Dear GIS IDEAS 2026 Conference Secretariat,

I hope you are doing well. My name is Tran Thanh Thuong (Thuong Tran) from Thai Nguyen University.

Our team will present two papers at the conference next Saturday:

1. *Analytic Hierarchy Process–Based Landslide Susceptibility Assessment in Dai Tu, Thai Nguyen, Vietnam* 2. *Ensemble Tree-Based Machine Learning for Landslide Susceptibility Assessment in Cau River Watershed, Northern Vietnam*

On behalf of our team, I would kindly like to request official invitation letters for the following three authors, who have registered and paid the conference fee:

1. Dr. Tran Thanh Thuong – International School, Thai Nguyen University, Vietnam 2. Pham Quang Khai – International School, Thai Nguyen University, Vietnam 3. Dr. La Thi Cam Van – Institute for Excellence in Education and Research, Thai Nguyen University, Vietnam

Additionally, although *Dr. La Thi Cam Van has already registered and paid the conference fee, her name does not appear on the **Attendance Confirmation List* https://docs.google.com/spreadsheets/d/1HjsHRsQgiIwhm8LuEHMUDct95Bn7xeny/edit?gid=2053714835#gid=2053714835 ( https://docs.google.com/spreadsheets/d/1HjsHRsQgiIwhm8LuEHMUDct95Bn7xeny/edi...). Could you please check and update the list accordingly?

The invitation letters are essential for completing the administrative procedures at our university. As the conference is taking place next week, we would greatly appreciate it if you could issue the letters at your earliest convenience.

Thank you very much for your support. We look forward to hearing from you.

Best regards,