a. Built-Up Areas.
(1) A built-up area is a large continuous area which is developed or is in the advanced stage of development for occupancy by concentrated populations. It usually is laid out in a definite street pattern and normally contains a business or industrial district. Since all buildings cannot be shown individually, the area is indicated by an overall screened red tint.
(2) Only landmark buildings are shown individually in built-up areas. These are buildings which are prominent because of size, location, or usage, such as government or public buildings, colleges, schools, churches, hospitals, railroad stations, markets, factories, and buildings of historical or cultural interest.
(3) Within the general outline of the built-up area, individual symbols are used and the built-up area tint is generally omitted for the following features:
(a) Parks and cemeteries equivalent to or larger than one block.
(b) Institutions such as colleges, schools, and hospitals possessing open ground areas equivalent to or larger than one block.
(c) Section with little construction or development if equivalent to or larger than two blocks.
(4) All woodland cover is omitted in built-up areas.
b. Native Settlements. These include native settlements in foreign areas in which the buildings are not usually of permanent construction. Kampongs in southwestern Asia and encampments in western Africa are examples. The symbol legend of the map defines the symbol properly.
c. Buildings in General.
(1) Conventional symbols are used to show a small building or a small structure similar to a building. The symbol is shown in correct orientation and its center usually coincides with the correct location of the center of the structure.
(2) Buildings and similar structures whose plotted size exceeds the conventional symbols are shown in correct orientation and shape and usually in correct location.
(3) Buildings and structures located along roads are shown in their correct location unless they would then fall within the road. In such cases, the symbol is moved back.
(4) In many cases it is impossible to show all buildings because of congestion. The map retains the general shape and pattern of the area and omits the less important buildings.
d. Structures Similar to Buildings.
(1) These are features of substantial construction not definable as buildings. In many instances they are roofed, although not necessarily enclosed on all sides. The term includes barns, grandstands, railroad sheds, large open sheds, fruit packing sheds, snow sheds, open-air refineries, and similar structures.
(2) Structures which are smaller than the average dwelling in the locality are not shown.
(3) In foreign areas, when information is unavailable, no distinction is made between buildings and structures similar to buildings.
e. Schools and Churches.
(1) When a building is used both as a church and a school, it is symbolized as a school.
(2) In the United States, the church symbol is used commonly for all denominations. On maps of foreign areas, this symbol usually denotes a Christian place of worship, with other symbols being used to denote places of worship of other sects. In such cases, the marginal symbol legend should be consulted for detailed information.
(3) When a school has numerous buildings, the flag symbol is shown only on the administration building or the most prominent building in the group.
(4) When there are numerous religious buildings in a group, as in a convent or monastery, the cross symbol is shown only on the building used for religious services or the most prominent building in the group.
f. Ruins. Ruins are buildings or structures in such a state of dilapidation or decay that they can no longer be used for their original purpose. Ruins which are smaller than the average dwelling in the locality are not shown unless they possess unusual significance.
g. Symbols. The following contain the approved symbols for buildings and populated places on large-scale maps.
