I know I could use photoshop etc to paste together surface image tiles, but it would be easier if I could specify which tiles I wish to use for each cave and only use a large compilation when looking as the whole system I am using altitude coloured lidar images which come in 1km square tiles as does the underlying data. If I have :- # llangattock lidar data images surface cs OSGB:SO bitmap images/so2212_dtm_2m_w.jpg [0 0 21000 12000 500 500 22000 13000] # ocaf entrance bitmap images/so2112_dtm_2m_w.jpg [0 0 22000 12000 500 500 23000 13000] # ocaf entrance bitmap images/so2212_dtm_2m_w.jpg [0 0 21000 13000 500 500 22000 14000] # ocaf entrance bitmap images/so2112_dtm_2m_w.jpg [0 0 22000 13000 500 500 23000 14000] # ocaf entrance #bitmap images/so21122213_dtm_2m_w.jpg [0 0 21000 12000 1000 1000 23000 14000] # ocaf entrance endsurface If only used the last image specified. I have the 4 images joined below but for larger parts of the project its not very easy to keep changing the image or having massive image files to slow things down. Any work arounds? John