Correction for the sake of the list: the tiles were being layered correctly, however MapServer background color settings to mimic the ocean made it appear otherwise (eg. IMAGECOLOR 60 100 145). The solution was to set this background color to transparent:
$transparent = imagecolorallocatealpha($image,60,100,145,127); Now that this is working I've noticed that for overlays there is a consistent SE shift of the data. Has anyone else experienced this?
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