How can I tell if a parcel map has true curves?

[ChrisBaze]

I'm trying to find out if I can download this parcel map in a format that has true curves: https://honolulu-cchnl.opendata.arcgis.com/datasets/parcels-all/explore 

[pt_instructor · Accepted solution]

Hi Chris. The proof would be in the attributes of the COGO-enabled, parcel line feature classes. That is, upon selecting a "curve" feature, you would see attribute fields such as radius and arclength, populated with non-null values.

Boundary line information does not appear to be available in the Oahu map. However, the parcel polygons on curved boundaries are clearly showing segmented, short-length straight lines that are offset from each other slightly to emulate a curve, when viewed a small scales. In other words, this data does not appear to be using true curves.

[AmirBar-Maor]

@ChrisBaze 

If you are using Pro 3.5 and above, you can make use of the 'vertices and nodes' functionality.

1. Press the button and go into settings

2. Check the option to display true curves (uncheck other irrelevant options) 

[ChrisBaze]

I don't have ArcGIS and am ultimately trying to get this into Civil 3D. Any chance that you could export to a file format that I could use?

[AmirBar-Maor]

@ChrisBaze 

If you want to export all the true curves here is one way:

1. Add a field on the lines table called something like 'CurveCount' as a long integer
2. Use the Calculate Geometry tool to calculate the number of curves in each line
3. Use Select By Attributes to select the lines that have more zero curves
4. Export the selection to a format of your likings, like a DWG and use XREF to include it in your drawing

If you see any line that has more than 1 true curve, you might want to look into it.

Are you using Civil3D to edit parcels as demonstrated in this blog?

https://www.esri.com/arcgis-blog/products/autocad/data-management/connect-gis-and-cad-teams-on-parce...