ion System
c Monit
A
LID
,
Commission III
Abstract:
A snow
is present
It
module
module,
of the
A query
1 ..
c
ion
The snow reserves
Continuous
an operati
resources,
techniques
areas .. This
of the snow cover.
is
water resources ..
snow cover on
tter management of
water
Satell
remote sens
information over large
cs
The
1
could be used for analysis
1
erm
operational
snowmapp
areas.
techniques include
ssing
images,
snow
interpretation,
s
s
evaluation
output of snow
map results .. Because the data from sat
s are very huge
and have to
proces
everyday,
these data
must
be
compressed and stored efficiently.. Then
is
necessary
that a image database system be used for efficient storing
and integrated management of the snow
It can highly
enhance queries of the snow data access.
In order to make monitoring
the snow covers more
effect
t , it is reasonable to establi
a snow
dynamic
information
system(
S) .
SDMIS
system is a
tion
system
database system..
sent into
snow maps
on,
in the
se..
snow
on
can be acqui red
query
ss
the
In the following sections,
SDMIS system will be
2..
Structure of
SDMIS System
The SDMIS
tern is a man-machine interactive system .
It consists of
modules:
ssing module, database
module and output module.
III
(1 )
tion Sources
come
etc.
tion
the
(2)
e
ions.
s s
e
a ..
from
The
rate
snow
tion
Geometric
ginal
s
be
s
correction,
1
tc
c
c
d
1
of contour
(3 )
se Module
The
se
links
administration
on)
The
1 database
II
i
(4 )
retri
snow
For
3
snow data
ins tance
ion
is
snow
method
zable
terms .
high
for snow
method,
improved
z
ss
to
a
The
thm
ons
limi
b)
init
Initi i
ter center
tion
c)
ate
ition matrix
current centers
continue s
)0
us
centers
d)
limit
new
centers
c) ..
e)
is ass
s
f)
centers
4.
(1 )
Snow
[3]
se
e
se
is
a
re
structures
while all
(2)
a ..
inc
s
ons,
cons
se
t
tion, i .. e.,
and the
tion of regions.
snow map retrieval
character manner ..
ed, the graphic
stribution
can be acquired
case, a region
b ..
to
snows
ion
some
some
e
se needs ..
story
Using
ion and
by user
out ..
c.
Visual
Ie
se
satisfying
is
see
5 ..
used
powerful ..
design ..
two modules.
tern without
[1]
R
tern
1986 ..
[2] R . L ..
Mapper
thm,
No.3,
[3]
se
Management
i. and