GraphLimits {TrackReconstruction} | R Documentation |
Finds the minimum and maximum of the longitude and latitude and then adds on 2.5% of the latitude and longitude to create boarders in the graph and accounts in a very simple way for projection distortion so long as maps are not to large.
GraphLimits(infile)
infile |
A file with columns of latitude and longitude labeled as Latitude and Longitude |
Internal function used in the Mapper
function. It attempts to account for the change in distance covered between longitude as latitude changes
by using the cos(latitude) of the center of the latitude of the graph, and adjusting the longitude to cover the same distance. Hence, the boarders
on the graph are set first by making the distances in latitude and longitude approximately equal in meters, then 2.5% is added on each end.
Returns a list of 4 scalars defining the boarders of the data
Brian Battaile
#Standardize tag output
betas<-Standardize(1,1,-1,1,1,1,-57.8,68.76,-61.8,64.2,-70.16,58.08,-10.1,9.55,-9.75,9.72,
-9.91,9.43)
#get declination and inclination data for study area
decinc<-c(10.228,65.918)
#data set with 11 associated GPS fixes in the "gpsdata" data set
data(rawdata)
DRoutput<-DeadReckoning(rawdata ,betas, decinc, Hz = 16, RmL = 2, DepthHz = 1, SpdCalc=3,
MaxSpd=3.5)
#prepare GPS data
data(gpsdata02)
gpsformat<-GPStable(gpsdata02)
Georeferenced<-GeoReference(DRoutput,gpsformat[1:2,])
Limits<-GraphLimits(Georeferenced)
Limits