Hi mcoates,
Thanks for your feedback. I use php scripts that I have written to perform the tasks. I wrote them to suit my own website and they have been updated many times along the way. They reside on the server and they are activated automatically when images or weather data get uploaded from the various aerodrome cameras and weather stations.
Thank you for your suggestions about placement of text. I have tried many configurations along the way and am open to changes. As the website is a joint effort, every host has an input into what they want on their images and how it looks. This is why on my site you will see some different arrangements between them.
Importantly the cameras only upload an image. They do not put text on them. This all happens on the server enabling me to be able to make updates without accessing the cameras themselves.
Cheers