CDB Vector Data in GeoPackage Interoperability Experiment

Overview

The CDB Vector Data in GeoPackage Interoperability Experiment  has tested encodings of vector data via GeoPackage in the OGC CDB 1.1 Standard and Best Practices. A primary objective of this IE was to inform decision making for possible enhancements in the OGC CDB Standards Working Group (SWG). 

The proposed IE outcomes resulted in recommendations for changes to, alternatives to, or replacement of, the OGC CDB 1.1 Volume 1:  Core Standard (15-113r5) and OGC CDB 1.1 Volume 4: OGC CDB Best Practice use of Shapefiles for Vector Data Storage (16-070r3).  The proposed IE outcomes further resulted in recommendations for future work in the next major revision to the OGC CDB Standard and Best Practices (CDB 2.0).

Experiments

Participants in this IE analyzed and/or perform one or more of the following experiments, and contribute to the IE Engineering Report.  Two ‘sample’ CDB datasets were in the process of being approved for release as resources to participants in this IE.

Experiment #1

The methodology involves:

• Acquisition of sample dataset(s) provided for the IE.
• Use of provided open-source software to modify each sample dataset according to the three technical alternatives.  
• Consensus and provision of baseline (unmodified) and three alternative encoding datasets.
• Evaluate process and provide feedback on conversions resulting from Experiment #1.

Experiment #2

The methodology involves:

• Modifying implementation software according to Alternative #1.
  • Replace each Shapefile, consolidating the three geometry files with a single GeoPackage.
• Evaluate and compare performance using the baseline CDB datasets and the Alternative #1 datasets.
• Evaluate analysis and results from Experiment #2  for performance, backwards-compatibility and risks to interoperability.

Experiment #3

The methodology involves: 

• Modifying implementation software according to Alternative #2.
  • Store each CDB LOD as a layer in GeoPackage
• Evaluate and compare performance using the baseline CDB datasets and the Alternative #2 datasets.
• Evaluate analysis and results from Experiment #3 for performance, backwards-compatibility and risks to interoperability.

Experiment #4

The methodology involves:

• Modifying implementation software according to Alternative #3.
  • Store each Geocell of Vector Data as a layer in GeoPackage (extends Alternative #3 to have a single GeoPackage per Geocell of CDB, with all LODs and all CDB feature layers).
• Evaluate and compare performance using the baseline CDB datasets and the Alternative #3 datasets.
• Evaluate analysis and results from Experiment #4 for performance, backwards-compatibility and risks to interoperability.

Draft Schedule

If you are interested in commenting on or participating in this IE, please contact te******@************al.org before January 21, 2019.