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Analyze and fix Z elevation trends in 3d polylines
Command
line: GT_ZTREND
The GT_ZTREND command
is used to analyze and fix (or set) Z elevation trends in 3d polylines.
In
many 3d mapping situations, it is often necessary to ensure that digitized
3d polylines have consistently Upwards or Downwards flowing
vertex elevations. The GT_ZTREND command helps to check and ensure this.
In many instances of surveyed data, the elevation flow may temporarily be
reversed within a tolerance. The command can also identify such
within-tolerance reversals and fix the data
Elevation flow must be:
Upwards (increasing values): Checks if the polyline vertex is
moving downwards consistently.
Downwards (decreasing values): Checks if the polyline vertex is
moving downwards consistently.
Elevation reversal tolerance: Enter the tolerance within which the
reversal should take place.
Include closed polylines also?: Check this button to include
processing of closed polylines also.
Automatically correct elevation if within tolerance: Checking this
button causes the program to automatically correct polyline elevations
when the variation is within tolerance.
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Überstände in gewählten Abschnitten abschneiden
Command
line: GT_OVERLAP
The GT_OVERLAP command is used for removing overlapping
line segments. This is a very powerful tool to quickly clean large number
of overlapping segments. This command removes overlapping segments either
if it is completely Overlapping from end to end or Partially overlapping
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Doppelte Objekte löschen
Command
line: GT_DELDUP
This command deletes duplicate entities from an AutoCAD drawing. This is a very powerful tool to quickly clean AutoCAD drawings that have redundant duplicate data. Entities which are geometric duplicates, either exact or within a specified tolerance can be identified and removed. Duplicate check can be performed by taking into consideration their extended entity data or layer criteria as well.
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Textzeichen ohne Inhalt löschen
Command
line: GT_NULLTEXT
Often, various aborted DIMENSION and TEXT commands result in the formation of null text objects which cannot be seen but are present in the drawing and affect operations like ZOOM EXTENTS. They also increase the drawing size unnecessarily. The
GT_NULLTEXT command gets rid of all such "ghost" text objects.
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Bereinigen aller nicht verwendeten Symbole
Command
line: GT_PALL
Purges all unreferenced symbols without the confirmation question "Yes/No". Use this command only if you are sure that you do not want ANY unreferenced symbol in your drawing. This is a handy tools to get rid of all unnecessary symbols and reduce drawing space.
Note: GT_PALL command is by default not enabled, for making
it enable type GT_Defmacros at the command prompt.
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Linear & Knoten-Fangmodus
Command
line: GT_NODELINESNAP
The GT_NODELINESNAP command replaces the earlier MAGNET command is used to perform automatic drawing cleanup of linear
segments and point [node] objects. This command fixes undershoot and overshoot errors in
lineworks, allows for snapping of points in lines, polylines, arcs etc to
nearby linear or point features. Point work cleanup also can be performed
and by this technique, points can be snapped to other points or lines in
the vicinity. Typically, a map data resulting from a manual digitization or raw GPS or surveyed data will have many of these kinds of errors, which can be easily fixed with the MAGNET command.
GT_NODELINESNAP automatically "looks" at the nodes of linear features and snaps them to nearby linear or point features.
Linear features include AutoCAD lines, polylines, arcs or spline objects.
Point or Node objects include AutoCAD Point, Insert [ Blocks] and Shape
objects.
The command works equally well with both 2D and 3D objects. In case of a 3D object like a 3D polyline vertex, the snapping can be performed in either X, Y directions retaining existing elevation (Z) value or it can inherit the elevation (Z) from the neighboring object. Applying two tolerances
[NEArest and ENDpoint] around the ends of the linear features searches the neighboring object.
For node objects, the distance to search around the point is specified by
the NODe tolerance.
A dialog box pops up and displays the parameters to set for this operation.
Snap Type: Specify the type of snapping to be applied.
Line2Line: Snaps linear objects to other linear objects only
Line2Node: Snaps linear objects to other point objects only
Node2Line: Snaps point objects to other point objects only
Node2Node: Snaps point objects to other point objects only
Snap criteria for Line2Line / Line2Node:
Additional snap criteria for Line2Line and Line2Node snap modes
determine which vertices to apply the snap.
All vertices: Applies snap to all vertices of selected lines,
polylines, splines etc.
First and Last only: Applies snap to only the first and last vertex
only. Useful for linework cleanup where only end snapping is required.
Snap Mode: Defines another mode of snap operation
XY Only: Snapping is done only in the X and Y directions
[two-dimensional direction] only. The source Z value is retained and
transferred to the target point.
XYZ Only: Snapping is done in the X, Y and Z directions. The new
elevation Z value is obtained from the target point.
Other parameters: Specify other snap parameters
END search tolerance: This is the distance to search around the
vertices for the ENDs of an AutoCAD object segment as returned by the Osnap Endpoint mode. This tolerance is measured horizontally.
