10.3 Data Collection for the List of Special Holdings

Data collection requires two types of questionnaire, one for the data collection from the area sample and the other for the complementary list of special holdings.

The questionnaire for the special holdings is usually deviced to cover more specialized information than is included in the area sample questionnaire and does not generally involve objective measurement of areas or the use of the aerial photo enlargements, which are essential features of the area sample data collection procedure. Use a different coloured paper or some readily visible mark to distinguish between area frame and list frame questionnaires.

For large holdings, that overlap several administrative areas it will be necessary to break down the information in order to conform with the desired level of estimates (province, region, etc.).

The annual or seasonal data collection for the list of special holdings can be done by the supervisors by direct interview with holders or managers, or by delivering the questionnaire to the holder with a later collection. In some countries the mail can be used for delivery and return of the completed questionnaire.