Secondary sources: published and unpublished

Detail

What secondary data are

• Secondary data are data that someone else has already collected. The user did not collect them. The user takes them from published or unpublished records.
• Primary data are the opposite. You collect them yourself, first-hand, through a field survey, an interview, a questionnaire or by measuring something.
• Published source: a record that has been printed or put online for the public, such as a report, yearbook, bulletin or website.
• Unpublished source: a record that is kept in an office, file or register and is not released to the public. Examples are a patwari's land register and a company's internal files.
• The same table can be primary data or secondary data. It depends on who uses it:
• For the Census office, which counted the people, a Census table is primary data.
• For a student who copies that table from a Census report, it is secondary data.

Published sources: the six groups

Group	Who publishes	Examples
1. Government	Union and state governments	Census of India, NSS reports, IMD weather reports, state Statistical Abstracts, District Bulletins, commission reports (Fig. 1.3)
2. Semi- or quasi-government	Bodies set up by government that run partly on their own	Urban development authorities, municipal corporations, zila parishads
3. International	UN bodies	UNESCO, UNDP, WHO, FAO; Demographic Yearbook, Statistical Yearbook, Human Development Report (Fig. 1.4)
4. Private	Newspapers and private organisations	Yearbooks, surveys, reports
5. Newspapers and magazines	Press	News reports, data stories
6. Electronic media	Websites and portals	The internet, mainly government and UN data portals

1. Government publications

• Census of India: published by the Office of the Registrar General of India.
• It counts the whole population: its size, age, sex, literacy, work, housing and migration.
• The first Census was taken in 1872. Since then it has been held about every ten years (a decennial census).

• It is the main source for population geography in India, down to the village and town level.

• National Sample Survey (NSS) reports:

• The NSS has collected data from households in India since it began in 1950 [2].
• It is a sample survey. It does not visit every home. It visits a carefully chosen sample of homes and uses them to estimate figures for the whole country.
• Today the National Statistics Office (NSO) runs large household surveys, usually in rounds that last one year or six months [2].

• NSS rounds have covered consumption spending, employment, health, migration and many other social and economic topics [2].

• IMD (India Meteorological Department) weather reports: daily, monthly and seasonal data on rainfall, temperature and the monsoon. Climatology studies use them.

• State Statistical Abstracts: yearly books of figures for each state, such as area, crops, industry and population.
• District Bulletins: data and descriptions for each district.
• Commission reports: reports of commissions set up by the government. They often contain large data tables.

2. Semi- or quasi-government publications

• Quasi-government body: an organisation set up by the government by law that runs partly on its own.
• Examples:
• Urban development authorities, such as a city's development authority. They publish master plans and land-use data.
• Municipal corporations. They publish city data on water supply, waste, roads and housing.
• Zila parishads. These are district-level panchayats. They publish rural development data for the district.

3. International publications

• These come from UN bodies such as UNESCO (education, science and culture), UNDP (development), WHO (health) and FAO (food and agriculture).
• Key yearly publications:
• Demographic Yearbook (UN): the UN Statistics Division has collected official figures for it from national statistical authorities since 1948. Each year it sends questionnaires to over 230 national statistical offices [3].
  • It gives yearly figures on population size and make-up, births, deaths, marriage and divorce [3].
  • Special issues cover topics such as economic activity, education, households, housing, ethnicity and language [3].
• Statistical Yearbook (UN): general social and economic figures for the countries of the world.

• Human Development Report (UNDP): ranks countries by the Human Development Index (HDI). The HDI is a single score built from three things: health (life expectancy), education and income.

• For an Indian student, these reports are always secondary and published.

4. Private publications

• Yearbooks, surveys and research reports brought out by newspapers and private organisations.

5. Newspapers and magazines

• They report fresh data, such as rainfall, floods, crop output and election results.
• Use them carefully. They often repeat official figures, so it is best to check the original source.

6. Electronic media, especially the internet

• Today the internet is the biggest source of secondary data.
• Government and UN bodies now put their reports and data tables online. Examples are the Census, MoSPI/NSO, IMD and UNSD.
• These online data are still secondary and published.

