Monitoring Agricultural Drought in Poland - Monitoring and Predicting Agricultural Drought: A Global Study - page 174

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Line
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0.8
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Norm
PgEn

Fig ure 13.3 Map of drought-prone areas in Poland.

in each dekad after June 1 was higher than 25° C ( > 2); (6) if soil moisture
was extremely low; and (7) if shortage of water was reported by farmers
for at least 25% of farm wells.
Every indicator described above is assigned 1 point if the threshold
condition is met and 0 point if the condition is not met. The total sum
of the assigned points is denoted as the drought index (DI), which is used
to assess drought conditions. A drought is classified as no drought if DI

[174

=

0; drought if DI = 1 or 2; heavy drought if DI = 3, 4, or 5; and very heavy

drought if DI 6or7.

The Institute of Meteorology and Water Management ( www.imgw.pl)
de veloped the above criterion of drought assessment based on point mea-
su rement (Slota et al., 1992). Figure 13.4 shows classification of drought
du ring 1992 using the above criterion. But this criterion could not be used
be cause it was too time consuming and labor intensive. Therefore, another
ap proach based on satellite data was developed during the 1990s at the Re-
m ote Sensing Center of the Institute of Geodesy and Cartography, Warsaw
( www.igik.edu.pl) for monitoring crop conditions and drought.

=

R emote Sensing-Based Crop Condition Assessment System

Using the National Atmospheric Oceanic Administration (NOAA) satel-
lite's Advanced Very High Resolution Radiometer (AVHRR) data, three