Θέμα: Re: [UMN_MAPSERVER-USERS] WFS for advanced queries ?

[korakas koarkis]

Hm interesting....
You mean first I take the Geometry of the road
and then check for all Cities if that geometry Intersect the city geometry.

The interesection can be implemented in one GetFeaute request or in x (x = number of cities ??)

Thanks in advance
Kio

"Kralidis,Tom [Burlington]" <Tom.Kralidis at EC.GC.CA> έγραψε:  
Ah, ok.  For that kind of scenario (and I want to find :"The Road with name X which Cities crosses ?"), you could:

- query a roads WFS to get geometry
- pass these geometries to a WFS Intersect filter to seek
 
..Tom



________________________________

 From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On Behalf Of korakas koarkis
 Sent: 16 February, 2007 9:45 AM
 To: MAPSERVER-USERS at LISTS.UMN.EDU
 Subject: Re: [UMN_MAPSERVER-USERS] WFS for advanced queries ?
 
 
 To setup database views is an option BUT has several limitations:
 1) I must know in advance the queries that the user will issue
 2) I dont know what happens with db perfomance: Consider that there will be a great volume of data in terms of tables and content of the tables.
 
 My goal is to act as a content provider with an API for visualazation and querying.
 I consider OGC through WMS and WFS but if understood correctly WFS cannot fullfill my needs... (right??)
 
 For example lets say that I have two tables Cities and Roads
 and I want to find :"The Road with name X which Cities crosses ?"
 
 and then HighLight these cities!
 
 This query can be supported in MapServer ?
 
 
 
 "Bart van den Eijnden (OSGIS)"  έγραψε: 

  WFS won't allow you currently to do advanced queries.
  
  If your queries are known beforehand, you can setup database views and use
  those views as a typename in WFS.
  
  If that's not possible, you need a more direct way of controlling your
  queries, Mapscript could be an option then (setting the DATA statement
  dynamically on a LAYER).
  
  Best regards,
  Bart
  
  --
  Bart van den Eijnden
  OSGIS, Open Source GIS
  http://www.osgis.nl
  
  
  --------- Oorspronkelijk bericht --------
  Van: korakas koarkis 
  Naar: MAPSERVER-USERS at LISTS.UMN.EDU 
  Onderwerp: [UMN_MAPSERVER-USERS] WFS for advanced queries ?
  Datum: 16/02/07 12:15
  
  > Hi all,I have a PostGIS installed, and I want to setup above a Framework
  for  visualization and advanced querying the of data. (By the term
  advanced I mean inner/outer join etc)I was thinking to use UMN Mapserver
  with OCG standards:*) WMS for visualization and*) WFS for quering the
  dataDoes MapServer handles advanced querying through WFS, or do I have to
  consider some other API (MapScript) ?ThxKio 
  > 
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