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[IDV #BWS-773802]: IDV - lat-lon projection editing

Hi Alan-

> Institution: COMET
> Package Version: 2.0
> Operating System: os.name:Windows XP; os.arch:x86; os.version:5.1;
> Hardware Information: java.vendor:Sun Microsystems Inc.; 
> java.version:1.5.0_06; java.home:C:\\Program Files\\IDV_2.0\\jre; 
> j3d.version:1.3.2 fcs (build12); j3d.vendor:Sun Microsystems, Inc.; 
> j3d.renderer:OpenGL;
> Inquiry: Hi guys,
> I've been trying to tweak some projections so that I can match other plots I 
> already have.
> It appears that there is no way to edit the parameters for a lat/lon 
> projection,
> we're stuck with an origin of 0 lat / 0 lon. Is there anyway around this?

At present, there's not a way to set the corners of the box.  It's on
our (long) list of things to do.

In  the projection manager when you create a new projection, you can
move the center point by right clicking and dragging the map.  So,
if you do that and move it so australia is in the middle of the
panel, that will shift the center point.  You can then use the
box to define the bounding region.

However, that might not be as exact as you want it.  To further
refine this, after you save the map and exit the IDV, you can edit 
the file that stores the map parameters.  In you .metapps/DefaultIdv
directory under your home directory, you should see a projections.xml
file.  Make a backup of this before editing!  Then edit the
file with a text editor and tweak the parameters.  Here's an 
example of one I creates by moving the map:

    <method name="add">
        <object class="ucar.unidata.geoloc.projection.LatLonProjection">
            <property name="CenterLon">
                <double>135.00000000000003</double>
            </property>
            <property name="DefaultMapArea">
                <object class="ucar.unidata.geoloc.ProjectionRect">
                    <constructor>
                        <double>108.00000000000004</double>
                        <double>-54.0</double>
                        <double>162.00000000000006</double>
                        <double>5.399999999999999</double>
                    </constructor>
                </object>
            </property>
            <property name="Name">
                <string><![CDATA[oz]]></string>
            </property>
        </object>
    </method>

You can edit the center lon as well as the bounding box.  The
parameters for the bounding box (ProjectionRect) are lower left
lon, lower left lat, upper right lon, upper right lat respectively.

When you start the IDV, this projection will have the new settings.

Not that straightforward, but doable as long as you don't mess
up editing. ;-)

> (I'm trying to split the projection in western Australia so that I can more 
> cleanly separate the Pacific and Indian Oceans).
> 
> BTW, I'm using using version 2.0.

Don Murray

Ticket Details
===================
Ticket ID: BWS-773802
Department: Support IDV
Priority: Normal
Status: Open