Publication Date: 2020-02-07

Approval Date: 2019-11-22

Submission Date: 2019-10-31

Reference number of this document: OGC 19-019

Reference URL for this document: http://www.opengis.net/doc/PER/t15-D017

Category: OGC Public Engineering Report

Editor: Martin Klopfer

Title: OGC Testbed-15: Portrayal Summary ER


OGC Public Engineering Report

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Copyright © 2020 Open Geospatial Consortium. To obtain additional rights of use, visit http://www.opengeospatial.org/

WARNING

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.

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1. Subject

This OGC Engineering Report provides an executive summary of the Open Portrayal Framework (OPF) Thread in OGC Testbed-15. The work in this testbed occurred between April and November 2019. Full details of the requirements, high-level architecture, and solutions are provided in the following Engineering Reports:

2. Executive Summary

The OGC Open Portrayal Framework (OPF) is a set of emerging models and Application Programming Interface (API) specifications that support interoperable portrayal of heterogeneous geospatial data. The OPF facilitates the rendering of geospatial data in a uniform way, according to specific user requirements. The primary topics addressed in the OPF thread covered supporting style sharing and updates, client- and server-side rendering of both vector- and raster data, and converting styles from one encoding to another. This work was based on the concepts, relationships and terms defined in a draft conceptual style model. In addition, the requirement to render data according to style definitions in a scenario with denied, disrupted, intermittent, and limited bandwidth (DDIL) infrastructure was addressed.

2.1. Document contributor contact points

All questions regarding this document should be directed to the editor or the contributors:

Contacts

Name Organization Role

Martin Klopfer

Frisia IT

Editor

Jeff Yutzler

Image Matters

Contributor

Joe Jagiella

Image Matters

Contributor

Clemens Portele

interactive instruments

Contributor

Keith Pomakis

CubeWerx Inc.

Contributor

Andrea Aime

GeoSolutions

Contributor

Stefano Bovio

GeoSolutions

Contributor

Jerome St-Louis

Ecere

Contributor

Joan Maso Pao

Universitat Autònoma de Barcelona (CREAF)

Contributor

Jeff Harrison

AGC

Contributor

Matt Sorenson

AGC

Contributor

Carl Reed

OGC

Contributor

Ingo Simonis

OGC

Contributor

2.2. Foreword

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The Open Geospatial Consortium shall not be held responsible for identifying any or all such patent rights.

Recipients of this document are requested to submit, with their comments, notification of any relevant patent claims or other intellectual property rights of which they may be aware that might be infringed by any implementation of the standard set forth in this document, and to provide supporting documentation.

3. References

There are no normative references to content in this document.

4. Terms and definitions

For the purposes of this report, the definitions specified in Clause 4 of the OWS Common Implementation Standard OGC 06-121r9 shall apply. In addition, the following terms and definitions apply.

Style

a sequence of rules of symbolizing instructions to be applied by a rendering engine on one or more features and/or coverages

Style encoding

specification to express a style as one or more files

Note
In Testbed-15 Mapbox Styles, OGC SLD versions 1.0 and 1.1 are used.
Icons

In computing, an icon is a pictogram or ideogram displayed on a computer screen in order to help the user navigate a computer system. https://en.wikipedia.org/wiki/Icon_(computing)

Layer

basic unit of geographic information that may be requested as a map from a server.

Portrayal

The ISO defines portrayal as presentation of information for human. See ISO 19117:2012, Geographic information - Portrayal. https://www.iso.org/standard/46226.html

Sprites

A sprite is a computer graphics term for a two-dimensional bitmap that is integrated into a larger scene.

Stylesheet

representation of a style in a style encoding

Style metadata

essential information about a style needed to support users to discover and select styles for rendering their data and for visual style editors to create user interfaces for editing a style

Coverages API

The draft OGC API - Coverages specification provides an API building block for accessing coverages as defined by the Coverage Implementation Schema (CIS) 1.1 on the Web.

Features API

The OGC API - Features - Part 1: Core standard provides API building blocks to create, modify and query features on the Web.

Maps API

The draft OGC API - Maps specification provides an API building blocks to describe, build and retrieve web maps.

Rendering engine

A rendering engine is an automated process that produces graphics using a pipeline of layers and styles as inputs. A rendering engine is commonly found in desktop or server-based geographic information systems.

Styles API

The draft OGC API - Styles specification is a Web API that enables map servers and clients as well as visual style editors to manage and fetch styles.

Tiles API

The draft OGC API - Tiles specification provides an API building block to describe, build and retrieve tiles from any resource that can be subdivided in a regular set of tiles (e.g., maps, features and coverages)

Web API

API using an architectural style that is founded on the technologies of the Web

4.1. Abbreviated terms

API

Application Programming Interface

OGC

Open Geospatial Consortium

SLD

OGC Styled Layer Descriptor

SE

OGC Symbology Encoding

5. Open Portrayal Framework: High-Level Overview

This chapter provides an overview of the main requirements and achievements of the OGC Testbed-15 Open Portrayal Framework (OPF) Thread.

In the first section of this chapter the OPF scenario is briefly described based on the four major scenario aspects:

  • Applying styles to data;

  • Modifying and managing styles;

  • Managing “changesets”;

  • Addressing offline or DDIL situations.

The second section of this chapter describes how the work completed in the OPF thread set a milestone towards realizing a fully interoperable multi-source/multi-data type geospatial data rendering environment.

The third and final section of this chapter highlights the achievements of the testbed participants, demonstrating how the OPF scenario requirements were addressed.

5.1. OPF Scenario

Figure 1 illustrates the overall Testbed 15 OPF scenario. The scenario consists of four main parts. These four parts are further illustrated with screen captures from live online and video demonstrations below.

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Figure 1. Open Portrayal Framework usage scenario

In OGC Testbed 15, participants assessed the ability of the OPF to support simulated users in a humanitarian relief situation. To accomplish this task, governmental and nongovernmental partners must understand the environment and infrastructure in the Daraa, Syria area - and quickly share that understanding with a variety of partners.

To promote this 'common picture', simple maps with styles for day or night operations must be rapidly customized and shared between partnering organizations from many nations. The most recent satellite imagery for the Daraa, Syria, area must also be added to the 'common picture', as illustrated below: