AW: [UMN_MAPSERVER-USERS] Strange map draw issue
arndw at WTAL.DE
Thu Sep 14 13:52:36 EDT 2006
Perhaps you can allow access via WMS Request (if your map is for WMS
Mit freundlichen Grüssen
Von: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] Im
Auftrag von Steve Hall
Gesendet: Donnerstag, 14. September 2006 18:56
An: MAPSERVER-USERS at LISTS.UMN.EDU
Betreff: Re: [UMN_MAPSERVER-USERS] Strange map draw issue
Sorry Ed, I must have forgotten to put that part in my email.
Yes, a simple refresh of the same map will, 9 times ot of 10, get rid of the
garbage. But then at a random interval it will reappear (but will be
It's kind of hard for me to "post" the entire app, or allow access, right
now i'm afraid so I appreciate it may be hard for anyone to help, I as just
fishing for ideas really!
Ed McNierney wrote:
> Steve -
> I actually was asking if the output changed if the SAME map was
> refreshed - don't zoom in, out, or pan, just refresh the image/reload
> the page. Does the same image request always return the same image?
> - Ed
> Ed McNierney
> President and Chief Mapmaker
> TopoZone.com / Maps a la carte, Inc.
> 73 Princeton Street, Suite 305
> North Chelmsford, MA 01863
> ed at topozone.com
> (978) 251-4242
> *From:* Steve Hall [mailto:steve.hall at mercatorgeosystems.co.uk]
> *Sent:* Thursday, September 14, 2006 10:39 AM
> *To:* Ed McNierney
> *Cc:* MAPSERVER-USERS at LISTS.UMN.EDU
> *Subject:* Re: [UMN_MAPSERVER-USERS] Strange map draw issue
> Hi Ed,
> Thanks for this. I may check my label columns in the database for
> NULLs and replace them with an empty string ('') instead. It looks
> like a classic 'null' issue doesn't it?
> Yup - zoom in, zoom out, pan etc and the garbage generally just
> disappears, or changes its 'content'. Often the angle is the same
> (suspicious) but sometimes not..... There aren't any features on the
> angles so i'm not sure if it's a labelling issue or not. Plus the
> problem only occurs about 1 in 20 or so map draws so is kind of hard
> to get a definite problem case.
> Checkout these additional ones :
> And just to prove it's not all CA.... ;-)
> Thanks Ed,
> Take a
> Ed McNierney wrote:
>> Steve -
>> Well, just about anything in California is a little odd.....
>> Are you saying that if you simply refresh the image and re-draw the
>> exact same map you'll see this line of text change? That's puzzling.
>> I would speculate that it's a (garbage) text label for some garbage
>> feature - there's some feature that's defective in both location and
>> label (attributes messed up) and that feature is being labeled.
>> The first thing I'd try is to eliminate layers from the image,
>> testing until the garbage goes away. That could identify the
>> offending layer; if there are multiple classes in that layer, use the
>> same system to identify which class it is. Then see if that says
>> anything helpful.
>> - Ed
>> Ed McNierney
>> President and Chief Mapmaker
>> TopoZone.com / Maps a la carte, Inc.
>> 73 Princeton Street, Suite 305
>> North Chelmsford, MA 01863
>> ed at topozone.com
>> (978) 251-4242
>> *From:* UMN MapServer Users List
>> [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] *On Behalf Of *Steve Hall
>> *Sent:* Thursday, September 14, 2006 9:22 AM
>> *To:* MAPSERVER-USERS at LISTS.UMN.EDU
>> *Subject:* [UMN_MAPSERVER-USERS] Strange map draw issue
>> Hi All,
>> I've been using Mapserver for a while now, in a variety of
>> situations, but am seeing a slightly strange behaviour in one of my
>> setups. Basically i'm getting a line of 'garbage' being drawn across
>> the generated map image.
>> A sample of what I mean is here :
>> There is no road feature or other line that should be there, and if I
>> redraw the map the line of garbage will either disappear or change in
>> either length or 'content'. It doesn't appear all the time, but
>> certainly enough to be annoying.
>> My MapServer version is 4.8.1, running with Apache 1.3.31 on Fedora
>> Core 4. I've got several other MapServer based configurations on
>> this setup and they're all working fine. The data source in
>> question is an Oracle 10g (10.1) database which is also used for
>> other systems and seems fine.....
>> Weird eh? Any suggestions much appreciated!
>> Steve H
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