1h 
Key strips are flown North and South along each 
otography are flown East and West joining these key 
ol is established at the ends and centre of each key 
lar position in the centre of the area 
and values used for further triangula- 
of latitude is considered as a "unit. 
edge whilst other parallel strips of ph 
strips. Horizontal and vertical contr 
strip with three additional control points in a simi 
Aerotriangulat ion is then carried out on key strips 
tion of the East - West runs. 
Observations from aero-triangulat ion of the strips are adjusted mathematically 
and after examination of such results a simultaneous ‘adjustment of the strips as a block 
is made by semi-graphical means, Tt is claimed that this method makes full use of the 
stereo plotting equipment in reducing the amount of ground control,at the same time giving 
an accuracy of Xtlh,5 yards. 
For details of adjustment by this method see Annexure E, 
After aerotriangulation is carried out, stereoplotting is done by Wild A6 and A8 
and Multiplex equipment, 
In addition to the standard topographical map it is the intention of this Depart- 
int of the cadastral pattern. 
ment to produce another edition which includes an overpri 
raphical map an indepehdent compilation 
Before fair drawing takes place a 
ancies from the two sources examined, 
During the compilation stage of the topog 
is made of the cadastral surveys of the same area. 
comparison of the two sheets is made and any discrep 
ompilations have been prepared for developmental 
Several of these projects have been mapped at 
highway design in the metropolitan 
investigating and planning 
Numerous large scale contoured c 
projects using large scale photography. 
100 ft, to 1 inch with 2 ft contours for the purposes of 
area and 4 inches to 1 mile with 10 ft and 20 ft contours for 
of dam sites, hydro-electric schemes and forestry projects, 
mapping unit covering each 
The Central Mapping Authority is a self-contained 
and lithographic re- 
aspect of air survey, field survey, photo compilation, fair drawing 
production, 
Department of Lands and Survey, Victoria, 
arrange for aerial photography of 
In 1944 an Aerial Survey Branch was formed to 
the various State Government 
the state and prepare topographical mapping as requested by 
Departments. Photography of those areas not covered by Commonwealth photography was 
arranged by private contract and to date the whole of the etate is covered, Initial 
photography was flown using Williamson Eagle IV camera fitted with Ross 8% inch lens at 
scale of 1:158L0. Rephotography is now being carried out as required for mapping and 
other purposes using Williamson OSC and Eagle IX cameras fitted with Ross 6 inch wide angle 
lens and Wild RC5 camera fitted with an Aviogon 4% inch wide angle lens, A Wild RC7 plate 
camera fitted with an Aviotar 6.7 ineh lens is used for photography of small areas required 
for special purposes. Tt is the intention on any new mapping project to rephotograph the 
area by private contract, 
Photo maps conforming to the same regular boundary as the topographical maps, are 
compiled of all medium scale photography. These maps are reproduced after being suitably 
annotated at scales of 1 inch to 1 mile and 4 miles to 1 inch, There is complete coverage 
of the state by this type of photomap. 
In the early days of the formation of this braneh 1000 square miles of topographie 
mapping was produced at 1:21680 with formlines, This has now been superseded by the 
standard topographical map series at scale of 1:31680 with 50 feet contours which also 
shows the cadastral pattern, To date 1800 square miles of this series has been published, 
ictoria have the National Geodetic Survey 
With few exceptions most areas of V 
when additional control is required 
within reasonable distance of any mapping activity and 
extensions are made from this primary network. 
Photography is flown in areas measuring 30 minutes of longitude by 15 minutes of 
Tie strips are flown along the western and eastern edges and the centre of 
latitude. 
Parallel strips are then flown east and west joining these tie strips. 
this area. 
tie strip and, with suitably 
Control is established at the ends and centre of each 
ed out on each of 
spaced intermediate heights, aerotriangulation by the Wild AD ie carri 
these strips. From adjusted values of points common to keyruns and cross strips a bridge 
with Multiplex, using additional heights, is established on these east - west runs. An 
alternative method is to use stereo-templates, After adjustment, plotting of detail and 
contours is carried out by Wild A6 or the 3 projector Multiplex Mapping Equipment. 
e scale mapping in areas where develop- 
To meet the requirement of supplying larg 
LOO feet to 1 ineh with 5 or 10 ft 
ment will take place, a base map series at a scale of 
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