[Gdal-dev] Enabling PAM By Default
hobu.inc at gmail.com
Wed Sep 19 22:36:17 EDT 2007
In my opinion, there is little downside to enabling this by default
in trunk right now. I'll think of it as doing my own little part to
make ESRI's software that much better :P
Seriously, I think this is a good idea, and maybe it will get folks
thinking about incorporating PAM output in other contexts if they
know it will be generally available.
On Sep 19, 2007, at 9:51 PM, Frank Warmerdam wrote:
> A mechanism called PAM (Persistent Auxilary Metadata) was
> engineered into
> GDAL around the 1.3.0 timeframe I think. This is essentially a
> to store georeferencing, metadata, statistics and other auxilary data
> in an XML file associated with a dataset for formats that don't
> the information internally. The XML file has the extension .aux.xml.
> Currently this mechanism is only enabled if the GDAL_PAM_ENABLED
> configuration option (ie. env. variable) is YES. Thus, by default we
> have not been using it most of the time. It is enabled by default in
> ArcGIS and I sometimes run with it enabled.
> I would like to move to having PAM turned on by default during our
> development cycle and to have a build option indicating whether it is
> enabled or disabled. Shortly before 1.5 release we should be able to
> make a final decision on whether we want it enabled in the 1.5.0
> release depending on whether we find it is causing many problems.
> My longer term goal is to have it on all the time except when
> turned off - that is to have it as a default behavior. Mainly I
> want this
> because it is hard to be sure it is working properly when it is rarely
> used except in the ArcGIS environment. But I also think it is a
> facility and could be a benefit to most GDAL users if more was
> known about
> it, and it was generally available.
> Does anyone have an objection to my turning it on now, and us having a
> formal motion on whether it should be enabled shortly before the 1.5
> release? Some rather brief information on PAM is available at:
> BTW, I have confirmed that the autotest suite runs clean (at least
> on linux)
> with PAM enabled.
> Best regards,
> I set the clouds in motion - turn up | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush | President OSGeo, http://
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