Sometimes your raster data may not be in the proper orientation. When this is the case, the Flip and Rotate tools can help you orient your data in the manner you want it to be displayed. The Rotate tool will turn (or rotate) your 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 being flipped vertically. A vertical flip is not the same as a 180-degree rotation.