International Journal of Digital Earth The International Journal of Digital Earth, jointly published by Taylor & Francis Group, is the official academic publication of the International Society for Digital Earth.
The soil texture triangle is one of the tools that soil scientists use to visualize and understand the meaning of soil texture names. The textural triangle is a diagram which shows how each of these 12 textures is classified based on the percent of sand, silt, and clay in each. Note: these percentages are based on the USDA definition of sand and silt only. Follow these steps to determine the textural class name of your soil sample: 1) Determine the percent sand of your sample and find that number on the bottom of the triangle. Note that the numbers read from right to left, not left to right.
Also known as videokeratography, corneal topography is a process for mapping the surface curvature of the cornea, similar to making a contour map of land. The cornea is a clear membrane that covers the front of the eye (See Anatomy of the Eye) and is responsible for about 70 percent of the eye's focusing power.orneal topography is used in the diagnosis and management of various corneal curvature abnormalities and diseases such as: 1  Keratoconus, a degenerative condition that causes a thinning of the cornea. 2  Corneal transplants. 3  Corneal scars or opacities. 4  Corneal deformities. 5  Fitting contact lenses.