nc_subset: Compute subset coordinates given a bounding box - suitable...

In BigelowLab/spnc: A simplified interface between spatial classes and NetCDF data sources

Description

Pixel center coordinates are typically specified within the 'dim' attribute in the ncdf4 object. Step size between pixel centers is taken to be the mean for all pixels by default, but this can be overridden.

Usage

nc_subset(NC, bb = c(-77, -51.5, 37.9, 56.7), step = nc_step(NC),
  dim_names = c("lon", "lat"))

Arguments

NC	a ncdf4 class object
bb	the 4 element bounding box [left, right, bottom, top]
step	one or two element numeric of the step size.
dim_names	a two element character vector providing the names of the x and y coordinates. By default c('lon', 'lat')

Value

a 5 element list of

• start a 2 element vector of indices to start

• count a 2 element vector number of columns/rows

• ext a 4 element extent that accounts for the pixels sizes - the envelope

• y_ascends logical TRUE if y values are stored low to high

• step two element step size (aka resolution)

BigelowLab/spnc documentation built on May 5, 2019, 2:45 p.m.