262
Multiscale Hydrologic Remote Sensing: Perspectives and Applications
11.4.4  evaluation of event 3
For the November 2008 event, the ASTER image with higher spatial resolution is
shown in Figure 11.5c. The POD of CREST shows an increase from 0.46 at a radius
of 30-m to 0.88 at a radius of 600 m. Figure 11.5c also illustrates that, within a 30-m
radius, FAR could be as high as 0.75. With the increase in radius to 600 m, however,
33°50'E 34°0'E 34°10'E 34°20'E
0°30'N
0°20'N
0°10'N
0°10'S
0°20'S
0°0'
MODIS flood detection
Nzoia River
Nzoia River Basin
Country boundary
Lake Victoria
High: 4122
Low: 952
Elevation (m)
Lake Victoria
Aug 22, 2007
(DOY 234)
Aug 22, 2007
(DOY 234)
Kenya
Kenya
Uganda
Uganda
Lake Victoria
(c1)
(c2)
N
33°50'E 34°0'E 34°10'E 34°20'E
0°30'N
0°20'N
0°10'N
0°10'S
0°20'S
0°0'
MODIS flood detection
Nzoia River
Nzoia River Basin
Lake Victoria
Country boundary
High: 4122
Low: 952
Elevation (m)
Lake Victoria
Aug 24, 2007
(DOY 236)
Aug 24, 2007
(DOY 236)
Kenya
Kenya
Uganda
Uganda
Lake Victoria
(d1)
(d2)
N
FIGURE 11.3  (Continued)