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giswr
> events
> feb 2000 giswr
conference > thursday breakout sessions
Thursday Breakout Sessions
The following are questions that were
presented and addressed during the discussion regarding
object model design.
General questions for all groups:
(1) Is the basic scope of the Arc Hydrology Data
Model sound (i.e. does it cover the right subject areas)?
Should the model be extended to cover a larger domain or
is the present scope sufficient?
(2) Are there classes and attributes which need to
be added?
(3) Are there classes or attributes which could be
omitted?
(4) What methods are needed?
Water Mapping and Linear Referencing Group:
(1) Is a national stream addressing system needed?
How could this be resolved with State and local stream addressing
systems?
(2) If so, how best should it be constructed:
- Using relative addressing on river reaches (NHD mode)
- Using absolute addressing on rivers (traditional river
mile mode)
(3) How do we resolve multiple instances of the same
river line (e.g. derived
- rom DEMs for hydrology and from TINs or orthophotos
for hydraulics).
- Do we insist on having a single river line, or try to
relate the positions of the
- Same entity on multiple lines?
(4) Are there innovative methods that could be used
for stream addressing e.g.
Water Modeling Group:
(1) Can we conceive a core §hydroobject¥ set in UML
like the ArcObject library that could be used as a basis
for building a hydrologic object library?
(2) If so, can this be developed from the ArcObject
set or should it be conceived Independently?
(3) Is there value in attempting something for design
of an object model framework for hydrologic processes within
the Consortium like the spatial data modeling effort that
is now ongoing? If so, how could this be done?
(4) How do we incorporate this historic work on Spatial
fields (Grids, TIN)?
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