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Re: LAS problem using files with trivial vertical dimension



Martin,

Thanks for identifying and solving the problem.  I'll have a look later this
week and, if your change looks good, check it in to CVS.

One beta tester brownie point for Martin!


-- jon


Martin Dix wrote:

> Our LAS server has a mixture of data with 2 and 3 spatial dimensions.
> Some of the 2D files have a trivial vertical dimension to indicate
> they're on the surface (e.g. surface fluxes from an ocean model). A
> sample XML file contains
>  <avg3a_shfl_climl1_m1_12_y121_350_nc_Surface units="cm" type="z">
>   <v>0
>   </v>
>
> There's a problem when one tries to look at one of these 2D datasets
> after accessing a genuine 3D dataset in the same LAS session. LAS
> remembers the level chosen from the 3D file and tries to apply it to the
> 2D file. The error message looks something like
>
> Illegal Limits
> Sorry ...
>
>      **ERROR: illegal limits: "HFL" is not in the range Z=127.9in the
> range : to :
>           Axis extremes are Z=-0.5:0.5: and continue to :
>
> Please try again with a time that lies within this range.
>
> Note that this problem doesn't arise with ordinary 2D files, only the
> ones with the trivial vertical dimension. Choosing "Start Over" is not
> enough to clear this state, it seems to be necessary to restart the
> browser.
>
> In one respect, LAS recognises that these really are 2D files and
> doesn't display a selection widget for the vertical dimension.
> RegionConstraint.java checks whether an axis is trivial (with length 1)
> when setting this up.
>
>     for (Iterator i = mAxes.iterator(); i.hasNext(); ){
>       IAxis a = (IAxis)i.next();
>       if (a.getSize() > 1 && !a.isAnalysis()){
>         mAxesSet.add(a.getType());
>
> I think there needs to be a similar check in XmlRequester.java. The
> following change fixed the problem I had (note that I'm using 6.2 from
> CVS, 6.1 had the same problem but the line numbers are different)
>
> % diff -c XmlRequester.java XmlRequester.java.old
> *** XmlRequester.java   Mon Apr 14 11:55:08 2003
> --- XmlRequester.java.old       Mon Apr 14 11:53:16 2003
> ***************
> *** 162,168 ****
>       aTag.addChild(argTag);
>       for (Iterator i = varInfo.getAxes().iterator(); i.hasNext(); ){
>         IAxis ax = (IAxis)i.next();
> !       if (ax.getSize() <=  1 || ax.isAnalysis()){
>         continue;
>         }
>
> --- 162,168 ----
>       aTag.addChild(argTag);
>       for (Iterator i = varInfo.getAxes().iterator(); i.hasNext(); ){
>         IAxis ax = (IAxis)i.next();
> !       if (ax.isAnalysis()){
>         continue;
>         }
>
>
> Apologies if this doesn't seem very clear. Unfortunately our LAS server
> is still an experimental one behind our firewall so you can't see the
> problem for yourself.
>
> Regards
>
> Martin Dix



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