Unpublished sources: the three groups

Group	Kept by	Examples
1. Government documents	Offices at village, tehsil and district levels	Village revenue (land) records kept by the patwari
2. Quasi-government records	Municipal corporations, district councils	Development plans and reports
3. Private documents	Companies, trade unions, organisations	Company records; records of trade unions, political and non-political (apolitical) bodies, and residents' welfare associations (RWAs)

1. Government documents and the patwari's records

• Patwari: the village-level revenue official. The patwari keeps the land records of the village.
• Revenue (land) records show:
• who owns each plot of land;
• the plot's area;

• land use, such as which crop was grown and whether the land is irrigated.

• These are the most detailed data on land use and farming at the village level. They are kept in registers and are not published as reports. That makes them unpublished secondary data.

• Modern change: going digital
• The National Land Records Modernisation Programme began in 2008. It aimed to digitise written and map-based land records and to modernise registration and survey systems [4].
• In 2016 it was merged with the existing schemes for computerising land records and registration. Together they became the Digital India Land Records Modernisation Programme (DILRMP) [4].
• By January 2026, about 99.8% of records of rights had been computerised. About 97.4% of cadastral maps had been digitised [4]. A cadastral map is a map that shows the boundaries and owner of each land plot.
• Progress on modern record rooms was lower, at 72.5% [4]. In Sixth Schedule areas of Assam, Meghalaya, Tripura and Mizoram, digitisation is harder because land is often owned by the community [4].

2. Quasi-government records

• These are the development plans and reports of municipal corporations and district councils that have not been published.

3. Private documents

• Examples are the records of companies, trade unions, political and non-political organisations and residents' welfare associations.
• They are useful for small, local studies, such as a study of the workers in one factory or the households in one colony.

How to classify a source: the two-step test

• Step 1: who collected it?
• If you collected it yourself → primary.

• If someone else collected it → secondary.

• Step 2: if it is secondary, is it released to the public?

• If it is released in print or online → published.

• If it stays in a file or register → unpublished.

• Examples:

• Census report used by a student → secondary, published (government).
• A patwari's khasra register (the register of plots) used by a researcher → secondary, unpublished (government).
• A Human Development Report → secondary, published (international).
• A residents' welfare association's member list → secondary, unpublished (private).
• Your own household questionnaire → primary.

Prelims Hooks

• The Census of India is published by the Office of the Registrar General of India. The first Census was taken in 1872.
• The NSS began in 1950. It uses sample surveys of households, not a full count. Today the NSO runs it in rounds of one year or six months [2].
• The Human Development Report is published by UNDP. It is not published by the World Bank or the UN Statistics Division.
• The UN Demographic Yearbook has collected data from national statistical offices since 1948. It covers more than 230 offices [3].
• Municipal corporations, zila parishads and urban development authorities are quasi-government sources, not government sources.
• Village land revenue records of the patwari are a government, unpublished source. Trap: they are not primary data for a student who uses them.
• Records of trade unions and residents' welfare associations are private, unpublished sources.
• DILRMP was formed in 2016 by restructuring the 2008 National Land Records Modernisation Programme [4].
• Trap: the same Census table is primary for the Census office and secondary for a student.

Mains Points

• Planning needs good secondary data.
• The Census and the NSS give data for India down to the village and household level.
• Plans for housing, jobs and migration depend on these data.

• Gaps or delays in these surveys weaken planning based on facts (GS-I population and settlement; GS-III planning).

• Land records link geography and governance.

• Old, paper-based patwari records lead to land disputes and to delays in mutation (updating the record after a sale or inheritance).

• DILRMP has computerised about 99.8% of records of rights (Jan 2026). But record rooms, re-surveys and the linking of land records with maps are still incomplete [4].

• Limits of secondary data.

• Different sources may use different definitions, years and units. They may also be biased, for example in private or newspaper reports.

• So a geographer must check the original source and make the data comparable before processing it.

• Internet portals have made data more open.

• Official and UN data are now easy to reach online, for example through the UN Statistics Division [3].
• This helps studies across regions and across countries. Even so, unpublished local records are still needed for studies at the village level.