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

[Bob Heitzman]

A simplified version of the above is to copy the table to the
clipboard and Paste As... Drawing.  Doesn't generate all the annoying
extra components either.  You do need to have some field to use to
group the points into lines. If you just have a single set of points
to make one line add a lineID field via Excel or some other tool.

And as you noted Drawing, Simplifiy (drawing menu) will work but the
Normalize, Topology transform (via the drawing's table window) should
probably be used first. Set the desired precision for the drawing
first using the Drawing, Properties dialog (right click in Project
pane).

On 9/15/06, Henry Holland <hholland at gmail.com> wrote:
>
>
> Assuming you have a Table component in Manifold which contains your points,
> if you go Import/Drawing, then This Project(), on the Import Data dialog at
> the bottom you can select the Line ID, which is the 'Group By' column for
> the query. Once you've selected a column to group by, the Coordinate Order
> field on the dialog activates and you can select the node order ('Order By'
> column for the query).
>
> I'll try and explain how and why it works the way it does (or my
> understanding of it). If you have a set of points that you want to turn into
> lines (or one line in your case), you are aggregating (collecting) those
> points into lines. Each line consists of a set of points (nodes). The Import
> function needs to know which points belong to which lines, hence the Group
> By/Line ID column. The Order By clause is needed so you don't get spaghetti
> lines going all over the place (unless that is how you walked the line with
> the GPS ;-).
>
> Hope that makes sense.
>
> Henry
> ps. The projection thing is a different matter. I have so far been limited
> to using lat/long points so it has worked fine for me.
>
> __________________
> www.mapthis.co.za
>
>
> -----Original Message-----
> From: manifold-l-bounces at lists.directionsmag.com
> [mailto:manifold-l-bounces at lists.directionsmag.com] On
> Behalf Of Springfield Harrison
> Sent: 15 September 2006 09:23 AM
> To: manifold-l at lists.directionsmag.com
> Subject: Re: [Manifold-l] Points to Lines - v 7x
>
>
> 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: Springfield Harrison
>  To: 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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>                                      -= Stellar GPS &
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