3 
tional plotting work is performed usually either by the depart- 
mental team of photogrammetric specialists which includes three 
graduates of the I.T.C. Some minor project plotting is done in- 
house. Typical scales for preliminary investigation of route lo- 
cation are 1:4 000, with a five-metre contour interval, for ru- 
ral design 1:2 000, with a two-metre contour interval, for urban 
design 1:1 000 or 1:500 with one-metre or half-metre contours, 
while orthophotos are also used in urban areas at 1:1 °000 or 
1:500. 
Digital Photogrammetric Products 
Equipment includes a ZEISS (Jena) Stereometrograph "D" with Coor- 
dimeter and IBM cardpunch, a WILD A.10 Autograph with Shaft en- 
coders online to an IBM 1130 computer and with feedback through 
a CRT Display Screen and other peripherals. A Gerber flatbed data 
plotter is available. Other photogrammetric equipment includes a 
WILD PUG4 Point Transfer Device. 
Digital output is used for strip triangulation purposes and for 
such tasks as the assessment of earthwork quantities moved on ma- 
jor construction contracts. As part of the programme of photogram-. 
metric research, a paper was presented to the Seventeenth Austra- 
lian Survey Congress in Melbourne in 1974 under the title: "Ca- 
dastral Surveys by Photogrammetry" (T. M. Clark & C. A. Woodham) 
describing an approach to the cadastral survey on a freeway pro- 
ject using photogrammetric methods. Gridded digital data extrac- 
ted from contour plans has been used for location optimisation 
using a suite of programmes developed by Dr D. W. Bennett of the 
University of Melbourne and known as OPTLOC. Dr Bennett is a con- 
sultant to the Department and is continuing development of the 
OPTLOC suite on departmental location investigations. 
Limited usage has been made of string digital ground model data 
for earthwork assessment purposes, with a view to incorporating 
relevant procedures into the routines of highway design, but litt- 
le progress has yet been made in implementing these procedures. 
Digital mapping procedures are also contemplated and liaison is 
maintained in that context with the Highways Department of South 
Australia. 
colour Photography and Remote Sensing 
Most aerial photography used for photogrammetric measurement pur- 
poses is exposed as colour negative and reproduced in the form of 
colour transparencies for instrumental observation. Colour prints 
and enlargements are used as appropriate, while black-and-white 
reproductions are used in other circumstances, for instance for 
Strip mosaic compilation. Colour reproductions are widely used by 
those responsible for environmental studies and geological inter- 
pretation. Research is proposed in the use of multi-spectral ima- 
gery for the location of gravel deposits in the blacksoil plains 
of western New South Wales and for other purposes. 
Country Roads Board, Virginia 
  
Photogrammetric services are provided to the Country Roads Board 
ew Es uas - = 
cones