Distinguish between the following: The quarter-inch and the one inch sheets as drawn by the Survey of India.
The Survey of India used systematic arrangements to draw topographic maps. In quarter-inch maps, each sheet extends over 6° of longitudes and 4°of latitudes in which elevation is shown in meters. In quarter-inch maps, a scale of 4 miles is taken to an inch. It is also known as a one-in-million sheet map.
On the other hand, when the degree sheets sub-divided into 16 equal sheets, each representing an extent of 15'. These smaller sheets are termed as one-inch sheets. It shows the scale of one inch to a mile.