[Geotools-devel] [jira] (GEOT-4359) Going from 2d to 3d CRS without exceptions

[Jody Garnett (JIRA)]

Jody Garnett created GEOT-4359 Going from 2d to 3d CRS without exceptions Issue Type: Bug Affects Versions: 9.0-M0 Assignee: Andrea Aime Attachments: 3dTo2d.patch Components: referencing, render Created: 27/Dec/12 12:28 AM Description: From email: Hi, I see that Jody is busy adding ad hoc code in GeoTools and GeoServer to handle a case of transforming from 2d to 3d coordinates. While not 100% correct, the transformation is unfortunately require as we try to handle rendering 3d data over a 2d surface, since that often/always requires also building the reverse transformation (2d -> 3d), either to compute the size of a pixel in source coordinates (for generalization), or pinpoint where a clicked pixel lives in source coordinates (to query the clicked feature). Instead of sprinkling around ad-hoc changes I'd say it's better to allow a 2d to 3d transformation, making the elevation be 0 in the target result. The attached patch goes into that direction, Jody, could you give it a shot and see if that works? The patch for the moment uses the "lenient datum shift" flag to be activated, basically, if we say that transforming datums even if we have no bursa wolf params around is ok, then it's also ok to go from 2d to 3d without throwing an exception (which is of course illogical in general) In fact the flag would have to be renamed to just "lenient transform"... Alternatively, we could just decide that there is no need to throw exceptions when hopping from 2d to 3d, in the end of the day, 2d is like having the coordinates on the flat plane, so at 0 elevation. On the other side, null is not 0, and on 2d, we really don't know what the elevation is. Suggestions, opinions? Cheers Andrea Further: Ah, and when transforming a 2d envelope to a 3d one we should make it so that the 3d one is encopassing all possible elevations instead (basically, same projection as the 2d one, but minZ = Double.NEGATIVE_INFINITY, maxZ = Double.POSITIVE_INFINITY Cheers Andrea Project: GeoTools Priority: Major Reporter: Jody Garnett

This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators. For more information on JIRA, see: http://www.atlassian.com/software/jira

------------------------------------------------------------------------------
Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS,
MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current
with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft
MVPs and experts. ON SALE this month only -- learn more at:
http://p.sf.net/sfu/learnmore_122712
_______________________________________________
GeoTools-Devel mailing list
GeoTools-Devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geotools-devel