Plot line with points at given distance

Question

Ricco Blass 2022-2-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1653160-plot-line-with-points-at-given-distance

评论： Ricco Blass 2022-2-26

采纳的回答： Wolfgang Schwanghart

Facet1.mat

在 MATLAB Online 中打开

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.

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Voss 2022-2-18

Ah, I see. I thought all the toolboxes were available here, so that's good to know.

Ricco Blass 2022-2-19

Yes I updated my question. Should have mentioned that before.

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Answer 1

Wolfgang Schwanghart 2022-2-25

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1653160-plot-line-with-points-at-given-distance#answer_904730

在 MATLAB Online 中打开

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