[idvusers] ISL image alignment problem

• To: "idvusers@xxxxxxxxxxxxxxxx" <idvusers@xxxxxxxxxxxxxxxx>
• Subject: [idvusers] ISL image alignment problem
• From: Paul Graham <meteorpaul@xxxxxxxxx>
• Date: Tue, 11 Mar 2014 09:02:44 +1100

Hi IDV'ers,

I have several ISL scripts, each referencing its own '.xidv' bundle for the
same bounding box and projection.  The problem is that all the resulting
images  should be perfectly aligned--they are all for the same bounding
box/projection--but this is not happening.

I tried setting '<viewpoint scale="0.68"/>' in each ISL file to ensure the
images are the same size.  However, there are small differences which
prevent them matching when they are overlaid.

After poking around with the '.xidv' bundle files, I found the culprit
seems to be the float values, which were slightly different in several of
the files, in the following section:

<object class="java.awt.geom.Rectangle2D$Float">
<constructor>
    <float>105.0</float>
    <float>-50.0</float>
    <float>60.0</float>
    <float>50.0</float>
</constructor>

Editing these '.xidv' files to ensure all floats are the same, seems to fix
the misalignment problem.

Now I'm interested to know what ISL commands will override the above
section of the 'xidv' bundles to ensure resulting graphics perfectly align
when overlayed.

Thanks in advance,

Paul