[mapguide-users] Shapefile Features Not Rendering

GISDOTNET aaron.ford at ntierdigm.com
Wed Oct 22 12:20:53 EDT 2008


Thanks for the education; I'll investigate further on the net. Is there a
document that describes how to migrate from SDE or SHP data to SDF?

Not sure if SDF will solve our issues either, but we need to identify the
cause of and solution for these rendering issues.



JasonBirch wrote:
> AGG (Anti-Grain Geometry) and GD are two open source graphics libraries,
> both near the top of the Google search results if you need more info.  
> MapGuide initially used GD exclusively for rendering, but it was unable
> to handle advanced anti-aliasing very well so for MGOS 2.0 an AGG-based
> renderer was introduced as the default.  Unfortunately, there are a few
> outstanding bugs with the AGG renderer.  I haven't seen these when using
> scale ranges to limit the display of dense data to large scales only,
> but there are some cases where GD is currently a better choice.
> To my knowledge, FDO doesn't have an annotation type; it only supports
> OGC geometry types.  I'm not using a system with native annotation
> objects, but I would imagine that the only workaround for this is to
> have MapGuide label the lines that FDO is presenting, and remove the
> styling from the lines?
> What version of MGOS are you using?  There's been some discussion
> recently about the ArcSDE provider on the fdo-users mailing list, and
> apparently there have been some speed improvements recently.  No
> first-hand experience with this though...  My experience has shown that
> using a spatially-indexed file-based format such as SDF or SQLite is
> considerably faster than any of the RDBMS providers though.
> Jason
> -----Original Message-----
> Subject: RE: [mapguide-users] Shapefile Features Not Rendering
> For my own education and perhaps other reading this thread, what does
> and GD stand for and what is the difference between the two renderers?
> Regarding the second issue, the FDO provider doesn't recognize
> annotation as
> annotation and sees it as a line type. Maybe that's by design and I'm
> not
> using it correctly. Let me know. Regardless, from what I have read and
> seen
> first hand is that the FDO provider for SDE is very slow and seldom
> used.
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