[GRASS-user] Using GRASS on a ply file

[marion-brunet]

<span style="font-family:arial,helvetica,sans-serif; font-size:12px">‌Hello,</span><br>
<br>
<span style="font-size:12px"><span style="font-family:arial,helvetica,sans-serif">I have two point clouds of an open-pit mine taken a few weeks apart. I would like to estimate the volume that has been excavated during that interval, i.e the difference between the two point clouds. For that I used CloudCompare to get a new point cloud corresponding to the distance between the first two clouds. Now I need to know the </span></span><br>
<span style="font-family:arial,helvetica,sans-serif; font-size:12px">Z information of each point of this last cloud. I want to use GRASS to do it, but I can't find a method that is working...<br>
<br>
The first method I was suggested is to use<strong> v.in.ply</strong> and then<strong> r.report</strong>, but I have several issues:<br>
- When I use <strong>v.in.ply</strong> I have this error: <strong>ERROR: Wrong number of properties</strong>. Is it a common error? How can I solve it? I have attached a part of my .ply file to this email so you can see how it  is formatted.<br>
- After importing my .ply file, I would like to use something like <strong>r.report </strong>to get the value of each point. However, I don't know how to convert my file into a format that this command will work with... Could you help me?<br>
<br>
The second method I read about is <strong>r.in.xyz</strong>, but I don't know how it works, or what format of input I should use. Can I have more information about it?<br>
<br>
Finally, it is the first time I am using GRASS, so I am not comfortable with all its functionalities. If you have the time, could you explain your answers step by step? It would be really kind.<br>
<br>
<br>
Best,<br>
Marion</span>
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