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Determine if GRasters and/or GVectors are geographically comparable

Source: R/compareGeom.r
compareGeom.Rd

compareGeom() compares geographic metadata between two or more GRasters and/or GVectors. In many cases, spatial objects must be comparable for them to "interact" (e.g., conducting arithmetic operations, masking, etc.).

Usage

# S4 method for class 'GRaster,GRaster'
compareGeom(
  x,
  y,
  ...,
  location = TRUE,
  mapset = TRUE,
  topo = TRUE,
  lyrs = FALSE,
  crs = TRUE,
  ext = TRUE,
  zext = TRUE,
  rowcol = TRUE,
  depths = TRUE,
  res = TRUE,
  zres = TRUE,
  stopOnError = TRUE,
  messages = TRUE
)

# S4 method for class 'GVector,GVector'
compareGeom(
  x,
  y,
  ...,
  location = TRUE,
  mapset = TRUE,
  topo = FALSE,
  crs = TRUE,
  ext = FALSE,
  zext = FALSE,
  geometry = FALSE,
  stopOnError = TRUE,
  messages = TRUE
)

# S4 method for class 'GRaster,GVector'
compareGeom(
  x,
  y,
  ...,
  location = TRUE,
  mapset = TRUE,
  topo = FALSE,
  crs = TRUE,
  ext = FALSE,
  zext = FALSE,
  stopOnError = TRUE,
  messages = TRUE
)

# S4 method for class 'GVector,GRaster'
compareGeom(
  x,
  y,
  ...,
  location = TRUE,
  mapset = TRUE,
  topo = FALSE,
  crs = TRUE,
  ext = FALSE,
  zext = FALSE,
  stopOnError = TRUE,
  messages = TRUE
)

Arguments

x, y, ...

GRasters or GVectors. If y is GRaster, then the ... must also be GRasters (or missing). If y is GVector, then the ... must also be GVectors (or missing).

location, mapset

Logical: Compare GRASS "locations" and "mapsets". Default is TRUE.

topo

Logical: Test for same topology (2D or 3D). By default, this is TRUE for raster-raster comparisons, and FALSE for all others.

lyrs

Logical (rasters only): Compare number of layers of "stacked" rasters. Note this is different from number of vertical "depths" of a raster. Default is FALSE.

crs

Logical: Compare coordinate reference systems. Default is TRUE.

ext

Logical: If TRUE, test for same extent. By default, is TRUE for raster-raster comparison and FALSE for all others.

zext

Logical: Test for same vertical extents (3D only). By default, this is TRUE for raster-raster comparisons, and FALSE for all others.

rowcol

Logical (rasters only): Test for same number of rows and columns. Default is TRUE.

depths

Logical (rasters only): Test for same number of depths. Default is TRUE.

res

Logical (rasters only): Test for same resolution in x- and y-dimensions. Default is TRUE.

zres

Logical (rasters only): Test for same resolution in z dimension. Default is TRUE.

stopOnError

Logical: If TRUE (default), throw an error with an explanation if the objects are not comparable. If FALSE (default), return TRUE or FALSE.

messages

Logical: If TRUE (default), display a warning if a condition is not met. This only comes into effect if stopOnErrorisFALSE`.

geometry

Logical (vector-vector comparison only): Compare geometry. Default is FALSE.

Value

Logical (invisibly): TRUE for no mismatches detected, FALSE for incompatibility), or side effect of throwing an error.