Table 1.

Mean elevation of provinces and the whole Vietnamese Mekong delta

Province	Topo DEM	SRTM DEM	MERIT DEM
An Giang	1.42	3.3	3.8
Đồng Tháp	1.41	3.7	4.4
Long An	1.07	2.4	3.9
Bến Tre	0.95	2.6	3.1
Vĩnh Long	0.94	2.1	2.6
Tiền Giang	0.85	2.8	3.6
Trà Vinh	0.79	2.5	2.8
Cần Thơ	0.72	2.9	3.9
Sóc Trăng	0.68	2.0	3.5
Cà Mau	0.59	2.3	2.4
Bạc Liêu	0.50	2.0	2.9
Kiên Giang	0.39	2.5	3.1
Hậu Giang	0.38	1.9	3.4
Entire Mekong delta	0.82	2.6	3.3

Provinces are ranked from highest to lowest elevation according to the Topo Digital Elevation Model (DEM). The mean values are given for the Topo, SRTM and MERIT DEMs with one additional decimal than present in the input data to distinguish mean elevation differences. Bedrock outcrops, rivers and islands were excluded from this analysis. Province boundaries are shown in Fig. 1A. Additional elevation statistics are given in Supplementary Table 1