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CADASTRAL UPGRADE PROJECTS for LOCAL GOVERNMENT A Possible Upgrade Path. Geodata Process. The Geodata process using

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slide1
CADASTRAL UPGRADE PROJECTS

for

LOCAL GOVERNMENT

A Possible Upgrade Path

© Geodata Australia

geodata process
Geodata Process

The Geodata process using

software developed by Michael Elfick with Mike Fletcher and Mimaka Pty Ltd and now represented by Geodata allows the creation of a coordinated digital cadastral database from original survey data thus preserving the mathematical integrity of the original survey observations

© Geodata Australia

it is unique
It is Unique
  • The traditional method for surveying land is to measure a precise control network and then use this to fix the position of the land parcel.
  • Geodata has followed the Elfick approach and adopted the inverse of this concept in that the land parcels are captured, joined and assembled and then analyzed to determine the amount and location of the control required.

© Geodata Australia

the background
The Background
  • The process was developed as a result of investigations and a trial conducted by the NSW Lands Department together with the Association of Consulting Surveyors and University of Newcastle to determine whether a reasonable and cost effective alternative existed to creating a DCDB from digitised topographical maps.
  • The decision was taken following the investigations to implement proposals to digitise topographical maps.
  • Michael Elfick continued developing his cadastral software – CADP in the belief that it presented a better Cadastral Database

© Geodata Australia

the background5
The Background
  • CADP as the program was then known has been used to create and manage the NCDB in the ACT and the NT (NCDB is used to differentiate between the spatially accurate Geodata cadastre from the DCDB derived from digitised topographical maps.
  • CADP has also been used in NZ, USA and The Philippines for cadastral management projects and has been successfully trialed and demonstrated in a number of Australian jurisdictions CADP has been licensed to Geodata and renamed GeoCadastre

© Geodata Australia

the esri connection
The ESRI Connection
  • Geodata and ESRI have worked collaboratively to incorporate GeoCadastre into ArcMap as an extension to Survey Analyst which will be released to international markets circa Q1 2007, in ArcGIS 9.2
  • The Survey Analyst 9.2 will allow the storage of cadastral data in a geodatabase without any loss of mathematical integrity to the survey data.
  • SurveyXML™ has been jointly developed with ESRI as an interchange format to transport cadastral data to the geodatabase.

© Geodata Australia

slide7

Maps, Plats

Field Books

Other survey

and engineering

file formats

Field

Measurements

Geodatabase

Applications

  • - Data automation
  • and maintenance
  • GIS analysis
  • Enterprise
  • mapping
  • requirements
  • - Land records
  • Surveys Information
  • System
  • Measurement-based
  • Cadastre

The ESRI Model for Application of GeoCadastre within Survey Analyst

Survey Data

(measurements)

Imagery

GIS data

Text and Paper

Documents

CAD data

© Geodata Australia

slide8

Step by Step Geodata Approach to Cadastral Upgrade

Step 1 – Collate source Deposited Plans and machine readable survey data

Step 2 – Capture and convert source data – data entry from survey plans and or electronic files

Step 3 – Identify irregularities and misclose

Step 4 – Rectify errors

Step 5 – Incorporate base cadastre with client GIS systems

Step 6 – Move Asset Layers to the Accurate Cadastre

Step 7 – Consult on maintenance of cadastral dataset

© Geodata Australia

slide9

Survey

Record

N

C

D

B

Web Delivery

Possible

Survey Plans

Built Environment

Data Delivery

to Clients

GeoCadastre Process

Data Entry

Fabric Adjusted

Parcels Joined

& Assembled

© Geodata Australia

conversion stage 1 parcel data entry
Conversion Stage 1 - Parcel Data Entry
  • Keyboard operation
  • Screen will display the lines as they are entered
  • Enter bearings distances and areas – in the plan units of measurement : calculation of close and accuracy applied by the software
  • Supervisor would check errors on regular basis and rectify as needed

© Geodata Australia

conversion stage 1 parcel data entry11
Conversion Stage 1 - Parcel Data Entry

As parcel data is entered from the keyboard the drawing appears on screen

© Geodata Australia

conversion stage 2 parcel joining
Conversion Stage 2 - Parcel Joining
  • Achieved by mouse operation
  • Parcels joined together by clicking on matching points
  • Operator checks rotation and scale precision and notes errors for supervisor rectification

© Geodata Australia

conversion stage 2 parcel joining13
Conversion Stage 2 - Parcel Joining

Parcel to be joined to the fabric is selected and common points of connection are selected

Common points on the parcel and the existing fabric are selected

Joining – Check scale, then type ‘y’.

