[mapserver-users] PHP Mapscript and projection 3857

[Lars Schylberg]

Hi, I am not using PHP Mapscript, but shouldn't You set the extent to 
valid EPSG coordinates for EPSG:3857.  IE. Projected bounds:
-20026376.39 -20048966.10
20026376.39 20048966.10

for global coverage.

/Lars S.

Den 2020-09-20 kl. 18:32, skrev magma:
> Hi all.
>
> I have used PHP Mapscript for a few years to render static images of 
> maps, from data I have in PostgreSQL/PostGIS. A simplified example of 
> my code looks like this:
>
> <?php
>
> $this->map = ms_newMapObj('');
> $this->map->selectOutputFormat('png');
> $this->map->imagecolor->setRGB(56, 112, 192);
> $this->map->setextent(-180, -90, 180, 90);
> $this->map->set('width', 1000);
> $this->map->set('height', 600);
>
> $layer = ms_newLayerObj($this->map);
> $layer->setConnectionType(MS_POSTGIS);
> $layer->set('name', 'world');
> $layer->set('type', MS_LAYER_POLYGON);
> $layer->set('status', MS_ON);
> $layer->set('connection', "host={$this->postgis['host']} 
> port={$this->postgis['port']} dbname={$this->postgis['db']} 
> user={$this->postgis['user']} password={$this->postgis['pass']}");
>
> // $layer->set('data', "geom FROM (SELECT id, geom FROM 
> osm_country_polygons) AS a USING UNIQUE id USING srid=4326");
> $layer->set('data', "geom FROM (SELECT id, ST_Transform(geom, 3857) AS 
> geom FROM osm_country_polygons) AS a USING UNIQUE id USING srid=3857");
>
> $class = ms_newClassObj($layer);
> $style = ms_newStyleObj($class);
> $style->color->setRGB(160, 160, 160);
> $style->outlinecolor->setRGB(48, 48, 48);
>
> header('Content-Type: image/png');
> $image = $this->map->draw();
> $image->saveImage();
> ?>
>
> Using SRID 4326 works great (the commented line). However the line 
> below, which is enabled, using 3857 does not work. It renders an all 
> blue image (/$this->map->imagecolor->setRGB(56, 112, 192)/).
>
> Is it not possible to change the projection, or do I need to set an 
> option in the layer or map object? I have tried to read and Google 
> this for some time now, but whatever I try seems to fail for me.
>
> Most thankful for a good hint/solution.
>
> // Magnus
>
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