DRAPE (Drape)

Type: Batch application

Drapes entities onto DTM surface and (or) the intersection of lines.

Detailed Description

Searches for entities within layers specified and drapes over existing DTM surface and (or) lines over existing lines.

Some of the draping options include:

The ability to drape line points to the existing DTM surface and intersect those same lines against lines in other layers.
Lines, symbols and text may be duplicated when draping, leaving the original entity unmodified.
Wall lines may be added that connect duplicate entities.
The ability to add or subtract the interpolated elevation to the existing elevation.

To Drape Entities onto the DTM Surface

'Free DTM after use' must be set to No in SetDtm
A DTM surface must be active by running RunDtm
The Z source must be set to 'DTM surface if active

The DTM does not need to be active if only intersecting lines to other lines in the file(s).

Layers that are turned off will not be considered when searching.

Available Key-ins

Key-in	Description	Range
WsTc=	Workspaces to consider	0 - Current 1 - All
SeaLay=	Layers to search	Number line
DraLin=	Drape line mode	0 - Don't drape lines 1 - Drape lines to DTM surface. 2 - Drape lines to DTM surface and intersect lines to other lines 3 - Intersect lines to other lines
DraSym=	Drape symbols to DTM surface?	0 – No 1 - Yes
DraTex=	Drape text to DTM surface?	0 – No 1 – Yes
EleOpe	Elevation operator	0 – Equal 1 – Add 2 - Subtract
DraAct=	Drape action	0 - Move entities to DTM or other lines 1 - Duplicate entities to DTM or other lines
AddWal=	Add wall lines on duplicate entities	0 – No 1 – Yes
IntLay=	Layer(s) containing lines to intersect drape lines with	Number line
ParFil=	Load parameter file	Drape parameter file name (.dra)
Run	Run Drape

Parameters for Drape

Workspaces to consider

This parameter defines the workspaces to consider when running Drape.

Layers to search

The layers that are to be searched to be draped against the current DTM surface or other lines are defined here. A number line may be used to define the layers.

Drape line mode

This parameter defines the mode to use when draping lines which are as follows:

Don't drape lines
Drape lines to DTM surface.
Drape lines to DTM surface and intersect lines to other lines
Intersect lines to other lines

Drape symbols?

If this parameter is set to yes then symbols will be draped onto the DTM surface.

Drape text?

If this parameter is set to yes then text labels will be draped onto the DTM surface.

Entity drape action

Lines that are draped may be moved or copied and this action is specified by this parameter. Options are:

Move entities to DTM or other lines
Duplicate entities to DTM or other lines

Elevation operator

When a line, symbol or text label is draped a drape elevation is computed. This elevation is based on the target surface which is either the DTM surface or other lines in the file. Normally the entity to be draped is placed on this surface which is Elevation operator of equal. It is possible to add or subtract the draped elevation from the original elevation. This is useful when applying a delta surface to existing entities.

Add wall lines?

If the Entity drape action is set to “Duplicate” then it is possible to draw lines that represent the wall between the original entity and the new draped entity.

Wall lines layer

This parameter specifies the layer to place wall lines into.

Layer to intersect lines

If the Drape line mode is set to intersect lines then this parameter specifies the layers to intersect to. For example if the roads were to be draped to the contour lines then the layers containing contour lines would be specified here.