Relief Inversion
When looking at aerial and satellite imagery, telling the difference between a canyon and a mountain can sometimes be tricky due to an optical illusion known as relief inversion.
GPS and a Grader Bring Back the Maree Man Geoglyph in Australia
The Marree Man is a geolyph located in the Australian Outback. A geolyph is an image or a picture that is a design in the earth, and it is usually made of natural materials.