D3.js geoAiry() Function

Last Updated : 18 Sep, 2020

The geoAiry() function in d3.js is used to draw the Airy’s minimum-error azimuthal projection from the given geojson data. This is a solution to the shape and area errors caused due to the minimization in a map projection.

Syntax:

d3.geoAiry()

Parameters: This method does not accept any parameters.

Return Value: This method returns the Airy’s minimum-error azimuthal projection.

Example 1: The following example draws the Airy’s minimum-error azimuthal projection of Asia.

HTML

<!DOCTYPE html>
<html>

<head>
    <script src="https://d3js.org/d3.v4.min.js">
    </script>
    <script src=
"https://d3js.org/d3-geo-projection.v2.min.js">
    </script>
</head>

<body>
    <div style="width:1200px; height:1000px;">
        <center>
            <h3 style="color:green">
                geoAiry Projection of Asia
            </h3>
        </center>
        <svg width="800" height="500">
        </svg>
    </div>
    <svg width="400" height="300"></svg>
    <script>
        var svg = d3.select("svg"),
            width = +svg.attr("width"),
            height = +svg.attr("height");

        // geoAiry projection
        var gfg = d3.geoAiry()
            .scale(width / 1.5 / Math.PI)
            .translate([width / 2, height / 2]);

        // Loading the json data
        d3.json("https://raw.githubusercontent.com/" +
            "janasayantan/datageojson/master/" +
            "geoasia.json",
            function (data) {

                // Draw the map
                svg.append("g")
                    .selectAll("path")
                    .data(data.features)
                    .enter().append("path")
                    .attr("fill", "black")
                    .attr("d", d3.geoPath()
                        .projection(gfg)
                    )
                    .style("stroke", "#ffff")
            });
    </script>
</body>

</html>

Output:

Example 2: The following example draws the Airy’s minimum-error azimuthal projection of the world.

HTML

<!DOCTYPE html>
<html>

<head>
    <script src="https://d3js.org/d3.v4.js">
    </script>
    <script src=
"https://d3js.org/d3-geo-projection.v2.min.js">
    </script>
</head>

<body>
    <div style="width:700px; height:600px;">
        <center>
            <h3 style="color:grey">
                azimuthal Projection of World
            </h3>
        </center>
        <svg width="700" height="550">
        </svg>
    </div>
    <script>
        var svg = d3.select("svg"),
            width = +svg.attr("width"),
            height = +svg.attr("height");

        // geoAiry projection
        var gfg = d3.geoAiry()
            .scale(width / 1.5 / Math.PI)
            .translate([width / 2, height / 2]);

        // Loading the json data
        d3.json("https://raw.githubusercontent.com/" +
            "janasayantan/datageojson/master/" +
            "geoworld%20.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:

D3.js geoAitoff() Function

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D3.js geoAiry() Function

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