2019 FOSS4G Bucharest Talks speaker: Yoichi Kayama

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Design and development of the UN Vector Tile Toolkit

The UN Open GIS Initiative is catalyzing the development of an open community for basemap vector tile providers. The Initiative promotes the UN Vector Tile Toolkit, a package of open source tools designed to enable public basemap providers, such as the United Nations geospatial information services or governmental mapping organizations, among others, to deliver their basemap vector tiles leveraging the latest web map technologies. The toolkit provides a set of Node.js open source scripts designed for developers to use in conjunction with existing and proven open-source vector tile software (such as Tippecanoe, Maputnik, Mapbox GL JS and vt-optimizer). The toolkit will help organizations to produce, host, style, and optimize fast and interoperable basemap vector tiles, making them available with various application frameworks.

This paper presents the methodology followed to support the requirements from the UN Peacekeeping operations’ point of view. The significant challenges were to ensure (1) flexibility of the software so that it works with different source data, including UN mission-specific basemap data and global OpenStreetMap data, (2) automatic and continuous update of global basemap vector tiles, (3) fast vector tiles that can be used with mobile devices in the field, and (4) interoperability with existing enterprise geospatial software frameworks.

We approached these challenges by introducing "on-the-fly vector tile schema modification" to the Toolkit so that an agile adaptation, improvement, and optimization of the vector tile schema is possible. This method also reduces the use of temporary storage and improves the processing time by exploiting the outstanding stream processing capabilities of Node.js and Tippecanoe. We also adopted an approach to produce basemap vector tiles in modules, so that the processes to produce and deploy the vector tiles are well pipelined. This modularization approach also extended the scalability of the Toolkit by allowing parallel or even distributed production. Quantitative measurements, like in vt-optimizer, were other dominant methodology adopted in the Toolkit that enabled evidence-based performance tuning and production time reduction the vector tiles. As a result, we successfully implemented automatic and continuous updates of basemap vector tiles from a continuously updated PostGIS database. The paper also covers how the project ensured interoperability with different existing enterprise geospatial software frameworks that use less-advanced web map libraries.

The project aims to build a sustainable community of developers supporting the provision of fast and interoperable basemap vector tiles that meet the requirements of various users in the field missions and UN headquarters among others.

Development of a public toilet search system using open data and chatbots

Tokyo Metropolis publishes a lot of data, and holds an application contest using that data every year.
The 2017 contest had the challenge of "developing a tool that would allow everyone to find the perfect toilet for them on the go".
I applied for the contest on this subject.
There is a chat tool named LINE in Asia,many people use it.
We can respond to user input programmatically by creating an auto-answer program called Bot and linking it to this chat tool.
I thought that I could search for toilets from LINE if I made a search bot.
Some Japanese public toilets are barrier-free.Some toilets have a table to replace baby diapers.
Some toilets have facilities for people who wear stoma to clean it.
The toilet data published by the Tokyo Metropolitan Government contains information on the position of the toilet and the equipment attached to the toilet.
The chat tool LINE is often used using a smartphone. If you use a smartphone, you can search public toilet in Tokyo.

So I made a prototype to search the toilet using location and facility information as LINE input program.
I used FOSS4G to handle location information in creating this program.
At this conference, I would like to explain this development.