A Rural Subdivision in the Northern
TerritoryNeville L. Brayley LS
April 2015
What does a 2 Lot Subdivision in the NT bush look like?• Large• Hot• Things want to kill or hurt you• There are lots of those things• There are two seasons – the Wet and the Dry – both are hot• 4 wheel driving is a given• Quad bikes are a given• GNSS equipment is a given• Geodesy is relevant (who would ever have thought Rod Deakin’s
dissertations actually mattered in real life?)• It’s large, hot & things really do want to kill you
Large
Similarities• Some jobs like we have in Western & North Western Victoria• A few hundred acres, or maybe a thousand + acres occasionally• Some river boundaries• Some ocean boundaries• They are mostly all bush, not much pasture grazing• In the NT we produce a Survey Plan & a Surveyors Report
LargeDifferences• The wet makes fords, creeks and rivers totally un-passable at times• Sometimes you can’t get to jobs. Or get home!• It can be a very long drive to a job – sometimes all day• A tidal range of about 7 metres• Mangroves and mud flats along the ocean and rivers• Things live in those mangroves – they move quicker than you – and want to
kill you• Stock are mustered with helicopters• Areas are spoken about in square kilometres• Land tenure is often quite different to what we know here• When the client shows you around the job, he does it in his plane!
What is large?
• If a Victorian surveyor had a rural job where one lot was 95ha and the other 112ha, they would consider that a pretty big job
• In the one I have just completed one lot is 95,000ha and the other 112,000ha.• The entire southern boundary is the Daly River – about 50km of river
frontage• And things in it want to kill you
Large
• Tipperary Station• About 250 km south west of
Darwin• Title area is over 2,100 Sq. Km• The size of a small country
Large
The components of the survey• Get all of your survey search• Mobilise• Reconnaissance – plane and vehicle• Construct all of your permanent marks (knowns as CRMs in the NT)• Do the Static network• Do AUSPOS observations (log while doing RTK in excess of 6 hours)• Look for cadastral marks• Cadastral Survey – pick up old marks, posts, new marks, pegging• Comps, reports and plan production
GNSS Equipment – Static Session Planner
GNSS Equipment – Static Observation Key Diagram
GNSS Equipment – Static Logging & Booking Sheet
GNSS Equipment – Network Diagram showing distances
GNSS Equipment – TBC Software Screen Shot
GNSS Equipment – Static & AUSPOSThings to lodge with the Plan to the Surveyor General• Static Logging Sheet• Network Control Diagram• Network Adjustment Report• Adjusted Co-ordinate list – MGA94 and Lats & Longs• Technical Report detailing field and office processes and
demonstrating adherence to regulated accuracy requirements• RINEX data for the static network• RINEX data for the AUSPOS determinations
Geodesy is Relevant
In the NT when doing large jobs two items that Surveyors have to adhere to I find extremely interesting• When pegging a line of Latitude, you MUST put a bend in the line
every 10 kilometres!• When calculating final plan areas you MUST adjust the area using the
Large Area Misclose formula
Geodesy is Relevant
The Final Plan of Subdivision
• This was only a 3 sheet plan• The plan numbering system is different to Victoria's, as is their
method of having multiple sheets in a plan• Nearly all plans are currently drawn at A1• Like Victoria, there are many subtleties relating to the drawing and
presentation methods. But they can be quite different so a whole new learning curve• In rural areas the bearing datum MUST be “True Mid”. There’s that
geodesy stuff again – you get forward and reverse bearing differences on east/west lines. The longer the line, the greater the differences.
The final areas were:•NT Portion 7347 = 95,370 ha•NT Portion 7348 = 112,400 ha
Sheet 2 Created Daly River Road
Sheet 3 was the new boundary. Between the Daly River Road & the Daly River
Sheet 3 was the new boundary. Between the Daly River Road & the Daly River
Surveying Territory Style
all in a hard days yakka
Rural Surveying is heaps of fun
Neville Brayley
Top Related