Apoyo de tareas
Tutorial for Beginners
Introduction
Arc
Marine
(or
the
ArcGIS
Marine
Data
Model
-‐
MDM),
is
a
geodatabase
model
tailored
specifically
for
the
marine
GIS
community.
Created
by
researchers
from
Oregon
State
University,
Duke
University,
NOAA, the
Danish
Hydrologic
Institute
and
ESRI,
work
on
the
data
model
began
in
2001
in
response
to
three
major
needs
by
the
marine
GIS
community:
(1)
provide
an
application-‐specific
geodatabase
structure
for
assembling,
managing,
storing
and querying
marine
data
in
ArcGIS
8/9,
(2)
provide
a
standardized
geodatabase
template
upon
which
develop
and
maintain
marine
applications,
and
(3)
provide
a
better
understanding
of
ESRI's
new
geodatabase
data
structure.
Arc
Marine
was
designed
to
be used
as
a
geodatabase
template
for
marine
GIS
users.
This
template,
like
all
geodatabases,
is
an
organized
hierarchy
of
data
objects.
These
data
objects
are
a
collection
of
feature
data
sets,
feature
classes,
object
classes
and
relationship classes.
Specifically,
a
feature
data
set
is
a
collection
of
feature
classes
that
share
a
common
spatial
reference.
The
spatial
reference
is
part
of
the
definition
of
the
geometry
field
in
the
database.
Accordingly,
a
set
of
transect
survey points
stored
in
the
coordinate
system
NAD83
UTM
Zone
4
could
not
be
in
the
same
feature
data
set
as
geographic
latitude/longitude
coordinates.
In
the
geodatabase,
all
objects
represent
a
real
world
object
such
as
a
marker
buoy
or
lighthouse, and
are
stored
in
a
row
in
a
relational
database
table.
Object
classes
are
not
represented
geographically;
however,
they
can
be
related
to
spatial
information
through
a
relationship
class.
Conversely,
all
of
the
features
in
a
geodatabase
are geographic
objects
that
have
a
defined
spatial
location.
Basically,
a
feature
is
just
like
an
object
but
it
also
has
a
geometry
or
shape
column
in
its
relational
database
table.
The
Arc
Marine
geodatabase
can
store
a
range
of
data sets,
from
the
small
to
medium
data
sets
of
personal
geodatabases,
to
the
very
large
geodatabases
managed
with
the
help
of
ArcSDE
(Arc
Spatial
Database
Engine).
Arc
Marine
was
generated
in
a
series
of
steps,
beginning
with
the
definition of
feature
datasets,
classes,
attributes,
and
relationships
in
a
Unified
Modeling
Language
(UML)
diagram
created
in
Visio
2000.
The
UML
diagram
was
then
converted
into
an
XMI
(XML
Metadata
Interchange)
format,
which
is
an
equivalent
tabular
...
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