Hi, i am using spatstat package for spatial data analysis and now i have a problem to create a point pattern. The points are in file "points.txt" (first column for Latitude and second column for Longitude ) and I imported them and separated each columns in two arrays x and y. If I plots x and y ( e.g plot(x,y) ) the result appears in square area without problems and the scale is adequate to visual analysis of points ploted. But if i try to use ppp function to create a point pattern the result appears in rectangle area with a poor scale, dificulting in this case the analysis of the points. I think that is probably because of xrange and yrange parameter of ppp function, that was calculated based on max and min values of both x and y, but i am not sure:
latitude <- dataset$V2 longitude <- dataset$V3 xrange <-c(min(longitude), max(longitude)) yrange <-c(min(latitude), max(latitude)) area <- ppp(longitude/10000, latitude/100000, xrange, yrange) /* there are 181 point in file */ plot(longitude, latitude) / * square area of visualisation has an adequate scale to analysis */ plot(area) /* poor rectangle area of visualisation showing point too concentrated and hiding details - possible hot spots */ Is there a way of automatically define the size of window parameter (owin object) in ppp function from dataset of points? How can i scale the window without problems like: "warning message: 181 points were rejected as lying outside the specified window" Thanks Ricardo ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
