[mapguide-users] RE: About FDO

[Dave Wilson]

I think there may be some misunderstanding here. From the sounds of
things it seems to me you are talking about native MySQL spatial data vs
FDO Datastored based data, correct?

Prior to the current beta of open source with overrides it is not
possible to specify a coordinate system for a native MySQL Spatial
table. (ie you load the data using SHP2MySQL or something similar).
There is an SRID column in the MySQL schema, but it is not implemented
in MySQL or currently used by FDO that I am aware of. In other words
SRID's aren't implemented as they are in Oracle.

It should be possible in current MapGuide and in the Beta to create a
map and specify the coordinate system that the data is measured in and
the map should preview. However if the layers are to be used in a map
with a different coordinate system they will not transform unless you
have the override option in the Beta. If you have Map and can create an
FDO Datastore there is a coordinate system defined with the data and
this should work fine.

Another issue with using MySQL that is important to note is that it
currently only supports Envelope based spatial operations. So when a
user attempts to select a polygon in a map there are cases where the
adjacent polygon is selected because MySQL executes an
EnvelopeIntersects rather than an Intersects operation. If you can
imagine drawing an envelope rectangle around to adjacent polygons and
note where you clicked to select that if the rectangles overlap the
selection will choose the one with the lowest id. This is a flaw, but
only because MySQL isn't fully spatial capable. The results are that
selection can be somewhat inconsistent on polygon layers. This may also
apply to polylines, but I have yet to determine if this is the case.

Regards,
Dave


-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Andy
Morsell
Sent: Thursday, May 24, 2007 10:02 AM
To: 'MapGuide Users Mail List'
Subject: RE: [mapguide-users] RE: About FDO

To create data, data connections, layers, maps and so on it is easiest
to
use one of the GUI's available.  MapGuide Open Source comes with Web
Studio.
Or, you can use  the fully featured Autodesk MapGuide Studio.  You can
download and use a preview version from here:
http://usa.autodesk.com/adsk/servlet/index?id=7176611&siteID=123112


Andy 

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Dhirendra
Kumar
Sent: Thursday, May 24, 2007 5:17 AM
To: mapguide-users at lists.osgeo.org
Subject: [mapguide-users] RE: About FDO


Hi Andy Morsell,

Thankyou for your replay, I have succesfully establish mapguide
connection
with MySQL 5.0. But i have not idea how to make layer using this
connection
and define Cordinate system, So please guide me, how to make layers ? I
am
waiting for your valuable replay.

Regards,
Dhirendra Kumar

Andy Morsell wrote:
> 
> What you describe is not really a function of FDO but rather of the 
> MapGuide API.  If you just need to update layer properties and refresh

> the layer and map, then it doesn't matter what your feature source 
> type is.  Any database (that supports your geometry types) will work 
> fine for this type of application.
> 
> 
> Andy Morsell, P.E.
> Spatial Integrators, Inc.
> http://www.SpatialGIS.com
> 
> -----Original Message-----
> From: mapguide-users-bounces at lists.osgeo.org
> [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Dhirendra
> Kumar
> Sent: Monday, May 21, 2007 10:45 PM
> To: mapguide-users at lists.osgeo.org
> Subject: [mapguide-users] About FDO
> 
> 
> Hi All,
> 
> I want to use FDO connectivity with MySQL or Oracle. So, first i want
to
> know some information about FDO when i shall use Oracle with FDO then
> during
> run time FDO direct Connect Oracle Database ? I am asking this Qustion
> because my client requirments is to change layers property during run
> time,
> Co'uz they want to update Database time to time and as per updation
they
> want to show features on map. Is it possible with FDO ? if yes then
tell
> me
> which database is more sutable with MGOS ? and posible then send me
some
> Examples of FDO Connectvity with some Quieries Example.
> 
> Thankyou in Advance,
> 
> Regards,Dhirendra Kumar
> --
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