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Linien auflösen, ohne konvergente Linien aufzulösen?

UnsoughtNine

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Ich habe ein wenig mit arcHydro und verwandten Prozessen experimentiert und bin auf ein Hindernis gestoßen. Ich habe Flussnetzwerke aus den Funktionen Flussakkumulation, Richtung und Flussordnung erstellt. Nach der Umwandlung von Raster in Polygon ist jedes Segment der Flüsse ein einzigartiges Feature innerhalb der Ausgabefeatureklasse. Ich möchte, dass wenn es keine Änderung der Ordnung von einem Segment zum nächsten gibt, es dasselbe Feature bleibt. Einfach genug, auflösen.<\/P>

Das Problem ist jetzt, dass dort, wo zwei Flüsse derselben Ordnung zusammenkommen, um einen Fluss höherer Ordnung zu bilden, die beiden kleineren Ordnungsflüsse zu "einem" Fluss verschmelzen, da sie einen gemeinsamen Scheitelpunkt teilen (ihren gemeinsamen Auslass, der der Einlass des nachfolgenden Flusses höherer Ordnung ist). Schwer ohne visuelle Darstellung zu beschreiben, aber ich hoffe, das war klar.<\/P><\/BODY><\/HTML>

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Arc Hydro

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UnsoughtNine

I ultimately took the problem from a different approach which was somewhat initiated through Dan's comments:

1. Create a point at every vertice in the stream layer

2. Buffer every vertice at a user-specified setback (10m in my case) to move the pour point back from the outlet slightly

2. Create intersecting points where the buffer crosses the stream layer. This creates points at the specified setback.

3. Clip the streams layer with the buffer then identify the smallest order stream of concern within the buffer through a sorted array approach

4. Eliminate those points of orders greater than the minimum identified in the array.

The remaining points are the pour points, set back from the outlet, as I had originally desired. This seems to be a bit more resource-intensive of a process but it appears to be working. Thanks all.

All comments

ChrisDonohue__GISP

If the stream feature class is already dissolved and you have access to an Advanced ArcGIS license level, one option to re-split it only at those junctures is this:

Run Intersect (Analysis) using only your stream feature class (no other inputs, yes only 1 input!) and for the "Output Type (Optional)" settting using "Points". This will produce a point feature class of the stream intersections.
Run Split Line at Point (Data Management) using the points from step 1 and the dissolved stream line feature class.

Intersect—Help | ArcGIS for Desktop

How Intersect works—Help | ArcGIS for Desktop

Split Line at Point—Help | ArcGIS for Desktop

Chris Donohue, GISP

DanPatterson_Retired

I am wondering what option you used for the dissolve The unsplit line option at the very end suggests that a line will only be dissolved when only two lines meet at an end point. If you used the default a point that has 2 or more will be dissolved, if unsplit is used, only points that have 2 lines meeting will be dissolved. Beyond that, the only other thing I can think of is to identify the points in the lines (feature to points) that have 3 or more occurences, then use those to split the lines at those points

UnsoughtNine

The first image is the layer as it converts from raster; with each line segment being it's own feature. The second image is following a dissolve. The 'conflict' areas are those circled in red, where a common vertice has caused two streams of the same order to dissolve together when in fact they only share an outlet. For my purposes, I don't want this to be the case. Hoping the visuals help clarify. Dan_Patterson‌

UnsoughtNine

No this is not a Strahler vs Shreve issue.

The stream polyline layer, as output from the raster to polygon conversion tool. Each segment is it

Following running dissolve and using the order field as the dissolve field. Common vertices combine two streams at a few points. These streams which would ideally be their own features for my purposes.

Hoping the visuals were of some benefit.

DanPatterson_Retired

Just to check, without visuals, this isn't a Strahler vs Shreve issue is it?

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