By drawing a circle of appropriate size around each of the points, we can visually locate the place where the three circles intersect: it's east of the JRO station and north of TIMB, a few kilometers south of Mt. We know the locations of the three recorders, and the great circle distance from each station to the epicenter of the tremor (the distance is calculated using the time lapse between the arrival of different kinds of earthquake waves), so we should be able to triangulate its position. This example shows data from three seismographs that all recorded an earthquake. NOTE: This works with any kind of maps that GPS Visualizer can produce: Leaflet, Google Maps, Google Earth, JPEG, PNG, or SVG. If you separate a list of distances with commas (e.g., "10mi,20mi,30mi"), you can even draw multiple rings around multiple points see the second example on this page. However, if you want to draw circles around multiple points using the Calculators page, you'd have to save all of the coordinates separately and then upload them to a map form.īut there's an easier way to do it: if you go to the map input form and supply a "circle_radius" or "range_ring" field in a manually-created waypoint file (plain text or a spreadsheet see the tutorial for more info), you can simultaneously draw circles around multiple points. GPS Visualizer's Geographic Calculators page has a form that allows you to draw a circle of any radius around a specific latitude and longitude.
No ads? No problem! You can support GPS Visualizer by making a donation with PayPal instead.ĭrawing circles around multiple points Triangulation & range ring examples
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