Latest Contributions by MelindaMorang

Are you doing the workflow manually at this point?  You could reduce the amount of work you need to do by automating the procedure using Python or Model Builder.  I don't know that this would reduce the overall time, but at least you could press start and then take a lunch break.  Does this seem like something you might want to do? ... View more

I don't completely understand your workflow, but basically this is what you need to do: In ArcGIS Pro, go to the Backstage area (hit the blue Project button), and click the Python option on the left:   Click Manage Environments to clone your default environment. Once that's done and the new environment is activated, click the Add Packages button. Search for networkx.  You should be able to click the item for networkx in the list and install it. After that, I think you should be good to go. ... View more

Yes, that's exactly what it means.  The OD Cost Matrix calculation determined that the fastest route between the origin and the destination was just to walk, so it returned the walk time. ... View more

It is not unexpected to get different results with ArcGIS Online and your own network.  The network dataset used by ArcGIS Online is a comprehensive dataset using the highest-quality data available from our data vendors. It includes detailed street and path geometry as well as an extensive set of attributes defining the characteristics of the streets, which are used in calculating impedances and restrictions. Your own data may have some differences in geometry - roads in slightly different places, certain roads missing, etc.  Thus, the optimal paths between places on the network may differ slightly.  You might also have some connectivity errors - places where the streets seem topologically connect but aren't actually logically connected in the network. Even if the geometry of the streets is identical, there is probably a difference in attributes between your data and the ArcGIS Online data.  The impedance calculations may be different, and ArcGIS Online might be using some restrictions that you are not. Finally, it should be noted that the ArcGIS Online data contains information about turn restrictions - specific turns that are not allowed or which incur a delay.  If you use the "Driving Distance" travel mode, these turn restrictions will be used, even though, for your use case, this probably doesn't make sense.  If your own network doesn't have any turn restrictions, it may allow you to build your pipes following the streets around a corner where vehicles are not allowed to turn, like an intersection where you cannot turn left.  But for pipes, I presume this doesn't matter.  Thus, your data may actually be more appropriate for this situation.  Note that there are ways you can adjust the travel modes even when using ArcGIS Online to turn off this restriction, so the issue is not insurmountable. As far as testing your network, it's pretty hard to interpret the results of a Location-Allocation problem. It might be better to do some Service Areas where you turn on the Lines output. This will help you look for holes in your network where things might be cut off.  You can also use Route to test some specific point-to-point routes to see if the results make sense. If you are concerned about topological connectivity in your network, you can try using this downloadable sample tool to identify topologically disconnected areas: https://www.arcgis.com/home/item.html?id=b2227f745a6c4e1c94dd57810729d2a9 ... View more

There are a few steps/levels that need to be considered, but it seems like everything is mostly set up correctly already.  Below is a sort of reverse-order list of things that need to be considered. I'm starting with the part you select when doing your analysis, and it's sort of backing up all the way through the network configuration. You would have to do the steps in the reverse order, but I'm explaining it this way because I think it's easier to understand conceptually. When you do your analysis, make sure to select your "automobil_distance" travel mode on the ribbon.  That ensures that you are using the travel mode you specifically configured for your purpose. You need to make sure the "automobil_distance" travel mode is configured the way you want it.  A travel mode is essentially just a bucket of other settings that model a particular mode of travel.  You want to use an impedance based on distance, so your Impedance property in the Costs section needs to be set to a cost attribute that models distance.  In your case, it's set to a cost attribute called "Length", which shows units of meters in your screenshot, so this seems good. You need to make sure that the "Length" cost attribute is correctly calculating the length of the streets.  To do that, switch to the Costs tab in the network dataset properties Travel Attributes page, find "Length" in the list of cost attributes, and examine its properties.  My guess is that this is the automatically-generated distance attribute you always get when you create a new network dataset, so it's probably just using the shape length of the roads to calculate the length.  If this is good enough for you, just leave it.  Otherwise, you might want to read more about cost attributes and evaluators so you can properly configure the way it calculates distance. ... View more

If I understand correctly, you want to find the optimal solution that minimizes the distance along the roads from the villages to the wastewater treatment plant potential sites.  So, for your network analysis problem, you need to optimize distance rather than travel time.   You need to set the Travel Mode option (it's on the Location-Allocation ribbon) to use a travel mode that optimizes distance.  Your post doesn't mention what network data source you're using, but if you're using ArcGIS Online or Streetmap Premium, there should be a "Driving Distance" travel mode that solves for distance instead of drive time.  If you are using your own network dataset, then it's up to you to construct a travel mode on that network dataset that uses an impedance attribute that calculates distance instead of time.  If you clarify what type of network you're using, I can provide further detail on that if necessary. ... View more