[Chameleon] tiff hang

Paul Spencer pspencer at dmsolutions.ca
Tue Dec 7 10:53:20 EST 2004


to debug drawmap.php, you need to grab the URL from the image in the 
chameleon app and load it directly in your browser.  You should then see 
any error messages or debug output directly.  Often, problems with a 
broken map image are related to error messages (or notices) being output 
before the image contents, thus creating a corrupt image.

If nothing shows up immediately on viewing the drawmap.php url, you can 
then start to add some debugging code (echo) to drawmap.php to try to 
discover what is going on.



Ken-ichi wrote:
> Hi list.  A while ago I posted an issue I'd been having with rendering 
> TIFFs in Chameleon 
> (http://lists.maptools.org/pipermail/chameleon/2004-August/thread.html#1245), 
> but I never really resolved it.  Essentially, whenever I zoom in on a 
> GeoTIFF so that the TIFF fills the whole map, Chameleon hangs and never 
> displays the map image (I just get the spinner icon indefinitely and 
> then a broken image icon behind it.  Try zooming in on the DRG (Test 
> Raster) at
> http://fisher.cnr.berkeley.edu/vtm/data/mapbrowse/
> to see what I'm talking about.  I'm fairly sure this is a Chameleon 
> issue, most likely with drawmap.php, because this mapfile renders just 
> fine via the CGI, and with a rudimentary phpMapScript app like this one:
> http://fisher.cnr.berkeley.edu/~kueda/mapscript_browse.phtml
> The DRG is a 16M GeoTIFF from the California Spatial Information 
> Library, so I don't think it's to blame.  You can check out my php and 
> MapScript config at
> http://fisher.cnr.berkeley.edu/~kueda/phpinfo_mapscript.phtml
> I'm running MapServer 4.4.0, GDAL 1.2.5, and PHP 4.3.9.  Can anyone 
> think of a reason this could be happening, or recommend a way to 
> troubleshoot drawmap.php?
> -Ken-ichi
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> Chameleon at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/chameleon

|Paul Spencer                           pspencer at dmsolutions.ca   |
|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|

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