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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Tom, NB forgot to mention that I'm using v2.4. The original method I was trying was selecting the "visible range" check box beneath the colour table button on the Display tab of the Dashboard, which un-greys-out the "Change" button next to it, and using that button to change the visible range. No joy. I tried your method but it fails in the same way as my original method -- see attached pic. Your example picture is exactly what I'm trying to achieve so I'm at a loss as to why it's not working for me! I do wonder if this problem is in some way tied to the sat pic I'm using, which is a MSG image. It only displays if I use the "MSGT" projection -- switching to a different projection, such as the predefined Europe projection for a more top-down view, causes the satellite picture to disappear (all the other displays remain). To test that I recreated something similar to your example image (using 2.5 deg data to save time, hence the blockiness!). Using my original "visible range" method has the desired result (see second attachment). I also tried your method, which also worked. (BTW note the odd bug in the second image with the display list text -- it's hidden behind the satpic. This again seems related to the projection: I was using the predefined US CONUS projection. The display list appeared normally using "World" or "North Pole".) Dan On 4/20/08, Tom Whittaker <whittaker@xxxxxxxx> wrote: > Hi Dan -- > > I assume from your description that you tried to do a "change range" > on the theta-e plot. In my example, the original range was > 250-420K.....so perhaps you just tried changing the range to something > like 310-420K or something? > > The behaviour of this is that it then treats all values from 250-309 > as if there were equal to 310, for the purpose of mapping from the > data to the color table. > > The way I know of to accomplish this is to edit the color table, click > on the "Transparency" radio button, set the transparency to 100%, and > then grab the slider above the "250" and drag it to the right (you > should see black/white checkboard pattern). You will then get > something like the attached (I hope) image. > > Hope that helps... > > tom > > > On Sun, Apr 20, 2008 at 12:42 PM, Dan Grey <dangrey@xxxxxxxxx> wrote: > > I've got a sat pic (from a server under "Images") on the surface, and > > a colour-shaded plot of theta-e at 850 hPa from the GFS above. I > > restrict the visible range of the theta-e to a value so only areas > > above a certain value are shown (to illustrate a plume event). However > > areas with theta-e below my range appear black, rather than showing > > through the sat pic below. > > > > Am I missing something simple, is this is intended behaviour, or is it a > bug? > > > > > > Dan
Attachment:
satnthetae.jpg
Description: JPEG image
Attachment:
ussatnthetae.jpg
Description: JPEG image
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