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Drape Control (DraCon)
Type: Batch Application
Detailed Description
Drapes the x,y,z points in a control file to a point cloud or the active Digital Terrain Model (DTM) surface and creates a report that shows the elevation difference between each elevation in the control file and the computed elevation at the x,y position in the control file. This application does not modify any data but produces a report only. A point cloud surface may be LiDAR and (or) Digital Surface Model (DSM) data or any other x,y,z collection of VrPoints. If draping to a point cloud is selected then the application uses the Vr High/Low point searching to determine the elevation for each control point. Please see High/Low Point Search for more information on this method. If draping to the active DTM surface is selected then a DTM surface must be active. The Set DTM (SetDtm) command can be used to set DTM generation parameters and the surface may be generated using the Run DTM (RunDtm) command.
Following is an example of a Drape Control report. NOTE: The results at the bottom of this report are shown as an example only.
DRAPE CONTROL
using High/Mean/Low point searching
25-Jul-2016 00:41:58
Control file: K:\Jobs\ZAccur\GroundControl.cor
High/Low parameters
High/Low search : On
Search mode : Mean point
Initial buffer size : 1000
Adjust x,y : No
Classifications (blank=all) :
Search radius (ground) : 0.200
Z tolerance (ground) : 1.000
Z offset (ground) : 0.000
More information on the High/Low search parameters can be found at:
http://www.vrmapping.net/help5/high_low_point_search.htm
Name X Y Z CompZ DeltaZ
-------------------------------------------------------------------------------
440 6267198.873 2316066.683 417.870 417.873 +0.003
460 6267561.752 2316062.986 413.920 413.923 +0.003
388 6267644.065 2316087.418 412.530 412.533 +0.003
615 6267112.852 2315970.640 418.450 418.452 +0.002
656 6267867.186 2315963.621 409.450 409.452 +0.002
455 6267475.988 2316063.855 414.900 414.902 +0.002
437 6267140.343 2316067.178 418.440 418.442 +0.002
322 6267010.667 2316080.230 419.170 419.172 +0.002
394 6267744.428 2316088.858 411.130 411.132 +0.002
553 6267068.169 2315983.073 418.910 418.911 +0.001
566 6267314.495 2315980.832 416.900 416.901 +0.001
661 6267967.182 2315962.774 408.130 408.131 +0.001
470 6267748.353 2316061.176 411.460 411.460 +0.000
447 6267333.940 2316065.070 416.560 416.560 +0.000
573 6267434.840 2315979.632 415.610 415.610 -0.000
559 6267188.164 2315981.950 418.000 418.000 -0.000
610 6267030.396 2315971.420 418.980 418.980 -0.000
472 6267788.351 2316060.833 410.840 410.840 -0.000
452 6267431.936 2316064.183 415.450 415.449 -0.001
391 6267704.060 2316088.185 411.680 411.679 -0.001
386 6267604.068 2316086.906 413.060 413.059 -0.001
618 6267172.849 2315970.051 417.960 417.959 -0.001
654 6267827.187 2315963.960 410.060 410.059 -0.001
469 6267734.123 2316061.338 411.710 411.709 -0.001
392 6267704.434 2316088.190 411.680 411.679 -0.001
465 6267654.128 2316062.246 412.720 412.718 -0.002
Points draped : 204
Mean delta Z : +0.001
Minimum delta Z : -0.002
Maximum delta Z : +0.003
Root mean square : +0.002
Std deviation : +0.002
Parameters for Drape Control
The Drape Control main dialog
Coordinate file name
Defines the Vr coordinate file containing control points to be draped
Report file name
Output file name to place the resulting drape report.
Drape to
Defines the drape mode which is if the control points should be draped to the point cloud or to the active DTM surface. If draping to the active DTM surface is selected then a surface must be active and can be generated using the Run DTM (RunDtm) command.
Edit high/low point search
Defines the high/low point searching parameters to determine the point cloud elevation for each point in the control file. Please see High/Low Point Search for more information. The high/low point search parameters are used if the "Drape to" parameter is set to "Points".
Load parameters
Loads a previously saved parameter file. Drape Control parameter files use the .drc file extension.
Record parameters
Records the current parameters. Drape Control parameter files use the .drc file extension.
Reset parameters
Resets the Drape Control parameters to default values
Help
Displays this help page.
Available Key-ins
Key-in |
Description |
Range |
ParFil= |
Load parameter file |
Drape Control parameter file name (.drc) |
CooFil= |
Defines coordinate file |
Coordinate (.cor) file name |
RepFil= |
Defines report file |
Output file name (.txt) |
DraMod= |
Drape mode |
0 = Drape to point cloud (VrPoints) 1 = Drape to active DTM surface |
HL_OffOn= |
Turns on/off high, mean or low point searching |
0=Off 1=On |
HL_Mod= |
Specifies the search mode |
0=Low point 1=Mean point 2=High point |
HL_BufSiz= |
Initial buffer size |
Number of points |
HL_XyAdj= |
Copy XY of point found to current location |
0=No 1=Yes |
HL_SeaCla= |
Classifications to search |
0-31, Number line may be used |
HL_SeaRad= |
XY search radius |
Ground units |
HL_ZTol= |
Z tolerance above and below source point |
Ground units |
HL_ZOff= |
Offset to add to Z result |
Ground units |
Run |
Runs Drape Control |
Running Drape Control From a Macro
Since Drape Control supports key-ins, it is possible to run the application, unattended, from a Vr Macro. When running in this mode, dialog boxes other than the main dialog will not be displayed unless there is an error.
Following is an example of a Vr Macro that loads Drape Control (DraCon), sets the desired parameters then runs the application. When the application starts, previously saved parameters will be loaded. If some parameters are not set then the previous or default values will be used. Parameters that are set in this configuration are not saved when the application exits.
DraCon
CooFil=K:\Jobs\ZAccur\GroundControl.cor
RepFil=K:\Jobs\ZAccur\GroundControlReport.txt
DraMod=0
Hl_OffOn=1
HL_Mod=1
HL_XyAdj=0
HL_SeaRad=0.2
HL_ZTol=1.0
Run
July 2016- Drape Control added
August 2017 - Added drape to active DTM surface (05.09.03)