REMOTE MEASUREMENT OF SOIL ENVIRONMENT
by
B.V. VINOGRADOV
Academy of Sciences
Profsoyuznya 101-244
Moscow 117279
USSR
Mathematical description of relations between soil features (humus
content, soil moisture and salinity) and optical indicators in ana-
lytical forms is realised for quantitative interpretation of aerial
and space images. The equation of relation between spectral reflec-
tance within 0.6-0.7 mm and humus content (h) is approximated with
exponent function:p(h)spo*(90,-p, )exp(-kh), where P,-reflectance of
parent subsoil without humus, p,-reflectance of high-humus soil.
The equation of relation between spectral reflectance at the same
spectral band and soil moisture (wo) is approximated with the sum
functions - SXpOAeEt of terminal order and power ones: p(w, )=0 +
+(P =p, ) exp(-ew, )+dw, , where P,-reflectance of dry soil, p,-reflec-
tance of wet soil. Using this technology we derive a full transfer
function from optical data on aerial and space images (D) throughout
gpectral reflectance of soil surface (p) to humus content and moistu-
re (hb ,w ) with gradations 1-2% and 2-4%, respectively.
(See:B.V.Vinogradov'Space Methods in Natural Resources Studies" ,Mos-
cow, Edition House"Mys1",1976,296p.; Remote Sensing Functions for
Interpretation of Humidity from Aerial and Space Images.-Trudy Gosu-
darstvennogo Gidrologitcheskogo Insitituta,Leningrad, y .285,1980,
pp.13-24; Remote Sensing of Humus Content in Soils.-Potchvovedenie,
Moscow, N 11,pp.114-123).
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