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class 3 - states

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MMTClass
Last edited Feb 25, 2017
Created on Feb 25, 2017

This visualization shows a map of the United States with earthquake locations overlaid, using a dark gray state outline on a blue background. It loads US state boundaries from a remote TopoJSON file and renders them with `d3.geoPath` using the `d3.geoAlbersUsa` projection. Earthquake data is fetched from the USGS GeoJSON feed and plotted as crimson circles. A mouse-move handler displays the current latitude and longitude in a separate text layer.

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class 3 - states

This visualization shows a map of the United States with earthquake locations overlaid, using a dark gray state outline on a blue background. It loads US state boundaries from a remote TopoJSON file and renders them with `d3.geoPath` using the `d3.geoAlbersUsa` projection. Earthquake data is fetched from the USGS GeoJSON feed and plotted as crimson circles. A mouse-move handler displays the current latitude and longitude in a separate text layer.

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This example displays a map of US states rendered in gray with an Albers USA projection, overlaid with crimson points marking earthquake locations from the USGS live GeoJSON feed. It uses d3.geoPath for both state boundaries and earthquake points, with topojson to convert US state geometries. As the mouse moves over the map, a text display updates to show the geographic longitude and latitude in degrees, computed via projection.invert and d3.mouse. The visualization layers states and earthquakes in separate SVG groups, with a fixed SVG canvas sized 960 by 500 pixels.

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