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Hi,
Is it possible to crop a grid surface that has been created from .tif DEM file? I have a dwg that has one surface in it, named EGL. I didn't create the surface but believe it was created by right clicking Surface in prospector tab > Create Surface > Select Grid as surface type > Add DEM file. The current surface style only displays the surface border. The DEM has 38million points spread across a mountain that's being developed.
Future drone survey's will likely be used to update EGL. Therefore, I would like to crop three sections of this surface representing different stages of the project to be used by multiple people for simultaneous design. I have three closed 2D polylines at 0 elevation representing each stage. The Create Cropped Surface dialogue box has the surface type greyed out and only TIN surface is available as the surface type that I'm able to create which I'm not overly worried about but any comment here is welcome too. I'm experiencing two issues:
1) I select EGL > Extract From Surface>Create Cropped Surface>click Selection Method>Select Object on the command line. It cancels the command and the Create Cropped Surface dialogue box re-opens.
2) If I follow the same steps but draw a polygon rather than trying to select one of the polylines as an object, it allows me to create the cropped area and and click the OK button to create the cropped surface in a separate drawing called EGL-Cropped Stages. When I open EGL-Cropped Stages, the prospector shows a TIN surface has been created but the Properties>Definitions Tab is empty and no surface appears.
To get around this I've recreated EGL as a TIN surface and added a data clip boundary which encompasses all three stages, then added the DEM file. Then cropped from this successfully. Wondering if anyone has experienced the issues above or has any comments regarding advantages of cropping from a surface created as a grid surface or a TIN surface. I have attached the dwg but the tif file is too big.
Any comments would be appreciated.
Cheers,
Solved! Go to Solution.