Any literary or numerical information or expression about the required geographical topic or fact is called Data . And the act of collecting numerical or literacy description of statement or fact related to the study area is called Data Collection .
Observation , interview , questionnaire , schedule are the traditional method of primary data collection , while GIS , Remote Sensing , Satellite imageries , areal photoshops are the modern technique of primary data collection . Secondary data are collected either in published or in unpublished form.
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