Applies to Line2Line and Node2Line Snap Modes.
NEArest search tolerance: This is the distance to search around the
ENDs of an AutoCAD object segment for the NEArest AutoCAD object segment as returned by the Osnap Nearest mode. This tolerance is measured horizontally.
Applies to Line2Line and Node2Line Snap Modes.
NODe search tolerance: This is the distance to search around the
point for the existence of a NODe or an INSert object. This tolerance is measured horizontally.
Applies to Line2Node and Node2Node Snap Modes. This snap
mode snaps only to points, inserts and shape objects. For points, the NODe
Osnap mode is applied and for Inserts and Shapes, the INSert Osnap mode is
applied.
Z search tolerance: Source and target points whose elevation difference is lesser than this amount will
only be snapped. This tolerance is provided to prevent a very high
elevation difference from being snapped.
Snap to objects within current selection only: Checking this option
causes the snap to be successful ONLY if the target point falls on an
object which belongs to the initial selection. Use this option when you
want to snap within the selection only. For example, you may have a
network or minor roads and major roads and you want only the major roads
to snap to themselves. You can achieve this by checking this option and
selecting only the major roads for you snap operation.
Command Operation:
The GT_NODELINESNAP command works under two main modes of operation - Linear
Snap and Node Snap.
In Linear Snap, source objects snap on to linear objects like
lines, polylines, arcs, splines etc. The source objects themselves can be
linear (Line2Line mode) or nodes (Node2Line mode).
In Node snap, objects snap on to node objects like points, blocks
and shapes. The source objects can be linear (Line2Node mode) or
nodes (Node2Node mode).
In Linear Snap, two tolerances are applied in the following order -
first a NEArest tolerance is applied to determine the nearest point on a
vicinity object. If no NEArest point is found within the specified NEArest
tolerance, an ENDpoint is searched for on a vicinity object. If it
succeeds, the point is snapped and updated. If it succeeds, the point is
snapped and updated. If no ENDpoint is found within the specified ENDpoint
tolerance, no snapping takes place. If the snap mode is XY only, the point is moved horizontally
and the original elevation is maintained. If the snap mode is XYZ, the point acquires the target Z value if the elevation difference is within the Z tolerance.
Otherwise, no snapping takes place.
In Node Snap, only one tolerance is used - NODe tolerance. This is
applied around the point in consideration and it looks for a nearby point,
block or shape insertion point. If one is found within the NODe tolerance,
the snap is successful. As with LineSnap, the Z tolerance check is applied
here also.
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Schneidende Abschnitte in Polylinien herausfinden
Command
line: GT_KINK
The KINK command detects and highlights kinks in Polylinies. Now, what is a kink? A kink is a "knot" or a "back
twist". In Polylinies, any segment which intersects other segments in the same Polylinies causes a kink. The KINK command
helps identify these intersection points so that remedial action can be taken. The kink can then be removed with the Pedit
or GeoTools Express Pedit command XV. The kink intersection is highlighted as point objects in
a temporary layer.
Note: Polylinies which have kinks will fail when used as selection boundaries in the ESELECT command.
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Kreuzende Objekte an Enden der Polylinie
abbrechen
Command
line: GT_BREAKX
The GT_BREAKX command breaks Polylinies and lines located at the ends of selected
lines and Polylinies. This command is similar to the AutoCAD Map drawing cleanup
command Break Crossing Objects but often handles most of those cases that
could not be processed by the AutoCAD Map cleanup command.
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Linienschnittpunkte bearbeiten
Command
line: GT_INTEX
The GT_INTEX command is useful in
processing a network of intersecting polylines. Using this command, intersecting
polylines can be broken at their intersections or just have a vertex added at
the intersecting points. Further, two selection sets can be established
- a source selection set and a target selection set and one can be made to
operate upon the other. This provides a means to filter objects used for
processing.
Important note: The GT_INTEX command works only with polyline objects.
These can be either light-weight or heavy- weight polylines and they can
be 2d or 3d polylines. They must contain only linear segments and must
not be splined, fitted or contain arc segments. If you have source objects
that intersect with target objects that are 3d polylines, make sure that your
source objects are defined as 3d polylines if you want the intersecting points
to acquire correct interpolated 3d elevations at the intersecting points.
The following commands in
GeoTools may be useful in preparing correct data for use by the GT_INTEX
command. GT_CH3D2D, GT_CH2D3D,
GT_PLARC2PL, GT_PL_STAT,
GT_SET_Z_PL.
Object Break Options:
Specify the options that control how source
and target polyline objects should be broken at their intersection points.
Source Objects Only:
Breaks only source polyline objects at their
intersection with target polyline objects
Target (crossing) Objects Only: Breaks only target polyline objects at
their intersection with source polyline objects
Both Source and Target Objects: Breaks both source and target polyline
objects at their intersection with each other
None: No breaking is done. Only vertices are added according to the
settings in Vertex Add Options.
