Table 1. Summaries of NDWI values in water points in six images.

Date	Min	Q1	Mean	Q3	Max	Std	Threshold
20 December 2003	0.24	0.30	0.32	0.35	0.41	0.04	0.26
10 February 2004	0.24	0.28	0.31	0.33	0.41	0.04	0.24
2 April 2004	−0.02	0.05	0.07	0.10	0.13	0.04	0.00*
19 June 2004	0.05	0.17	0.19	0.22	0.29	0.05	0.11
10 August 2004	0.13	0.16	0.18	0.19	0.25	0.03	0.13
27 October 2004	0.21	0.23	0.26	0.28	0.31	0.03	0.21

^*the exact value is 0.0044; Q1 and Q3 represent the first and third quartiles, respectively.