FROM THE OFFICE OF
SURVEYOR-GENERAL
VICTORIA
ISV GLENELG GRAMPIANS GROUP SEMINAR
21 November 2013
David Boyle
Deputy Surveyor-General Victoria
General topics
• OSGV
•
•
•
Now with DTPLI
Not linked to DEPI
OSGV Operations
– major projects – SMES update
– legislation – Survey Co-ordination Regs and Cadastral Regs
• SRBV
•
A new Board
•
CRSBANZ - new “Brown Book” to set educational /university standards
• ePlan
• ICSM/ANZLIC
• Connection to MGA94 and the Practice Directives
2
ePLAN DEVELOPMENTS
ISV GLENELG GRAMPIANS GROUP SEMINAR
21 November 2013
David Boyle
Office of Surveyor-General Victoria
Plan types – Simple to relatively complex
Plan types – Simple to relatively complex
The ePlan visualiser handles simple
to medium complexity plan layouts
quite well, including showing
easements, restrictions and plans
containing owners corporation.
It also generates boundaries defined
by buildings and building returns.
Biggest challenge:
“De-clutter” labels in crowded areas
ePlan Vendors Progress Update
Vic
NSW
Autodesk (Civil 3D)

Topcon (Civilcad Magnet Office)

Geocomp & ePlan Services (GeoCivil + EPSALON)

Dev
Geodata Australia (Geocadastre )

MARC Computer Services (LandMark)

LISTech (LISCAD)
12D Solutions (12D)
ePlan Received


Dev



 SA
Dev
Dev
Dev
 NZ

Dev
Dev
Foresoft
Under Discussion:
Bentley (Microstation, GeoPak), Mapsoft (MiniCad), Trimble and ESRI
** Dev = Under Development
Other

