayantan/datageojson/master/" + "geoAfrica.json", function (data) { // Draw the map svg.append("g") .selectAll("path") .data(data.features) .enter().append("path") .attr("fill", "olive") .attr("d", d3.geoPath() .projection(gfg) ) .style("stroke", "#ffff") }); </script> </body> </html> |
Output:
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