[OSGeo-Discuss] las spec doubt

[andrea antonello]

Fair enough,
will ask there.

Cheers,
Andrea

On Thu, Oct 31, 2013 at 4:24 PM, Howard Butler <howard at hobu.co> wrote:
>
> On Oct 31, 2013, at 2:38 AM, andrea antonello <andrea.antonello at gmail.com> wrote:
>
>> Hi everyone, I hope this is not OT.
>> I wanted to ask a short advice on a las file content problem.
>>
>> I wanted to get a short comment about how GPS Week Time is seen in the
>> las format.
>>
>> Let's assume the las file format is prior to 1.2, so no encoding
>> information is available to open possibility for adjusted gps time.
>>
>> In that case, is it so that the Gps Week Time is just the seconds in
>> the week, without any information about the week?
>> I was under the assumption that the format of GPS Week Time would be
>> "week.time" as content of the double, hence giving a full timestamp
>> information.
>>
>> I can't find a document exactly specifying this, the las specs just
>> state: "GPS Time: The GPS time is the double floating point time tag
>> value at which the point was acquired."
>>
>> It is interesting, since I often found the header's date not being
>> accurate (and seems to reflect the file modification date), making it
>> impossible for me to define a unique timestamp.
>>
>> Thanks for any comment, or link to docs.
>
> This item is quite off-topic for this mailing list. I suggest emailing the following google group for access to more LAS implementors and knowledgable folks.
>
> https://groups.google.com/forum/#!forum/lasroom
>
> Howard
>