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Creating Multipart Objects

JamesCarroll7

Hi all,

I have a polyline shapefile layer in ArcGIS Pro which shows the road system of a proposed development. All of the roads are on this one layer, but I want to break it down into different selectable sectors for different parts of the development. I used the Multipart to Singlepart tool to break down the shapefile, but I can't find a tool to allow me to select certain polylines to group together (I essentially want to create the equivalent of a block in AutoCAD where all the roads in Sector 1 are grouped together, all the roads in Sector 2 are grouped together etc.). Is it possible to do this in GIS?

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Accepted answers

danretired

not sure if you want the features to remain in the same layer or not. If you want separate layers for each grouping see

Split By Attributes (Analysis)—ArcGIS Pro | Documentation

or if you want to split by using another geometry layer Split (Analysis)—ArcGIS Pro | Documentation

The opposite of multipart to singlepart is

Dissolve (Data Management)—ArcGIS Pro | Documentation

All comments

JamesCarroll7

Thanks for that David, very helpful, I appreciate it!

JamesCarroll7

Many thanks Dan, that worked a treat. I do need all of the multipart features to be in one layer, but I used the 'Merge' tool to do that once I had all the multipart features created.

DavidSolari

Like Dan said, Dissolve with the "sector" field should be enough. If you need a more specific workflow, here's an arcpy function that'll condense a bunch of geometries into one multipart:

import ujson
def reduce_geoms(geoms: list[arcpy.Geometry]) -> arcpy.Geometry:
    iter_geom = iter(geoms)
    first = next(iter_geom)
    assert first.type != "point"
    retval = ujson.loads(first.JSON) 
    has_curves = "curvePaths" in retval
    path_key = "curvePaths" if has_curves else "paths"
    for g in iter_geom:
        gson = ujson.loads(g.JSON)
        paths = None
        if "curvePaths" in gson:
            paths = gson["curvePaths"]
            if not has_curves:
                retval["curvePaths"] = retval["paths"]
                del retval["paths"]
                path_key = "curvePaths"
        else:
            paths = retval["paths"]
        retval[path_key].extend(paths)
    return arcpy.AsShape(retval, True)

danretired

not sure if you want the features to remain in the same layer or not. If you want separate layers for each grouping see

Split By Attributes (Analysis)—ArcGIS Pro | Documentation

or if you want to split by using another geometry layer Split (Analysis)—ArcGIS Pro | Documentation

The opposite of multipart to singlepart is

Dissolve (Data Management)—ArcGIS Pro | Documentation

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