[Liblas-devel] estimating lines and samples

[David Burken]

Thanks Tisham,

I believe it's just return intensity.  Hunting docs from supplier.  I 
see they've tagged the utm projection scale as one meter.  Just taking 
the bounding box on one sample it's 1956x2000=3,912,000 sq. meters and 
there are 2,502,079 points for first return.  So I'm thinking one meter 
will be way to small (have holes).  I'll play with it.

Thanks again,
Dave


On 02/08/2011 08:15 AM, Tisham wrote:
> Hi David,
>
> Is this a gridded terrain image i.e. an interpolated terrain from the 
> unevenly sampled lidar ? or is this a representation of the return 
> intensity ? I would recommend tin generation and gridding follwed by 
> some rough statistics on deviation from actual ground point values.
>
> For the interpolated intensity I am not sure what would be the best test.
>
> Cheers,
>
> Tisham.
>
> On 8/02/2011 5:11 AM, David Burken wrote:
>> All,
>>
>> I'm writing a plugin for ossim to form an image from las files.  This 
>> will be open sourced as soon as it's useful.  Does anyone have any 
>> advise on how to choose a grid resolution which will determine the 
>> lines and samples?  I thought about using the square root of the 
>> number of points for a return and then scaling by ratio of the 
>> bounding box.  It would be nice to pick a grid size that gets at 
>> least one point for grid.  Any ideas?
>>
>> Thanks in advance,
>> Dave
>>
>>
>> _______________________________________________
>> Liblas-devel mailing list
>> Liblas-devel at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/liblas-devel
>
> _______________________________________________
> Liblas-devel mailing list
> Liblas-devel at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/liblas-devel
>