if you have closed polylines, you can always click onto them and the Property-Window shows you the area. If you change the polygon and again select it, you see the modified area. Is that live enough?
Or what's the reason to save a value into data that already is available?
- alfred -
if the data is in an MDB-file you will have to do some export of the polygons. If you use the command _MAPEXPORT to export closed polylines you also can select the area of the polylines as an attribute to be included in the export.
If you are speaking from objects that you have connected via FDO, you can create a calculated field that creates a new column in your data. That column is just a virtual one, to get it exported you can e.g. use bulk-copy, with that function the virtual columns get real ones.
- alfred -
but that is still static, correct?
What about bulk copy to a .SHP and then use the .DBF table as a read-only link into the Access database? Then if folks move the polygons from a FDO connected SHP in Map, as long as the changes are saved back through the connection, the .dbf would be more or less "live".
Well, without Autocad I think it's not possible to change dynamically the "area" Object Data.
If the stuff should stay static, there are several methods to achieve the goal: the mentioned .DBF, an export to Google Earth with attributes, a GeoDWF file, and maybe others.
My read was that the database users need access to areas as a result of the geometric shapes - hence my thoughts to convert to a .SHP where you can manage the geometry with Map and have "read only" access from the database users - that the database users won't be able to change the geometric shape but need to query areas (i.e. lot size or average lot size of multifamily residential development)
Perhaps our OP can feed us more information about specific needs....
Aargh.... open mouth & insert foot....
The dbf stores the tabular information of the shapefile - the .shp portion of the shapefile stores geometry. I was thinking that the .dbf had geometry in it, but you'd have to create a calculated field in the .shp or use bulk copy from 1 shp to a 2nd shp and populate the area in the tabular data based on the geometric area. So, it would require a manual update from map to push into the shapefile's .dbf. An intermediate step (or 2)
Why do things in one step when 5 or 6 will suffice.....???????
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