coordError: Coordinate error

In rangeBuilder: Occurrence Filtering, Geographic Standardization and Generation of Species Range Polygons

Coordinate error

Description

Calculates the potential error in coordinates due to lack of coordinate precision.

Usage

coordError(coords, nthreads = 1)

Arguments

coords	longitude and latitude in decimal degrees, either as a long/lat vector, or as a 2-column table. Can be either as numeric or character format
nthreads	number of threads to use for parallelization of the function. The R package parallel must be loaded for nthreads > 1.

Details

This function assumes that the true precision of the coordinates is equivalent to the greatest number of decimals in either the longitude or latitude that are not trailing zeroes. In other words:
(-130.45670, 45.53000) is interpreted as (-130.4567, 45.5300)
(-130.20000, 45.50000) is interpreted as (-130.2, 45.5)

If we use (-130.45670, 45.53000) as an example, these coordinates are interpreted as (-130.4567, 45.5300) and the greatest possible error is inferred as two endpoints: (-130.45670, 45.53000) and (-130.45679, 45.53009)

The distance between these two is then calculated and returned.

Value

Returns a vector of coordinate error in meters.

Author(s)

Pascal Title

Examples

data(crotalus)

xy <- crotalus[1:100, c('decimallongitude','decimallatitude')]

coordError(xy)

rangeBuilder documentation built on Oct. 31, 2024, 1:08 a.m.