PROJ4, PHP and projection of a single point

[Stein Runar Bergheim]

Thanks a lot - if I had bothered to look in the sources I might even 
eventually have found it, but hey - as long as there are enough of you that 
are actually supplied with your very own brains I won't have to use my own... 
:-)

However, I am on the following plattform:
WindowsNT 4.0

Q: Could the php_proj_module be compiled with the djgpp C/CPP libraries???

Best regards
SRB



>===== Original Message From Assefa Yewondwossen <assefa at dmsolutions.ca> =====
>Hi There,
>
> I am assuming here that you use php/mapscript.
>
> There is a php/proj module available in the mapserver distribution 
(.../mapserver/mapscript/php3/php_proj.c).  This module give access to basic 
Proj4 fonctionalities. So in
>your case you colud use the functions to convert the Georeferenced 
coordinated to Lat/Long coordinates.
>
>Are you building mapserver/mapscrtipt yourself or do you download the binary 
versions ? Which platform are you on ? I am asking this so I could post the 
binary versions on our
>download site.
>
>Later,
>
>
>PS :
>
>Here is a little bit of docs on how to use it :
>
>   /*
> *         PHP PROJ4 Module
> *
> *  This is a PHP module that gives acces to basic PROJ4 projection
> *  functionalities.
> *
> * There are four functions available in this module :
> *
> * 1) pj_init : create and initializes a projection structures
> *
> *    PJ pj_init(array_of_parameters)
> *
> *    Example : $projarray[0] = "proj=lcc";
> *              $projarray[1] = "ellps=GRS80";
> *              $projarray[2] = "lat_0=49";
> *              $projarray[3] = "lon_0=-95";
> *              $projarray[4] = "lat_1=49";
> *              $projarray[5] = "lat_2=77";
> *
> *              $pj = pj_init($projarray);
> *
> * 2) pj_fwd : Performs a projection from lat/long coordinates to
> *             cartesian coordinates.
> *
> * retrun_array pj_fwd(double lat, double long, PJ pj)
> *
> *   Example :  $lat = 45.25;
> *              $long = -75.42;
> *
> *              $ret = pj_fwd($ingeox, $ingeoy, $pj);
> *              printf("geo x = %f<br>\n", $ret["u"]);
> *              printf("geo y = %f<br>\n",$ret["v"]);
> *
> * 3) pj_inv : Performs a projection from cartesian coordinates to
> *             lat/long  coordinates .
> *
> * retrun_array pj_fwd(double geox, double geoy, PJ pj)
> *
> *   Example :  $ingeox = 1537490.335842;
> *              $ingeoy = -181633.471555;
> *
> *              $ret = pj_inv($ingeox, $ingeoy, $pj);
> *              printf("lat = %f<br>\n", $ret["u"]);
> *              printf("lon = %f<br>\n",$ret["v"]);
> *
> * 4) pj_free : frees PJ structure
> *
> *  void pj_free(PJ pj);
> *
> **********************************************************************/
>
>
>Stephen Lime wrote:
>
>> The solution with MapScript and scripting languages is to use the proj4 
modules written first by
>> be and a better version was recently posted to the mailing list. Perhaps 
the folks at DMSolutions
>> could dicuss how to create a php/proj module.
>>
>> Steve
>>
>> Stephen Lime
>> Internet Applications Analyst
>>
>> Minnesota DNR
>> 500 Lafayette Road
>> St. Paul, MN 55155
>> 651-297-2937
>>
>> >>> "Stein Runar Bergheim" <runar at bergheim.dk> 02/22/01 03:05AM >>>
>> I am retreiving a set of points from a database, and am drawing them onto 
the image object of a map via a layer that is projected from lat/long to WGS84 
coordinates.
>>
>> This is easy going, my problem occurs when I want to collect a pair of 
coordinates from the map, perform an inverse projection of them and use them 
to query the database...
>>
>> Is this possible or should I try some alternate approach...
>>
>> Regards
>> SRB
>
>--
>----------------------------------------------------------------
>Assefa Yewondwossen
>Software Analyst
>
>Email: assefa at dmsolutions.ca
>http://www.dmsolutions.ca/
>
>Phone: (613) 565-5056
>----------------------------------------------------------------

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