On behalf of the local organizing committee, we would like to welcome you to the 42nd Asian Conference on Remote Sensing (ACRS2021) which will take place at Can Tho University, Can Tho on November 22, 2021. The conference aims to promote and facilitate Remote Sensing and related geospatial technological advancement. In addition, this conference will provide good opportunities for innovative knowledge exchange and collaboration among the member countries. The theme for ACRS2021 is "Remote Sensing for Disaster Risk and Resources Degradation Reduction toward Sustainable Development". This is our first time to organize ACRS in Can Tho. The Local Organizing Committee(LOC) members are working so hard every day. So I have no doubt on the success of the conference.