[gdal-dev] Fw: [Liblas-devel] about las2txt and las2tin

[Riki Tiki]

hi, i know this should not be sent to this forum... but i got no reply from liblas-devel... i thought maybe you could at least point me the good forum, where i could get some reply to this problem, thanks a lot!!! riki


-----Original Message-----
From: Riki Tiki <mongoose_riki at mail.ru>
To: liblas-devel at lists.osgeo.org
Date: Tue, 23 Feb 2010 22:21:37 +0300
Subject: [Liblas-devel] about las2txt and las2tin

>  Hi,
> 
>  I have used above two tools. Thanks a lot for those in advance.
>  I did the following:
>  1) las2txt -i a.las -o coordinates.txt -parse xyz
>  2) las2tin -i a.las -o triangles.txt
> 
>  My questions are as follows:
>  1) Do all the points in coordinates.txt should be appearing in triangles.txt?
>  I.e. for example if in coordinates.txt I have the following:
>  x0 y0 z0
>  x1 y1 z1
>  x2 y2 z2
>  ...
>  x100 y100 z100
> 
>  Where x0,y0,z0,...,z100 are floats. So I assume that in triangles.txt I will only see numbers
>  between 0 and 100 inclusive. Am I right on this? Also can I be 100% sure that all the numbers
>  between 0 and 100 will appear in triangles.txt at least in one triangle?
> 
>  2) For example currently I have downloaded the following "http://liblas.org/samples/mscst000131.las" las file... I converted it using your tools above into coordinates.txt and triangles.txt, respectively as it is shown exactly above.
> 
>  But then I run a program which consists of the following code:
> 
>  //program written in c#
>  string[] triangles = File.ReadAllLines("triangles.txt");
>  string[] coordinates = File.ReadAllLines("coordinates.txt");
>  long counter;
> 
>  for(long i=0; i<coordinates.Length; i++)
>  {
>   counter = 0;
>   for(long j=0; j<triangles.Length; j++)
>   {
>    string[] str = triangles[j].Trim().Split(' ');
>    if((long.Parse(str[0]==i))||((long.Parse(str[1]==i))||((long.Parse(str[2]==i)))
>    {
>     counter++;
>    }
>   }
>   Console.WriteLine("Line: "+i+", found "+counter+"times.");
>  }
> 
>  Some of the lines are found to be 0 times. It means that not all of the coordinates appear in tins created? Am I doing something wrong? Or is it normal that some of them do not appear in tins generated?
> 
>  Thanks a lot in advance!
> Riki
> 
> 
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