You are correct-assuming a simple rotation will be incorrect. This is true for many projections, but quite noticeable in polar stereographic. Fortunately, the solution is easy-your additional rotation factor is (if memory serves me) equal to your longitude at a given location. So at the prime meridian, your additional rotation factor is 0 (wind direction angle + 0 degrees), and at the other side of the world, your additional rotation factor is 180 (wind direction angle + 180 degrees).
Best, Steve http://www.clemetparks.com/images/esig/cmp-ms-90x122.pngStephen Mather Geographic Information Systems (GIS) Manager (216) 635-3243 [email protected] <http://www.clemetparks.com/> clevelandmetroparks.com From: Chris Haste [mailto:[email protected]] Sent: Tuesday, May 15, 2012 6:09 AM To: [email protected] Subject: [Geoserver-users] SLD Rotation Hi All, I have a question.. If I want to use the ESRI Weather font to display symbols that indicate wind speed and direction then that would appear to be quite straight forward in a Cartesian projection as rotating the symbol to the value given for the wind direction will give the correct result. But I suspect, and this is my question, that when the background map is projected into, for example, a polar stereographic projection rotating the symbols via the SLD will give incorrect results. Could someone confirm this suspicion and maybe point me in the direction of how to ensure that the TTF symbol rotation is always correct regardless of the projection? Thanks Chris *** This communication has been sent from World Fuel Services Corporation or its subsidiaries or its affiliates for the intended recipient only and may contain proprietary, confidential or privileged information. If you are not the intended recipient, any review, disclosure, copying, use, or distribution of the information included in this communication and any attachments is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to this communication and delete the communication, including any attachments, from your computer. Electronic communications sent to or from World Fuel Services Corporation or its subsidiaries or its affiliates may be monitored for quality assurance and compliance purposes.***
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