[Mapserver-users] convert pixel to world (georeferenced) coordinates

[woodbri at swoodbridge.com]

I put it here:

http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?PHPMapscriptSnippet1

linked off the Examples section of:

http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?PHPMapScript

-Steve W.

On 4 Apr 2003 at 10:56, Steve Lime wrote:

> If not done already, this snippet should be added to the WIKI...
> 
> Steve
> 
> >>> <Antti.Roppola at brs.gov.au> 04/02/03 10:31PM >>>
> 
> Here's a little one that I wrote for PHP/Mapscript:
> 
>  function click2map ($click_x, $click_y, $current_extent) {
>   global $map;	
> 
>   $x_pct = ($click_x / $map->width);
>   $y_pct = 1 - ($click_y / $map->height);
> 
>   $x_map = $current_extent[0] + ( ($current_extent[2] -
> $current_extent[0]) * $x_pct);
>   $y_map = $current_extent[1] + ( ($current_extent[3] -
> $current_extent[1]) * $y_pct);
> 
>   return array($x_map, $y_map);
>  }
> 
> GMap has a much fancier one, but I have got by OK.
> 
> current_extent is an array of current XMin, YMin, XMax, YMax.
> 
> Cheers,
> 
> Antti
> 
> 
> 
> -----Original Message-----
> From: Matt Doggett [mailto:mdoggett at coas.oregonstate.edu] 
> Sent: Thursday, 3 April 2003 11:08 AM
> To: mapserver-users at lists.gis.umn.edu 
> Subject: [Mapserver-users] convert pixel to world (georeferenced)
> coordinates
> 
> 
> I noticed that most mapscript functions require x,y in georeferenced
> coordinates.  However, I also noticed there are NO functions that will
> translate the img_x,img_y (pixel) coordinates that the user clicked on
> the image into georeferenced coordinates.  Can  anyone provide
> pointers on how this translation can be done?
> 
> Thanks,
> 
> Matt
> 
> Matt Doggett
> Spatial Climate Analysis Service
> Oregon State University
> 316 Strand Ag Hall
> Corvallis, OR 97331
> (541)737-9153
> mdoggett at coas.oregonstate.edu 
> 
> 
> 
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