class 5 - states

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class 5 - states

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Last edited Mar 9, 2017

Created on Mar 9, 2017

This example displays a map of United States state boundaries rendered in SVG using d3.geoPath with the d3.geoAlbersUsa projection. It overlays earthquake locations from the USGS live GeoJSON feed, with earthquakes plotted as crimson paths on the map. The code uses topojson to convert state topology data and d3.json to load both the state boundaries and earthquake data. A legend is included, and the visualization also shows a coordinate readout that updates on mousemove events, revealing the current latitude and longitude under the cursor.

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class 5 - states

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A map of the United States displays earthquake locations from the USGS all-week feed, with each state rendered as a gray SVG path via `d3.geoPath` and a `d3.geoAlbersUsa` projection. Crimson circles mark earthquake epicenters, and a legend categorizes magnitudes by color, though the current legend implementation uses static orange swatches. The visualization uses TopoJSON for state boundaries and includes mouse-position coordinate tracking that updates an on-screen info panel.

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This example displays a map of the contiguous United States with earthquake locations overlaid as crimson points. The map is rendered using `d3.geoPath` with the `d3.geoAlbersUsa()` projection, while earthquake data is pulled from the USGS live GeoJSON feed. State boundaries come from a local US GeoJSON file processed with `topojson.feature`. The visualization also includes a static legend and interactive coordinate display, which updates as the mouse moves across the map. All drawing is performed with SVG elements.

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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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This D3 visualization displays a map of US states generated from a GeoJSON TopoJSON source, overlaid with earthquake locations from the USGS all-week feed. It shows the geographic distribution of recent seismic activity across the country, with each quake rendered as a crimson point. The map uses the `d3.geoAlbersUsa` projection and `d3.geoPath` for both state boundaries and earthquake points. As the mouse moves, the page displays the cursor’s geographic coordinates, computed via `projection.invert` and formatted with `d3.format`.

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This example displays a map of the United States with earthquake locations overlaid as crimson points. The map is rendered using SVG paths created with `d3.geoPath` and a `d3.geoAlbersUsa` projection, while earthquake data is loaded from the USGS GeoJSON feed and plotted with the same path generator. The visualization also shows the latitude and longitude of the mouse cursor in a separate text element, using the projection’s `invert` method to translate screen coordinates to geographic coordinates.

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A U.S. map displays all 50 states in gray with a blue background, overlaid with red circles marking earthquake locations from the USGS live feed. The visualization plots both state boundaries and seismic events using d3.geoPath with the d3.geoAlbersUsa projection, filtering earthquake data by magnitude into four color-coded legend categories. The code loads TopoJSON state data and GeoJSON earthquake data via d3.json, with a legend showing magnitude ranges from 1.0 to 4.0+.

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