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v. FME Worldwide User Conference - Vancouver. Sep. 21-22, 2006. Building Polygons – the QA Way Bob Janowicz, GIS Innovations, Vancouver, BC. Y. X. A. 1. 2. Z. A Simple 6 Zone Map. Starting with a CAD file that looks like this Donuts Y inside X with X inside A

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Sep 21 22 2006

v

FME Worldwide User Conference - Vancouver

Sep. 21-22, 2006

Building Polygons – the QA WayBob Janowicz, GIS Innovations, Vancouver, BC


A simple 6 zone map

Y

X

A

1

2

Z

A Simple 6 Zone Map

  • Starting with aCAD file thatlooks like this

  • Donuts Y inside Xwith X inside A

  • Bad line between1 & 2 – double label

  • (yellow) no label

  • Label (Z) no area


To build clean areas

To Build Clean Areas

  • Lets review this simple workbench

Lines/Polygon

Point/Attribute

Integration


4 phases of processing

Y

X

A

1

2

Z

4 Phases of Processing

  • Validate linework

    • Merge lines

    • Unused – unclosed lines

  • Validate polygons

    • Examine holes and donuts

  • Extend attribution

  • Validate labels

    • Areas with NO labels

    • Areas with multi labels

    • Labels with NO areas


Building clean areas

Building Clean Areas

  • Line and area (donut) processing

Lines/Polygon


Clean linework

Clean Linework

  • Merge Linework

  • Find Unused Lines

Y

X

A

1

2


Trans linejoiner

Trans: Linejoiner

Merge Lines

** Report NON Lines **


Trans areabuilder

Trans: AreaBuilder

  • Transformers:

    • AreaBuilder or

    • PolygonBuilder

  • Treat UNUSED_LINEas a fault – to find/fix

Y

X

A

1

2


Understand areabuilder

Understand AreaBuilder

  • 3 modes Create Donuts/Drop Holes

    • Yes - No - Drop Holes


Areabuilder donuts

AreaBuilder DoNuts

Create Donuts =

Yes

No

DropHole

Overlaps

Drops holes

1:1


Understand polygonbuilder

Understand PolygonBuilder

  • Builds each polygon without regard for holes

  • Can go to DonutBuilder next…


Understand donutbuilder

Understand DonutBuilder


Admin zones

Admin Zones

  • One answer for each location

  • AreaBuilder: Create Donuts = YES


Small zone filter

Small Zone Filter

  • Coast of BC

  • Donut Islands

  • Remove small ones

  • Re overlay


Getting labels

Getting Labels

  • Getting the labels then extending and cleaning up the attributes

Point/Attribute


Get labels

Get Labels

  • Get CAD labels – ensure they are text

    • GeometryFilter: keeping only type=text


Coordinate attributes

Coordinate Attributes

  • Get Coordinates (curr Projection)

  • Replicate into new fields (Lat & Long)

  • AttributeReprojector

    • Reprojects the values in newFields (eg. Lat & Long)


Attribute cleanup

Attribute Cleanup

  • AttributeRenamer

    • To adjust names

  • AttributeKeeper

    • To get rid ofunwanted junkattributes


Final qa and polygon

Final QA and Polygon

  • Integrating and QA Areas and Labels

Integration


Link labels areas

Link Labels & Areas

  • The magic moment

    • Overlaying labels

    • Onto areas

    • NOTE the use oftracking overlap count

+ X


Labels w no area fault

Labels w/ NO Area fault

  • Test the POINT feature to ensure it has one and only one “overlap”

Z


Labels in areas faults

Labels in Areas Faults

  • AttributeFilter to test the AREA feature

    • IF overlaps=0 then the area has NO Label

    • IF overlaps > 1 then the area has EXTRA labels


We did it

We Did It

  • The CLEAN ANSWER IS finally here


Thank you

Thank You

  • Bob Janowicz (president)

    GIS Innovations Ltd

    310-1200 West 73rd Avenue

    Vancouver, BC, V6P 6G5

    [email protected]


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