Publication Date: 2020-07-08
Approval Date: 2020-06-26
Submission Date: 2020-05-05
Reference number of this document: OGC 19-084
Reference URL for this document: http://www.opengis.net/doc/PER/vtp2-D002
Category: OGC Public Engineering Report
Editor: Andrea Aime
Title: OGC Vector Tiles Pilot 2: Vector Tiles Filtering Language Engineering Report
Copyright © 2020 Open Geospatial Consortium. To obtain additional rights of use, visit http://www.opengeospatial.org/
This document is not an OGC Standard. This document is an OGC Public Engineering Report created as a deliverable in an OGC Interoperability Initiative and is not an official position of the OGC membership. It is distributed for review and comment. It is subject to change without notice and may not be referred to as an OGC Standard. Further, any OGC Public Engineering Report should not be referenced as required or mandatory technology in procurements. However, the discussions in this document could very well lead to the definition of an OGC Standard.
Permission is hereby granted by the Open Geospatial Consortium, ("Licensor"), free of charge and subject to the terms set forth below, to any person obtaining a copy of this Intellectual Property and any associated documentation, to deal in the Intellectual Property without restriction (except as set forth below), including without limitation the rights to implement, use, copy, modify, merge, publish, distribute, and/or sublicense copies of the Intellectual Property, and to permit persons to whom the Intellectual Property is furnished to do so, provided that all copyright notices on the intellectual property are retained intact and that each person to whom the Intellectual Property is furnished agrees to the terms of this Agreement.
If you modify the Intellectual Property, all copies of the modified Intellectual Property must include, in addition to the above copyright notice, a notice that the Intellectual Property includes modifications that have not been approved or adopted by LICENSOR.
THIS LICENSE IS A COPYRIGHT LICENSE ONLY, AND DOES NOT CONVEY ANY RIGHTS UNDER ANY PATENTS THAT MAY BE IN FORCE ANYWHERE IN THE WORLD. THE INTELLECTUAL PROPERTY IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE DO NOT WARRANT THAT THE FUNCTIONS CONTAINED IN THE INTELLECTUAL PROPERTY WILL MEET YOUR REQUIREMENTS OR THAT THE OPERATION OF THE INTELLECTUAL PROPERTY WILL BE UNINTERRUPTED OR ERROR FREE. ANY USE OF THE INTELLECTUAL PROPERTY SHALL BE MADE ENTIRELY AT THE USER’S OWN RISK. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR ANY CONTRIBUTOR OF INTELLECTUAL PROPERTY RIGHTS TO THE INTELLECTUAL PROPERTY BE LIABLE FOR ANY CLAIM, OR ANY DIRECT, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM ANY ALLEGED INFRINGEMENT OR ANY LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR UNDER ANY OTHER LEGAL THEORY, ARISING OUT OF OR IN CONNECTION WITH THE IMPLEMENTATION, USE, COMMERCIALIZATION OR PERFORMANCE OF THIS INTELLECTUAL PROPERTY.
This license is effective until terminated. You may terminate it at any time by destroying the Intellectual Property together with all copies in any form. The license will also terminate if you fail to comply with any term or condition of this Agreement. Except as provided in the following sentence, no such termination of this license shall require the termination of any third party end-user sublicense to the Intellectual Property which is in force as of the date of notice of such termination. In addition, should the Intellectual Property, or the operation of the Intellectual Property, infringe, or in LICENSOR’s sole opinion be likely to infringe, any patent, copyright, trademark or other right of a third party, you agree that LICENSOR, in its sole discretion, may terminate this license without any compensation or liability to you, your licensees or any other party. You agree upon termination of any kind to destroy or cause to be destroyed the Intellectual Property together with all copies in any form, whether held by you or by any third party.
Except as contained in this notice, the name of LICENSOR or of any other holder of a copyright in all or part of the Intellectual Property shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Intellectual Property without prior written authorization of LICENSOR or such copyright holder. LICENSOR is and shall at all times be the sole entity that may authorize you or any third party to use certification marks, trademarks or other special designations to indicate compliance with any LICENSOR standards or specifications.
