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[IDV #SME-839174]: Resolution loss viewing GINI

Hi Art-


> > You would set the lines and elements boxes.  For example, my setup
> > for the GINI 1km has:
> >
> > mag=1
> > lines/elements=800 800
> > place=center
> > latlon=40 -105
> 
> Please bear with me... I'm still not understanding this.  

No problem.  It's not the most intuitive widget and is very
"McIDAS-centric"

> Does your
> comment below about the widget capabilities mean I can't fully set the
> above items in the "Data Chooser"?  On my "Data Chooser" near the bottom
> it gives me the options "Location [Center or Upper left] [Line: ______
> Element _____ or Lat ____ Lon ____]".  Do Line/Element and Lat/Lon here
> refer to different items specifying the location and dimensions of the
> subset, or do they both refer to the same thing being the location of the
> center or upper left of the subset?  

The latter.  It is specifying where in the image you are placing
the center or upper left point.  It can either be in geographic (lat/lon)
or image  (line/element) coordinates.

What version of IDV are you running?  In the latest 2.3 release, 
we changed the widget slightly.

You should  have 2 lines in the widget:

Location:   - sets the position in the image for the center/upper left point
Image Size: - sets the size of  the returned image

Use the image size to specify the size of the image returned at the
resolution you specify with the specified magnification.  So for
1km imagery at mag=1, you could use 1000x1000 to get an image
1000 km on a side.  If  you set the mag to be -2 and kept 1000x1000
for the size, you would end up with a 2000x2000 km image because
it would sample every other pixel.

> I guess I'm confused about whether
> I'm supposed to be able to set the above items in the chooser or if they
> have to be set in a config file, and also whether lines/elements refers to
> the location or dimension of the subset.

You can set the defaults in the config file, but override them with
the widget.

> > If you always want this to be the default, you can create an
> > imagedefaults.xml file in your ~/home/.metapps/DefaultIdv directory
> > that would look like:
> >
> > <?xml version="1.0" encoding="UTF-8"?>
> > <imagedefaults>
> >  <default
> >     name="GINIEAST/GE1KVIS"
> >     key="LATLON"
> >     place="CENTER"
> >     loc="40 -105"
> >     mag="1 1"
> >     size="800 800"/>
> > </imagedefaults>
> >
> > We don't yet have a way for users to set these options from the
> > widget, but that's in the plans for some future release.
> 
> So, should I interpret this as meaning I can't view full resolution
> imagery without modifying the config file?
> 
> > You can find
> > more information on the imagedefaults file in the User's Guide:
> >
> > http://www.unidata.ucar.edu/software/IDV/docs/userguide/misc/ImageDefaults.html
> 
> Okay, thanks.
> 
> >> I also have a follow-up question:  The image displays don't seem to have
> >> full resolution in pixel Z-depth, i.e. the shades of
> >> temperature/brightness seem to jump coarsely from one level to the next
> >> compared to what I get when I view the same imagery in garp.  Do you know
> >> what would cause this and is there a setting I can change to fix that?
> >
> > What's the color depth of your display (8,24 or 32?)  Garp grabs the
> > colors it needs right up front and the IDV uses whatever colors  are
> > available (left).
> 
> This is on a Windows XP box.  The graphics options for "Display
> Properties->Settings" allows for a "Color quality" of 16-bit and 32-bit.
> I've tried both with the same results.  Is there something else I should
> set?  The graphics card is an ATI Radeon 7000 with 32MB cache.

I was hoping that 32 bit would be better.  Do you have other applications
running on the system that are sucking up colors?  Another thing is to
try updating the video card driver.  Sorry I can't be much more help
than that.

Don

Ticket Details
===================
Ticket ID: SME-839174
Department: Support IDV
Priority: Normal
Status: Open