Vertex Add Options: Specify
the options that control how new vertices should be added to the source and
target polyline objects.
Source Objects Only: Adds new vertices only to source polyline objects where
they intersect with target polyline objects.
Target (crossing) Objects Only: Adds new vertices only to target polyline
objects where they intersect with source polyline objects.
Both Source and Target Objects: Adds new vertices to both source and target
polyline objects where they intersect with each other.
None: No vertices are added either to source or target polyline
objects.
Source Objects: Select this
button to bring up the selection set builder dialog box and select source
polyline objects
Target Objects: Select this
button to bring up the selection set builder dialog box and select target
polyline objects
Target Selection conditions:
Specify the method of defining target objects. Target objects are
those which are operated upon by source objects.
Same as source objects: Checking
this option causes the source object selection to be the same as target
object selection. This means that intersections will be checked within one
single selection set [ source selection ] itself. Any objects that cross
the source objects and which is not in the source selection set will be
ignored.
Select manually: Allows to
manually specify the target selection set by screen pick. Source objects will be
checked for intersections only within this selection set.
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Freie Ende (dangles) von Linien, Polylinien und Bogen finden
Command
line: GT_DANGLECHECK
The
GT_DANGLECHECK command is useful to detect free standing ends of polylines,
lines, arcs and splines, also known as dangling ends. A user-defined
search window tolerance is applied around the ends and if there is no
other object in the vicinity, the end is treated as a free standing end or
a dangle. All such end points are marked with POINT objects in the
GeoTools temporary layer "GEOTOOLS_TEMP" so that they can be
easily checked.
Search
Window Size around endpoints:
Enter the value for search window around the objects endpoints.
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Tools Unbezogene Eintragungen entfernen oder beseitigen von dem 'ScaleListEdit' Befehl
 Command
line : GT_SCALECLEAN
The GT_SCALECLEAN command removes all un-referenced scales): There is a bug in AutoCAD which causes the SCAELLISTEDIT command to keep displaying all scales from any external reference that was once attached to the current drawing, even after they are detached and gone. The GT_SCALECLEAN command helps to get rid of all these un-referenced scales by removing the entires from the AutoCAD dictionary.
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Ausgewählte Image-files scannen lassen und Image-grenze List bilden lassen
Command
line : GT_BINDXREF
This is a cleanup tool that performs a most commonly needed requirement of CAD users before packing their drawings off to outside agencies - remove all unresolved external references and bind all valid attached xrefs.
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Rechtwinkel erzeugen die Ränder von digitalisierten Gebäuden entlang
Command
line : GT_HSQUARE
The
GT_SQUARE command is a building squaring tool. It adjusts the angles of a
polyline such that they form an exact right angle between adjacent
segments. You can set an angle tolerance value to determine segments that
should be adjusted. This tool is useful for fixing building edges
(captured from satellite imagery) which are skewed because of camera or
terrain tilt.
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Punkte abseitigen auf Basis des Abstands
Command
line : GT_POINTWEED
The
GT_POINTWEED command removes AutoCAD points (or blocks) which are closer
to each other by a user-specified distance.
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Enden von linearen Objekten kontrollieren mit entsprechenden XY aber mit varierenden Z Werten
Command
line : GT_ENDELEVCHECK
The
GT_ENDELEVCHECK command is used to check the two end points of linear
objects like lines, polylines, splines and arcs to see if there are other
linear objects whose either end-point is at the same XY but different Z
location. Optionally, a vertical line can be drawn connecting the two
coincident points.
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Stützpunkt mit Nullhöhe auf Höhe des nächsten Wertes
setzen
Command
line:
GT_SET_Z_PL
Often, you may have Polylinies in which some vertices have a zero [0.0]
elevation while others have non-zero elevations. This command sets the Z values
of those zero elevation vertices to the nearest non-zero vertex elevation value.
The command scans through the Polylinie and seeks a non-zero value nearest to it
and assigns it to the vertex. Thus, at the end of the command run, there will
not be any Polylinie vertices, which are of 0.0 elevation. Therefore, this
command is best used when you are sure that there should not be any legal vertex
elevation of 0.0 anywhere along the Polylinie. If the elevation of the first
point is zero, then the elevation of the next suitable vertex is taken.
GT_SET_Z_PL Tutorial
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Make polylines / 3dfaces planar
Command
line: GT_PLANARPOLY
The GT_PLANARPOLY command is used to make a polyline or 3dface
planar. A planar polyline or 3dface is one in which all the vertices can
be placed on a single plane. Generally, this is possible only if all the
vertices have the same elevation or, in the special case of a 4-vertex
polyline, the polyline can be considered planar if two pairs of adjacent
vertices have the same elevation. The GT_PLANARPOLY command makes this
happen by setting the elevations of adjacent vertices same if they are
within a specified tolerance. The need to create perfectly planar
polylines or 3dfaces is often required and useful in photogrammetry data
capture and rendering applications.
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