AGG and WMS
john.cole at UAI.COM
Thu Aug 23 16:05:26 EDT 2007
It's working well for us via WMS, but I did notice that if your format
request had additional specifics besides "image/png" it would return an
error. We only have one png output type defined in our mapfile as well, so
that could be confusing things.
Brent Fraser wrote:
> Sorry for the terse question, here are some more
> I'm using the AGG/PNG output driver (see RFC-32) in
> Mapserver 5.0 beta 4 to render shapefile vectors (no raster
> input) to a PNG graphic file. When I use Mapserver's CGI
> interface to request a graphic map, the lines appear
> anti-aliased (smooth, no jaggies) Great! But when I use
> Mapserver's WMS interface, I get the same old rendering
> Mapserver always gave (lines with jaggies).
> Note there was an email
> T=0&O=D&X=639F0B08FDD720FAC9&P=6714) saying "WSM right now
> only advertise gd and gdal based drivers. See bug 455".
> After some review of the images, it looks like my "DRIVER
> AGG/PNG" produces a 24 bit png file via CGI, but an 8 bit
> png file via WMS. When I try to do AGG/PNG24, I get
> "General error message. OUTPUTFORMAT clause references
> driver AGG/PNG24, but this driver isn't configured." from
> Mapserver. I'll have to do some more digging...
> Brent Fraser
> GeoAnalytic Inc.
> Calgary, Alberta
> ----- Original Message -----
> From: "Christopher Schmidt" <crschmidt at METACARTA.COM>
> To: <MAPSERVER-USERS at LISTS.UMN.EDU>
> Sent: Thursday, August 23, 2007 1:03 PM
> Subject: Re: [UMN_MAPSERVER-USERS] AGG and WMS
>> On Thu, Aug 23, 2007 at 12:32:41PM -0600, Brent Fraser
>> > Is AGG supposed to do anti-aliased output when Mapserver
>> > used as a WMS server?
>> I'm not sure what 'antialiased' output means -- perhaps
> you mean 'alpha
>> transparency', perhaps you mean antialiasing within the
> images, perhaps
>> you mean something else. Can you clarify?
>> The answer to the first is, I believe, "no". WMS spec
> only allows for
>> 'transparency or no transparency', and MapServer does not
>> alpha transparency output in the WMS images.
>> The answer to the second is "Sure" -- the images for
>> http://boston.freemap.in/ are fetched from WMS (by
>> Christopher Schmidt
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