UIDAI to conduct field survey for Enrichment of VTC (village, town, city) data

As a pilot project, UIDAI is inviting quotations from organizations, to conduct field survey in connection with Enrichment of VTC (village, town, city) data.

The Pilot projects are planned in 3 districts (Kolar in Karnataka, Krishnagiri in Tamil Nadu  piond Chittoor in Andhra Pradesh). The scope of work includes field survey / studies and mapping of every location with latitude and longitude and location images.


UIDAI is involved in the enrolment of residents for Aadhaar. One of the issues encountered in the field during enrolment is the absence of a particular village or pin-code in the enrolment client software. The UIDAI master data has been created using inputs from India Post and Census Department, which needs to be updated on the basis of latest information by conducting field survey / study penetrating up to the last level of habitation and capturing key data with latitude, longitude and images of key locations in the habitation.

It is intended to enrich the above data in the following three districts viz.

• Chittoor in Andhra Pradesh

• Kolar in Karnataka and

• Krishnagiri in Tamil Nadu

The drill-down needs to be up to the hamlets, habitations, sub-villages level (including State, District, Sub-district, Taluk, Village or Gram Panchayat).

The details that need to be captured are as follows:

  • photo of a landmark (such as a ration shop, government school, post office box, having the name of the village) in the given village
  • the latitude and the longitude (preferably as part of the photo metadata) of the village
  • the pin-code for the village
  • additional attributes (whether the village is the GP or Hobli) for the village
  • photo of the delivery post office along with latitude and longitude

Further, this data needs to be annotated daily onto digital map available on a website.


The various phases of the approach are:

 Preparation Phase

During this stage, existing data (UIDAI, Pin Code Data, Census 2011, State Revenue) inputs for 3 districts are reconciled to generate a superset list of villages. This list will contain attributes such as pin-code, village code (where available), Sub-district, etc.

This will form the basis of the field work.

Report with statistical information (such as total number of villages, number of villages that do not have a village code (such as habitations, hamlets) is generated.

A digital database that can be used for field work is created. It is advisable to distinguish between villages that appear in both the Revenue as well as Census versus those that appear in either as the latter set will need greater attention at the field level.

 Survey Phase

During this phase, the specific data is collected from the villages. Further, this data is uploaded onto say a website on a daily basis.

Apart from data collection, meetings with say the Postal department, Revenue department officials (such as Village Officer), etc. will be planned. This will help in the addition of villages

Verification of the collected data (by say retired govt. officials) is also planned.

 Consolidation Phase

During this phase, any gaps found are addressed. Additional verification will also be conducted.

The entire exercise should be completed within 5 weeks from the date of issue of LOI.


The successful agency will  have to make their own arrangements of travel, accommodation and other related logistics at the concerned places for undertaking the work.


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