Maps are used in planning, preparing the frames, organizing and conducting the field data collection and presenting and analyzing results. This chapter presents an overview of cartographic preparations for an agricultural census or survey in order to guarantee adequate coverage, precision and presentation of the collected data. Maps used for statistical purposes include topographic charts, aerial photography, satellite imagery and even sketches prepared to facilitate data collection when no other materials are available.
Cartographic materials are costly and their elaboration requires time and special skills.
Statistical maps should be based on the cartography carried out by specialized agencies. Most mapping preparations depend on the quality of the basic topographic cartography of the country. The cartographic units of statistical offices must then improve, update and make those maps adequate to be used for specific needs. A permanent cartographic programme for statistical purposes covering agricultural censuses and surveys is a very important tool for increasing the accuracy, timeliness, and usefulness of census and sample survey results. Introduction 5.1 Maps are used to produce more accurate, timely and useful statistical data.