4.10.0: Some vectors not rendering for a layer

Thu Oct 19 23:43:01 PDT 2006

We're still having the problem, so I did some experiments today.

There are 2 shapefiles, d1 & d2. Both have the same coordinates, which
follow the contours of the same roadways. We stop them overlapping by
defining offsets. 

Below is the bit of the mapfile used to render them.

The problem is that only the right offset is displaying for North/South
roadways, and only the bottom for East/West roadways. We're only seeing this
with recently drawn vectors/segments. Older ones render just fine.

I deleted the d2 layer. 

Then I redisplayed the map using the d1 shapefiles (DATA "d1" OFFSET -2
-99). The d1 layer offset to the right for the problem segments. 

When I used the d2 shapefiles to render the d1 layer (DATA "d2" OFFSET -2
-99), the offset was to the left for the problem segments. I don't see how
this can be possible...how can using a different shapefile somehow override
the OFFSET directive for the class?

I cleared all the tiles so that cannot be the problem.

This is really puzzling...any ideas?

LAYER
    		NAME "direction1-13"
		STATUS DEFAULT
		DATA "d1"	
		TILEINDEX "TIGER04/county_index"	
		TYPE LINE
		SIZEUNITS PIXELS
  # ==================================================
  # 	Class: direction 1, Scale 7
  # ==================================================
		CLASS
			MINSCALE 100000
			MAXSCALE 300000
			STYLE
				SYMBOL "cartoline"
				SIZE 3
				COLOR 206 0 0
				OFFSET -2 -99
				ANTIALIAS true
			END
		END
END

LAYER
	 	NAME "direction2-14"
		STATUS DEFAULT
		DATA "d2"
		TILEINDEX "TIGER04/county_index"	  
		TYPE LINE
		SIZEUNITS PIXELS
 # ==================================================
  # 	Class: direction 2, Scale 7
  # ==================================================
		CLASS
			MINSCALE 100000
			MAXSCALE 300000
			STYLE
				SYMBOL "cartoline"
				SIZE 3
				COLOR 206 0 0
				OFFSET 2 -99
				ANTIALIAS true
			END
		END
 END

               André Lockhart
               andre at CoValuate.com
         510.333.7189

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Eijnden, Bart van den (AGI)
Sent: Thursday, October 19, 2006 1:16 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: 4.10.0: Some vectors not rendering for a layer

The benefit comes with displaying a smaller extent than the full =
shapefile, and can be quite large. It's a spatial index (quadtree).

You can generate them using shptree, a utility that comes with Mapserver =
(MS4W).

Best regards,
Bart

-----Oorspronkelijk bericht-----
Van: UMN MapServer Users List
[mailto:MAPSERVER-USERS at LISTS.UMN.EDU]Namens Andre Lockhart
Verzonden: donderdag 19 oktober 2006 10:14
Aan: MAPSERVER-USERS at LISTS.UMN.EDU
Onderwerp: Re: [UMN_MAPSERVER-USERS] 4.10.0: Some vectors not rendering
for a layer

No, we aren't using qix files for these layers.

Also, we are rendering directly from the shapefiles, not via PostGIS or =
some
other RDBMS.=20

Is there any benefit to qix files? If so, how might one (re)generate =
them
using open source tools?

Thanks.

=20
=20

               Andr=E9 Lockhart
               andre at CoValuate.com
         510.333.7189
=20

-----Original Message-----
From: Eijnden, Bart van den (AGI) =
[mailto:b.vdeijnden at agi.rws.minvenw.nl]=20
Sent: Thursday, October 19, 2006 12:45 AM
To: Andre Lockhart; MAPSERVER-USERS at LISTS.UMN.EDU
Subject: RE: [UMN_MAPSERVER-USERS] 4.10.0: Some vectors not rendering =
for a
layer

Are you using a spatial index (qix file)?

If so, did you regenerate the spatial index after the changes?

Best regards,
Bart

-----Oorspronkelijk bericht-----
Van: UMN MapServer Users List
[mailto:MAPSERVER-USERS at LISTS.UMN.EDU]Namens Andre Lockhart
Verzonden: donderdag 19 oktober 2006 9:41
Aan: MAPSERVER-USERS at LISTS.UMN.EDU
Onderwerp: Re: [UMN_MAPSERVER-USERS] 4.10.0: Some vectors not rendering
for a layer

Thanks, Andreas.

We've been on 4.10.0 for a few weeks and already have quotes around our
expression variables. This problem only appeared after we drew new =
vectors
for existing shapefiles.

=20
=20

               Andr=E9 Lockhart
               andre at CoValuate.com
         510.333.7189
=20

-----Original Message-----
From: Andreas Albarello [mailto:andreas.albarello at territoriumonline.com] =

Sent: Thursday, October 19, 2006 12:30 AM
To: Andre Lockhart
Cc: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] 4.10.0: Some vectors not rendering =
for a
layer

Andre Lockhart wrote:
> We have a layer with a few hundred vectors/segments that renders in=20
> different colors based on a class expression. Some of the vectors=20
> render, others do not.
>=20
> We are well under the limit for classes and layers.
>=20
> One clue is that it is the most recently drawn vectors that do not =
render.
>=20
> We've tried rebooting/reinitializing everything, to no avail.

Andre,

I assume everything was working fine with Mapserver prior to version=20
4.10. If that is the case, I suspect you might have run into a problem=20
that I encountered myself with the new release and which I think is=20
related to some changes made in the mapfile lexer.

In particular, I noticed that, when using class expressions of the form

EXPRESSION abcd

(that is a simple string based expression) Mapserver now requires you to =

put quotes around those expressions (i.e. EXPRESSION "abcd") or it=20
*might* fail to recognize them as such. This applies to a layer's FILTER =

as well, but, as with EXPRESSION, only when using string expressions, no =

regular or nested logical expressions (which are still delimited by=20
slashes and brackets, respectively).

Hope this helps.

Best regards,
Andreas

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