almccon/.block

## .block
license: mit

## README.md

      
    Raw
  

              README.md
            
          
    Using an orthographic projection to overlay the city of Bellingham, Washington with Vienna, Austria. The two maps are drawn with the "multiply" blend mode, so overlapping areas become blue.
All data © OpenStreetMap contributors

  
## bellingham.geojson

      
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              bellingham.geojson
            
          
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## bellingham_coast.geojson

      
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              bellingham_coast.geojson
            
          
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## comparisons.csv

          
            name
            lon
            lat

            
              vienna
              16.379241943359375
              48.211404849620486

## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  background: #fff;
  font-family: Helvetica, Arial, sans-serif;
  font-size: small;
}

</style>
<body>
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script src="//d3js.org/d3-queue.v3.min.js"></script>
<script>

var width = 960,
    height = 500;

var projection = d3.geoOrthographic()
    .scale(1e5)
    .translate([width / 2, height / 2])
    .clipAngle(90)
    .precision(.1);

var path = d3.geoPath()
    .projection(projection);

var primaryCoords = [-122.489,48.755];

d3.queue()
  .defer(d3.csv,"comparisons.csv")
  .defer(d3.json,"bellingham.geojson")
  .defer(d3.json,"bellingham_coast.geojson")
  .awaitAll(function(error, outerdata) {

  var comparisons = outerdata[0];
  var primary = outerdata[1];
  var primary_coast = outerdata[2];

  if (error) throw error;

  comparisons
    .filter(function(comp) { return ['vienna'].indexOf(comp.name) != -1;})
    //.filter(function(comp) { return ['venice_italy','thames','seine','danube','rhine','willamette','rotterdam'].indexOf(comp.name) != -1;})
    .forEach(function(comp) {

    var svg = d3.select("body").append("svg")
        .attr("width", width)
        .attr("height", height);

    //svg.append("text")
    //    .attr('x',20)
    //    .attr('y',20)
    //    .text(comp.name);

    var comparisonCoords = [comp.lon,comp.lat];

    d3.json(comp.name + ".geojson", function(error, comp_data) {
      if (error) throw error;
      d3.json(comp.name + "_coast.geojson", function(error, comp_coast) {
        if (error) throw error;

        //var comp_data = data[0];
        //var comp_coast = data[1];

        projection.rotate([-comparisonCoords[0],-comparisonCoords[1]]);

        // note, I need to load each feature individually to avoid linestrings
        var comp_g = svg.append("g")
            .style("mix-blend-mode", "multiply");

        comp_g
            .selectAll("path")
          .data(comp_data.features.filter(d => { return d.geometry.type != 'LineString';}))
          .enter()
            .append("path")
            .attr("d", path)
            .attr("stroke", 'none')
            .attr("fill", 'cyan')

        comp_g.append("path")
            .attr("d", path(comp_coast))
            .attr("stroke", 'none')
            .attr("fill", 'cyan')

        projection.rotate([-primaryCoords[0],-primaryCoords[1]]);

        var primary_g = svg.append("g")
            .style("mix-blend-mode", "multiply");

        primary_g
            .selectAll("path")
          .data(primary.features.filter(d => { return d.geometry.type != 'LineString';}))
          .enter()
            .append("path")
            .attr("d", path)
            .attr("stroke", 'none')
            .attr("fill", 'magenta')

        primary_g.append("path")
            .attr("d", path(primary_coast))
            .attr("stroke", 'none')
            .attr("fill", 'magenta')

      });
    });
  });
});

d3.select(self.frameElement).style("height", height + "px");

</script>

## thumbnail.png

      
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              thumbnail.png
            
          
## vienna.geojson

      
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              vienna.geojson
            
          
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## vienna_bak.geojson

      
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              vienna_bak.geojson
            
          
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## vienna_coast.geojson

      
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              vienna_coast.geojson
            
          
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	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	body {
	background: #fff;
	font-family: Helvetica, Arial, sans-serif;
	font-size: small;
	}

	</style>
	<body>
	<script src="//d3js.org/d3.v4.min.js"></script>
	<script src="//d3js.org/topojson.v1.min.js"></script>
	<script src="//d3js.org/d3-queue.v3.min.js"></script>
	<script>

	var width = 960,
	height = 500;

	var projection = d3.geoOrthographic()
	.scale(1e5)
	.translate([width / 2, height / 2])
	.clipAngle(90)
	.precision(.1);

	var path = d3.geoPath()
	.projection(projection);

	var primaryCoords = [-122.489,48.755];

	d3.queue()
	.defer(d3.csv,"comparisons.csv")
	.defer(d3.json,"bellingham.geojson")
	.defer(d3.json,"bellingham_coast.geojson")
	.awaitAll(function(error, outerdata) {

	var comparisons = outerdata[0];
	var primary = outerdata[1];
	var primary_coast = outerdata[2];

	if (error) throw error;

	comparisons
	.filter(function(comp) { return ['vienna'].indexOf(comp.name) != -1;})
	//.filter(function(comp) { return ['venice_italy','thames','seine','danube','rhine','willamette','rotterdam'].indexOf(comp.name) != -1;})
	.forEach(function(comp) {

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height);

	//svg.append("text")
	// .attr('x',20)
	// .attr('y',20)
	// .text(comp.name);

	var comparisonCoords = [comp.lon,comp.lat];

	d3.json(comp.name + ".geojson", function(error, comp_data) {
	if (error) throw error;
	d3.json(comp.name + "_coast.geojson", function(error, comp_coast) {
	if (error) throw error;

	//var comp_data = data[0];
	//var comp_coast = data[1];

	projection.rotate([-comparisonCoords[0],-comparisonCoords[1]]);

	// note, I need to load each feature individually to avoid linestrings
	var comp_g = svg.append("g")
	.style("mix-blend-mode", "multiply");

	comp_g
	.selectAll("path")
	.data(comp_data.features.filter(d => { return d.geometry.type != 'LineString';}))
	.enter()
	.append("path")
	.attr("d", path)
	.attr("stroke", 'none')
	.attr("fill", 'cyan')

	comp_g.append("path")
	.attr("d", path(comp_coast))
	.attr("stroke", 'none')
	.attr("fill", 'cyan')

	projection.rotate([-primaryCoords[0],-primaryCoords[1]]);

	var primary_g = svg.append("g")
	.style("mix-blend-mode", "multiply");

	primary_g
	.selectAll("path")
	.data(primary.features.filter(d => { return d.geometry.type != 'LineString';}))
	.enter()
	.append("path")
	.attr("d", path)
	.attr("stroke", 'none')
	.attr("fill", 'magenta')

	primary_g.append("path")
	.attr("d", path(primary_coast))
	.attr("stroke", 'none')
	.attr("fill", 'magenta')

	});
	});
	});
	});

	d3.select(self.frameElement).style("height", height + "px");

	</script>