water90 + water92 = water
vegetation90 + vegetation92 = vegetation
water90 + vegetation92 =vegetation
vegetation90 + water92 =vegetation
Preliminary conclusions. Such a plan contains the
floating reed islet position during the two recording
years. Measuring the distance between two positions on
that plan, we could establish its average shifting speed
(about 3 m per day). As its shifting direction is not a
linear one owing to the predominant wind directions and
lake bed configuration, this rough value could be seen as
minimum.
(B) For the statistical study of the natural patrimony
changes from the last 1981 updating, a new so-called
NOUPLAN plan has been compiled using the linkage
between the plan from which the dynamic phenomena
were removed (L90SAU92) and the 1981 digitised plan
(PLAN81). This time, no commutative rules were used to
point out changes but only supplementary attributes.
Rule3: L900R92 * PLAN81 =NOUPLAN
LAC * LAC LAC,
VEGET + VEGET = VEGET,
LAC + VEGET = LAC,
VEGET + LAC = VEGET,,
Preliminary conclusions. m index shows a change, but
n index shows an unchangeable result. Adding surfaces
with the same index, the change situations are quickly
established. The analysis points out the water surface
variation during the two reference years (1990 and 1992)
- is about 100 ha against 2,200 has water we have
investigated (i.e. a 5 per cent variation). The variation
based on the oldest investigate plan PLANSI, is 450 has
as against 2,200 has (i.e. a 20 per cent variation). These
variations are caused by the permanent setting up and
destruction of the floating reed islets owing to the wind
and water action.
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996