Climate, Climate Variability and Impacts in the Mediterranean Area: An Overview
REFLECTANCE OF MEDITERRANEAN SOILS
0.8
UJ 0.6
()
Z
~ 04
()
UJ
...J
U.
UJ 0.2
a:::
o gso SOO 7S0 1000 12S0 1S00 17S0 2000 22S0 2S00
WAVELENGTH (nm)
ERQS26e -
GEOS26e
-
RM0S248 -
ST22&23
G, OS248 -
G205248
='& 26
Fig. 4a. Reflectance of three soil types. The violet and blue spectra represent
thinly vegetated soil with white calcic stone pebbles viewed with the sun in the
back (violet) and with the sun in front (blue). The measurements were taken
near Matera, Italy. The grey, yellow, and green lines are spectra of smooth
respectively grainy "grey" soil surfaces. The red and brown lines stem from
a smooth respectively grainy "red" soil surface. Further details see in the text
CHANGE OF SOIL REFLECTANCE AFTER IRRIGATION
1 S I water on 40 em x 40 em flat sOil at 10:09 MEST
0.5
0.4
UJ
()
~ 0.3
~
()
UJ 0.2
...J
u.
UJ
a::: 0.1
0·950 500 750 1000 12S0 1500 1750 2000 2250 2500
WAVELENGTH (nm)
_
dry 09 sa
-
wet + 8m!n
- ~ + 28 min
- wet. 351 mIn
Fig. 4b. Dependence of spectral reflectance on the soil moisture. The in this
case brounish soil (Tuscany, italy) was irrigated at 10:09 hours with
approximately 9 mm water. The liquid water absorption bands become a
prominent feature after the irrigation and disappear again as the soil dries
15