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Creating a parcel fabric and what happens to curves

HeatherHanson

I am trying to understand the "why". To test the parcel fabric creation process, I did one city from our county. I used polygons to build the fabric in 3.4 and went through all the steps. We did not have fabric in ArcMap.

Here is an example of the problem. In ArcMap, there is this curve, that appears to be a correct real curve.

When it is built in Pro for the parcel fabric, the curve is gone and the north and west lines are altered as well. However, you can see the neighboring parcel did retain the curve.

We want to clean up our data in ArcMap to make the smoothest transition possible to fabric. What am I missing? Why was this curve missed?

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Parcel Editing

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AmirBar-Maor

@HeatherHanson

That does not look right!

Are you able to upload a few polygons to this thread and/or open a technical support issue?

It is also a good practice to run the geoprocessing tool 'Check Geometry' or 'Repair Geometry'.

I am curious if that was really a true curve and why it transformed into a straight line. Does this happen in more places?

MikeVolz

Amir:

Is there a tool that can detect whether an object is a true curve or just a densified line that looks like a curve?

AmirBar-Maor

@MichaelVolz

Yes - From the quality tab you can use the parcel layers to show line or polygon vertices

Densified curves will look like this:

And for those using 3.5 (or higher) you can use the Vertices and Nodes display

That shows 'true curves' and vertices:

You can use the Simplify By Straight Line and Circular Arc geoprocessing tool to process polygons and lines (together) in order to convert them to true curves (within a fitting tolerance)

And the result for that example:

HeatherHanson

Yes it does occur in multiple places. Here's another example.

AcrMap:

ArcGIS Pro:

MikeVolz

Amir:

Does the Parcel Fabric have known issues with curves that are bisected by lines?

AmirBar-Maor

@MichaelVolz

The parcel fabric controls SIMPLE feature classes. So there is nothing SPECIAL for curves that participate in a parcel fabric.

Like any boundary line, you can have another line break the curve into 2 seperate features:

Or not:

That is a business decision. For example, you might want to be true to the 'System Of Record' for surveyed lots, but show the Tax Parcels differently in the Tax Map.

HeatherHanson

@AmirBar-Maor here is the sample shapefile of the 4 lots in my 2nd example.

SampleCurveLots.zip

AmirBar-Maor

@HeatherHanson

Shape files do not support true curves so I recreated them as part of the data migration process. A file GDB is a much better format.

Here is a glimpse of the migrated data. You can see the true curves in orance (using the 3.5 new Vertices and Nodes toggle):

As you can see, Build did not collapse any curve.

If you would like we can setup a meeting to review your migration process and figure it out. To schedule, please DM me.

Otherwise technical support is always there to help.

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