107 
The above discussed examples show the advantage of orthoprojec 
tion* Not only are the production time and the cost reduced but 
also the length of the production period# A line map of an 
extensive area produced by the stereoplotting technique is 
available only two years after the photoflight [3], when a 
photomap can be delivered to the user after about six months# 
as Related to Instrumentations# Papers for Intern#Symp# on 
Orthophoto Technique, Krakdw 1974« 
Ducher G#, Some Aspects of Orthophotography in Prance# 
Papers for Intern# Symp# on Orthophoto Technique, Krakow 1974* 
Krauss G#, Pape E#, Experience in the Production of 1:5000 
Photo Maps in North Rhine Westphalia# Papers for Intern# 
Symp# Orthophoto Technique, Krakdw 1974# 
ci ortofotomap /Analys of the photographical and geometrical 
features of the orthophotomaps/# Prace Komisji Gorniczo-Geode- 
zyjnej PAN# Oddzial w Krakowie /w druku/# 
References 
[l] Dubuisson B#, Various Economic Aspects of Orthophotography 
Sitek Z#, Analiza fotograficznych i geometryeznych wîaéciwoé- 
Voss P#, The production of 1:5000 Orthophoto Maps in North 
Rhine Westphalia NOV# Nachrichten ans dem öffentlichen 
Vermessungsdienst Northrhine - Westphalan 1/1968#