topic Selecting networks based on strahler order in ArcMap Questions

Selecting networks based on strahler order

AleksanderZarebski — Sat, 29 Jan 2022 14:46:23 GMT

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

Re: Selecting networks based on strahler order

DanPatterson — Sat, 29 Jan 2022 16:47:52 GMT

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

Re: Selecting networks based on strahler order

AleksanderZarebski — Sat, 29 Jan 2022 17:38:20 GMT

Re: Selecting networks based on strahler order

AleksanderZarebski — Sat, 29 Jan 2022 17:39:32 GMT

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

Re: Selecting networks based on strahler order

JayantaPoddar — Tue, 01 Feb 2022 16:03:09 GMT

Step-1: Select by Attribute

where grid_code >= 3

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).