© Geodata Australia Data Entry in GeoCadastre A brief introduction to the data entry process in GeoCadastre illustrating the benefits and efficiencies

© Geodata Australia

Data Entry in GeoCadastre

A brief introduction to the data entry process in GeoCadastre illustrating the benefits and efficiencies of grouping parcels either by survey plan or some arbitrary selection.

Parcels remain grouped and are joined as a group


The JobI have selected a multi parcel plan –

Deposited Plan 10443 dated February 1921

3 more recent subdivision plans have been added to introduce additional control to the whole. The parcels they replace are marked as “Historical” but retained.

The plan is fairly easy to read, well drawn and includes 28 rural parcels, roads, creek traverses and a partly digitised creek

Parcel accuracies vary from 1:17,000 to 1:73,000


DP10443(1)


DP10443 (2)


Job Setup and StartThe first action on running

GeoCadastre is to setup a

job by entering

relevant basic information

about the job


Job Settings Entered

Set the essential job detail


Set Parcel PropertiesPlan date

is a required

field and a default will

be inserted if one is not recordedDetails can be edited later


Beginning Data EntryAs the

parcel lines are entered

they are drawn

on the screenLines

comprising the road are coded “21”

as this generates cross road

connections


Cross Road Connections

Cross road connections are inserted

by the program by

entering road width at every

point that a line code 21

changes direction


Parcel is Checked for Close and Accuracy


The Grouping Process

The previous lot remains on the screen

The new parcel spreadsheet appearsThe new parcel is started at an

existing point on the previous parcel.This is repeated where possible and

data entry of new lines is performed from the keyboard as shown on the following slide


Next Parcel AddedThe next parcel in

theGroup is added starting from a

point on the

previous parcel


This Process is Repeated for all the Parcels in the Plan


The Completed Group

The groupcan now be adjusted by

LSAand saved as an entity so

It can be joined as a

single unit to the adjoining

Cadastral fabric


The LSA

Control is selectedTolerances to be observed are setThe fit of the parcels to the control is

checked – residuals displayedThe LSA is run andThe LSA result and report examined

and accepted or rejected for further error correction


Control Selected

Active control

points are displayed in

red and residuals

indicate “fit” to control.

Non-conforming control is

made inactive


Tolerances for LSA Set

Tolerances at which the LSA will terminate

Plan structure may be

preserved following LSA

Location of LSA report file is set

Click “Proceed” to run the LSA

Tolerances at which the LSA will terminate

Plan structure may be

preserved following LSA

Location of LSA report file is set

Click “Proceed” to run the LSA


LSA Run and Report Generated

The reportgives

maximum shifts

of the co-ordinate

values and identifies

points where errors exist


Check Following LSA

After the LSA

the residuals in the active

control points

should be 0


Forcing Plan Structure

The LSA recalculated the co-ordinates of every point

This can have the effect of moving points from lines which are meant to be preserved

The structure of the plan can be preserved at the completion of the LSA.


Co-Ordinate Values & Plan Dimensions

It is important to note here that the purpose of the LSA is to calculate the co-ordinates of each point.

At no time does GeoCadastre change any of the survey observations recorded from the survey plans

Survey data is preserved unaltered for all time. Historical plans are included in the LSA


Example of Forcing Plan Structure

11//10443

110//831726

10//10443

Point 180 has been

identified in the LSA as a

line point being 0.252m

off the line (boundary

between Lot 11 and Lot

10) which is not intended

by the surveyor to be

the case


Forcing Plan Structure

By forcing the plan structure Point 180

can be forced

back onto the line it

was moved from

during the LSA


Point Moved to Line

The LSA is run again and Point

180 is moved back onto the line


Orient to Image

A creek runs through the parcels and only parts of it have been fixed by survey – Lots 3A, 3B and part of Lot 7

We can link the cadastre to an image of the creek (plan or air photo) and

Digitise the creek giving it an accuracy value of 7 so it is excluded form the LSA


Orient to Image

As the creek is to be digitised it is of visual importance only – it has no mathematics associated with it and is shown for clarity only

We will therefore attach the digitised creek to Lot 16 only although it could be repeated for each individual lot affected


