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Typical sequence when using TCalc is like this:
The SkipLinkList can be used to ignore certain links in the route calculations.
Eventually set MaxCost, if you want to create a smaller isochrone than otherwise.
MaxSpeed can be used to override the speed for the network, in case of slow vehicles.
NoDriveThrough can be set to avoid areas, where you are not allowed to drive through ("no access").
Finally call one of the actual isochrone methods, possibly followed by additional query methods:
If you just want cost:
If you want cost and the route:
Matrix methods: (to TMatrix)
Matrix methods: (output to GIS files)
Methods for isochrones (see also here):
3.AlphaShape (Pro only)
It is worth noting that Cost in TNetwork is different from Cost in TCalc:
•In TNetwork it is a generalized cost for a single link (or turn delay), much similar to the length or time of a link.
•In TCalc it is the result of a route / isochrone calculation from a starting point to somewhere else. The cost can be either distance (SetShortest), time (SetFastest) or "cost" (SetCheapest), depending upon which criteria has been set up.