Carlson Software (Carlson)
Keays Software
Qld
Dev

Dev

Implementation Progress
• Received 9 ePlan submissions since May 2013 – 1 registered
• Received 11 test ePlans from surveyors in the pilot program
•
Provided 3 hands-on training sessions for LISCad users
• Designing training courses for Geocivil users
• Continuing to improve the visualiser
• Working with vendors to extend their application types
Nationally – ANZLIC
and ICSM
ISV GLENELG GRAMPIANS GROUP SEMINAR
21 November 2013
David Boyle Office of Surveyor-General Victoria
The National Environment
•
Cadastral environment – currently jurisdictional
•
Digitally – C’wealth Dept of Broadband, Communications and the Digital
Economy
•
•
Office of Spatial Policy - policy unit – coordinating spatial data management,
previously under GA
•
ANZLIC – Foundation Spatial Data Framework
•
ICSM – Cadastre 2034 (PCCR), Geodetic Datum (PCG)
Other jursidictions
•
Digital cadastres – 3dQLD (reliable Spatial Info)
•
Surveyors-General – NSW, SA, TAS, NT and NZ
CHANGED REQUIREMENTS
FOR CONNECTION TO
MGA94
ISV GLENELG GRAMPIANS GROUP SEMINAR
21 November 2013
David Boyle (prepared by Eddie Cichocki)
Office of Surveyor-General Victoria
Spatial Accuracy of Map Base
• Business Case
•
(Dec 2011)
Five Options
– Do nothing (100 years)
– Resurvey the state ($425 NPV)
– Back capture and update Vicmap ($95m NPV)
– Imagery update of Vicmap ($6m NPV)
– Mixed approach of back capture and imagery and build
a new mapbase ($154 NPV)
• Since December 2011
•
•
•
Made available to the public
No commitment to/by government
ePlan
• Other jurisdictions
12
•
Australian states
•
NZ – LINZ is being updated at a cost of $90m
Main Changes
• No longer required to provide
MGA94 coordinates for PMs and
PCMs connected to and the
perimeter corners of the land under
survey.
• May need to connect to the datum
• Introduction of terminology “SCN
Mark” and “Non-SCN Mark” for
PMs and PCMs in the SMES
Database.
13
Background
• Requirement to coordinate cadastral surveys was introduced by
the Survey Practice Circular 1995 which supported the
Surveyors (Cadastral Surveys) Regulations 1995.
• The Circular and Regulations also introduced the concept of
Primary Cadastral Marks (PCMs) for the purpose of:
o
Monumenting cadastral surveys; and
o
Densifying the Survey Control Network.
• In 2000, the Geocentric Datum of Australia 1994 was
implemented and the Survey Practice Directive 2001 stated a
preference for cadastral surveys to be coordinated on MGA94.
14
Background cont.
• Following the introduction of the Surveying (Cadastral Surveys)
Regulations 2005, it was mandatory for MGA94 to be used as the
datum for coordinating cadastral surveys.
• The Surveyor-General of Victoria Practice Directives 2006
required the provision of MGA94 coordinates in the format of an
Addendum to the Surveyor’s Report.
• Since the introduction of the Addendum to the Surveyor’s Report,
parcel corner coordinates have been captured and supplied to
Logica for inclusion in Vicmap Property.
• The purpose of providing coordinates for parcel corners was to
update the state’s digital cadastral map base – Vicmap Property.
15
Parcel Corner Coordinates - 2012
• Snapshot of the accuracy of Vicmap Property based on survey
coordinates supplied in 2012.
16
Accuracy (m)
Matched Points
Percentage
≤ 0.1
3465
18.4%
0.1 – 0.5
7348
39.0%
0.5 – 2.5
6767
35.9%
2.5 – 5
644
3.4%
5 – 10
333
1.7%
10 – 25
277
1.5%
> 25
11
0.1%
Totals:
18845
100%
Reasons for Change
• Business Case for a Spatially Accurate
Map Base has recommended rebuilding
the map base using survey
observations rather than coordinates.
• ePlan.
• Non-homogeneity of PCM coordinates
(static) and adjusted PM coordinates
(semi-dynamic) in the SMES Database.
• Resources in OSGV.
• SMES 4 release in early 2014.
17
SCN and Non-SCN Marks
• The Survey Control Network (or “SCN”) is the network of survey
marks in Victoria whose coordinates have been computed from a
rigorous adjustment of observational data by OSGV.
• An SCN Mark is a PM or PCM that has adjusted:
o
MGA94 coordinates – SCN GDA94 mark; or
o
AHD71 reduced level – SCN AHD mark; or
o
Both – SCN GDA94 & AHD mark.
• A survey mark that does not have coordinates computed from a
rigorous adjustment by OSGV is known as a “Non-SCN Mark”
• Only SCN GDA94 marks are to be used for connecting cadastral
surveys to MGA94 bearing and coordinate datum.
18
Number of Marks in SMES
• There are approximately 60500 marks in SMES that are available
for connection of surveys to MGA94 (i.e. 4th Order or better).
• When SMES 4 is released, approximately 25100 SCN GDA94
marks will be available for connection of surveys to MGA94.
19
o
This will result in a reduction of the number of surveys
connecting to MGA94 datum.
o
The number of SCN GDA94 marks will gradually increase as
observations to Non-SCN marks are incorporated into the
adjustment.
o
The number of Non-SCN GDA94 marks will be approximately
162,000.
Order and Uncertainty
• Class and Order are the current indicators of precision for
coordinates.
• The new ICSM publication Standard of the Australian Survey
Control Network – SP1 Version 2.0 will provide for the transition
from Class and Order to uncertainty as the method of
expressing the quality of coordinates.
o
Uncertainty means the doubt about the validity of a position
(coordinates) and will be expressed as a standard deviation at
the 95% confidence level.
• Order will be phased-out of SMES over time and the only
indicator of the precision of coordinates will be uncertainty.
20
Positional Uncertainty
• Any SCN GDA94 mark, regardless of its Order or uncertainty, will
be able to be used for the connection of surveys to MGA94
datum.
21
Connection to the Survey Control Network
• Requirement contained in Regulation 11(1)(b), Surveying
(Cadastral Surveys) Regulations 2005 and Regulation 14(2),
Survey Co-ordination Regulations 2004 which require connection
to at least two coordinated survey or permanent marks that are:
o
Properly verified as to position at the time of survey;
