/// <summary>Convert a ESRI geometry to geojson </summary>
/// <param name="esriPoint">A ESRI point object</param>
/// <returns>A geojson Object</returns>
public static datacontract.geojsonPoint esri2geojsonPoint(IPoint esriPoint)
{
int epsg;
string epsgUri;
if (esriPoint.SpatialReference == null)
{
epsgUri = "";
}
else if (esriPoint.SpatialReference.FactoryCode == 900913 || esriPoint.SpatialReference.FactoryCode == 102100)
{
epsg = 3857;//google mercator
epsgUri = string.Format("http://www.opengis.net/def/crs/EPSG/0/{0}", epsg);
}
else
{
epsg = esriPoint.SpatialReference.FactoryCode;
epsgUri = string.Format("http://www.opengis.net/def/crs/EPSG/0/{0}", epsg);
}
datacontract.geojsonCRS JScrs = new datacontract.geojsonCRS(){
type= "link",
properties = new Dictionary<string, string>() { { "href", epsgUri } }
};
datacontract.geojsonPoint JSpoint = new datacontract.geojsonPoint()
{
type = "Point",
coordinates = new List<double>() { esriPoint.X, esriPoint.Y },
crs = JScrs
};
return JSpoint;
}
/// <summary>Convert a ESRI geometry to geojson </summary>
/// <param name="esriPoint">A ESRI polygon object</param>
/// <returns>A geojson Object</returns>
public static datacontract.geojsonPolygon esri2geojsonPolygon(IPolygon esriPolygon)
{
int epsg;
string epsgUri;
if (esriPolygon.SpatialReference == null) {
epsgUri = "";
}
else if (esriPolygon.SpatialReference.FactoryCode == 900913 || esriPolygon.SpatialReference.FactoryCode == 102100)
{
epsg = 3857;//google mercator
epsgUri = string.Format("http://www.opengis.net/def/crs/EPSG/0/{0}", epsg);
}
else {
epsg = esriPolygon.SpatialReference.FactoryCode;
epsgUri = string.Format("http://www.opengis.net/def/crs/EPSG/0/{0}", epsg);
}
datacontract.geojsonCRS JScrs = new datacontract.geojsonCRS()
{
type = "link",
properties = new Dictionary<string, string>() { { "href", epsgUri } }
};
datacontract.geojsonPolygon JSpolygon = new datacontract.geojsonPolygon() { type = "Polygon", crs = JScrs };
List<List<List<double>>> coords = new List<List<List<double>>>();
IGeometryCollection rings = esriPolygon as IGeometryCollection;
for (int n = 0; n < rings.GeometryCount; n++)
{
IPointCollection4 ring = rings.get_Geometry(n) as IPointCollection4;
List<List<double>> JSring = new List<List<double>>();
for (int i = 0; i < ring.PointCount; i++)
{
IPoint pt = ring.get_Point(i);
List<double> JSpt = new List<double>() {pt.X, pt.Y };
JSring.Add(JSpt);
}
coords.Add(JSring);
}
JSpolygon.coordinates = coords;
return JSpolygon;
}
/// <summary>Convert a ESRI geometry to geojson </summary>
/// <param name="esriPoint">A ESRI polyline object</param>
/// <returns>A geojson Object</returns>
public static datacontract.geojsonLine esri2geojsonLine(IPolyline esriLine)
{
int epsg;
string epsgUri;
if (esriLine.SpatialReference == null)
{
epsgUri = "";
}
else if (esriLine.SpatialReference.FactoryCode == 900913 || esriLine.SpatialReference.FactoryCode == 102100)
{
epsg = 3857;//google mercator
epsgUri = string.Format("http://www.opengis.net/def/crs/EPSG/0/{0}", epsg);
}
else
{
epsg = esriLine.SpatialReference.FactoryCode;
epsgUri = string.Format("http://www.opengis.net/def/crs/EPSG/0/{0}", epsg);
}
datacontract.geojsonCRS JScrs = new datacontract.geojsonCRS()
{
type = "link",
properties = new Dictionary<string, string>() { { "href", epsgUri } }
};
datacontract.geojsonLine JSline = new datacontract.geojsonLine() {type = "Polyline", crs = JScrs };
List<List<double>> coords = new List<List<double>>();
IPointCollection4 nodes = esriLine as IPointCollection4;
for (int n = 0; n < nodes.PointCount; n++)
{
IPoint node = nodes.get_Point(n);
List<double> pt = new List<double>() {node.X, node.Y };
coords.Add(pt);
}
JSline.coordinates = coords;
return JSline;
}
