[Manifold-l] Points to Lines - v 7x

[Springfield Harrison]

Hello James:

         This looks promising but fails (?), not sure why.

         I tried Linking the table, the Import option doesn't offer the 
create line function (why?).  I have a Point Order field but don't 
understand the need for "Grouping".  Several queries were created, I think 
the process changed the Projection (?).

         From one of the query components I extracted the Query that 
apparently powers the whole operation.  I commented out the Option line 
that changed the Projection, deleted the Group By parameter, ran the query 
and got a single field, single record table:

                         GeomData <geom, line, branches: 1, coords: 6430>

         I tried copying and pasting this as a drawing but those options 
are everywhere grayed out.  It looks like it could be a line with 6430 
nodes.  My XLS table has NAD83 UTM coordinates.

         There is no useful Help for the ConvertToLine syntax or the Link 
Table "Make Line" feature or I could likely make this work based on your 
suggestion.  Is this stuff documented elsewhere?

         Sorry to pester you with this but Help seems to be silent where it 
is needed most.  I have just installed 7x plus update.



At 14/09/2006 08:20 PM Thursday, JBurn_GIS wrote:

>Make sure that you have a table w/ your point coordinates, a "grouping" 
>column (a default "0" field will do) and a field with the point 
>order.  Import a drawing from your table - you will then have the option 
>to create a line from the points.  Make the line id your "grouping" field, 
>and use your order field for the order.  You should now get your 
>line.  Unlink it and perform your simplify to your desired precision.
>
>Cheers.
>---------------
>James Burn BSc, GIS(pg), AScT
>----- Original Message -----
>From: <mailto:stellargps at shaw.ca>Springfield Harrison
>To: 
><mailto:manifold-l at lists.directionsmag.com>manifold-l at lists.directionsmag.com
>Sent: Thursday, September 14, 2006 8:24 PM
>Subject: [Manifold-l] Points to Lines - v 6.5
>
>Hello All:
>
>         I have 6400+ points, 20 m apart that I need to join into a 
> line.  Can't find a Transform or Overlay command that seems to apply 
> although I'm sure it's there somewhere.
>
>         Also, I need to thin/weed/decimate the resulting line into far 
> fewer points.  I think Simplify will work but I need the line first 
> (?).  Any thoughts here, also?
>
>                 Many TIA, cheers . . . . .
>
>                            -= Springfield Harrison, B. Sc., Stellar GPS & 
> Mapping =-
>                                              -= Sidney, B. C. Canada =-
>
>                                                    www.StellarGPS.ca
>
>
>
>
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                      Spring Harrison, B Sc
                                      -= Stellar GPS & Mapping =-
                                -= 103 - 9800 McDonald Park Road =-
                                        -= Sidney, B. C. Canada =-

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