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DATA COLLECTION TECHNIQUES

Discover the differences between census and surveys, various types of surveys, sampling methodologies, survey tools, statistical terms, and remote sensing techniques. Understand how to collect and process qualitative and quantitative data efficiently.

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DATA COLLECTION TECHNIQUES

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  1. DATA COLLECTION TECHNIQUES

  2. Data & its types Census Vs Survey Types of survey Survey tools Sampling & its types Conclusions Scheme of Presentation

  3. Data Information Numerical form

  4. Types of Data Different criteria Rawdata/processeddata Quantitative/qualitative Discrete/continues Univariable/multi-variable Primary Vs Secondary

  5. Census Vs Survey • Less time • Less cost • Less labour • More accurate • Only method

  6. Types of Survey Primary Survey – Two Parties Surveyor/Investigator/Invigilator & Respondent Field Survey – Single Party + Instruments Secondary Survey?

  7. Survey tools/Methods Questionnaire Schedule Observation Interview Telephone Email SMS etc

  8. Important statistical terms Population: a set which includes all measurements of interest to the researcher (The collection of all responses, measurements, or counts that are of interest) Sample: A subset of the population

  9. Sampling • The process of drawing a number of individual cases from a larger population • A way to learn about a larger population by obtaining information from a subset of a larger population • Example s….

  10. Types of Sampling Probability and Non-probability sampling Probability sampling • Simple (Unrestricted) Random Sampling • Complex (Restricted) Probability Sampling: Some times offer more efficient alternatives to Simple Random Sampling b. Stratified Random Sampling c. Multistage Sampling a. Systematic Sampling d. Convenience Sampling • e. Cluster Sampling

  11. Non-probability sampling • Purposive Sampling • Quota Sampling • Snowball Sampling • Convenience Sampling

  12. Remote Sensing & GIS • ERDAS IMAGINE • Arc GIS • Arc View GIS

  13. Sample Frame

  14. Location and Altitude of Sample Villages

  15. GROUND TRUTHING LOCATIONS

  16. GROUND TRUTHING LOCATIONS

  17. DIGITAL ELEVATION MODEL Source: Generated from contour map of Lidder catchment

  18. Degradation of dense forests from the year 1992 (left) to 2010 (right)

  19. Agricultural area in 1992 (left) changed into horticulture (right) in 2010

  20. a b Agricultural area converted into horticulture in the year (a) 2001 (b) 2005

  21. Conclusion A sample could only be representative if a proper sampling procedure is employed.

  22. Thank you

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