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• institutional unit, but areas not specifically related to the purpose of the institution <br />should be placed in the appropriate category. Auxiliary land uses, particularly <br />residential, commerciol and services, and other supporting land uses on a military <br />base would be included in this category. but agricultural areas not specifically <br />associated with correctional, educational, or religious institutions ore placed in the <br />appropriate agricultural category. Small institutional units, as, for example, many <br />churches and some secondary and elementary schools, would be mappable only of <br />Inrge scales and will usually be included within another category, such as Residential. <br />13. Industrial <br />Industrial areas include o wide array of land uses from light manufacturing to <br />heavy manufocturing plants. Identification of light industries -- those focused on <br />design, assembly, finishing, processing, and packaging of products -- can often be <br />based on the type of building, parking, and shipping arrangements. Light industrial <br />areas may be, but are not necessarily, directly in contact with urban areas; many are <br />now found at airports, or in relatively open country. Heavy industries use raw <br />materials such as iron ore, timber, or coal. Included are steel mitts, pulp and lumber <br />• mills, electric-power generating stations, oil refineries and tank farms, chemical <br />plants, and brickmoking plants. Stockpiles of raw materials and wnste-product <br />disposal areas are usually visible, along with transportation facilities capable of <br />handling heavy materials. <br />Surfoce structures associated with mining operations are included in this <br />category. Surface structures and equipment may range from o minimum of a loading <br />device and trucks to extended areas with occess roads, processing facilities, <br />stockpiles, storage sheds, and numerous vehicles. Spoil material and slog heaps <br />usually are found within a short trucking distance of the major mine areos and may <br />be the key indicator of underground mining operations. Uniform identification of oll <br />these diverse extractive uses is extremely di'ficult from remote sensor data alone. <br />Areas of future reserves are included in the appropriate present-use category, such <br />as Agricultural Land or Forest Land, regardless of the expected future use. <br />I6. Mixed Urban or Built-up Land <br /> The Miixed Urban or Built-up category is used for a mixture of Level I I Urban <br />. or Built-up uses where individual uses cannot be separated at mapping scale. Where <br />2.9-4 <br />