I have two questions :
How does tile creation in geotiff improve performance and how will reading of tiled gtiff images be done?
Adding an overview to a geotiff image means we are resampling the original image to a small size and storing it with the original image so that when we are trying to read a large image, the overview will be read first and then the original image (so that reading latency is hidden).
Am I right on this? What is the point of adding more than one overview?
Can somebody explain briefly about the geotiff format?