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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.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 All, At the Bureau of Meteorology in Melbourne we needed to be able to change Map Projections within an application. Since there has recently been some mention of this sort of thing in the visad list I made a demonstration applet to show how this feature works for us. The applet starts with 4 projections available: Polar Stereographic, Mercator Lambert Conformal, and Direct (longitude -> XAxis, Latitude -> YAxis). In the applet you can select any of these from the menu. The menu choices labelled with Custom allow you to change the projection parameters to suit yourself e.g. centre line or standard latitude; this will then be the one known to the applet. The map boundaries should be handled correctly. For example if the centre of a Mercator projection (-30) leaves the right edge of the map at 150 degrees East then the satellite data should split correctly. Wind barbs should orient correctly when changing to a Polar Stereographic projection. I have also included a color legend bar which does not relate to any data but is simply an example of an object which is unaltered by pan and zoom. If there is any interest in this I can make it available to others (it needs a bit of work yet but we currently use it at BoM). URL: http://www.bom.gov.au/general/development/visad/MapDemo.shtml Cheers Geoff Freeman -- Bureau of Meteorology Phone (03) 9669 4827
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