Cosme Posted March 5, 2018 Share Posted March 5, 2018 Dear all, I am trying to geographically illustrate the 95% Credible Intervals of the estimated positions along the track. My goal is to obtain a polygon defined as the "concave minimum polygon" of positions UCI and LCI, which indicate the upper and lower limits of the 95% credible intervals (or confidence intervals). The depiction of this error is nicely illustrated by the lat/long plots, but I wanted to show them geographically explicit within a map. My problem is: the line defined by UCI crosses the line defined by LCI during first October. Interestingly, lines cross each other close to the Greenwhich Meridian. So I wonder if the CI limits are inverted when the bird travel through the Greenwhich Meridian, because the longitude changes from positive to negative, or vice-versa. I also wonder if the equinox may be involved in this. In summary, UCI and LCI positions build up a polygon with the shape of a sandglass. How are the UCI and LCI positions calculated in FLightR? Best whises, Cosme sandglass Link to comment Share on other sites More sharing options...
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