[mapguide-users] shp or sdf advantages/disadvanatges

[Traian Stanev]

That depends on the data. I have seen it both ways (SDF bigger or SHP+DBF bigger). Have in mind the SDF contains the equivalent of the SHP and the DBF combined, and has a spatial index also (in the same file).
Most of the time SDF will perform better, especially for more complex geometries or when you are fetching multiple attributes. You can use Studio to do the conversion and experiment with SDF yourself. Yes, you can use the SDF for tooltips and attribute data without the need of a DBF. 
 
Traian
 

	-----Original Message----- 
	From: Zac Spitzer [mailto:zac.spitzer at gmail.com] 
	Sent: Thu 5/18/2006 3:31 AM 
	To: users at mapguide.osgeo.org 
	Cc: 
	Subject: Re: [mapguide-users] shp or sdf advantages/disadvanatges
	
	

	the same data in a SDF format is smaller than the equivalent data in SHP format
	
	On 5/18/06, shailesh <shailesh at simplexindia.com> wrote:
	>
	>  hi
	>  I am currently using shp files for data resources and some of the data is
	> above 80 mb
	>  I think it makes the map very slow to load
	> does converting into sdf or another format help it load faster.
	> what are advantages /disadvantages .in terms of laoding speed,attribute
	> table data etc
	>
	> can i use the convert to sdf option in studio or a there any other
	> specialized toosl for doing it.
	> if converted to sdf can i still use the dbf assoicated with shp for tooltips
	> and attribute data
	>
	> -shailesh
	>
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	--
	Zac Spitzer
	http://whereszac.org
	0405 847 168
	
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