MI problem with raster image

[laurent Frilleux]

hello,   I have a problem for digitalizing roads. I have a big satellite image (7500*7500 pixels) with 4 points and error pixel is 0. When i digitalize, i have no problem, but when i change the zoom level, polylines are moving definitively and i i qo back to the initial zoom level, they are not at the rigth place.   I have try to add some points, it's better but the problem still exist I have change the projection , no change i am trying to split the image in severals.. I have reduced the bounds in the table, it's bettre but the problem still exist     thanks in advance     Laurent frilleux STRATEGIS MONTPELLIER 0467416841