[Liblas-devel] Specification for point dimensionality

[Mike Grant]

Hi Howard,

On 25/02/10 16:10, Howard Butler wrote:
> I would like to
> propose that we provide a liblas.org VLR record that contains an XML
> file to describe the dimensions, their sizes, if they are used, etc.
[snip]
> I propose each entry in the file have the following attributes:

Not sure if LAS mandates a global endian format, but it'd be good to
include that if not.

> All this would be properly namespaced XML (liblas.org or something)
> along with whatever we can find for standards such as those for
> describing data types, etc.  Maybe there's an existing standard for
> something like this already, I don't know.

I've come across two things that might be worth looking at - they're not
directly usable here, but they may provide some guidance/ideas:

 http://www.gdal.org/ogr/drv_vrt.html (also
http://www.gdal.org/gdal_vrttut.html)
  - GDAL's XML format for describing data (see the fields section)

 http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/ch03s05.html
  - CF Conventions for netCDF data (bitfields section)

On a vaguely related note, it'd be nice to have a VLR XML (ISO) that
described the dataset for archival and metadata purposes.  Probably more
something for a LAS 1.4 discussion though.

Cheers,

Mike.

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