# Need help using geometry to test whether point is within a polygon

Question asked by rastrauch on Mar 16, 2016
Latest reply on Mar 16, 2016 by rastrauch

Back in Avenue days, I was able to use something like

```if ((checkPoly.Contains(testline).Not)) then  ...
```

To test wither my line segment (testline) was contained within the study polygon (checkpoly).  I'm now trying to do the sam type of test use the .within method.

I have created my line geometry and polygon geometry, but I'm receiving  Runtime error.  I have also tried it with a pt geometry.  All three geometries are in the same spatial reference and should return a "true" in both cases.  As powerful as geometries are and as often as I use them, I never seem to be able to get the "light bulb" to go off in my head....so any suggestions are welcome.  I have looked at other threads including https://community.esri.com/thread/69044#comment-400410 and may pursue that, but my guess is it is something simple I am missing.

```>>> polyGeom = arcpy.CopyFeatures_management(inStudy, arcpy.Geometry())
... ptGeom = arcpy.PointGeometry(arcpy.Point(ptX, ptY, 0, 0, ptid))
... tmpTrans = geo.segmentAlongLine(startDist, endDist)
...
... print("check for pt within poly")
... ptGeom.within(polyGeom)
... print("check for line within poly")
... tmpTrans.within(polyGeom)
...
check for pt within poly
Runtime error
Traceback (most recent call last):
File "<string>", line 6, in <module>
File "c:\program files (x86)\arcgis\desktop10.3\arcpy\arcpy\arcobjects\arcobjects.py", line 771, in within
return convertArcObjectToPythonObject(self._arc_object.Within(*gp_fixargs([second_geometry])))
ValueError: [<geoprocessing describe geometry object object at 0x1E43D4E0>]
>>> print("check for line within poly")
... tmpTrans.within(polyGeom)
...
check for line within poly
Runtime error
Traceback (most recent call last):
File "<string>", line 2, in <module>
File "c:\program files (x86)\arcgis\desktop10.3\arcpy\arcpy\arcobjects\arcobjects.py", line 771, in within
return convertArcObjectToPythonObject(self._arc_object.Within(*gp_fixargs([second_geometry])))
ValueError: [<geoprocessing describe geometry object object at 0x1E43D4E0>]
>>>
```

Sorry about the formatting.....I was trying to include the errors.  Thanks.

tagging python snippets  in case anyone has any snippets already to do this.