Dear Participants of GIS-IDEAS 2021, Greetings to all of you from the GIS-IDEAS 2021 Team! We are hoppy to announce the the electronic proceedings of the GIS-IDEAS 2021 is now available and can be accessed at the following link https://gisws.media.osaka-cu.ac.jp/gisideas20/Proc_GISIDEAS_2021_31_1_22.pdf The PDF file is password protected and the password is the name of the conference (all is small letters without hyphen) followed by the year (YYYY) that the conference was held. We thank you all for submitting your full paper to the proceedings. We apologize for the delay in bringing out the proceedings due to unavoidable circumstances. Take care and stay safe! -- Sincerely, Conference Secretariat Attn: Secretary GIS-IDEAS 2021 Email: gidea-office@gisws.media.osaka-cu.ac.jp