doc:appunti:linux:sa:debian_11_12_mapserver_upgrade
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doc:appunti:linux:sa:debian_11_12_mapserver_upgrade [2023/11/23 17:48] – niccolo | doc:appunti:linux:sa:debian_11_12_mapserver_upgrade [2023/11/23 18:11] (current) – [MAP:TRANSPARENT not longer valid] niccolo | ||
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+ | ===== MAP: | ||
+ | |||
+ | In MapServer 8 mapfiles the **TRANSPARENT** identifier is not longer accepted inside the MAP object, you have to move it into the **OUTPUTFORMAT** object; something like this: | ||
+ | |||
+ | < | ||
+ | OUTPUTFORMAT | ||
+ | NAME agg_png | ||
+ | DRIVER " | ||
+ | MIMETYPE " | ||
+ | IMAGEMODE RGBA | ||
+ | EXTENSION " | ||
+ | TRANSPARENT ON | ||
+ | END | ||
+ | </ | ||
+ | |||
+ | ===== Name change of CGI parameters ===== | ||
+ | |||
+ | One of the biggest problem of the upgrade is the change of the name of some CGI parameters; notably the **map_size** option is not longer supported. | ||
+ | |||
+ | I had web application based on OpenLayers 2.11, which included a MapServer bitmap layer. The JavaScript code automatically generates the request URL, something like this (parameters are split on different lines for readability): | ||
+ | |||
+ | < | ||
+ | / | ||
+ | & | ||
+ | & | ||
+ | & | ||
+ | & | ||
+ | & | ||
+ | & | ||
+ | & | ||
+ | & | ||
+ | & | ||
+ | </ | ||
+ | |||
+ | Unfortunately the **map_size** option is not longer accepted and the resulting PNG image has the default size declared into the MAP:SIZE object of the mapfile, instead of the requested 1446x2274 pixels. This causes a **totally distorted map** image into the web application! | ||
+ | |||
+ | This problem cannot be easily fixed, because the URL options are hard-coded into the OpenLayers code. So I had to replace all the OpenLayers 2.x code with the current **OpenLayers 8.x**, which required a total refactory of the code. | ||
+ | |||
doc/appunti/linux/sa/debian_11_12_mapserver_upgrade.1700758118.txt.gz · Last modified: 2023/11/23 17:48 by niccolo