I am using the swaRm package to analyse decimal degree GPS data in order to find location errors (https://rpubs.com/sjmgarnier/swaRm).
Firstly I have created an R6 object from my data frame to create a trajectory table
F108traj<-makeTraj(x = F108$Longitude, y = F108$Latitude, id = "01",
date = F108$Date, time = F108$Time,
date.format = "dmy", time.format = "hms",
geo = TRUE)
Then I have used the code to search for potential location errors
loc_err <- findLocErr(F108traj)
loc_err
which then returns this:
integer(0)
I was wondering if someone could explain to me what this means? I find it very hard to believe that there are no location errors as I have 55657 GPS fixes!
Here is a small section of the data:
Date Time Latitude Longitude
12/06/2017 12:25:00 50.774715 -3.932923
12/06/2017 12:25:01 50.774742 -3.932912
12/06/2017 12:25:02 50.774773 -3.932896
12/06/2017 12:25:04 50.774792 -3.932908
12/06/2017 12:25:05 50.774803 -3.932924
12/06/2017 12:25:06 50.774803 -3.932924
12/06/2017 12:25:07 50.774803 -3.932924
12/06/2017 12:25:08 50.774803 -3.932924
12/06/2017 12:25:10 50.774803 -3.932924
12/06/2017 12:25:11 50.774803 -3.932924
12/06/2017 12:25:12 50.774803 -3.932924
12/06/2017 12:25:14 50.774803 -3.932924
12/06/2017 12:25:15 50.774803 -3.932924
12/06/2017 12:25:16 50.774803 -3.932924
I should also mention that fixes were recorded every second, but there are instances where the GPS has failed
