The scenario is that there are points on a grid with intervals of 1000m covering an area of hundreds of square kilometres. I want to find routes on a road network to any one of these points. A road network built with Network Analyst works fine and the points are also built into the network. However the points do not intersect with the roads and sometimes offset 10s to 1000s of metres so no solution/route can be found to these points. How can routes be solved to the closest part of a road nearest to these points if they are loaded as stops?
In ArcGIS Network Analyst, during the add locations procedure (for any kind of locations, like stops or barriers), you can set:
I believe that setting generous search tolerance (the size of your grids?) might solve your problem, yet, notice that if a point is too distant from the network, the chosen nearest network element might not be the most accessible, therefore check your results before using them. If that happens you might move your points a bit, or add a valid point that you know it will be more accessible to the pretended one.
Update: Another option, would be to improve your network for those specific cases\areas (e.g. add unpaved or footpath roads that connect to your point).