IOUG Spatial Summit 2016 - Oracle... Speaker : Date : E-mail : IOUG Spatial Summit 2016 Assembling a...

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Speaker : Date : E-mail :

IOUG Spatial Summit 2016 Assembling a large scale map for the Netherlands

Richard Huesken January 28th, 2016 [email protected]

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Introduction

■ Transfer Solutions ■ Oracle Gold Partner ■ Largest independent Oracle partner in the

Netherlands ■ Focus on Oracle and Java technology

■ Consulting ■ Managed services ■ Education

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Assembling a large scale map

■ Large scale map data ■ Scale 1:500 – 1:5000

■ Business case ■ Requirements ■ Solution ■ Results ■ Recommendations

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Business Case – Current problems

■ Collected by different organizations ■ Separate datasets ■ Different storage formats ■ Different object types ■ Different definitions ■ Data has been collected at different points in time ■ Data is collected with different quality standards

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Business Case – Separate datasets

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Business Case – Separate datasets

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Business Case – BGT

■ Country wide ■ Area : 41,453 km2 (currently: 5,213 km2) ■ Land : 33,893 km2 ■ Water : 7,650 km2

■ BGT estimates ■ 100,000,000 objects

■ Source data providers ■ 450 organizations

■ Implementation ■ Required by Law

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BGT – Automated Data Assembly

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Requirements - BGT Specification

■ GML 3.1.1 ■ Simple features profile ■ Extended with circular arcs (GM_ARC)

■ Ordinates rounded to 3 decimals (“mm grid”) ■ Topology

■ Adjacent objects share coordinates

■ Technical tolerance ■ Minimum distance from point to a line.

Set to 0.0005 m ( 1/2 mm)


Automated Assembly - Solution

■ Phase 1: Geometric approach ■ Eliminate gaps and overlaps ■ Stroke arcs selectively

■ Phase 2: Topological finish ■ Locate missing vertices (nodes) ■ Add missing nodes ■ Replace arcs

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Spatial Vector Acceleration (SVA)

■ New feature in 12c ■ New code path for spatial operations ■ Performance improvements

■ SVA optimizes sdo_geometry ■ Consecutive segments may be combined ■ Order of segments is not maintained ■ Collinear points are removed

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Arcs – final result

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Automated Assembly - Solution

■ Phase 1: Geometric approach ■ Eliminate gaps and overlaps ■ Stroke selected arcs

■ Phase 2: Topological finish ■ Locate missing vertices (nodes) ■ Add missing vertices ■ Replace arcs

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Missing nodes - detail

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Missing nodes – add node (vertex)

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Replace Arc – detail

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Replace Arc – result

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Results

■ A topologically correct dataset ■ Arcs are preserved wherever possible ■ 99.99% Automatic resolution in the first run ■ Datasets with exceptions are rejected.

■ A few objects are adjusted manually ■ The data is processed successfully in a second run.

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Recommendations

■ Technical ■ Use Oracle Spatial & Graph 12c ■ Use Spatial Vector Acceleration (SVA), with caution ■ Use Partitioning

■ Functional ■ Circular arcs are complicated ■ Use the simple features profile without arcs

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Questions Answers


CONSULTING | MANAGED SERVICES E

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CONSULTING | MANAGED SERVICES | EDUCATION


IOUG Spatial Summit 2016 - Oracle... Speaker : Date : E-mail : IOUG Spatial Summit 2016 Assembling a...

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