different between neatline vs sheetline

English

neatline (plural neatlines)

(cartography) The innermost line near the edge of a printed map which separates it from the margin.
The horizontal neatlines were formed by lines of latitude.
(construction) The line on plan to which a structure is to be built, usually ignoring any small irregularities of the building material.
The margin of a drawing.

sheet +? line

sheetline (plural sheetlines)

(cartography) Any of the edges of a map, as shown in a map index, used to define each sheet's extent.
The sheetlines were chosen to ensure coverage of the National Park on one sheet.

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