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v. FME Worldwide User Conference - Vancouver. Sep. 21-22, 2006. Validation of Spatial Networks using FME Mark Stoakes, Safe Software. Validation of Spatial Networks. National Research Canada Center for Topographic Information Responsible for: National Hydrological Network

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FME Worldwide User Conference - Vancouver

Sep. 21-22, 2006

Validation of Spatial Networks using FME

Mark Stoakes, Safe Software

validation of spatial networks
Validation of Spatial Networks
  • National Research CanadaCenter for Topographic Information
    • Responsible for:
      • National Hydrological Network
      • National Road Network
      • and others…
    • Maintains the -
      • Geospatial Database (GDB)
        • NHN, NRN, etc.
      • Geospatial Database Catalogue
        • Description of the GDB and the spatial relationships for the network (HTML & XML)
geospatial database catalogue
Geospatial Database Catalogue
  • Full definition of the network GDB
    • feature classes (class code)
    • sub-classes (sub-class code)
    • geometries (geometry code)
    • attributes
    • Spatial relationships between feature classes
    • Available in both HTML & XML documents
components of spatial constraint
Components of Spatial Constraint
  • Topological operator
    • Spatial relationship to be validated
      • DISJOINT, TOUCHES, TOUCHES – TANGENT, WITHIN, etc.
      • or an Eigenhoffer mask; a.relation (b, `***,**F,***')
  • Cardinality
    • The minimum and maximum number of intersections authorized between two geometries
  • GDB code
    • The GDB code of the class in relation to the element to be validated.
  • Relation with multiple features
fme validation process key steps
FME Validation ProcessKey Steps

Read BASE

features

(ArcSDEQuerier)

Tests:

Spatial predicate

Cardinality

AND/OR relation

ArcSDE Query

Test Spatial

Relationship

(SpatialRelator)

Error

Tables

Read XML

Rules

FAIL

Read

CANDIDATE

features

(ArcSDEQuerier)

PASS

validation issues
Validation Issues
  • Tolerance testing
    • tolerance tests alter the the spatial predicate

i.e. TOUCHES  INTERSECTS

  • DISJOINT predicate
    • SpatialRelator does not test for DISJOINT

Used INTERSECTS instead and the invert the results

  • Data Volume
    • Multiple queries for the CANDIDATE features
  • ArcSDE WHERE
    • Queries all the tables – very inefficient queries
  • FME list attributes
    • TCL used to enhance the existing list transformers:ListAppend, subListSearch&Replace, subListDuplicateRemover,subListPromoter, RangeTester
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