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Discussion: karttapullautin for contours only?

in: Orienteering; General

Sep 2, 2020 11:00 PM # 
Pink Socks:
Perhaps this is a dumb question, but I'll ask anyway....

I have some point cloud files covering a much larger area than I usually look at. Instead of running the entire KP process, I'd just like to run the contour generation part (which would give me the DXF files that I can import in OOM). Is this possible?

I don't need the vegetation steps (I already know that it's 100% rough open).

I don't want KP to bog down in the cliff detection steps (the tiles have some GIANT 300m cliffs just outside the area that I care about).

However, I would like to play around with smoothness, curviness, and formline variables.

Can KP accommodate this? Perhaps I'm using the wrong tool?

Sep 2, 2020 11:30 PM # 
There may be a command line flag for contours only, but I haven't seen it documented anywhere. There are flags for just re-running the veg processing. On the other hand, the terminal output lets you know where the process is, so once you are past the contour generation stages, you could Ctrl-C out of the program and then just go fetch the DXF files. Certainly an inelegant solution, but should work.
Sep 3, 2020 1:18 AM # 
@cmorse - it does work, I am doing it when I want 5 m contours in the out2.dxf file, but where the vegetation is then wrong, and then run it again for 2.5 m in the out2.dxf to get all other files in the temp folder. Granted, not elegant.
I have tried #commenting all vegetation calculations in the ini file, but was not confident enough to have done everything right
Sep 3, 2020 2:33 AM # 
could you write an additional script that looks for the completed file and when found sends a kill command to the terminal?
Sep 3, 2020 8:13 AM # 
One workaround could be dropping all except ground points from your input laz files with las2las. And setting cliff thinng close to zero. It would still go through vegetation and cliff steps, but reasonably fast.

Note, for mapping you can make raw contours of any interval, just set the interval you want to basemapinterval ini parameter. Those normal KP contours aren't intended for mapping really, for ampping you usually need far smaller interval. I usually use 0.625
Sep 3, 2020 9:37 AM # 
You just want the contour detail and you have .laz or .las files?
This is a time where OCAD will probably be a better and much simpler process than KP. I'd say definitely simpler but I always just want the contour detail so I've never used KP so I can't make a valid comparison.
By using the OCAD DEM Import Wizard you can get the contours with a variety of intervals for form lines, contours and index contours. No problem OCAD does all that file conversion stuff for you. You can also choose raw or smoothed contours and the smoothed ones are still pretty detailed.
Sep 3, 2020 10:17 AM # 
Gordhun, mapant no group requested to do some comparison maps after 0cad based mapant ch was publshed, so here you can find some comparisons and dicussion:

Like I wrote there I believe comparisons are not entirely fair because part of the difference is generalization goal and the type of compromises they each group decided to make along the way.
Sep 3, 2020 10:59 AM # 
Gordhun, I now live in impression you need to make about 1.5 m contours with ocad to get about the same level of details captured as KP 5m + formlines when you map detailed hilltops with plenty of knolls and such. But nothing wrong there really, 0cad is mapping tool and doesn't even try to makes any interpretation on its own, for mapping it's just better to have more raw contours without any AI guessing how one might want to map something.

This discussion thread is closed.