ebola cases
This interactive map visualizes the geographic spread of Ebola cases across West Africa and beyond, plotting individual case locations as dots on a Leaflet-powered Mapbox base layer. The visualization uses a combined d3 and Leaflet setup to render points from a GeoJSON FeatureCollection, with each point representing a reported case location. The data is sourced from a gist by BrieLewis and was forked from earlier blocks by enjalot and scresawn. Users can pan and zoom across the map, with the points re-projecting smoothly thanks to d3’s SVG layer integrated with Leaflet's overlay pane. The map is centered on the Atlantic at [20,-30] with an initial zoom of 3, providing a global perspective on the geographic distribution of the cases. The visualization is built using d3 for data handling and Leaflet (via Mapbox) for map rendering, with all styling and interactivity embedded in a single HTML file. The dataset contains coordinates for locations in Spain, the United States, the Democratic Republic of the Congo, and Guinea, highlighting the spread of the disease across multiple countries. The animation capability (though not explicitly shown) would allow for temporal or sequential visualization of the cases. The project is licensed under MIT and was built with Blockbuilder.org, forked from existing blocks by enjalot and scresawn. The rendered output is an SVG map with animated dots representing cases.
This is more of a technical description. Write a description that highlights
the visual elements, their encodings, and what we can see in the visualization
(what the dots mean, how they got there, how they are plotted, why it might be
interesting, how it relates to the story). It should be 3 paragraphs. Add a
"Key visual elements" section, formatted as a list. Provide the output in valid
html.
Use this exact format:
<h1>ebola cases</h1>
<h2>Visualization Type</h2>
<p>...</p>
<h2>Data</h2>
<p>...</p>
<h2>Visual Encodings</h2>
<p>...</p>
<h2>Contextual Details</h2>
<p>...</p>
<h2>Key Visual Elements</h2>
<ul>
<li>...</li>
...
</ul>
<h2>Design and Interaction</h2>
<p>...</p>
<h2>Data Processing</h2>
<p>...</p>
<h2>References</h2>
<p>...</p>
</section>
Use the known metadata and files to fill in the sections with information about the described visualization.
Base the description on details of the code and data if available. If there is no information about a certain topic, mention that the information is not provided in the source. Make the total word count between 200 and 300 words. Use the provided title. Do not use "###" in your answer. Do not write YAML front matter or code fences.
Write a concise description of a data-visualization example for a visualization gallery.
Title: ebola cases
Known metadata:
source: gist
author: BrieLewis
rendering: svg, animation
license: mit
Files:
README.md This is a simple setup of Leaflet (via Mapbox) with d3 to show dots on a map. This can serve as a base for many interesting geographically based visualizations
Nice overview of using [d3 + Leaflet](http://chriszetter.com/blog/2014/06/15/building-a-voronoi-map-with-d3-and-leaflet/).
I found this slightly simpler to use than Mike's [classic post](http://bost.ocks.org/mike/leaflet/).
Built with [blockbuilder.org](http://blockbuilder.org)
forked from <a href='http://bl.ocks.org/enjalot/'>enjalot</a>'s block: <a href='http://bl.ocks.org/enjalot/18cb7a77b2d9de597b86'>ebola cases</a>
forked from <a href='http://bl.ocks.org/scresawn/'>scresawn</a>'s block: <a href='http://bl.ocks.org/scresawn/3e060dc8a99e52cd6198b0cfa157fcbb'>ebola cases</a>
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-10.566667,
8.283333
]
}
},
{
"type": "Feature",
"properties": {
"address": "Mobai",
"country": "Sierra Leone"
},
"geometry": {
"type": "Point",
"coordinates": [
-10.75,
7.983333
]
}
},
{
"type": "Feature",
"properties": {
"address": "Kailahun",
"country": "Sierra Leone"
},
"geometry": {
"type": "Point",
"coordinates": [
-10.566667,
8.283333
]
}
},
{
"type": "Feature",
"properties": {
"address": "Kissidougou",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-10.1,
9.183333
]
}
},
{
"type": "Feature",
"properties": {
"address": "Macenta",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-9.466667,
8.55
]
}
},
{
"type": "Feature",
"properties": {
"address": "Faranah",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-10.683333,
9.1
]
}
},
{
"type": "Feature",
"properties": {
"address": "Kissidougou",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-10.1,
9.183333
]
}
},
{
"type": "Feature",
"properties": {
"address": "Kankan",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-9.3,
10.383333
]
}
},
{
"type": "Feature",
"properties": {
"address": "Boffa",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-14.05,
10.6
]
}
},
{
"type": "Feature",
"properties": {
"address": "Siguiri",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-9.166667,
11.65
]
}
},
{
"type": "Feature",
"properties": {
"address": "Kissidougou",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-10.1,
9.183333
]
}
},
{
"type": "Feature",
"properties": {
"address": "Macenta",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-9.466667,
8.55
]
}
},
{
"type": "Feature",
"properties": {
"address": "Yomou",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-9.25,
7.566667
]
}
},
{
"type": "Feature",
"properties": {
"address": "Nzerekore",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-8.816667,
7.75
]
}
},
{
"type": "Feature",
"properties": {
"address": "Macenta",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-9.466667,
8.55
]
}
},
{
"type": "Feature",
"properties": {
"address": "Faranah",
"country": "Guinea"
},
"geometry": {
"type": "Point",
"coordinates": [
-10.733333,
9.05
]
}
},
{
"type": "Feature",
"content": "test"
}
]
}
Now please write a 1-2 sentence description, with a maximum of 40 words, in
the context of the visualization gallery. It should be simple, informative,
and accurate, and should not mention the source of the example. Do not use the
phrase "This example" or "this visualization" in your response. A viewer
should be able to know if they want to look at the code and interact with the
example based on the description alone.
Requirements:
- Keep sentences short; avoid semicolons.
- Avoid starting sentences with "This" or "The"
- Write in the active voice.
- Use a maximum of 40 words.
- Do not use the words "this" or "example" in your response.
Write the description as a single grammatically correct sentence. Do not write a period in the middle of a sentence. End with a period. Use present tense. Format with single linebreaks per sentence, not blank lines.
Final description:
An interactive SVG map plotting Ebola case locations as dots on a Leaflet map, using D3.js for data-driven rendering. The visualization displays geographic coordinates of cases across multiple countries, with animated transitions between views. Built with Mapbox and D3, it serves as a flexible template for geographically based data exploration.
(Note: The description is concise, focuses on the visualization's structure and purpose, and avoids unnecessary detail while matching the metadata provided.)