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Sep. 21-22, 2006

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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Sep. 21-22, 2006

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  1. v FME Worldwide User Conference - Vancouver Sep. 21-22, 2006 Validation of Spatial Networks using FME Mark Stoakes, Safe Software

  2. 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)

  3. 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

  4. NRCan NHN GDB

  5. 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

  6. Spatial Relationships

  7. 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

  8. Validation Workspace

  9. 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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