o
At least 200 metres apart; and
o
Within 500 metres (radius) of the survey or a greater distance
from the survey if the connection can be made by establishing
no more than three instrument points from each permanent
mark.
• Coordinated survey or permanent mark = SCN GDA94 mark.
22
“Large” Subdivisions creating 10 lots or more
• Connection to MGA94 is mandatory for “large” land subdivisions
creating 10 lots or more.
• Surveyors must:
o
Connect to at least two SCN GDA94 ground marks (or
appropriate GNSS observation); and
o
Rotate the survey onto MGA94 bearing datum.
• If insufficient SCN GDA94 ground marks are located in the vicinity
of the survey, they will be established by OSGV upon application
to the Manager, Geodetic Survey by email to
smes.support@dtpli.vic.gov.au.
23
Other Subdivisions and Surveys
• For:
o
“Small” land subdivisions creating less than 10 lots;
o
Building subdivisions;
o
Application surveys under the Transfer of Land Act 1958;
o
Boundary Plans; and
o
Crown Surveys
• The following rules apply depending on the availability of SCN
GDA94 marks within the parameters of Regulation 14(2), Survey
Co-ordination Regulations 2004.
24
Two or More SCN GDA94 marks available
(each within 500m radius)
• Surveyors must:
o
Connect to at least two SCN GDA94 ground marks (or
appropriate GNSS observation); and
o
Rotate the survey onto MGA94 bearing datum.
SCN GDA94
MGA94
LUS
SCN GDA94
25
SCN GDA94
One SCN GDA94 mark available
(within 500m radius)
• Surveyors must:
o
Connect to that SCN GDA94 ground mark (or appropriate
GNSS observation); and
o
Connect to at least one other PM or PCM to satisfy Regulation
11(3), Surveying (Cadastral Surveys) Regulations 2005; and
o
Adopt a bearing datum in accordance with title or a previous
cadastral survey or plan.
New PCM
Unregistered PM
LUS
26
Non-SCN
SCN GDA94
No SCN GDA94 marks available
• Surveyors must:
o
Connect to at least two PMs or PCMs to satisfy Regulation
11(3), Surveying (Cadastral Surveys) Regulations 2005; and
o
Adopt a bearing datum in accordance with title or a previous
cadastral survey or plan.
New PCM
Unregistered PM
LUS
27
Non-SCN
Previous connection to SCN GDA94 marks
• A nearby earlier survey can be used for MGA94 bearing datum
provided it:
o
Derived its MGA94 bearing datum from a connection to two
SCN GDA94 ground marks;
o
Was performed by the same surveyor or survey firm; and
o
Was completed within the last five years.
• In this case, surveyors must:
28
o
Connect to at least two PMs or PCMs from the earlier survey
that are at least 200 metres apart; and
o
Rotate the survey onto MGA94 bearing datum.
Permanent Marks
• Where new PMs are established or existing unregistered PMs are
found and connected to in a cadastral survey, surveyors must:
o
Obtain an allocated number for the PM using SMES;
o
Quote that number where appropriate on the survey
documents; and
o
Prepare a PM Sketch Plan and lodge it with the SurveyorGeneral within one month;
• Where new PCMs are established, surveyors must:
29
o
Assign a number to the PCM from the series of numbers preallocated to each licensed surveyor by the Surveyor-General;
and
o
Quote that number where appropriate on the survey
documents.
Connection by Networked Real-time GNSS
Observations
SCN GDA94
Rover
P1 (t1)
Networked Area
•
•
•
30
Rover
P2 (t2)
Rover
Verification of coordinates on at least one SCN GDA94 ground mark. Variation of
horizontal component of the coordinate difference with SMES coordinates not to
exceed 0.10m
Control points (PMs and PCMs) are to be established by at least two independent
occupations separated by at least 20 minutes i.e. t2 - t1 > 20 min
Horizontal component of the differences of the control point positions, i.e. P2 - P1,
must not exceed 0.05m
MGA94 Bearing Datum by Real-time GNSS
Observations
P1 (t1)
Networked Area
P3 (t3)
Rover
Rover
P4 (t4)
LUS
Rover
•
•
31
P2 (t2)
Rover
MGA94 bearing datum is to be derived from the independent occupations
of two PMs or PCMs in the survey at least 200 metres apart.
Derived connection to SCN GDA94 ground mark used for verification
purposes is to be shown on the Abstract of Field Records.
Connection by Real-time GNSS Observations
from a Single GPSnet Reference Station
SCN GDA94
Rover
GPSnet
Reference
Station
P1 (t1)
Rover
P2 (t2)
Rover
• Same procedure as for Networked Real-time GNSS Observations.
• Distance from control point to GPSnet reference station not to
exceed 20 kilometres.
32
Real Time Kinematic using Own Base Station
Rover
Mean Shift
SCN GDA94 PM
Base
SCN GDA94 PM
SCN GDA94 PM
Rover
• Where at least two SCN GDA94 ground marks are available,
MGA94 datum is to be derived from a best-fit with the SMES
coordinates of the PMs.
• If insufficient SCN GDA94 ground marks exist in the vicinity, the
survey may be placed on MGA94 bearing datum as derived from
the GNSS observations.
33
General Comments on GNSS
• Surveyors must ensure they follow ‘best practice’ GNSS
observation techniques.
o
Standards and Practices for Control Surveys (SP1) available at
http://www.icsm.gov.au/geodesy/sp1.html
o
Provision will exist in SMES 4 for this data to be uploaded for
inclusion in the network adjustment.
• Licensed Surveyor’s Report to include details of the GNSS
equipment and methodology used in the survey.
o
34
Also to include the comparison between GNSS and SMES
coordinates of the SCN GDA94 mark as proof of verification.
Summary
35
•
Cadastral surveys are no longer to be coordinated (effective as of
today).
•
SMES 4 will designate survey marks as “SCN” and “Non-SCN” marks.
•
Only SCN GDA94 marks are to be used for connection of cadastral
surveys to MGA94 bearing datum.
•
The quality of the coordinates of SCN marks will expressed as
uncertainty.
•
All PMs and PCMs connected to in a survey are to be numbered.
•
Surveyors are encouraged (?urged) to connect to Non-SCN marks and
unregistered PMs within the bounds of a survey.
•
Requirements for derivation of MGA94 bearing datum by GNSS
observations remain practically unchanged.