21.25 ft eon-
ing of desert
ping using
is shown.
lense pattern
oh ise tied the
n Multiplex
Owing to
zing for
zhts have ‘been
che 1: 250,000
im to complete
xenibly. Con-
nomi cal
arried out and
3 Generally
Longitude by
superimposed
Sheets and,
od through
sketch masters.
sights where
apping is under-
at a scale of
r departments
Adopting a
5.and 10. feet
ising William-
> immediately
an produce a
tment in 1911,
artially covered
nately half
fitted with
itted with Ross
nas been at a
fitted with
the intention
pographical
ion of which
to 1 mile for
PS. In
the cadastral
oc 1 degree of
17
longitude by 30 minutes of latitude, Three key strips are flown on the western, centre
and eastern edges of this area whilst the usual parallel cross strips are flown to cover
the area,
Three groups of ground control are established on each key. strip, one group at
each end and another in the centre, Bridging by means of a Cambridge Stereo-comparator
is carried out between this ground control enabling co-ordinates of selected pass points
common to both key and cross strips to be computed, Using the values of these points
further bridging is observed on cross strips.
After adjustment of each strip a final block adjustment is made graphically and
values are transferred to Wild and Williamson Multiplex Equipment for subsequent plotting.
Details of a pre.iminary report on this method of adjustment with some results
on accuracy and time factors are given in Annexure F,
Another topographical map series published by this department is at a scale of
I miles to 1 inch. This covers the whole of the State and has been compiled from exist-
ing information gathered from all sourees, gaps in any information being supplied from
county charts and aerial photography.
Large scale topographical mapping is also undertaken for various departments
using large scale photography flown by Wild RC5 camera, Plotting is by Wild equipment of
which this department has acquired one A7 Autograph and three A8 Stereo-plotters, Some
of this mapping has been : 10 chains to 1 inch with 20 ft contour for city development
and town planning and at the same scale with 10 ft contours for water conservations small
isolated areas at hOO ft to 1 inch with 10 ft contour .for hydro-electric purposes, Some
planimetric mapping has been compiled at JO ft to 1 inch for road re-alignment and a map
at 200 ft to 1 inch is to be prepared for the Highways Department.
This Department has no facilities for the reproduction of mapping.
Hydro-Electricity Commission of Tasmania
The Hydro-Electricity Commission of Tasmania has a small photogrammetric staff
to supply the mapping requirements of their department in the investigation and design of
vater storage and hydro-electric power.
Photography is flown by private contract using a Wild RC7 camera at a scale of
1:5000 for subsequent plotting by their Wild A7 Autograph.
Terrestrial photography is also plotted for the investigation and design of dams
in the steep gorge country of the state,
examples of mapping carried out using this equipment has been at scales of
hOO ft to 4 ineh with 2 ft contours for general storage reservoirs; 100 ft to 1 inch with
2 to 5 ft contours for general plan constructions and 20 ft to 1 inch with 2 ft contours
for dam design,
Private mapping organisation
oh there are only a small number of private mapping organisations operat ing
on a contract basis in Australia, the activities of those engaged on this work are satig-
factorily fulfilling a role in the supply of mapping to their various clients,
Adastra Airways Pty.Ltd.
his company is the main agency for flying of aerial photography in Australia
ea, They commenced operations prior to World War II and have since been
‘aged in meeting the demands of aerial photography from most of the mapping
Australia, As an indication of their activity in this field it is estimated
: t time, this company is photographing 100,000 square miles of country
To carry out this task this company possesses the following aircraft with the
necessary ancillary equipment: 2 Avro Ansons, 3 Lockheed Hudsons, 1 Douglas Dakota and 1
Catalina (fc geophysical vork only); cameras used beino Williamson Eacle IX, OSC and
Wild RC5 using Ross 6, 8i, 10 and 12 inch and Wild Avioson li ineh lens, In addition,
they have the facilities for processing negatives and duplicating prints.
Since 1948 this company in addition to their aerial survey activities, have con-
tracted to supply various types of topographiesl raprin”. To carry out this plotting they
have acquired four 7 projector and two 3 projector Williamson Multiplex Equipments plus a
Wild A7 Autcgraph which hac been used to map for some of the following contracts :-
5C00 square miles at ! inches to 1 mile with 50 ft contours using Mult iplex for Snowy Moun-
tains Scheme; 50 ft to 1l inch vith 2 ft contour usinr the 47 Autograph for design of road
