What do you do if a survey crew takes a lot of isolated patches of topo areas. Think, maybe, for quadrants of urban intersection corners - with no shots (and no intent) to connect these "terrain islands".
Out of the box (fieldbook) it will want to create a single terrain from all the points. Max triangle length can help trim out bad triangles, but still remnants of nastiness.
Another example is widened exteriors in corridors.
Is there an easy/automated way to get individual terrains for each island which can then be added and managed in a Complex Terrain? Complex Terrains work nicely with a base terrain that surrounds all the islands...
Graphic filter with fences/selection sets for semi-automated creating of individual terrains is a semi-automatic solution. Is there better?
Asking for a group of friends...
-jeff
Hello,
Y can provide you the procedures I follow for that.
For a surveyor should not be an issue to provide you separate models for each patch.
If surveyors provide you with a monolithic finished model ( any kind of DTM), I load it and create trim terrains for each via individual poligonal fences. Is quite fast, and usually brings no issues.
If they provide only the graphical components (points, breaklines, etc ...), then create individual terrains for each patch. One graphic filter will do the trick.
Of course, I create each model in individual files and reference them in a federated model.
If you need that a corridor interact with some of them, the procedure I use is defining each one as a target aliasing, so you can easily update or replace the different patch if needed (different execution phases over time, for example), without the mess of upgrading or recreating a complex model every time.
Best regards.
hey, thanks. The Graphic Filter requires the graphics to be in separate dgn's, yes? There is no selection set or fence option (or is there)?