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6.6 Regions

 

There is still another type of composite object that we can create with Autocad. It's about the regions. Regions are closed areas to which, due to their shape, physical properties are calculated, such as the center of gravity, so in some cases it will be convenient to use this type of objects instead of polylines or other objects.

You can create a region object from, for example, a closed polyline. However, they can also be created from the combination of polylines, lines, polygons and even splines, as long as they form closed areas in the same way. This versatility also allows us to create region objects using Boolean operations, ie adding or subtracting areas, or from the intersection of these. But let's look at this process in parts.

A region is always created from already drawn objects that form closed areas. Let's look at two examples, one of a polyline and one of simple objects clearly delineating an area.

The query of the physical properties of a region will be studied in the 26 chapter, meanwhile, we can mention that we can also create regions from enclosed areas using the “CONTOUR” command, although this command can also create polylines. Let's see the difference of one or the other.

We can also add two regions in a new one with the “UNION” command. Again, regions can start from polylines or other closed forms first.

The reverse Boolean operation is also valid, that is, to one region subtract another and obtain a new region as a result. This is achieved with the "DIFFERENCE" command.

The third Boolean operation is to intersect regions to obtain a new region. The command is "INTERSEC."

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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