Dear GIS-IDEAS 2026 Organizing Committee,

I am writing to kindly ask you to check and confirm the publication status and publication venue of my paper submitted to GIS-IDEAS 2026:

*“Evaluation of New Global Gravity Models Using GNSS-Leveling Data in Viet Nam”*

I have already paid the Conference Fee for GIS-IDEAS 2026, as shown in the attached payment confirmation. The payment was made on *28 May 2026*, with the following transaction details:

- *Amount:* VND 1,500,000 - *Payment content:* Phung Trung Thanh – Evaluation of New Global Gravity Models Using GNSS-Leveling Data in Viet Nam – paid for GIS-IDEAS2026

Before making the payment, I had also contacted the organizers by email to express my preference for having this paper considered for publication in *The GIS-IDEAS Journal (TGIJ)* under the journal APC arrangement, rather than only in the *GIS-IDEAS 2026 e-Proceedings*.

Therefore, could you please kindly check your records and confirm *which publication venue my paper has been assigned to*:

1. *GIS-IDEAS 2026 e-Proceedings* (APCs included in the Conference Fee), or 2. *The GIS-IDEAS Journal (TGIJ)* (journal APCs).

If my paper is currently scheduled for the e-Proceedings, I would also appreciate it if you could let me know whether my previous request to consider the paper for *TGIJ* has been received and whether it is still possible to process it for the journal.

I would be very grateful if you could confirm the current status of my paper so that I can make sure that the publication arrangement is correct.

Thank you very much for your assistance. I look forward to hearing from you.

Best regards, *Phung Trung Thanh*