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Error Messages using functions i) map.FLightR.ggmap and ii) plot_util_distr


Dear Eldar,


I am sorry for the double post, but I think this got lost in the end of a previous post that was already answered.


I receive two error messages when using the functions map.FLightR.ggmap and  plot_util_distr:


1. map.FLightR.ggmap



Error: longitude of center must be between -180 and 180 degrees. note ggmap uses lon/lat, not lat/lon.
In addition: Warning message:
In min(Result$Results$Quantiles$Medianlon[twilights.index][Result$Results$Quantiles$Medianlon[twilights.index] >  :
  no non-missing arguments to min; returning Inf



Interestingly this only happens when either using certain grid boundaries for the spatial extent or if the bird under investigation uses certain areas, I am not quite sure what the pattern is.


So far I could trigger the error as soon as I extended the right boundary above lon -160 e.g.,


Grid<-make.grid(left=160, bottom=-80, right=-140, top=-10,
                distance.from.land.allowed.to.use=c(-Inf, Inf),
                distance.from.land.allowed.to.stay=c(-Inf, Inf))


will trigger it while


Grid<-make.grid(left=160, bottom=-80, right=-160, top=-10,
                distance.from.land.allowed.to.use=c(-Inf, Inf),
                distance.from.land.allowed.to.stay=c(-Inf, Inf))


does not produce an error.

UPDATE: It actually seems  to occur when a position with longitude >-160 (e.g., -140) is plotted! However, it also occurs sometimes if e.g., longitude >-140 is used.



My feel is that this is also a ggmap related issue and may once again have to do with the dateline.


2. running plot_util_distr error


I don't think it is related as it is a sp error, but I get an error message when running plot_util_distr:


+                 dates=data.frame(as.POSIXct('2016-03-03'), as.POSIXct('2016-08-07')),
+                 add.scale.bar=TRUE, percentiles=0.5)
function will plot 308 twilights
Error in sp::CRS(aeqd) : major axis or radius = 0 or not given



I am very thankful about your comments on this.


All the best and keep up the great work Eldar!,



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3 answers to this question

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 Hi Hendrik,

 Looks like dateline issue. Could you send me your results file (via email) and I will have a look.


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Thanks Eldar,



map.FLightR.ggmap works fine for me now. The plot_util_distr only caused me trouble on my macOS machine, turned out it works fine on windows.


Thank you very much for your help Eldar, very much appreciated!



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