Dist.WREG: Distance calculation (WREG) In USGS-R/WREG: USGS WREG v. 2.02

Description

Dist.WREG calculates the distance between two points defined by Latitude-Longitude coordinates in decimal degrees.

Usage

 1 Dist.WREG(Lat1, Long1, Lat2, Long2, method = 2)

Arguments

 Lat1 Latitude of the first point, in decimal degrees. Long1 Lonigtude of the first point, in decimal degrees. Lat2 Latitude of the second point, in decimal degrees. Long2 Longitude of the second point, in deceimal degrees. method Idicates which technique to use for distance calculation. See details.

Details

Dist.WREG is capable of using two techniques to calculate intersite distances. method==1 indicates that the "Nautical Mile" approximation should be used. This is the function that is currently employed by WREG v. 1.05. Each arcminute is equal to 1852 meters. method==2 indicates that the Haversine approximation should be used.

Value

Returns the distance between the two sites in miles.

Examples

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 # Import some example data peakFQdir <- paste0( file.path(system.file("exampleDirectory", package = "WREG"), "pfqImport")) gisFilePath <- file.path(peakFQdir, "pfqSiteInfo.txt") importedData <- importPeakFQ(pfqPath = peakFQdir, gisFile = gisFilePath) # For two sites, compute the inter-site distance # Use the haversine approximation intersiteDistance <- Dist.WREG(Lat1 = importedData\$BasChars\$Lat[1], Long1 = importedData\$BasChars\$Lat[1], Lat2 = importedData\$BasChars\$Lat[2], Long2 = importedData\$BasChars\$Lat[2], method = 2) print(intersiteDistance)

USGS-R/WREG documentation built on May 9, 2019, 6:48 p.m.