Extract data on a (ir)regular grid basis

This function takes the files from metnordic_merge_hourly() and extracts timeseries at desired locations. If a polygon shapefile is passed to the function, data will be extracted at each grid cells within the (buffered) area. If a point geometry is supplied, data will be extracted at each point. A file is written to disk with .csv file for each grid cell and a metadata file for each grid cell.

Usage

metnordic_extract_grid(
  merged_path,
  area,
  buffer = 0,
  mn_variables,
  outdir,
  meta_shp = FALSE,
  verbose
)

Arguments

merged_path

String, Path to merged ncdf files from metnordic_merge_hourly()

area

Geo-referenced shapefile either of polygon or point geometry. Passing a polygon geometry will lead to a regular grid being extracted from all overlaying points.

buffer

Numeric, buffer in meters. Useful for getting grid cells just outside of catchment. Not used if a point geometry is passed.

mn_variables

Character Vector, Met Nordic variables to extract

outdir

String, Folder where data will be written

meta_shp

If set to TRUE, then a shapefile of the extracted grid points with ID will be written to the outdir

verbose

Boolean, print status

Value

path to written files