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[McIDAS #VSG-323612]: Navigation error when plotting image beyond a certain dimension



Hi Kwan,

re:
> When I come to think of it, it seems a bit odd that only the navigation is
> confused when the plot dimension is too large, while the image itself is
> displayed correctly.

The size limitation is somewhere in the MAP program code or in a routine
that it calls.  The limitation on size of an image that can be displayed
is in the IMGDISP program and/or include file(s) included.

re:
> In any case, what I was trying to accomplish was to
> display surface obs. onto the large U.S. radar image at 1km resolution.  I
> specified a larger size than the radar domain so as to cover a bit more
> into ocean.

OK.

re:
> Since it is beyond the capable size, I tried to plot the
> surface data using MAG=-2.

Surface data?  the MAG= keyword is used by the IMGAGE commands, not
commands that plot POINT data.

re:
> However, the data appear too dense even with
> DEC=YES.  That's why I would like to see if I could specify a data density
> factor for de-cluttering.  But I do not seem to find such a factor in the
> manual.

As far as I know, there is no external control on the decluttering algorithm.
That being said, the approach taken for decluttering is _supposed_ to thin
out the stations being plotted so that new new value overwrites an existing
one on the display.  I am very surprised that this would not work.  In
most cases, users want to plot more values even if they will overwrite each
other by a bit, not visa versa.

re:
> Thanks again,

No worries.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: VSG-323612
Department: Support McIDAS
Priority: Normal
Status: Closed
===================
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NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.