![]() Benchmarks are located at various points along the streets for future references using fly leveling. In each sector map, the details of each street, name of street, road networks joining streets, name of the roads etc. In this case also, the whole city area is split into number of parts and each part is surveyed using plane table. Preparation of street map is very similar to topographic map preparation but in this case the map is prepared with large scale as compared to the scale of topographic map. Finally maps of all sectors are bring together to make it as a one map which gives the topographic details of whole city area. In the map, the nature of ground is indicated by different markings or colorings or hatchings etc. then contour survey is conducted using tachometer method or plane table method. ![]() If there are any depressed areas like valley’s, lakes and high-rise areas like hills etc. On the whole area some important points or constant points are noted and reduced levels (RL’s) are arranged at that points. Plane table surveying is conducted in each sector and interior details like roads, parks, lakes etc. In each sector, closed traversing is conducted using theodolite. Each sector is enclosed by a polygon which are having a connection on common sides. In the preparation of topographic map, the whole area on which a township is going to build is divided into number of sectors. Preparation of Different Maps for a City Topographic Map Preparation Ranging rods, pegs, optical square, arrows etc.Instruments for Surveying City or Townshipīefore discussing the preparation of maps, we must know the instruments used to conduct city surveying and they are ![]() Surveying is conducted for each system by their concerned departments or authorities. Proper maps should be prepared for each of the systems of the city during surveying such as:Įach map should be prepared in such a way that a person can easily locate the required point in the map. Water Supply and Sanitary Map Preparation.Preparation of Different Maps for a City. ![]() Instruments for Surveying City or Township. ![]()
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