A “Zoom to” makes it easy to find a specific earthquake on the map. To provide a quick overview of last year’s most important earthquakes, I’m displaying a list of all earthquakes with magnitude 7 or greater. To create this type of visualization, I used a SimpleRenderer with two visual variables: a colorVariable and a sizeVariable. For the smaller earthquakes, I think it’s important to see that they are many, but the differences between them are not so important, so a small symbol for all of them works as well. I made this decision because I wanted to see the nuances when it comes to bigger earthquakes (which also occur less frequently). 14:19:58 - Magnitude 1 - Victoria, BC - Earthquake M1.8 - 86 km WSW of Victoria, BC. Magnitude 3 - Tofino, BC - Earthquake M3.3 - 236 km W of Tofino, BC. It is an interesting mix between a visualization with classes and a continuously mapped values. Terrorism/Suspicious Activity Amber Alert Map HAZMAT Situations Map Forest Fires Map Disease Outbreaks Map Gang Activity Map Border Security Issues. Between 6 and 7 the values are interpolated, which is why there are also middle sized, orange spheres. For this reason, the earthquakes between 4 and 6 are represented as small, yellow spheres and the ones stronger than 7 as large, dark red spheres. I wanted to have a clear distinction between earthquakes that go beyond a magnitude of 6 and produce catastrophic damage and the ones lower than 6. The magnitude of the earthquake was mapped both on the size and the color of the symbols. In ArcGIS API for JavaScript I am waiting for the view to finish updating to make sure that all the points are loaded, and then I call the goTo() method moving 0.1 degree longitude east on every frame. The globe displays all global earthquakes which occurred in the last hour, day, week and month, with a separate option to view significant quakes which had noticable impact on humanity and neighboring communities. How did I rotate the globe? Rotating basically means moving the camera around the globe. The 3D WebGL Globe is a data visualization of all earthquakes on our tiny planet. This is why the application initially starts with the globe rotating: However, it becomes easier to locate the points in space when the scene is in motion. In addition to providing several live sources of current Earthquake information, an Atlas database is also included. The Atlas database shows over 4000 years of Historic Earthquake information. In this map, the exaggerated depth makes it even harder! The basemap is also very minimal, containing only the borders of the countries and those of the tectonic plates. This database (updated periodically) is built-in to Earthquake 3D and is available even when you are off-line. In images of 3D maps it’s sometimes hard to figure out where the features are in space. In this case featureExpresionInfo.expression = "-$pth * 6". How to exaggerate the depth of the earthquakes? With ArcGIS API for JavaScript you can set the featureExpressionInfo on the elevationInfo property of the CSVLayer. Take for example the Tonga trench, a very active tectonic region with many earthquakes reaching very deep, all the way to 700km. The earthquakes are stretched now much more and you can notice differences between regions. On the right, the earthquake depths are exaggerated by a factor of 6. Notice how you couldn’t really tell the difference between a 12km deep earthquake and a 410km deep earthquake. The screenshot on the left is using real depth. If you prefer the full suite of event data for a single event, use the GeoJSON Detail Feed.Comparison between a visualization with exaggerated depth and without. This feed contains a subset of the event data for the event lists. Seismological data which is intended to cover a broad range ofįields of application in modern seismology.Ī format for encoding a variety of geographic data structures. A flexible, extensible and modular XML representation of
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