Spatial Analysis tool for calculating length of polyline

Question

Hi,
Please some one share how to write code for my requirement in ArcGIS Desktop.
My requirement
-To calculate lenghth of a polyline(with conditions)
-My polyline is passing(Overlaping) through diffrent polygons.
- I want to calculate length of polyline seperatly crossing on each polygon(overlaped lenght of polyline in each polygon)  . 
I have three Polygon layers and one polyline.
polyline is passing through each polygon layers.
please share some ideas.

yatendrajaiswal · Answer

Hope This Helps
In This example onle road layer and 2 polygon layers are on map.
user selecting road on map.
loop through selected roads.
using spatial filter find  intersected polygons with road 
loop through all intersected polygon.
using topological operator to get intersected road in each polygon and its lenght
 
display result

{
IEnumFeature penum;
IFeature Polyfeat;
IPolyline ppoly;
ISpatialFilter psp;
int linelen;
int polygon1len;

int polygon2len;

penum = mxd.FocusMap.FeatureSelection as IEnumFeature;
Polyfeat = penum.Next();

while (Polyfeat != null)
            {
                if (Polyfeat.Class.AliasName == "ROAD")
                 {

ppoly = Polyfeat.Shape as IPolyline;
                    MessageBox.Show("Road = " + ppoly.Length);
                    psp = new SpatialFilter();
                    psp.Geometry = ppoly;
                    psp.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;
                    for (int i = 0; i <= mxd.FocusMap.LayerCount - 1; i++)
                    {
                        IFeatureLayer polylayer = mxd.FocusMap.get_Layer(i) as   
                            ESRI.ArcGIS.Carto.FeatureLayer;
                        IFeatureClass polyclass = polylayer.FeatureClass;
                        if (polyclass.ShapeType == esriGeometryType.esriGeometryPolygon)
                        {
                            IFeatureCursor polycur = polyclass.Search(psp, false);
                            IFeature polyfeat = polycur.NextFeature();
                            while (polyfeat != null)
                            {
                                //ITopologicalOperator polytopoop = polyfeat.Shape;
                                ITopologicalOperator lineoperat = ppoly as ITopologicalOperator;
                                IGeometry linegeom = lineoperat.Intersect(polyfeat.Shape, esriGeometryDimension.esriGeometry1Dimension);
                                IPolyline newpoly = linegeom as IPolyline;
                                if (polyfeat.Class.AliasName == "Polygon1")
                                {
                                    polygon1len += newpoly.Length;
                                }
                                else
                                {
                                    polygon2len += newpoly.Length;
                                }
                                linelen += newpoly.Length;
                                //MessageBox.Show("" + newpoly.Length);

polyfeat = polycur.NextFeature();
                            }

}
                    }
    MessageBox.Show("Road name = " + ppoly.Length + ", INTERSECTION LEN = " + linelen + ", Polygon1 " + polygon1len + "(" + (polygon1len * 100) / linelen + "%) , Polygon2 len " + polygon2len    + "(" + (polygon2len * 100) / linelen + "%)");

}
                Polyfeat = penum.Next();
                linelen = 0;
                polygon1len = 0;
                polygon2len = 0;
            }
}

Thanks & Regards
Jassi...

ChrisWelch · Answer

I don't know how to do it, but I would try figuring out at which vertex the line snaps to a polygon and summing the distance between vertices until you get to another point where it snaps.

So if it enters at vertex 20 and exits at 25, sum the distance from 20-25.

Just a thought.

yatendrajaiswal · Answer

To get the help you need, please tell us the version you are programming for (9.2, 9.3.1, 10), minimum license level that the program must support (ArcView, ArcEditor, ArcInfo) and the preferred programming language you want it writen in (VBA, VB .Net, C .Net, etc).

Hi,
Thanks for reply
Its for ArcInfo 9.2 in C#...