Hi Pete,
If I have a LAS-file with messed up order, wouldn't it be possible to sort the
LAS-file by GPS-time and then do the pulse-rebuild?
Cheers,
Mattias
From: Pete Bunting [mailto:[email protected]]
Sent: den 14 augusti 2013 13:09
To: Roberto Antolín
Cc: [email protected]
Subject: Re: [spdlib-develop] spdtranslate WARNING: Pulse was written as
incompleted pulse
Hi Roberto,
This was a feature I added in May. It is about rebuilding pulses from the LAS
file. The assumption is that a LAS file is in time order and/or at least that
if a point states that it is point 1 or 3 then then next three will be 2 or 3
and 3 of 3 etc. Basically, I ran into problems as I got delivered a file where
this had been broken and when SPDLib was building pulses it was getting some
crazy results as it just read point 1 of 3 and then read the next 3 points and
build a pulse rather than checking the numberings of the those pulses.
Therefore, I introduce an extra 2 LAS readers. Where the LAS reader is
specified the behaviour is largely the same as before but where it finds a
pulse which doesn't make sense then it outputs the warning you are seeing but
still writes the pulse to the output SPD file - fixing the pulse so it is
consistent SPD Pulse in the process. LASNP does not try to build pulses and
just stores each point within a separate pulse - which is an overhead but will
always work however messed up a LAS file is. LASSTRICT will fail if one of
these errors is encountered and print out some debug info about the error such
as what is was expecting etc.
Under normal circumstances you should just use the LAS reader and just keep an
eye on how many warnings you are getting. If you are getting a significant
number then it might be worth looking at the data in more detail to check for
issues there is a command spdlastest which can help with that or change to the
LASNP reader. I have tended to find I get a small number of these warnings on
almost every file but I don't know why these seems to occur to regularly.
I hope that helps explain the warnings you are seeing.
Cheers, Pete
****************************************************
* Dr Pete Bunting
* Senior Lecturer in Remote Sensing
* Institute of Geography and Earth Sciences
* Aberystwyth University
* Aberystwyth
* Ceredigion
* SY23 3DB
* UK
*
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****************************************************
On 14 Aug 2013, at 11:45, Roberto Antolín
<[email protected]<mailto:[email protected]>> wrote:
Hi all,
I would like to translate a bunch of LAS files into a SPD format, so I
tried this command:
spdtranslate --if LAS --of SPD -o outputFile.spd -i inputFile.las -x
FIRST_RETURN --temppath /tmp/
I use older versions of spdtranslate and I had no problem. Some weeks
ago I downloaded spdlib form the bitbucket repos and now spdtranslate
throws me this annoying warning:
Start Pulse (Num Returns = 2): p.GetReturnNumber() = 1
In Pulse (Num Returns = 1): pt.GetReturnNumber() = 1
The return number was: 1
The next return number should have been: 2
WARNING: Pulse was written as incompleted pulse.
Any hint on what this warning means and on how to get rid of it?
Thanks,
Roberto
--
Roberto
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