I have a river shapefile and need to ensure every vertice has a lower elevation that the previous uphill vertice.
I have converted the polylineZ to points using ET GeoWizards.
This gives me a Z value for every vertice.
I have added a field called ElevDiff.
I need to calculate the difference in elevation values from the previous vertice to the next in the attribute table.
If the value is negative, I know the line does not flow downhill at this point.
This is an easy task in Excel but I am wondering if there is a python script or easy way to calculate this using ArcGIS.
I do not have any extensions (i.e. Spatial Analyst, 3D Analyst, Newtwork Analyst).