A d3 line plot that takes data from the UK Environment Agency river level API. The last 4 weeks from a particular measurement station are shown.
Uses Environment Agency flood and river level data from the real-time data API (Beta).
Last active
October 21, 2017 12:33
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d3 line plot from real time UK Environment Agency river level API
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| license: mit |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <style> | |
| .line { | |
| fill: none; | |
| stroke: steelblue; | |
| stroke-width: 2px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var margin = {top: 20, right: 20, bottom: 30, left: 50}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var x = d3.scaleTime().range([0, width]); | |
| var y = d3.scaleLinear().range([height, 0]); | |
| var line = d3.line() | |
| .x(function(d) { return x(d3.isoParse(d.dateTime)); }) | |
| .y(function(d) { return y(d.value); }); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", | |
| "translate(" + margin.left + "," + margin.top + ")"); | |
| // Fetch data from the UK Environment Agency River Level Real Time API | |
| // Data is from Station "F1902" | |
| // Fetch readings from last 4 weeks | |
| d3.json("https://environment.data.gov.uk/flood-monitoring/id/measures/F1902-level-stage-i-15_min-m/readings?_sorted", function(error, rawData) { | |
| if (error) throw error; | |
| var data=rawData.items; | |
| // Scale the range of the data | |
| x.domain(d3.extent( data, function(d) { return d3.isoParse(d.dateTime); })); | |
| y.domain([0, d3.max( data, function(d) {return d.value;})]); | |
| // Add the line showing the river level | |
| svg.append("path") | |
| .data([data]) | |
| .attr("class", "line") | |
| .attr("d", line); | |
| // Add the X Axis | |
| svg.append("g") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(d3.axisBottom(x)); | |
| // Add the Y Axis | |
| svg.append("g") | |
| .call(d3.axisLeft(y)) | |
| .append("text") | |
| .attr("fill", "#000") | |
| .attr("transform", "rotate(-90)") | |
| .attr("y", 6) | |
| .attr("dy", "0.71em") | |
| .attr("text-anchor", "end") | |
| .text("River level (m)"); | |
| }); | |
| </script> | |
| </body> |
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