The scale 1:4000 or 1:5000 can be used. Scale
1:4000 is recommended for old and/or narrow downtowns.
According to the certain scale, the contour interval must be
adopted. In general, the
contour interval value should be 2 m for 1:4000 or 2.5 m for 1.5000.
The minimum dimension of a features in a map
is 2 x 2m in its projection.
An object smaller than 2 x 2m can be shown if its
very visible or high.
