[pdal] How to read a text file

[Michael Rosen]

Thanks guys.


So, I'm looking at the Sithole-Vosselman "Filter Experiment" paper from
2004.  The data they provide is in text format and sadly, puts two points
on a line (first and last return, though they don't give return number nor
total number of returns).

data: http://www.itc.nl/isprswgIII-3/filtertest/

[X1 - First Return] - x coordinate (Easting)
[Y1 - First Return] - y coordinate (Northing)
[Z1 - First Return] - z coordinate (Height)
[I1 - First Return] - Intensity of returned pulse
[X2 - Last  Return] - x coordinate (Easting)
[Y2 - Last  Return] - y coordinate (Northing)
[Z2 - Last  Return] - z coordinate (Height)
[I2 - Last  Return] - Intensity of returned pulse


To move forward I can, of course, preprocess the file so that these read in
as two separate, unrelated, points.  However, a robustness test for PDAL
would be if I could make a pipeline that would read it in as presented.
Could someone comment on how feasible that is.

On Thu, Mar 23, 2017 at 7:15 PM, Howard Butler <howard at hobu.co> wrote:

>
> > On Mar 23, 2017, at 7:23 PM, Michael Rosen <michael.rosen at gmail.com>
> wrote:
> >
> > Suppose I wanted to pass a text file into PDAL:
> >
> > No header line, just a list of known fields.
>
> You need to add a header line at the moment. It would be straightforward
> to make a patch to add a header override option to the TextWriter.cpp code,
> but that hasn't been done so far.
>
> Howard
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