•Assigns the Coordinatestraverse view format. If the imported points have geodetic data, use the GPS3D format.
•Assigns supported LandXML attributes (state, max and min elevations, etc). These correlate directly with LandXML data values and will be included in any LandXML export of surfaces
•Inserts the LandXML points, faces breaklines, border edges, etc into the surface
Import Details
If you turn on the [x] Details option when you import LandXML surfaces, TPC will add information about the surface imported like in the following sample:
[ Reading surfaces... ]
EG
Existing Ground of Quary
MinZ: 230.00 MaxZ: 290.00
Plan Area: 9742293.95, Surface Area: 9752293.970, Points: 713, Faces: 1284
Exporting
Surfaces that are exported to LandXML include the points, faces, breaklines and border edges used by the surface in TPC.
Editing Surfaces
When you import a LandXML surface into TPC, or when you create your own surface in TPC, you can right-click that surface in the Surfaces Manager and choose Surface Properties.
Surface Points
When TPC imports a LandXML surface, it prepends DTM to the point label. So point 1 becomes DTM1 and so on. These surface points are currently added to the survey points, so the DTM prefix helps identify the imported surface points.
If an imported LandXML surface point (p) contains an id attribute, TPC uses it for the point label. So id=1 becomes point DTM1 and so on. If an imported LandXML surface point does not have an id but does have a name, TPC uses the name. So a point with the name 100 becomes DTM100 in TPC. If a LandXML surface point has neither an id nor a name, TPC just the next available point label to it.
TPC also creates a source traverse and appends the surface points to it. TPC uses source traverses to know which topo points go with which surface.
When you write a LandXML file, TPC looks at each surface to see if it was imported from a LandXML or CAD file. If it was, TPC doesn't include the surface points in the CgPoints section of the LandXML file. Instead, each surface TPC writes to a LandXML file defines it's own points.
Breaklines
TPC's breaklines correlate directly with LandXMLs. TPC breaklines are listed in the Breaklines tab of the Surface Properties dialog.
Borders
TPC's surface borders correlate directly with LandXML's.
Invisible Faces (triangles)
TPC supports invisible triangles (faces) when importing and exporting LandXML's surfaces.
Invisible triangles can be used to create the same TIN created by adding a border traverse that defines the same configuration.
