-— 17 — 
As regards equipment, nearly all of the organisations (97%) had computer 
facilities available and the majority (61%) had coordinate registration devices. 
Furthermore, identical figures were reported for the number of doonoids having © a 101 
their own aircraft, having comparators and having orthophoto equipment, namely 
25% in each case. 
All of the organisations had plotting equipment, the total distribution of the 
various types being: automatic plotters (1%), universal instruments (13%); j 
precision plotters (33%) and topographic plotters (53%). 1 
There was, of course, a significant variation in this distribution from one ^ 
organisation to another e.g. the proportion of types of plotting instruments 
- 
Li 2. 1. 11411 
held by two large government agencies in one country were respectively 82% 
topographic plotters and 87% precision plotters. 
1 
Main activities of mapping agencies 
  
Mapping agencies appear to be predominantly occupied with line mapping, the 
distribution of the various types of end products being as follows: 
line maps 81%, photomaps 12% and digital data 7%. The majority of these line 
maps were left in the form of pencil plots. 
With respect to the photomaps, approximately half were produced from orthophotos e m 
and the other half by means of rectification (i.e mosaies). The majority of 
photomaps produced were not annotated. 
Finally, an equal distribution was reported between digital data produced with 
and without a graphical plot. 
To complete this preliminary investigation, an attempt was made to establish the 
relationships between a number of project parameters. Figs 1, 2 and 3 below 
illustrate the relationships between on the one hand the map scales employed 
and on the other hand respectively the photo scales, the contour intervals and 
the total production rates for the various product types. 
PHOTO SCALE 
1000001 
7 
E . 
4 
100004 : 
Lf td 
. 
  
  
FEI tree T —rrrrrre MAP SCALE 
T 
9 
o 
2 
v 
1000007 
Pis. 1 Mapscale vs. photo scale