This Agreement is governed by the laws of the Commonwealth of Massachusetts. The application to this Agreement of the United Nations Convention on Contracts for the International Sale of Goods is hereby expressly excluded. In the event any provision of this Agreement shall be deemed unenforceable, void or invalid, such provision shall be modified so as to make it valid and enforceable, and as so modified the entire Agreement shall remain in full force and effect. No decision, action or inaction by LICENSOR shall be construed to be a waiver of any rights or remedies available to it.
None of the Intellectual Property or underlying information or technology may be downloaded or otherwise exported or reexported in violation of U.S. export laws and regulations. In addition, you are responsible for complying with any local laws in your jurisdiction which may impact your right to import, export or use the Intellectual Property, and you represent that you have complied with any regulations or registration procedures required by applicable law to make this license enforceable.
- 1. Subject
- 2. Executive Summary
- 3. References
- 4. Terms and definitions
- 5. Overview
- 6. Introduction
- 7. Previous work
- 8. Filter Conceptual Model and VTP2 testing considerations
- 9. Filtering Tiles
- 10. Filtering GeoPackages with Vector Tiles
- 11. Implementations
- 11.1. GeoSolutions D100 OGC API - Features
- 11.2. Terranodo D100 OGC API - Tiles
- 11.3. interactive instruments D101 Features, Tiles and Styles API
- 11.4. GeoSolutions D102 OGC API - Tiles
- 11.5. Ecere D103 Features & OGC API - Tiles
- 11.5.1. Examples of filtering expressions used with the OGC API - Features
- 11.5.2. Use of filtering for vector tiles
- 11.5.3. Multi-layer and scale-based filtering (OGC API - Tiles)
- 11.5.4. POST requests to the OGC API - Tiles
- 11.5.5. Filtering driven by styles
- 11.5.6. Retrieving attributes separately from geometry
- 11.5.7. CMSS Expressions Syntax
- 11.6. Ecere D105 Client
- 11.7. Ecere D107 GeoPackage producer & client
- 11.8. Skymantics D104 Client
- 11.9. GeoSolutions D104 Client
- 12. Results and findings
- 12.1. Issues Encountered
- 12.2. Findings
- 12.3. Recommendations
- 12.4. Future work
- Appendix A: CQL BNF
- Appendix B: Queryables
- Appendix C: Filter capabilities
- Appendix D: Revision History
- Appendix E: Bibliography
The OGC Vector Tiles Pilot 2: Vector Tiles Filtering Language Engineering Report (ER) defines a filter language for vector data delivered as tiles (also known as vector tiles). The language applies to vector tiles served through implementations of the OGC API – Features standard and the draft OGC API - Tiles specification, but can be generally applied on all services supporting filtering by attributes.
The ER further includes an assessment of filter languages, styles and online/offline symbol sharing for GeoPackages, OGC API - Features and OGC API - Tiles implementations for accuracy and completeness in applications that render vector tiles at local to regional scales.
The main benefits for transitioning from raster tiles to vector tiles has been the possibility of flexible map styling and the reduction of storage space required for maps, the latter allowing for maps being stored on devices with lower storage capacity as well as requiring lower bandwidth communications for transmission. In some cases, maps represented with vector tiles can be 20 to 30 times smaller than the same maps represented by raster tiles. This reduction enables the possibility of storing large sets of maps (i.e.,tile sets) into secure and lightweight removable media devices.
As described in Figure 1, a tile set repository (such as GeoPackage, Static Cache, or Compact Cache V2) is being used by a humanitarian relief convoy in the middle of the desert and with limited to no connectivity, supported by a group of interconnected systems working and communicating with each other. The repositories are generated at Command Post Computing Environments (CPCE) and comprise tile sets, styles, maps and routes served by National-level Services and Enterprise-level Services, which communicate with each other throughout OGC API Styles, API Tiles, API Images and API Routes.