Urban Frame Survey
Urban Frame Survey (UFS) is a regular scheme and is being conducted in phased manner over a period of 5 years. The objective of the survey is formation and updation of UFS Blocks for providing frame for selection of first stage sampling units in urban sector to conduct various Socio- Economic Surveys. For the purpose of the enquiry, the very same connotation of urban area as adopted in the Population Census is taken. Within this framework, an UFS updation exercise aims at updating the existing frame or to build a new frame in case of newly declared towns.
Each UFS block has been envisaged to be a compact area unit with 80-200 households in general and the block is bounded by well-defined, clear-cut and natural boundaries to the extent possible. The blocks are mutually exclusive and exhaustive so that the blocks carved out in any given town add up to the total area of the town. The blocks are so formed that they depict permanent landmarks and corner points; they are distinguishable from one another; and, are identifiable over time. While town is a big areal entity, UFS block is a small area unit. Striking a compromise between the two, the concept of Investigator Unit was evolved in the UFS. Investigator Unit (IV Unit) is a well-defined and clearly demarcated geographical area consisting of about 20 to 50 blocks. IV Unit maps are drawn in standard-sized map sheets. Efforts are made to provide adequate identification particulars leading to one to one correspondence amongst the towns, IV Units and the blocks.
Notional Maps are prepared for each IV Unit depicting the lanes and by-lanes more or less in the same manner as they actually occur. They also depict corner points and permanent land marks wherever feasible. Emphasis is to provide as much information as possible in the notional maps leading to identification of the blocks over a period of time. To enable clarity and standardization, Specified symbols are prescribed for the maps. Vacant area is also taken into account for considering the possibilities of absorbing the growth of habitation and population. Each of the blocks is normally classified as residential area, bazaar area, industrial area, military area, hospital area, slum area, factory area, etc. depending on the pre-dominance of habitation and allied features.
During the last UFS Phase (2007-12) a survey of more than 7000 towns including newly declared Census towns involving updation/formation of more than 6 lakhs UFS blocks was undertaken and Ladakh Region of Jammu & Kashmir state was brought under the coverage of UFS and formation of blocks in Leh and Kargil towns was carried out for the first time in the history of NSSO which would pave way for future surveys in the Region.
The new Phase 2012-17 has been initiated for updation of UFS blocks. All the IV units of UFS maps have been electronically stored and linkage of the details of blocks with the maps made. UFS maps and records on demand or supplied to Government department free of cost and to the private institution and research students on payment basis at the rate of Rs 1000 per block and Rs 500 per block respectively.