Start with DP10443.acs

Lot 16 is selected from the parcel

explorer window and

image window

called and the path to the image file – must be .bmp

(the DP) is set


Image File is Displayed

The image file is brought in behind the job


Orient to Image

Orient to Image is selected from the

drop down ZOOM Menu


Orient to Image

The image is now

scaled to the job by the program to allow points on the job to be matched with points

on the image


Orient to Image

Points on the image are then

matched to the same

point on the job and

residuals give a

measure of how well the 2 fit then hit

“Accept”


Image and Job are Oriented

The image and the job are

now oriented so the

creek can be

inserted by digitising


Adding the Creek PArcel

We can now create a

separate lot representing

the creek which we

will attach to Lot 16 and

create solely with mouse

clicks


Digitising the Creek

By zooming in on the

image for a better view the creek

position can be digitised with mouse clicks and the parcel line details

are calculated

by the program


Digitising the Creek

By this process the

creek is recorded

according to the image

used


The Creek Parcel Joined

Normal join

routines can now

be employed to join the

creek “parcel” to Lot 16 so it

appears on all

affected parcels


The Result of the Process

In the example above all the lots on a plan have been entered as a group

Adjusted by LSA Identified errors and areas of bad

dataForced rigour of the geometrySaved as a complete unit



The cadastral data recorded is now available for incorporation into an existing fabric or

For use as the base of a new fabric which can be built upon and added to

THE OBSERVED SURVEY DATA IS PRESERVED UNALTERED AND UNAFFECTED BY THE LSA


Adding Parcels by Appending

In the next example an adjacent plan will be recorded in the same way DP10443 was entered by grouping the parcels.

This plan will be saved as a separate entity and joined to DP10443 by appending the completed file


DP 11823

Joins DP10443

to the east


DP11823


Entry of Easement

The pipe line

easement is

recorded on the

plan as a centreline and width

only


Generating Geometry from Easement Centreline

After entering

the centre line a tool

is employed

to generate the lines

either side of the

centre line


Creating Easement from Centre Line

The bearings of

the lines intersecting

the easement Ø and the easement width and type are recorded


Easement Boundaries Created

The program

has inserted the lines

forming the easement

through the parcel


Grouping is ContinuedAfter

recording the

easement the

grouping process is continued. Note the need to

record the easement

as an unclosed

parcel


DP11823 Completed

DP11823 completed adjusted

and saved ready to append


The Append Process

Having entered the detail from DP11823 and

Adjusted it to local control by LSAWe need to begin the process of

building a cadastral fabric byAppending DP11823 to DP10443


Open the Base File

The previously

saved cadastral file DP10443 is

opened


Select the File to Be Appended

Browse to the file for DP11823 and select the desire

options


DP11823 is now in the Parcel Explorer for DP10443

Now that the

parcels for

DP11823 are in the

parcel explorer

for DP10443 the 2 can be joined


Joining the 2 Groups

When any of the

DP11823 lots is

selected for joining

all the parcels in the group

are selected

and common

points from the plan are

connected

Residuals at each

join point check the accuracy of the fit


Joining of the 2 Datasets is Complete


The Combined Datasets are now Adjusted by LSA


Adjustment Results Examined and Accepted

The 2 datasets

have been joined and adjusted and are

now ready for either

joining to a larger

group or being

added to



2 separately constructed cadastral fabrics have been joined to form a single dataset

By grouping as you go the process of joining is greatly simplified

By adjusting small areas iteratively it is easier to identify and rectify data errors


The GeodataESRI 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.


CAD dataText and PaperDocuments

- Data automation and maintenance- GIS analysis- Enterprise mapping requirements- Land records

- Surveys Information System- Measurement-based Cadastre

Maps, PlatsField Books

Geodatabase Applications

GIS data

Imagery

Survey Data(measurements)

Field Measurements

Other surveyand engineering

file formats

Other surveyand engineering

file formats

The ESRI Model for Application of GeoCadastre within Survey Analyst


Inquiries: Roger Lee Address: P.O. Box 574 East Maitland N.S.W. 2323. Email:

[email protected] Tel: 02 4922 5088 Fax: 02 4964 4789 Mobile: 0407 333 078