Sometimes raster data may not be in the proper orientation. When this is the case, use the Flip and Rotate tools to orient the data. The Rotate tool will turn (or rotate) the raster dataset; the pivot point of the raster is the lower left corner of the image, unless otherwise specified. The Flip tool will flip the raster dataset either vertically or horizontally.
The illustration below shows how the Rotate tool works; it depicts a raster dataset being rotated approximately 45 degrees (clockwise).

The images below show examples of raster datasets being flipped. The first example shows a raster dataset that is flipped horizontally. The second image shows a raster dataset that is flipped vertically. A vertical flip is not the same as a 180-degree rotation.
