The stripes rotate as zoom level changes
Is there an option to stop this effect?
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It only takes a minute to sign up.Sign up to join this community
This is most likely a moire interference pattern caused by regular patterns in the data and the regular pattern in the pixels on your screen - thus the pattern changes depending on zoom.
Building ‘pyramids’ for your raster image should solve the problem, creating appropriate intermediate zoom images. Pyramids don’t affect the values of the base image - they’re simply there to help your GIS display the data more quickly and, in this case, accurately.
Open up the layer properties and select 'pyramids':
Select (using shift for multiple selections) all the zoom levels in the list on the right. Select an appropriate resampling method - 'gauss' seems to work well for most rasters I've worked with, but experiment:
After clicking OK it may take a little while depending on the size of the raster, but afterwards you'll be able to zoom without the moire effects appearing.
This persists for the current project only as far as I know, unless you choose 'internal' pyramids - however, that runs the risk of damaging your original raster file (which I have seen happen!).