Hi Myles,
I have done this by the following methods:
1) What is the best method of making the many separate polylines
into single
closed catchments (aka regions)?
Create a new layer called Catchment Poly or something similar and make it
editable in the same mapper with your line segments. Select all of the
segments that make up a single polygon, copy and paste them into the new map
layer. With the lines still selected, do Objects>Combine. Then
Objects>convert to region. Assuming your polylines were all connected
you'll have a polygon. The reason for the pasting into a new file is
because you'll need some of the same polylines again for shared borders.
This method could be too much work dpending on the dataset complexity, but
it is an option.
2) What is the best method of querying the DWG population text into
a column of
a MI table?
The following MapBasic string will do this - also accessible through
update column dialog...Add Column "poly" (id) From text Set To
objectinfo(text.obj,3) Where intersects
3) What is the best method of doing a "proportional allocation" of
the
population figures from that files mentioned above to another
catchment table
that I already have - noting that the boundaries between my existing
table and
the meshblock table don't always match?
Another MapBasic statement, also accessible through update column
dialog...you need a pop column in the poly table to fill with the
proportional pop values, then try this...
Add Column "poly" (pop) From pop Set To proportion sum(pop) Where intersects
Good luck.
Will Mitchell
GIS Manager
The Environmental Company, Inc.
2496 Old Ivy Rd
Charlottesville, VA 22905
ph 804.295.4446
fx 804.295.4435
http://www.tecinc.com
> -----Original Message-----
> From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, April 26, 2000 4:55 PM
> To: [EMAIL PROTECTED]
> Subject: DWG Files into MI
>
>
>
> People,
>
> Can someone please help me out?
>
> I have a DWG file which contains meshblock population catchment boundaries
> (each
> drawn as a number separate polylines). I have another file which contains
> population figures for each of these catchments. When I open these files
> in MI
> using the Universal Translator, the population figures are a text
> reference
> located at the centroid of each of the catchments and thay contain no
> other
> attributes. The three questions that I have are:
>
> 1) What is the best method of making the many separate polylines into
> single
> closed catchments (aka regions)?
>
> 2) What is the best method of querying the DWG population text into a
> column of
> a MI table?
>
> 3) What is the best method of doing a "proportional allocation" of the
> population figures from that files mentioned above to another catchment
> table
> that I already have - noting that the boundaries between my existing table
> and
> the meshblock table don't always match?
>
>
> Thanks in advance.
>
> Myles Lind
>
>
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