Brazilian Quality Control Systems for Digital Photogrammetry Mapping Production

This paper discusses a quality control system developed to be applied to the digital photogrammetric process for Brazilian spatial data production. The developed quality control system is directed to aerial surveying companies and at same time it can be used as guidelines for specifications for photogrammetric products like aerial triangulation, DTM, orthophoto and mosaic generation, data collection and so on. It is based on quality management standards ISO 9000 and in the Swiss Standards Guidelines and the others. In order to detect the main problems arising during the photogrammetric products production, several aerial surveying companies as well as their customers were asked to participate in a surveying. In this way a significant part of the difficulties of photogrammetric products had been identified and analyzed and correction have been proposed to meet customers and company expectations. The main sources of errors are identified and analyzed in order to be corrected or reduced in the control quality system. During research some specific problems had been found, as for instance, quality control on the image acquisition process. In that case, the probable causes in the process had been investigated for the inclusion of corrective actions. Also, each step of the process was investigated and controlled in order to obtain individual quality parameters that, collectively, are able to assure the quality of the final product, mostly considering aspects of precision and accuracy requirements for mapping production based on the customer’s expectations. One of the main functions of the developed control quality systems is for implementation of the corrective actions in the procedure of production process.