In remote sensing and image interpretation, shape is one of the most fundamental visual elements used to identify and classify objects.
The shape provides information about the general form, outline, or external structure of features such as buildings, roads, rivers, and other landforms.
Experienced photo interpreters rely on familiar shapes to distinguish between man-made and natural objects.
For example, rectangular or geometric shapes often indicate human-made structures, while irregular shapes may represent natural features like forests or water bodies.
Understanding shape, combined with other elements like size, tone, and texture, helps achieve accurate interpretation of aerial photographs and satellite images.
Therefore, Shape correctly fills the blank.