Hot answers tagged editing
The reason you cannot edit these layers is because it is not a file. It is a map service. What you are seeing is a web service. A web service is data that is hosted on a server elsewhere, that is not your computer. Your computer is going out and getting the data live from OLIVER when you look at it in ArcMap. In this case the data you want to edit is ...
You can achieve this using the Construct Points tool while in edit mode. If you need to do this to multiple features, you could use the Densify tool, then use the Feature Vertices to Points. Keep in mind that this assumes you currently have lines, and not polylines, because ALL vertices (even one's not at your specified densify distance) will also become ...
Instead of cutting out polygons, an alternative is to reshape your polygon (Toggle editing > Edit > Reshape Features) into your desired corridor. The topology should remain intact as no polygons are being removed.
Quantum GIS can read GPX tracks, allow you to edit them over a base layer map (google, openstreetmap, stamen toner, etc) and save in any of a zillion formats. Its Open Source, runs on Linux, Mac and Windows. There is an android port but I think its a bit beta and might be less functional. www.qgis.org I know you said "basic" GPX editor but these things ...
Try this in the python window in ArcMap: points =  for row in arcpy.da.SearchCursor('C:/Temp/line.shp', ["SHAPE@"]): # change this to your source line layer length = int(row.length) for i in xrange(0, length + 10, 10): # assuming units are in meters for feature spatial reference point = row.positionAlongLine(i) ...
You can do this in the Field Calculator, using an expression like: calc(!SHAPE!) and Codeblock: def calc(shape): return arcpy.PointGeometry(shape.firstPoint).distanceTo(arcpy.PointGeometry(shape.lastPoint)) Distance > 0 means not closed. Granted, this will not zoom to the offending vertices.
This has now been fixed in QGIS 2.6. Non-editable widgets are now greyed-out.
One approach I have not seen posted yet is using a buffer of your circles and using either a positve value for the buffer radius if you want the circle to be larger or a negative value for the buffer radius if you want the circle smaller.
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