INTRODUCTION 
1. Purpose 
It is the purpose of this article to present a review of the 
state of the art, of recent achievements, and of trends for the 
near future, 
2. Scope 
The review is limited to survey navigation in aerial photography 
and to airborne serigor orientation. | 
The innovations and the possibilities of data collection from Spacecraft 
will be treated by dr. F. Doyle, in this same symposium. 
3, Outline 
The most significant aspects of the state of the art today = in the 
second half of the 'seventies — are 
a. that ERTS/Landsat imagery has shown to be useful as a basis for 
contact navigation, particularly for small scale photography; 
b. that programmable pocket calculators and minicomputers are being 
dedicated to the solution of survey navigation problems; 
c. that advanced self-contained precision navigation equipment is 
becoming available, programmed specifically for aerial survey, 
as reliable mass products. 
4. Expectations 
Several methods have been developed and are being improved for use 
in the near future. 
Operational tests areunder way to compare and 
to evaluate 
. the degree of accuracy, and 
pele (^ C 
. the operational suitability for aerial survey. .— LACH 
j It is expected that actual comparative performance data will be 
available at the Congress of the I.S.P. in 1980. Li eh 
—€——— NE RARE EE