Selecting networks based on strahler order

[AleksanderZarebski]

Hi there,

I was wondering if anyone could help me with my problem. I have a shapefile with polylines which have associated attributes including the Strahler order. I was wondering if anyone knew how to select only networks which had a minimum order of 3. 

I have tried using the select by attributes function where "Stream_Ord" >= 3 however this does not seem to work as it only selects segments of fluvial networks not the whole network.

Many thanks in advance,

Alex

[DanPatterson]

image is small to see details, but strahler applies to segments... what does <= 3 yield?

How Stream Order works—ArcGIS Pro | Documentation

The image suggests you might be looking for the left image but where the network exits.  You would have to query those segments directly then query for those above

[AleksanderZarebski]

i was assuming it would select the rest of the network as the polylines, evidently that is not the case

[JayantaPoddar · Accepted solution]

Step-1: Select by Attribute 

where grid_code >= 3

JayantaPoddar_0-1643495993912.png

Step-2: Select By Location

Input Features: Str_order layer

Relationship: Intersect

Selecting Features: Str_order layer

Selection Type: Add to current selection

Click Apply multiple times (till the number of selected features in your attribute table doesn't increase any more).

JayantaPoddar_0-1643731326379.png