Plot line with points at given distance
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Ricco Blass
on 18 Feb 2022
Commented: Ricco Blass
on 26 Feb 2022
Hi all,
I need to find a way to plot markers along a line (river course; attached file) with a given distance, e.g. each 500m.
Is there a way to extract these values. The find function does not work in this situation since I only get an empty double column vector. I've used the TopoToolbox before, so the dataset is a STREAMobj which might be diffucult to read for one who hasn't the toolbox installed.
I tried to plot new points with spacing, but since the river is not smoothed and also should not be, point spacing starts and every new edge.
plot(Facet1)
hold on
spacing = 500;
plot(Facet1(1:spacing:end,1),'ro')
In advance thanks for your help.![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/902430/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/902430/image.png)
4 Comments
Voss
on 18 Feb 2022
Ah, I see. I thought all the toolboxes were available here, so that's good to know.
Accepted Answer
Wolfgang Schwanghart
on 25 Feb 2022
Since you are working with TopoToolbox, you might want to use the function getlocation. If you have a STREAMobj S, then you can retrieve points at a distance of 500 m as follows:
DEM = GRIDobj('srtm_bigtujunga30m_utm11.tif');
FD = FLOWobj(DEM);
S = STREAMobj(FD,'minarea',1000);
S = klargestconncomps(trunk(S));
[x,y,val] = getlocation(S,[0:500:max(S.distance)]);
plot(S)
hold on
plot(x,y,'ok','MarkerFaceColor',[.5 .5 .5])
axis image
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/907320/image.png)
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