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Create polygon from string of coordinates

Forum|Forum|1 year ago
January 8, 2024
5 replies
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+5

geovision
Contributor

I have XML file with features I'm trying to read.. that works. Next step is to create a polygon for each feature, I have a string with points that make the polygon. String looks like this:

173363.252 587903.412 173363.369 587902.665 173362.055 587900.798 173363.867 587888.745 173364.007 587887.815 173371.744 587888.843 173368.618 587904.7 173363.252 587903.412

That's a list of x and y coordinates, now I can't figure out a idea to make polygons from it. Any ideas? Do I have to seperate them, create lines and make a polygon from it? Any help is appreciated.

Best answer by dustin

This is what I would do:

With a StringSearcher, use the regex below to extract the coordinate pairs into a list using the All Matches List Name.

([\d.]+) \s*([\d.]+)

Using a ListConcatenator, concatenate the list in a single attribute with a comma as the Separator Character between each coordinate pair.
Use a GeometryReplacer with OGCWKT encoding with the following Geometry Source to build the geometry.

POLYGON((@Value(_concatenated)))

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+20

joepk
Influencer
Forum|Forum|1 year ago
January 8, 2024

Hello, the workflow outline you sketched is indeed the way to do this. I did the following:

There is probably an easier way to do this, but this works pretty good.

Hope this helps

P.S: RD New spotted 😎 veel plezier!

Upvote

+31

dustin
Influencer
Best Answer
Forum|Forum|1 year ago
January 8, 2024

This is what I would do:

With a StringSearcher, use the regex below to extract the coordinate pairs into a list using the All Matches List Name.

([\d.]+) \s*([\d.]+)

Using a ListConcatenator, concatenate the list in a single attribute with a comma as the Separator Character between each coordinate pair.
Use a GeometryReplacer with OGCWKT encoding with the following Geometry Source to build the geometry.

POLYGON((@Value(_concatenated)))

Upvote

+20

joepk
Influencer
Forum|Forum|1 year ago
January 8, 2024

This is what I would do:

With a StringSearcher, use the regex below to extract the coordinate pairs into a list using the All Matches List Name.

([\d.]+) \s*([\d.]+)

Using a ListConcatenator, concatenate the list in a single attribute with a comma as the Separator Character between each coordinate pair.
Use a GeometryReplacer with OGCWKT encoding with the following Geometry Source to build the geometry.

POLYGON((@Value(_concatenated)))

:o Very cool!

Upvote

+5

geovision
Author
Contributor
Forum|Forum|1 year ago
January 9, 2024

This is what I would do:

With a StringSearcher, use the regex below to extract the coordinate pairs into a list using the All Matches List Name.

([\d.]+) \s*([\d.]+)

Using a ListConcatenator, concatenate the list in a single attribute with a comma as the Separator Character between each coordinate pair.
Use a GeometryReplacer with OGCWKT encoding with the following Geometry Source to build the geometry.