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rerddapXtracto - R package for accessing environmental data using ‘rerddap’
rxtracto()now works in coordinate space for projected
data ******
tidy_grid()function to convert result of ‘rxtracto_3D()’
or ‘rxtractogon()’ to “tidy”” long-format ******
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)
and function to convert result of ‘rxtracto_3D()’ or ‘rxtractogon()’ to “tidy”” long-format:
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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