chmAddOverview {NGCHM}

Generate an overview image of the NGCHM when making it.

Description

Generate an overview image of the NGCHM when making it. By default, the system generates no default overview images. If only one of width or height is specified, the other is calculated based on the aspect ratio of the map.

Usage

chmAddOverview(chm, format, width, height)

## S4 method for signature 'ngchm,character,optNumeric,optNumeric'
chmAddOverview(chm, format, width, height)

Arguments

chm

The chm to add the overview to.

format

The format of the overview ('pdf', 'png', or 'svg').

width

The width of the overview.

height

The height of the overview.

Value

The extended chm.