The necessity of solving a number of methodological tasks is substantiated, aimed at ensuring the objectivity of estimating the visual, measuring and information quality of materials for remote sensing the Earth on the basis of test sites. The results of generalization of the accumulated practical work experience on creating test sections, which are formalized as a methodological approach to creating a priori data base for assessing the space survey materials quality, are presented. As part of the proposed methodological approach to arranging a priori data base for assessing the Earth remote sensing materials quality, a set of issues related to the requirements for selecting test sites, sampling and justification of test objects at sites, determining the characteristics of these objects, the content of the test site, requirements to the site passport and passports of test objects, to the content of the database in the form of a geoinformation system of the test site is reflected. The urgency of developing a network of test sites for control, calibration and estimating the quality of the obtained materials from space survey systems, the main elements of which are typical objects of natural and anthropogenic origin, is substantiated. A set of issues related to maintaining the test sites up-to-date is considered.