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| GeoCommunity Mailing List |
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| Subject: | RE: [gislist] GDB 2 SHP conversion |
| Date: |
09/23/2004 10:10:02 AM |
| From: |
True, Cynthia D. |
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This is sort of like asking "How do I get to the moon in a 747?" A 747
was not designed to go to the moon, but with a lot of retro-fitting you
could probably make it into something that could go to the moon. A
shape file was not designed to be a RDBMS. With a lot of effort, you
could make something that works like a RDBMS. The reason that ESRI came
up with the GDB, is because it's hard to make a shape file work as a
RDBMS.
Having said that, the National Hydrography Dataset people built a RDBMS
in ArcView3 several years ago. If you check some of the old
documentation on that, it may point you in the right direction. I think
it runs on coverages, but it had extensions that would create the joins
and relates in ArcView3.
http://nhd.usgs.gov/tools.html#toolkit
Good Luck,
dt
-----Original Message-----
From: gislist-bounces@lists.geocomm.com
[mailto:gislist-bounces@lists.geocomm.com] On Behalf Of Richard Nicoll
Sent: Thursday, September 23, 2004 6:00 AM
To: gislist@lists.geocomm.com
Subject: [gislist] GDB 2 SHP conversion
Hi Listers
I am sure you are all aware that because the GDB sits in a RDBMS it
allows attribute relationships to be developed (such as one-to-many and
dependables). Of course, in the basic SHP format each object can only
have one 'record' (row in the dbf) as the SHX enforces a one-to-one
relationship class.
What I am interested in is how to handle translations between GDB and
SHP with respect to these relationships. Are you forced to duplicate
objects in the SHP to store more than one attribute? Or is there
another way of achieving this conversion? ESRI do not seem to have
placed much importance on this problem, just the basic ArcCatalog
tools...
If anyone can point me to any research, documentation, advice, etc on
this issue it would be greatly appreciated.
Thanks,
Rich
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