Good morning Jim. This is awesome start, visualization is splendid, thank you very much.
I have signed on to r-sig-geo and submitted my question there. I have no idea of the volume of traffic on that list However, hopefully, I will gain additional insight into how to determine max number of member locations in the most minimum radius area. Have a great day! WHP Proprietary -----Original Message----- From: Jim Lemon <drjimle...@gmail.com> Sent: Wednesday, May 13, 2020 1:39 AM To: Poling, William <poli...@aetna.com> Cc: r-help@r-project.org Subject: [EXTERNAL] Re: [R] Help with Radius problem **** External Email - Use Caution **** Hi Bill, A while ago I devised a couple of functions to accumulate millions of geographic locations of events and then display the resulting matrix of values on an existing plot. This may be of use to you, at least in the visualization of the density of the locations. As your example data only included a few points, the resulting plot looks pretty chunky as I had to use a large symbol to make the cells with non-zero counts obvious. # read in your sample data source("wp_data.R") library(plotrix) geomat<-makeDensityMatrix(geodat[,c("latitude","longitude")], xlim=range(geodat$longitude),ylim=range(geodat$latitude)) # Range of density (>0) - 1.119816 3.922018 latlim<-range(geodat$latitude) lonlim<-range(geodat$longitude) library(maps) map("world",xlim=lonlim,ylim=latlim) axis(1) axis(2) densityGrid(geomat,range.cex=c(1,5),xlim=lonlim,ylim=latlim, red=c(0.5,1),green=0,blue=0,pch=15) Jim On Wed, May 13, 2020 at 10:57 AM Poling, William via R-help <r-help@r-project.org> wrote: > > #RStudio Version Version 1.2.1335 > sessionInfo() > # R version 4.0.0 Patched (2020-05-03 r78349) > #Platform: x86_64-w64-mingw32/x64 (64-bit) #Running under: Windows 10 > x64 (build 17763) > > Hello I am trying to figure out how to create concentration of ID's in > the following data, based on determining the highest concentration in > the smallest radius area based on Longitude and Latitude (geo > location) > > I have reviewed many websites looking for a function or tutorial, (if > you are aware of either please let me know) > NOTICE TO RECIPIENT OF INFORMATION: This e-mail may contain confidential or privileged information. If you think you have received this e-mail in error, please advise the sender by reply e-mail and then delete this e-mail immediately. This e-mail may also contain protected health information (PHI) with information about sensitive medical conditions, including, but not limited to, treatment for substance use disorders, behavioral health, HIV/AIDS, or pregnancy. This type of information may be protected by various federal and/or state laws which prohibit any further disclosure without the express written consent of the person to whom it pertains or as otherwise permitted by law. Any unauthorized further disclosure may be considered a violation of federal and/or state law. A general authorization for the release of medical or other information may NOT be sufficient consent for release of this type of information. Thank you. Aetna ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.