FW: [UMN_MAPSERVER-USERS] Upgrade to MapServer 5.0.2 from 4.8.1: extent/scale calculation changes?

[Doyon, Jean-Francois]

G'day y'all ...
 
Posted this to the user's list but had no luck ... anyone?
 
We might have to delay upgrade to 5 and AGG by months if there are indeed undocumented changes to the way scale is calculated :(
 
Thanks,
J.F.

________________________________

From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On Behalf Of Doyon, Jean-Francois
Sent: February 4, 2008 10:12
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: [UMN_MAPSERVER-USERS] Upgrade to MapServer 5.0.2 from 4.8.1: extent/scale calculation changes?



Hello, 

Although all the cartographic testing has been done, I just tested for the first time upgrading 4.8.1 to 5.0.2 with my JavaScript mapping UI, and have discovered something troubling:

For a given map file, the final extent and scale calculations are different between the two versions! 

For the same mapfile "105.map" with: 

EXTENT -2750564.75 -936638.5 3583872.5 4673125 

With 4.8.1: 

http://atlas.nrcan.gc.ca/cgi-bin/mapserv?map=/home/atlas/mapdata/english/105.map&map_web_template=/home/atlas/mapdata/to_zope_new.html&mapsize=428+380&map_scalebar_imagecolor=255+255+255 <http://atlas.nrcan.gc.ca/cgi-bin/mapserv?map=/home/atlas/mapdata/english/105.map&map_web_template=/home/atlas/mapdata/to_zope_new.html&mapsize=428+380&map_scalebar_imagecolor=255+255+255> 

-2750564.750000 -943773.286215 3583872.500000 4680259.786215 
41953025.267029 


With 5.0.2: 

http://dev.atlas.gc.ca/cgi-bin/mapserv502atlas?map=/home/atlas/mapdata/english/105.map&map.web=TEMPLATE+/home/atlas/mapdata/to_zope_new.html&mapsize=428+380&map.scalebar=COLOR+255+255+255 <http://dev.atlas.gc.ca/cgi-bin/mapserv502atlas?map=/home/atlas/mapdata/english/105.map&map.web=TEMPLATE+/home/atlas/mapdata/to_zope_new.html&mapsize=428+380&map.scalebar=COLOR+255+255+255> 

-2750564.750000 -942941.431206 3583872.500000 4679427.931206 
42051275.911682 

That scale change is big enough to break all our min/max scale ranges and so on :( (on hundreds of mapfiles) 

I've looked through HISTORY.TXT and the Migration Guide but am not seeing anything about this (All I saw was a change in scale calculation for PHP?)

Help? 

Jean-François Doyon 
Data Dissemination Division | Division de la diffusion des données 
Data Management and Dissemination Branch | Direction de la gestion et de la diffusion des données 
Earth Sciences Sector | Secteur des sciences de la Terre 
Natural Resources Canada | Ressources naturelles Canada 
Ottawa, Canada K1A 0E9 
jdoyon at nrcan-rncan.gc.ca 
Telephone | Téléphone 613-992-4902 
Facsimile | Télécopieur 613-947-2410 
Teletypewriter | Téléimprimeur 613-996-4397 
Government of Canada | Gouvernement du Canada 

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