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STATISTICAL TEST FOR EVALUATION OF THE ACCURACY OF DIGITAL MAPS FOR GEO-SPATIAL 
INFORMATION SYSTEM 
Prof. Bock-Mo Yeu 
Dept. of Civil Engineering, Yonsei University 
Prof. Hyun Kwon 
Dept. of Civil Engineering, Suwon Technical University 
Researcher Seok-Kun Lee 
Dept. of Civil Engineering, Yonsei University 
Researcher Dong-Bin Shin 
Korea Research Institute for Human Settlements 
Commission II, Working Group 5 
KEY WORDS: Statistics, Production, Accuracy , Quality, Project, Geo Spatial Databases 
ABSTRACT 
Digital maps of Geo-Spatial Information System are very important as they are the foundation of the system and the necessity to 
implement and develop digital map database is increasing . But because of various different needs and requirement of different 
users, each has different needs of accuracy. A standard for statistical test for accuracy evaluation such as the hypothesis test is 
very essential under such changing environment. In this study a statistical method for evaluating accuracy of digitized maps is 
introduced . Using hypergeometric distribution and considering consumer risk and producer risk, a statistical method was used to 
decide the optimal sample size. 
1. INTRODUCTION 
In Korea, with the development and growing interest of Geo- 
Spatial Information System, the need for standards in digital 
maps are being discussed and frameworks are being 
established by government bodies such as the National 
Geographic Institute. Meanwhile maps are being digitized, 
trying to satisfy the standard as much as possible. It is well 
known that the database implementation cost comprises most 
of any GSIS projects and reports have been made that some 
amounts up to 8096 of the whole project implementation 
cost( K.Thaph, J.Bossler, 1992). Big cost for initial 
production also implies big cost for editing and correction of 
erroneous data and sometimes irreparable damages. All these 
means that everything has to start with the correct data from 
the initial stage. Despite this emphasis on the importance of 
411 
accurate data, the importance of the quality of data from the 
producer and the consumer point of view is not getting enough 
attention. 
Topographic base maps are directly produced in digital format 
nowadays by using analytical stereo plotters and test points are 
selected from the produced maps and compared to ground 
surveying results and residuals are computed and used as an 
evaluation factor for the map. Although effective, due to extra 
costs involved in the testing procedure producers tend to look 
for other methods of evaluation. Also researches are done 
recently to evaluate the classification accuracy of thematic 
maps by statistical evaluation and sampling method using the 
binomial distribution, considering the risk of both the 
consumers and producers (Michael E, G., 1979) (G.H. 
Rosenfield et. al., 1982) (S.Aronoff, 1982). Despite these 
efforts more researches should be done on the evaluation of 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996