proj - PHP Map projections -


i have googled myself death.. attempting write 2 php functions return x , y lat , long, in both mercator , flat non-projected (grid) maps. problem being every calculation have ran across assumes map(s) has same lat , lon @ corners, , result in meters. ugh

here have .. maps of different sizes, different lat's, long's @ 4 corners. downloaded proj4 php port, 0 documentation , more code need, on whelmed ...

help !!

this presumes lat/long coords decimal values, , don't change direction north/south or east/west within visible range of map. if do, such values should kept single format, , made negativel (eg: 1.0 s become -1.0 n)

first you'd set following variables, either finding them php or if know them in script:

$width=//width of image $height=//height of image  $long_at_left=//longitude of left-hand coordinates $long_at_right=//longitude of right-hand coordinates $lat_at_left=//latitude of left-hand coordinates $lat_at_right=//latitude of right-hand coordinates  $target_long=//longitude want find $target_lat=//latitude want find

then use:

$xtarget=$target_long-$long_at_left; $ytarget=$target_lat-$lat_at_top;  $xdist=$long_at_left-$long_at_right; $ydist=$lat_at_top-$lat_at_bottom;  $x=round(($xtarget/$xdist)*$width); //percentage of distance times width $y=round(($ytarget/$ydist)*$height); //percentage of distance times height

or of form should trick.


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