Microstation-BentleyLand survey

Create a digital model TIN with Bentley Site

Bentley Site is one of the tools within the package known as Bentley Civil (Geopak). We are going to see in this case how to create a terrain model based on an existing 3D map.

1. The data

I am using a XNUMXD file, which contains a triangulated model in which each object is a 3Dface, which Microstation calls shapes.

tin model on microstation site

2. Management of the .gsf project

Create project

The .gsf files (Geopak site file) store the information of the different Geopak applications and are a kind of binary database. To create one, do the following:

Site moedeler > Project Wizzard > Create new project > Next > name it “terreno san ignacio.gsf” > Next

Then the project bar appears, we choose:

Project> Save

Open project

Site modeler > Project Wizzard > Open existing project > Browse

And we look for the newly created project and select Open.

3. Store objects in the .gsf

Now we require that the .gsf contain the information of the map, for this we must tell it what kind of objects they are.

Create new model

New Site model > we assign the name to the model “dtm san ignacio” > ok.

tin model on microstation site

Store graphics

Site modeller > project wizzard > Import 3D graphics

In the panel that appears, we assign the name of the object, in this case “Dtm”, we specify the characteristics of tolerance and type of objects, in this case as void. could have been selected contours In case of having the level curves, Break lines, boundaries, etc.

tin model on microstation site

tin model on microstation site Then with the button Select elements, we select all the objects in the view. In order not to complicate the selection, we use the block option and make a box around all the objects.

we press the button Apply, and in the lower panel the object counter appears in descending order, while it is entering the project.

Up to this point, Geopak understands that all those objects are a mesh of interconnected objects.


4. Export to TIN

Now what we require is that the created objects can be exported as a digital model (TIN), for this we do:

Export Model / Object

And in the panel we choose that what we will export will be only the object, and the type; it can be a binary or Land XML file. we choose type TIN File.

tin model on microstation site

We also define the name of the file and it is possible to establish a vertical offset. As we will send all the objects we do not choose a Boundary.

And there you have it, it's a matter of choosing how you want to see the TIN; with contour lines, every so often, view or in vector, we will see that in another post.

tin model on microstation site

Golgi Alvarez

Writer, researcher, specialist in Land Management Models. He has participated in the conceptualization and implementation of models such as: National Property Administration System SINAP in Honduras, Management Model of Joint Municipalities in Honduras, Integrated Cadastre-Registry Management Model in Nicaragua, Territory Administration System SAT in Colombia . Editor of the Geofumadas knowledge blog since 2007 and creator of the AulaGEO Academy that includes more than 100 courses on GIS - CAD - BIM - Digital Twins topics.

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