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View Code? Open in Web Editor NEWMapping of earthquakes with USGS data using Javascript D3 visualization library and ES6 Promise based code
Mapping of earthquakes with USGS data using Javascript D3 visualization library and ES6 Promise based code
There is incorrect info card data in some situations. See screenshot.
The reason is the algorithm used for detecting the earthquake location being hovered over. It uses a second hidden canvas with each of the dots given a different rgb blue value. For example location 0 is given rgb(0, 0, 0) while location 1 is given rgb(0, 0, 1) etc. Upon hover the color is retrieved from the hover location to determine the earthquake id.
This usually works well.
However, if there are dots in close proximity due to anti-aliasing the pixels on the outer edge may actually be a rgb shade resulting in the wrong data being displayed by the info card.
Could consider using putImageData
and manually set the hidden canvas pixel colors as a solution.
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