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Re: [sdw] Discussion thread for "Spatial Data on the Web 2022 – where next to drive impact from geospatial data" (#1271)

From: Rob Smith via GitHub <sysbot+gh@w3.org>
Date: Wed, 18 Aug 2021 10:32:17 +0000
To: public-sdwig@w3.org
Message-ID: <issue_comment.created-901004319-1629282735-sysbot+gh@w3.org>
I have a few comments on the [scoping statement](https://github.com/w3c/sdw/blob/gh-pages/roadmap/sdw2022.md) which I thought may be relevant.

 1. Conclusions from the [WebVMT breakout at TPAC 2020](https://github.com/w3c/sdw/issues/1194#issuecomment-718702993) identified distance and speed as desirable geospatial functions which can be derived from a trajectory. This chimes with current suggestions and also includes temporal aspects for moving objects.

 1. MQTT is being used in [Testbed-17 Moving Features](https://portal.ogc.org/files/?artifact_id=95726#MovingFeatures) to link the various components together - ingestion, storage, tracking and analytics. Track fragments are identified  from video by the ingestion service, linked together by the tracking service and analysed as moving objects by humans and machines with the goal of drafting an OGC API for Moving Features based on this software architecture.

 1. The scope of [WebVMT](https://w3c.github.io/sdw/proposals/geotagging/webvmt) has expanded from just location to generic video metadata which may qualify as a web building block for metadata tracks (as a counterpart to WebVTT for text tracks) to render content dynamically in user agents including use of map overlays.

 1. The WebVMT [Police Evidence use case](https://w3c.github.io/sdw/proposals/geotagging/webvmt/#policeevidence) provides an interesting mix of citizen-friendly requirements for open access to enable public contribution, privacy, ownership, security and evidence integrity to ensure that submitted data are genuine.

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