rerddapXtracto - R package for accessing environmental data using ‘rerddap’
rxtracto()option to use the ERDDAP “Interpolate service”, which can greatly speed up extracts for large tracks. ******
rxtracto() major rewrite of this function to reduce the number of requests made to the ERDDAP server, and to improve overall speed. ******
rerddapXtracto is an R package developed to subset and extract satellite and other oceanographic related data from a remote ERDDAP server. The program can extract data for a moving point in time along a user-supplied set of longitude, latitude, time and depth points; in a 3D bounding box; or within a polygon (through time).
There are also two plotting functions, plotTrack() and plotBox() that make use of the plotdap package. See the new rerdapXtracto vignette.
There are three main data extraction functions in the rerddapXtracto package:
rxtracto <- function(dataInfo, parameter = NULL, xcoord = NULL, ycoord = NULL, zcoord = NULL, tcoord = NULL, xlen = 0., ylen = 0., zlen = 0., xName = 'longitude', yName = 'latitude', zName = 'altitude', tName = 'time', interp = NULL, verbose = FALSE, progress_bar = FALSE)
rxtracto_3D <- function(dataInfo, parameter = NULL, xcoord = NULL, ycoord = NULL, zcoord = NULL, tcoord = NULL, xName = 'longitude', yName = 'latitude', zName = 'altitude', tName = 'time', verbose = FALSE)
rxtractogon <- function(dataInfo, parameter, xcoord = NULL, ycoord = NULL, zcoord = NULL, tcoord = NULL, xName = 'longitude', yName = 'latitude', zName = 'altitude', tName = 'time', verbose = FALSE)
and two functions for producing maps:
plotTrack <- function(resp, xcoord, ycoord, tcoord, plotColor = 'viridis', myFunc = NA, mapData = NULL, crs = NULL, animate = FALSE, cumulative = FALSE, name = NA, shape = 20, size = .5)
plotBBox <- function(resp, plotColor = 'viridis', time = NA, myFunc = NA, mapData = NULL, crs = NULL, animate = FALSE, cumulative = FALSE, name = NA, maxpixels = 10000)
For data requests that cross the dateline for datasets that are on a (-180, 180) longitude grid, there are some important caveats:
rerddapXtracto uses the rerddap, ncdf4 , parsedate, plotdap and sp packages , and these packages (and the packages imported by these packages) must be installed first or rerddapXtracto will fail to install.
{r install,eval=FALSE} install.packages("ncdf4") install.packages("parsedate") install.packages("plotdap") install.packages("rerddap") install.packages("sp")
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