Color transparencies are ideal for slide presentations and color publications.
Good photographs provide records and reference sources of basic soils information.
It is necessary to plan early in the soil survey to begin taking photographs. Photographs that include a scale are useful in estimating volume, area, or size distribution. The comparison of coarse fragments in a soil against photographs of known quantities of coarse fragments improves the reliability of estimates. Similar photographic standards can be used to estimate volume or size of nodules and concretions, mottles, roots, pores, and rock fragments. In like manner, photographic standards can be used in estimating area or the special arrangement of surface features and land use.