Hi Ramiro,
Yes, you can import ASCII files directly into SPDLib. You just need to define
an XML schema telling spdtranslate which data is in which column. There are
some examples here:
https://bitbucket.org/petebunting/spdlib/src/a341032e01e0/schemas/?at=default
<https://bitbucket.org/petebunting/spdlib/src/a341032e01e0/schemas/?at=default>
Thanks,
Dan
> On 2 Dec 2014, at 19:01, Ramiro Silveyra González <[email protected]> wrote:
>
> Hi everyone,
>
> My name is Ramiro and I am master student at Freiburg University. I am
> working on a master Thesis about forest stands and habitat mapping.
>
> I have several asc files which I want to convert to spf format, for later
> deriving elevation products and vegetation metrics. The files do not have
> header and contain 7 columns: x, y, z, width, intensity, return number and
> GPS time.
>
> I would appreciate if someone could give any advise and how I should proceed
> wiht it.
>
> So far I tried as first step to convert them to las format (txt2las) and from
> there to SPD.
> My problem is that no number of return of a single pulse (n) is provided. I
> want to add the information on n and I have been struggling for a while
> already.
> I worked the asc file with pandas to add n column, and tried to add n values
> with pandas before converting to las format. I also tried to add the values
> of n using laspy, creating a n array to replace num_returns. But I did not
> succeed and I fail to understand how should I proceed. First issue is that
> some pulses have more than 5 returns, even up to 9, which lastools cannot
> digest apparently. The second is that even when theoretically I calculate n
> right, I don't add the information properly to the las file because the
> return number and the number of returns don't match. For example, if I
> convert the las file to spd format I get such warning error: SPD translate is
> ignoring Points because return number is greater than number of Returns, or
> return number must be 1 and it is not.
>
> Would it be possible to skip the step of converting to las and convert the
> files straight away from asc to SPD format?
>
> If not, how do you think I should go about using lastools? Should I just do
> not try to add the number of returns?
>
> Sorry for sending such a long email and thanks in advance for your time.
>
> Best regards,
>
> Ramiro Silveyra
>
> M. Sc. Forest Sciences
> University of Freiburg
>
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