Hybrid parallel

[SLW210]

Hopefully I will have free time after this week to play with this topic again.

 

 

[GLAVCVS]

On 1/30/2026 at 1:28 PM, SLW210 said:

 

I did see a for-purchase program that used a raster image and maybe worked with QGIS, I'll see if I can find it again, the demo video looked pretty good and even split around islands, side branches, etc.. It had a lot of parameters to fill out in a window for what to grab, so still a good bit of work, IIRC.

 

 

 

I'd also like to know what other, more specialized programs can do about this.
I'll be following any news on this closely.

[SLW210]

Creating river center-lines with WhiteboxTools

[SLW210]

I also found a new plug-in for QGIS. I will try to put in some home time on this when I can.

 

BecaGIS — QGIS Python Plugins Repository

 

Early on in this thread I posted some links as well.

 

Looking at the work to create these in other CAD/GIS software, it looks like AutoCAD and LISP is the closest to automatic so far, not sure yet how accurate some of the other software and methods can get.

[PGia]

17 hours ago, SLW210 said:

Creating river center-lines with WhiteboxTools

 

That's interesting.

Although the starting points seem to be different: pixels vs. vectors.

In any case, it would be interesting to test the geometric robustness of that central line. That is, what it can return in some of the more challenging vector examples we've tested here.

[SLW210]

It will probably be next week before I can check out QGIS solutions.

 

From the user's perspective, even if off in a few spots, several of these LISP solutions here are faster (maybe more accurate), even including time to adjust manually than most of the other solutions for GIS, though I am no speed demon in GIS.

 

Just look at all of the prep work on the Whitebox Tools, though if I had all of those branches and islands as well as a few oxbows, thin connections, etc. like the example, that would be the way to go as far as I can tell, I do believe it also works on vector, IIRC.

 

It looks like part of that is free as a Python toolset, I'll try to read up some more on that.

 

As I mentioned long ago in this thread, my daughter's co-workers are using AutoCAD to create the centerlines and manually adjusting if needed even though they have ArcGIS, though they may not have the extra tools that have the easy centerline tools. From what I looked up, ArcGIS made some tools a higher priced tier.

 

Maybe asking a few questions on some GIS forums might yield more information.