private static IFeatureClass GenerateWorknArea(string poterniallyVisibleAreaFCName, string pointsFCName, string workinAreaFCName)
{
var points = EsriTools.GetFeatreClassExtent(GdbAccess.Instance.GetCalcWorkspaceFeatureClass(pointsFCName));
var poterniallyVisibleArea = EsriTools.GetFeatreClassExtent(GdbAccess.Instance.GetCalcWorkspaceFeatureClass(poterniallyVisibleAreaFCName));
poterniallyVisibleArea.Project(EsriTools.Wgs84Spatialreference);
points.Project(EsriTools.Wgs84Spatialreference);
var combined = EsriTools.GetEnvelopeOfGeometriesList(new IGeometry[] { points, poterniallyVisibleArea });
var workinAreaFC = GdbAccess.Instance.GenerateTempStorage(workinAreaFCName, null, esriGeometryType.esriGeometryEnvelope, null, false, true);
var area = workinAreaFC.CreateFeature();
area.Shape = combined;
area.Store();
return(workinAreaFC);
}