Skip to contents

Get coverage metadata from a <WCSCoverageSummary> object.

Source: R/utils.R
emdn_get_bbox.Rd

Get coverage metadata from a <WCSCoverageSummary> object.

Usage

emdn_get_bbox(summary)

emdn_get_WGS84bbox(summary)

emdn_get_band_nil_values(summary)

emdn_get_band_descriptions(summary)

emdn_get_band_uom(summary)

emdn_get_band_constraints(summary)

emdn_get_grid_size(summary)

emdn_get_resolution(summary)

emdn_get_coverage_function(summary)

emdn_get_temporal_extent(summary)

emdn_get_vertical_extent(summary)

emdn_get_dimensions_info(
  summary,
  format = c("character", "list", "tibble"),
  include_coeffs = FALSE
)

emdn_get_dimensions_names(summary)

emdn_get_dimensions_n(summary)

emdn_get_dimension_types(summary)

Arguments

summary

a <WCSCoverageSummary> object.

format

character string. Coverage dimension info output format. One of "character" (default), "list" or "tibble".

include_coeffs

whether to include a vector of temporal or vertical dimension coefficients (if applicable) in the coverage dimension info "list" output format. Defaults to FALSE. Ignored for other formats.

Value

  • emdn_get_bbox: an object of class bbox of length 4 expressing the boundaries coverage extent/envelope. See sf::st_bbox() for more details.

  • emdn_get_WGS84bbox: an object of class bbox of length 4 expressing the boundaries coverage extent/envelope. See sf::st_bbox() for more details.

  • emdn_get_band_nil_values a numeric scalar of the value representing nil values in a coverage.

  • emdn_get_band_descriptions a character vector of band descriptions.

  • emdn_get_band_uom a character vector of band units of measurement.

  • emdn_get_band_constraints a list of numeric vectors of length 2 indicating the min and max values of the data contained in each bands of the coverage.

  • emdn_get_grid_size a numeric vector of length 2 giving the spatial size in grid cells (pixels) of the coverage grid (ncol x nrow)

  • emdn_get_resolution a numeric vector of length 2 giving the spatial resolution of grid cells (size in the x dimension, size in the y dimension) of a coverage. The attached attribute uom gives the units of measurement of each dimension.

  • emdn_get_coverage_function a list with elements:

    • sequence_rule, character string, the function describing the sequence rule, i.e. the relationship between the axes of data and coordinate system axes.

    • starting_point a numeric vector of length 2, the location of the origin of the data in the coordinate system.

    • axis_order a character vector of length 2 specifying the axis order and direction of mapping of values onto the grid, beginning at the starting point. For example, "+2 +1" indicates the value range is ordered from the bottom left to the top right of the grid envelope - lowest to highest in the x-axis direction first (+2), then lowest to highest in the y-axis direction (+1) from the starting_point.

  • emdn_get_temporal_extent if the coverage has a temporal dimension, a numeric vector of length 2 giving the min and max values of the dimension. Otherwise, NA.

  • emdn_get_vertical_extent if the coverage has a vertical dimension, a numeric vector of length 2 giving the min and max values of the dimension. Otherwise, NA.

  • emdn_get_dimensions_info output depends on format argument:

    • character: (default) a concatenated character string of dimension information

    • list: a list of dimension information

    • tibble: a tibble of dimension information

Functions

  • emdn_get_bbox(): Get the bounding box (geographic extent) of a coverage. Coordinates are given in the same Coordinate Reference System as the coverage.

  • emdn_get_WGS84bbox(): Get the bounding box (geographic extent) of a coverage in World Geodetic System 1984 (WGS84) Coordinate Reference System (or EPSG:4326).

  • emdn_get_band_nil_values(): Get the value representing nil values in a coverage.

  • emdn_get_band_descriptions(): Get the band descriptions of a coverage.

  • emdn_get_band_uom(): Get the units of measurement of the data contained in the bands values of a coverage.

  • emdn_get_band_constraints(): Get the range of values of the data contained in the bands of the coverage.

  • emdn_get_grid_size(): Get the grid size of a coverage.

  • emdn_get_resolution(): Get the resolution of a coverage.

  • emdn_get_coverage_function(): Get the grid function of a coverage.

  • emdn_get_temporal_extent(): Get the temporal extent of a coverage.

  • emdn_get_vertical_extent(): Get the vertical (elevation) extent of a coverage.

