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Everything posted by Cosme

  1. Hi Eldar, thank you very much. I have been correcting these points by hand, it is possible but very time-consuming if I want to pool together in the same map many different tracks. Best wishes, Cosme
  2. 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
  3. Hello, thank you for our answer Simeon. Since I posted this issue two monts ago I could finally sort this out and realized that. Thank you anyway for your kindness. Cosme.
  4. Hello, thank you for your answer Simeon. You were right! if I use a bigger window, the error dissapear and the result is fine. However now I see that I do not understand what the parameter "windows" means ("the number of neighboring twilights"). Depending of this number the function deletes or not specific twilights. Kind regards, Cosme
  5. Dear all, after spending so many time hand-editing the twilights with preprocessLight from package BAStag, I have just realized that the new inserted twilights had never been saved. I know how the interactive windows work, I have done it many times; but I DO NOT KNOW why in the output, the columns "Twilight" and "Twilight3" are the same. In other words, the new inserted twlights are not saved. Here it is an example: Twilight Rise Deleted Marker Inserted Twilight3 Marker3 387 25/06/2016 20:11 FALSE FALSE 9
  6. Hello everyone! I am trying to use the function twilightEdit from TwGeos, which is supposed to edit and delete twilight outliers automatically. I do not know why I get this error: "Error in x[(window/2) + 1, 2] : subindex out of limits" My code is: readLig <- function(file,skip=0) { ## Read csv file and add column names d <- read.csv(file,header=FALSE,skip=skip, col.names=c("Valid","Date","Julian","Light"), colClasses=c("character","character","numeric","integer")) ## Parse date d$Date <- as.POSIXct(strptime(d$Date,"%d/%m/%y %H:%M:%S
  7. Ok! in fact, the extensive shading events are near the equinox of March (2 weeks before). So we agree that it is more probable that the shading events indicate the arrival to breeding area and the last estimated positions are wrong. In the lat_lon plot I can see a nice period during winter in which the bird was stationary (the month of october). Thus I run the find.stationary.location function for this period, including as initial coordinates these from the lat_lon plot from a given simulation. I understand that this function find a location for a period in which the bird is assume to
  8. Thank you very much for your help Eldar, 1. How do you know that the bird was still on migration? I would say that it is likely that bird had already arrived somewhere (maybe to check other breeding grounds before breeding). If surface is becoming less transparent you will see more or less even darkness, but not several short periods. I said that the bird was still on migration because the last predicted locations of good light records are predicted in the middle of the Sahara desert (i.e. Mauritania), which is not a known breeding range for the barn swallow. It is possible that the bi
  9. Hello everyone, I have attached BAS geolocators (Biotrack - ML6540) on barn swallows breeding in Spain. In every light record (from July to March), I see many shading events at the end of the data (about 7-10 days). I am using the package BAStag, but I see too many shading events at this period to hand-edit these twilights. So I think the best option is to drop off this last records. I think the biological meaning of these extensive shading events is the beguining of the nesting period at the breeding sites, i.e. birds spend nights at their nests. However, I have some tracks in whi
  10. Thank you stormpetrel, I know that it is recommended to use a light stalk when attaching as leg-loop. However, there are already studies that have tried a leg-loop position without any light stalk: https://www.researchgate.net/profile/Malcolm_Burgess2/publication/288038790_An_experimental_evaluation_of_the_effects_of_geolocator_design_and_attachment_method_on_between-year_survival_on_Whinchats_Saxicola_rubetra/links/56f12ad608ae6cccf439dad7.pdf I put on the last year 64 tags with a small light stalk and I obtained nice results. However, I noticed a significant reduced survival rate of
  11. Yes, sorry! the model of my tag is ML650 (Biotrack). My study species is the barn swallow, and my purpose is to determine the migratory routes and winter areas, as well as testing the effects of the tag on survival and posterior reproduction. Thank you
  12. Hello everyone! I wonder if the quality of light data obtained by a geolocator tagged like in this picture, is good enough: http://blog.une.edu/perlutlab/files/2013/03/Martin-with-geolocator-reduced.jpg It is a tag without stalk, attached as leg-loop position. Thank you very much in advance! Cosme
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