Dear Sir, I'm sorry to bother you. Refer to the article "FLOOD EXTENT DETECTION WITH DIFFERENCING WATER INDICES USING LANDSAT 8 DATA" by Iyarat ounrit1, Somsarit Sinnung2, Pattanapol Meena3, and Teerawong Laosuwan4. This article is grouped in the poster presentation section. >From an inquiry to the GIS-IDEAS secretariat, it was revealed that some articles have requested that manuscripts to be withdrawn from oral presentations. I therefore request that the organizers of the conference GIS-IDEAS change the status of this article from poster presentation to oral presentation. Thank you very much for your kind support. Best regards, Iyarat ounrit Department of Physics Faculty of Science Mahasarakham University Maha Sarakham, Thailand