International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
Table 2. Compare to Results of Non-Point pollution load estimation by Kyungancheon (unit : ton)
Load Unit Method Basin Flow Model by GIS Based
Estimate of Using Land Band Cover M:
Water Quality AnnAGNPS STORM Pollution Load | Cover Map & and«-ov en ap
Items Model Model In Ministry of (Ministry of Land Cover Map
; VM Environment (The others)
Kyungancheon | Environment's 80 - ^90)
Basin Load Unit
BOD 946 876 1,784 2,152 985-1,724 1,290
T-N 5,983 1,639 1,624 878 879-1092 1,168
T-P 11 1,237 138 80 164-241 265
2) Result and Investigation
The result of comparing AnnAGNPS model result and
STORM model result wiih in this study's result are shown in
Table 2.
He
+
bmx MA
2 2482 1B Be
A
a
2
Au qu ZA 0 2 JA oi 4» z2 oj [8 X
ni dd M ZEMNMN Soon E
2
2
CONCRETO 5^
2 ja 16 OX À 12 A 12
DEP AA WIA
3 cédès
10 0 10 20 Kilometers
19 0 10 28 Kilometers
Fig. 4. Reclassified 5 Categories with Level2 Land
Cover Map
If analyze land cover map and result that inflect
Ministry of Environment's load unit, T-N, T-P displayed a
little small but consistent result than other method. The reason
that T-N, T-P was a little shown caused by applying load unit
after land cover classification items revising into 5
categories(Fig. 3, 4).
GIS base basin of attraction outward flow model used soil
map, rainfall data to reference data as that use Ministry of
Environment land cover map in '80-'90's and any other
engine's land cover map. Load unit is expected that difference
can happen a little with actuality of our country because it is
American data (LTHIA/NPS).
Method by GIS base basin of attraction outward flow model
is considered that accuracy of land cover data is high becausc
fairly consistent result is deduced when compared result that
use Ministry of Environment land cover map and result that use
the other official land cover map.
4. Conclusions
Land use and Land cover are defining as other concept in the
United States of America and Europe, and then practical use of
land cover map is emphasized in environment.
Also, Comparing the load unit method and the GIS base
basin of attraction outward flow model using land cover map
with non-point source of pollution model that verified
already. As a result could know thing which of land cover map
is high in case of estimating non-point pollution load, because
fairly consistent result was deduced.,
Exclude subjectivity in non-point pollution load estimation
and to get consistent result, data requirement is minimum and
method that can exclude manual processing is suitable.
In these side land cover map as a quantitative and a digitizing
basic data is very useable for non-point source of polluuon
estimation.
Acknowledgement
We thank workers who try in map with heavy efforts. And we
acknowledge the critical counsel from advisers. Prof. Oh,
Kyung-Doo of KMA helped us with water quality modeling.
356
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