Good Morning All,
I have a two DEM tifs that I imported into the Data Acquisition app. What I want to do is crop or trim the size of the surfaces and then merge them together and export to an InRoads DTM. I tried to place a shape, block, line string to try to clip the surface to and I keep getting the message "No Linear Selection". What the heck does that mean? I've been playing with this for some time and feeling a bit frustrated....
TIA
Chuck
Hi Chuck,
The clipping option requires that the User has already selected a clipping shape. The message is telling you that it cannot find the selected shape.
Given the info above, the process would be:
1) Create surface 1 from DEM.
2) Place MicroStation Shape over area of interest in Surface 1.
3) Select the Shape and right click on Surface 1 name and Clip by Polygon External (to remove all triangles outside of the shape - keep the triangles inside the shape).
4) Repeat Steps 1-3 for the second DEM surface.
5) Create new "empty Surface".
6) Right Click on "empty surface" and "Append from Surface 1"
7) Right Click on "empty surface" and "Append from Surface 2". Note: If surface 1 and 2 overlap in some area, they can be merged. If they DO NOT overlap, they must be Appened.
8) Right Click on "empty surface" and Export to InRoads.
HTHs
Michael,
Thanks for the response.
The surfaces I am using are quite large since they are DEM tif files and cover a very large area. Clipping the surfaces ends up causing the application to crash, I am assuming due to the size. I may try again again later.
Thanks again.
thats possible - any chance we can grab your data and try it here??
We'd surely like to know if we are hitting limits.
Thanks,
UPDATE:
I coordinated with Michael offline through PM and provided the dataset.
The long and short is the DEM tiffs had over a million points and made for long processing. I filtered the points to the default number and I was then able to clip two DEM surfaces and append them to one combined surface. I was then able to export the surface to an InRoads native DTM file.
The entire workflow didn't take all that long and it made for easy surface creation. All in all I think the surface part of data aquisition is pretty freaking cool and I'll definitley us it again for this application.
Thanks again for your help.