Manifold GISLand survey

Level contours with Manifold GIS

Testing what Manifold GIS does with digital models, I find that the toy does more than what we have seen so far for simple spatial management. I am going to use as an example the model that we created in the exercise of Streets with Civil 3D.

Import a digital model

In this Manifold is a powerful donkey, you can import from the common formats that store surface data, such as ESRI, ENVI, IDRISI, ERDAS, etc. Also of data contained in basic formats such as dbf, csv, txt.

Manifold gis dtmIn this case, I want to import a .dem generated with AutoDesk Civil 3D; for that I do:

File> import> surface

And voila, it creates a comment type component with the properties of the original file, such as projection, program with which it was created, etc. In the case of coordinate files, request the order in which they are entered and the type of numeric field.

If you want to work data inside a component, to convert it to surface, it is only done copy> paste as surface


Create contour lines

To create contour lines, you do the following:

Surface> contours

And here you can choose individual curves, or an incremental one, the first is placed and how many are added. In this case, I decide 191 and with an increment of 1.

Manifold gis dtm2

You can also choose whether to put the contour lines or also the area between them, at once they appear colored by the default theming of elevations. This is created as a component type drawing.

Create 3D View

To do this, the surface is created with a subcomponent called Terrain, This can be seen as 3D view, with the right button is chosen if you want overlay from other layers, flooded surface, texture, Wireframe And exaggerated elevation.

Manifold gis dtm3

To insert a profile, it is created as if you were going to make a component, choosing elevation. It requests the dependency surface and then the line can be modified by adding vertices.

Manifold gis dtm2


Not bad, if we consider this to be part of the extension Surface ToolsLike any GIS tool, theming is a luxury, simple to create surfaces, but it falls short in terms of practicality and other operations with the results. At least creating an isometric view with greater freedom took me a long time, it also affects that the objects it generates (curves, basins, areas between curves) are not an attribute of the layer, so when updating the model you have to generate them again.

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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