Hello every one, I have a problem with the function kerneloverlap in Adehabitat, I´m working in spatial ecology about Bonelli´s eagle with GPS data, I will calculate the degree of overlap in the same individual beetwen years. For that I want to use kerneloverlap from adehabitatHR package.
First I create a dataframe with SpatialPointDataFrame head(prueba) coordinates buena.ano 1 (717551, 4681540) 2007 2 (717620, 4681540) 2007 3 (716803, 4681270) 2007 4 (716803, 4681270) 2007 5 (717563, 4678210) 2008 6 (717205, 4679400) 2008 Coordinate Reference System (CRS) arguments: NA Second Use this data frame in funcion kerneloverlap > uno <- kerneloverlap(prueba, method = "UDOI" , percent = 95, conditional = TRUE) 2007 2008 2009 2010 2011 2007 2.205176 1.277825 1.699809 1.850343 1.695589 2008 1.277825 2.025550 1.650467 1.630433 1.244362 2009 1.699809 1.650467 2.237205 1.901793 1.612252 2010 1.850343 1.630433 1.901793 2.532441 1.650993 2011 1.695589 1.244362 1.612252 1.650993 2.051450 Here, there is my first problem, the index are more than 1in all case ( This will be interpretate like a nonuniformily distributes and have a high degree of overlap) but it is different between year also. I try to change de grid but is not enought. After when I change de isoplenth for example level = 50, the index is wrong. dos <- kerneloverlap(prueba, method = "UDOI" , percent = 50, conditional = TRUE) > dos 2007 2008 2009 2010 2011 2007 0.2616757 0.1693210 0.1964589 0.2143231 0.2015972 2008 0.1693210 0.2744389 0.2153117 0.2390093 0.1757627 2009 0.1964589 0.2153117 0.2679013 0.2500824 0.2213787 2010 0.2143231 0.2390093 0.2500824 0.3052120 0.2208950 2011 0.2015972 0.1757627 0.2213787 0.2208950 0.2872298 and the same happen if I change the method, for example "VI" In adittion, I delate the outliers from the date frame but is not enough. Someone know why it happening?? Will be better calculate the UD before and after use them in kernerloverlaphr function? Thank you for everything. Best Regards -- *Beatriz MartÃnez Miranzo* Departamento de ZoologÃa y AntropologÃa FÃsica Facultad de BiologÃa, Universidad Complutense de Madrid E-28040 Madrid, Spain Tel.: +34 91 394 51 38 Fax: +34 91 394 49 47 email: bmarti...@ucm.es http://www.ucm.es/info/zoo/bcv/pers_beamiranzo.html<http://pendientedemigracion.ucm.es/info/zoo/bcv/pers_beamiranzo.html> [[alternative HTML version deleted]]
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