  • emdn_get_dimensions_info(): Get information on dimensions of a coverage in various formats. Information includes dimension label, type, unit and range (in tibble format).

  • emdn_get_dimensions_names(): Get coverage dimension names (labels) and units.

  • emdn_get_dimensions_n(): Get number of coverage dimensions.

  • emdn_get_dimension_types(): Get dimensions types of a coverage.

Examples

wcs <- emdn_init_wcs_client(service = "biology")
#> ✔ WCS client created succesfully
#> ℹ Service: <https://geo.vliz.be/geoserver/Emodnetbio/wcs>
#> ℹ Service: "2.0.1"
summaries <- emdn_get_coverage_summaries_all(wcs)
summary <- summaries[[1]]
# get bbox
emdn_get_bbox(summary)
#> Loading required package: sf
#> Linking to GEOS 3.10.2, GDAL 3.4.2, PROJ 8.2.1; sf_use_s2() is TRUE
#>   xmin   ymin   xmax   ymax 
#> -75.05  34.95  20.05  75.05 
# get WGS84 bbox
emdn_get_WGS84bbox(summary)
#>   xmin   ymin   xmax   ymax 
#> -75.05  34.95  20.05  75.05 
# get the nil value of a coverage
emdn_get_band_nil_values(summary)
#> Relative abundance     Relative error 
#>        9.96921e+36        9.96921e+36 
# get coverage band descriptions
emdn_get_band_descriptions(summary)
#> [1] "Relative abundance" "Relative error"    
#> attr(,"uom")
#> [1] "W.m-2.Sr-1" "W.m-2.Sr-1"
# get band units of measurement
emdn_get_band_uom(summary)
#> Relative abundance     Relative error 
#>       "W.m-2.Sr-1"       "W.m-2.Sr-1" 
# get range of band values
emdn_get_band_constraints(summary)
#> $`Relative abundance`
#> [1] -3.402823e+38  3.402823e+38
#> 
#> $`Relative error`
#> [1] -3.402823e+38  3.402823e+38
#> 
# get coverage grid size
emdn_get_grid_size(summary)
#> ncol nrow 
#>  951  401 
# get coverage resolution
emdn_get_resolution(summary)
#>   x   y 
#> 0.1 0.1 
#> attr(,"uom")
#> [1] "Deg" "Deg"
# get coverage grid function
emdn_get_coverage_function(summary)
#> $sequence_rule
#> [1] "Linear"
#> 
#> $start_point
#> [1] 0 0
#> 
#> $axis_order
#> [1] "+2" "+1"
#> 
# get the extent of the temporal dimension
emdn_get_temporal_extent(summary)
#> [1] "1958-02-16T00:00:00" "2016-11-16T00:00:00"
# get the extent of the vertical dimension
emdn_get_vertical_extent(summary)
#> [1] NA
# get information about coverage dimensions in various formats
emdn_get_dimensions_info(summary)
#> lat(deg):geographic; long(deg):geographic; time(s):temporal
emdn_get_dimensions_info(summary, format = "list")
#> $dim_1
#> $dim_1$label
#> [1] "Lat"
#> 
#> $dim_1$uom
#> [1] "Deg"
#> 
#> $dim_1$type
#> [1] "geographic"
#> 
#> 
#> $dim_2
#> $dim_2$label
#> [1] "Long"
#> 
#> $dim_2$uom
#> [1] "Deg"
#> 
#> $dim_2$type
#> [1] "geographic"
#> 
#> 
#> $dim_3
#> $dim_3$label
#> [1] "time"
#> 
#> $dim_3$uom
#> [1] "s"
#> 
#> $dim_3$type
#> [1] "temporal"
#> 
#> 
emdn_get_dimensions_info(summary, format = "tibble")
#> # A tibble: 3 × 5
#>   dimension label uom   type       range                                    
#>       <int> <chr> <chr> <chr>      <chr>                                    
#> 1         1 lat   deg   geographic NA                                       
#> 2         2 long  deg   geographic NA                                       
#> 3         3 time  s     temporal   1958-02-16T00:00:00 - 2016-11-16T00:00:00
# get dimension names
emdn_get_dimensions_names(summary)
#> [1] "Lat (Deg), Long (Deg), time (s)"
# get number of dimensions
emdn_get_dimensions_n(summary)
#> [1] 3
# get dimensions types
emdn_get_dimension_types(summary)
#> [1] "geographic" "geographic" "temporal"