Dear GIS-Idea 2026 Conference Secretariat, Thank you very much for accepting our paper entitled “Assessment of Rice Growth at Different Phenological Stages Based on UAV Multispectral and High-Resolution UAV RGB Imagery.” which is scheduled for Session 8, from 11:20 to 11:40 on September 26, 2026. I regret to inform you that, due to a previously scheduled fieldwork assignment for my research project, I will not be able to attend GIS-Idea 2026 and present our paper as scheduled. I sincerely apologize for any inconvenience and greatly appreciate your kind understanding. I would like to express my sincere thanks to the Organizing Committee for the opportunity to participate in GIS-Idea 2026. I wish the conference great success and hope to have the opportunity to contribute to future GIS-Idea events. Thank you again for your understanding. Best regards, Le Van Canh