• Research of the Severity of Litter at Proposed Tokyo Olympics Venues

    Project Host: The Another Project (accredited NPO corporation)

    Supporters/Sponsors: Mobile Communication Fund (NPO corporation), Gumclean Company Ltd.

    Technological Assistance: Pirika, Inc.


    Images@2016,Cnes/Spot Image, Digital Earth Technology, DigitalGlobe, Landsat, The GeoInformation Group, Google

  • Results

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    Comparison of amount of litter per 1 m of sidewalk

    Comparison of amount of stuck gum per 1 m of sidewalk

    Comparison of litter severity

  • Research Method

    With financial support and sponsorship from 2 organizations and help from more than 40 people, we conducted this research.

    1. Selection of Research Areas

    Of the proposed venues for the Tokyo Olympics (34 venues as of May 2016), we selected 16 areas for research based on the following factors, after grouping the venues based on proximity to each other:
    ・Ability to enter
    ・Number of neighboring venues
    ・Possibility of venue relocation
    ・Distance from closest station
    Selected Venues: National Olymic Stadium, Yoyogi Park, Kudanshita, Ryogoku, Tokyo City Keiba, Daiba, Ariake, Shin-Kiba, Kasai Rinkai Park, Tobitakyu, Shin-Yokohama, Enoshima, Urawa-Misono, Saitama-Shintoshin, Kaihin Makuhari

    2. Selection of Research Routes

    We selected sidewalks to be researched at each research area based on the following factors:
    ・Route from closest station to venue
    ・Perimeter around venue
    ・Routes and surroundings of perimeter

    3. Video Recording

    We recorded on video sidewalks using a smartphone research app. The total distance covered was 75 km.


    *We conducted the research using "Takanome", a proprietary anti-litter research program developed by Pirika, Inc. With Takanome, we can record streets using a smartphone and identify the type and measure the amount of litter captured on video.

    4. Video and Image Analysis

    We analyzed the types and amounts of litter captured on video (from step #3) .

    5. Quality Control

    Trained staff conducted the final review. (For example, because it is difficult for our current program to distinguish properly discarded trash from litter, we implemented a quality control measure by reviewing the results with the human eye.)


    More than 40 people spent more than 1,000 hours to review more than 100,000 pieces of litter.

    6. Analysis and Data Visualization

    We collected and analyzed the data, and created heat maps and graphs. Litter trends and distribution at each Olympics venue became clear, and we have made progress in providing effective solutions for the litter problem.


    We plan to share the results with local governments and officials and private enterprises that may be impacted by the results, in the hope that they will lead to development and implementation of effective anti-litter measures.

  • Data Disclosure

    Our aim is to contribute to litter research and solutions by disclosing for free the data acquired through and report prepared for this project. Please contact us if you wish to obtain any of of the following data or report.

    Litter data (approx. 100K items)

    Number of pieces
    Types (approx. 30)


    Location (latitude & longitude)

    Research time

    Images and videos of research areas

    Images (approx. 120K)

    Distance per recorded route (total of 75.6km)

    Location (latitude & longitude)

    Research time

    Research report

    Other data

  • Supporters and Sponsors

    We implemented this project with the financial support and sponsorship from the following organizations.

  • Contact

    Inquiries related to the project:

    THE ANOTHER PROJECT (NPO corporation)



    Inquires related to research methodology and data:

    Pirika, Inc.