zvals.default: zvals.default function
Description
Default method for extracting 'z values' looks for $Zm, $Z,
$z in that order.Usage
## S3 method for class 'default':
zvals(obj, ...)
See Also
xvals, yvals, zvals,
xvals.default, yvals.default,
xvals.fromXYZ, yvals.fromXYZ,
zvals.fromXYZ, xvals.SpatialGridDataFrame,
yvals.SpatialGridDataFrame,
zvals.SpatialGridDataFrame