GLOBAL MAPPER 14 PORTABLE
Basilio Jarvis
Can anybody advise if it is possible to create a 3D TIN rather than square grids? My clients specifically want a triangle grid. I've been using Virtual Surveyor to do this as they have a very good workflow but I'm sure it can also be done in GM.
The example above is just exporting some data from the National Elevation Dataset directly to LandXML. If you're creating your own, you can check the box to "Save TIN" when creating a surface and then export that TIN out to LandXML (Look at the check boxes I have selected).
This is a problem for us as well. We have to use Arcmap to create a TIN from a DEM right now. What global mapper is creating is NOT a TIN. TIN stands for triangulated irregular network. Key word there is irregular. If given a DEM, global mapper just spits out a REGULAR network of triangles, which is not very useful if the idea is to go to autocad with the TIN. The whole point of a TIN is to reduce the size of the data, adding triangles where more information is needed, and reducing triangles where slope is constant, and more triangles are not needed to accurately depict the surface. This is, for us as surveyors, one of the biggest issues with global mapper.
There is a method inside GM to create a simplified triangular mesh from any loaded terrain. You simply right-click on the terrain layer in the Control Center, then select the Layer -> Create Mesh Features from Terrain menu command to create a triangular mesh at a specified base resolution with simplification optionally provided.
I export as *.dem from global mapper and use that to build the surface. Make sure your projection matches the one used in C3D. Create the surface and add the dem to it instead of creating one from a dem.
Sanet,
Civil 3D has a little problem with DEM data. It uses the lower left of pixel instead of center. DEM is derivative data. Better to use the original LiDAR point cloud data.
Location? I'd try first to find state or county elevation data.
Dave
@Pointdump
Hi,
Thank you very much for the information you sent. I got the lidar data. The coordinate system of my cad drawing is NAD83 Georgia State Planes, West Zone, US Foot (GA83-WF). But when .laz is converted to .rcp through autocad recap and imported into civil 3d, it is displayed in a different place. (When importing to civil 3d, I also imported according to "use geographic location".)
please help.
Hi, @Pointdump
Thank you very much for the information you sent. I got the lidar data. The coordinate system of my cad drawing is NAD83 Georgia State Planes, West Zone, US Foot (GA83-WF). But when .laz is converted to .rcp through autocad recap and imported into civil 3d, it is displayed in a different place. (When importing to civil 3d, I also imported according to "use geographic location".)
please help.
Sanet,
What did "Current" and "Target" look like when you brought the point cloud into ReCap?
The LAZ file I grabbed was horizontal degree units and vertical Meters. ReCap read the header information as "LL-HPGN".
Dave
Sanet,
Horizontal transformation worked well on the LAZ file I grabbed. You'll need to check vertical units to see if they are OK.
Attached are drawing, ReCap files, and the original LAZ file. I filtered ground points in ReCap.
Dave
Civil 3D inserts the DEM the same way it inserts all rasters, i.e. the lower left of each pixel. However, if you add the DEM as an FDO connection, then it inserts properly. (It treats the raster as an entity, not as a collective bunch of pixels.) As long as the raster is a rectangle and not an IRREGULAR shaped image, such as one with zig-zag edged(s), an FDO will insert correctly.
When the area of interest is very big and the amount of data large, multiple Pix4Dmapper projects can be created for one area. To merge .tif files that are generated from the multiple projects, use an external GIS software like Global Mapper.
Pix4Dmapper can generate contour lines. For more information: Menu Process > Generate Contour Lines. However, it is also possible to extract contour lines using the DSM or DTM generated by Pix4Dmapper.
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