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repair geometry - self intersections

danbecker

Several thousand polygon feat. classes contain geometry problems, almost all self intersections.

I need to repair the self intersections for a variety of reasons:
1. negative area calculations
2. I need to remove all arc segments from all features; to do so with only an ArcView license, I have to run shape_density.cal, (/www.ian-ko.com) on shape field. With geom. issues this does not run correctly.
3. Oracle database that features are being loaded into checks for geom. issues

After a self intersection(s) is identified, the repair geom. tool is ran. However, the resulting features differs significantly from the original feature. I understand the self intersections polys are dissolved...any way to correct this? i.e. repair geometry but not significantly alter the feature?

I attached an image of the original feature and after the geom. had been repaired.

thanks

repair_geometery.jpg

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PaulLohr

This has been a helpful thread. The Integrate geoprocessing tool took care of self intersections which could not be removed by the Repair Geometry tool. In my case it was set very low - at 0.01 feet. I would think setting this properly depends on how tight or loose the self intersections are. This was with version 10.2.2 and a file geodatabase polygon feature class.

DanPatterson_Retired

a quick answer .... redo the calculation for area etc in a new field in the table ... best test

JensWeißer

is there any loss of data using the REPAIR GEOMETRY Tool?

The output of my thesis is an area and I used this tool sometimes, that's why it would be good to know,

if the created area is smaller than the area which could be created without using this tool?

ChrisSnyder

Too bad you can't set tolerances

Do you mean after the fact? Just re-copy the copies with the CopyFeatures tool (or whatever tool) and set the tolerance and resolution settings to the ones I specified in the environment settings (general section). These are the ESRI defaults by the way - the ones you get if you create a brand new FC from scratch. The "METER" units get automatically translated to whatever map units your FCs are defined as.

danbecker

thanks!

confirmed. If I create a new feat. dataset with smaller tolerance, (0.0000000089 degrees) then import the feat. classes, no self intersections are found.

Too bad you can't set tolerances; going to have to recreate thousands of feat. datasets; then import the feat. classes.

ChrisSnyder

Note sure why, but:

1. If I copy data out of our coprorate SDE database to a FGDB and retain the original 1ft XY tolerance I have tons f self-intersection errors.

2. If I copy data out of our coprorate SDE database to a FGDB but specify finer tolerance and/or resolution (example: 0.001 Meters) I have no self-intersection errors.

Starting years ago, I use option #2.

gp.XYTolerance = "0.001 METERS"
gp.XYResolution = "0.0005 METERS"

danbecker

more info....

If I create a new feat. dataset, then import the feat. class that contains self intersections, and re-run check geometry; no errors are reported!

Could someone explain?

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