© Geodata Australia

common points selected parcel is added into the cadastral fabric
Common Points Selected & Parcel is Added into the Cadastral Fabric

The joined parcel is added to the fabric and now appears in the parcel explorer window as joined

© Geodata Australia

conversion stage 3 adjustment assembly
Conversion Stage 3Adjustment & Assembly
  • Select known co-ordinate control points to adjust an area
  • Choose geodetic system, zone and acceptable tolerance for the adjustment based on precision of survey plans
  • Run the co-ordinate adjustment process

© Geodata Australia

conversion stage 3 co ordinate adjustment
Conversion Stage 3 – Co-ordinate Adjustment

Tolerances set

Listing file location nominated

Adjustment summary detailed

© Geodata Australia

cadastre display parameters
Cadastre – Display Parameters

Easements Roads and Parcel Lines are shown in different colours and various display parameters can be turned on and off

© Geodata Australia

the outcome
The Outcome
  • A complete parcel network;
  • A correct cadastral dataset;
  • Co-ordinate precision
  • The cadastral base layer for GIS

© Geodata Australia

slide21

Differences between NCDB and DCDB

Gross error here of 101.6m but typically in this dataset the errors are circa 8 metres

© Geodata Australia

benefits of an ncdb
Benefits of an NCDB
  • Complete, correct and precise position based cadastre
  • One common cadastre for all users
  • Elimination of duplication
  • Reduced delays for update
  • Provisional layer for planning purposes is possible
  • Unification of GIS with GPS
  • Interchangeable datasets between users
  • Reduction in labour intensive GIS conversions

© Geodata Australia

alternative gradual upgrade
Alternative – Gradual Upgrade
  • The cost of re-building a cadastre to NCDB standards from scratch is often greater than Councils are prepared and able to meet.
  • Geodata is able to assist in the alternative process of gradual upgrade to numeric standards

© Geodata Australia

progressive upgrade
Progressive Upgrade
  • Using the existing DCDB as a base, accurate cadastral data can be prepared using GeoCadastre and inserted into the DCDB.
  • The DCDB for an area is first brought into GeoCadastre through GeoSurvey.
  • The following is the Gloucester DCDB on which Geodata is currently working

© Geodata Australia

area 5 within the dcdb
Area 5 within the DCDB

© Geodata Australia

progressive upgrade26
Progressive Upgrade
  • Area 5 comprises some parcels for which reasonable plans are available but the balance is an area comprising old system titles where reasonable survey data is not immediately available
  • Area 5 is exported from MapInfo (the format the DCDB was received in) but could as easily done from ArcMap for import to GeoSurvey

© Geodata Australia

area 5
Area 5

Export from MapInfo (or ESRI ArcMap)

© Geodata Australia

converting strings to parcels in geosurvey
Converting Strings to Parcels in GeoSurvey

Inversing the DCDB parcels

© Geodata Australia

area 5 in geocadastre
Area 5 in GeoCadastre

The DCDB Converted to GeoCadastre format

© Geodata Australia

adjustment of area 5
Adjustment of Area 5

Control is applied and the cadastre adjusted without any attempt to improve accuracy

© Geodata Australia

accurate data to be appended
Accurate data to be appended

Cadastral data recorded in GeoCadastre from survey plans

© Geodata Australia

unjoining parcels ready for appending
Unjoining parcels ready for appending

Parcels comprising the accurate data are unjoined from the DCDB dataset

© Geodata Australia

appending accurate data
Appending accurate data

The survey accurate GeoCadastre dataset is appended and joined to the DCDB

© Geodata Australia

whole dataset shaded to show relative accuracy age of plans
Whole Dataset Shaded to Show Relative Accuracy (Age of Plans)

Weighting of data in the adjustment process is reflected in age of plans.

Digitized DCDB is Orange

© Geodata Australia

progressive upgrade36
Progressive Upgrade
  • It can be seen from the last group of slides how a progressive update of cadastral data can be achieved using Geodata software and process
  • The process can be dictated and controlled by Council to it’s own timetable and requirements
  • Relatively unskilled (in Survey of GIS disciplines) personnel can be used for this process

© Geodata Australia

progressive upgrade37
Progressive Upgrade
  • To enable a Council to proceed immediately with a progressive update of it’s cadastre it would need to purchase at least one seat each of GeoCadastre and GeoSurvey
  • The cost of GeoCadastre and GeoSurvey is $3,750 each per seat plus annual maintenance (optional) of $500 each which carries with it free technical support and upgrades.
  • Discounts are available for multiple purchases.

© Geodata Australia

progressive upgrade38
Progressive Upgrade
  • Geodata is also able to offer consultancy services on cadastral upgrade and management
  • Consultancy services are available from Geodata at negotiated per diem rates

© Geodata Australia

slide39
Inquiries:
  • Roger Lee

Address:

P.O. Box 574

East Maitland

N.S.W. 2323.

© Geodata Australia

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