Latest Contributions by SaraRamos

I totally understand, and you have helped a lot! Is there an option to contact someone that could support further in this topic? or another platform that I could use? I know it is complex and therefore I am trying to find help because by myself can not manage yet.  Thank you very much! ... View more

Dear Melinda,  Thank you for your answer. I will try what you suggested.  In addition to this, while doing my analysis, I realised that a critical variable for me is the slope of the terrain, as ideally the sewerage network should be sloped so that the water flows by gravity. I should avoid as much as possible connecting points of demand with facilities that are against the slope. Therefore, I have the following question: is it possible to include the slope within the costs of travel mode so that the impedance is based on both length and slope? I tried to include a new cost called "slope" with units as "other"; but I am not clear how to configure this cost to calculate the slope between a demand point and the facility and assign the slope and consider it in the impedance. I have the DEM of the area and therefore I have the elevation, which can be assigned to the different demand points and facilities to consider the slope between them. Thank you very much again for your suggestions. Regards,  Sara Ramos   ... View more

Dear Melinda,  I have defined now the wastewater treatment plants (WWTP) required as well as which demand points are allocated to each of them (please see the image attached as an example). As long as I am using this tool to define a sewerage network, I can see the distance of each pipeline from each demand point to the WWTP in the atribute table of the lines of the Location Allocation or the Closest Facility layer. However I found the following issues or doubts:  1.Once the pipelines (which I assume are the roads in my ArcGIS project) of two or more demand points converge, the volume of water will increase, meaning that the diameter of the pipeline might increase as well, and I need to know the exact lenght of every section from the demand point to each of the convergences until reaching the WWTP. Is there a way to find these lenghts of the sections, additional to the total distance from the demand point to the WWTP? 2. Right now, in the atribute table of the lines I get the total lenght from each demand point to the WWTP. However, if I sum them up I will be counting more than once some of the lenghts because the routes from different demand points have common paths. Do you know how can I avoid these issue? This is required because at the end I need to make a cost analysis and this is based strongly on the length of the pipelines.  3. And the last question, just to confirm if I understand properly. The location allocation solver, type of problem Minimize Weighted Impedance (P-Median), chooses the best location considering both the length of the road as well as the weigh of each demand point? I ask because I need the WWTP to be located in the closest place to all the demand points but also considering the population of each town, because the higher the population, the bigger he amount of wastewater produced and therefore, I would not like to transport a huge amoun of water but to locate the WWTP as close as possible to big towns.    Thank you so much and I hope I explained myself properly.    Best regars,    Sara Ramos     ... View more

Dear Melinda Thank you for the link. It worked and I created a model for the location allocation analysis and service areas!. Now I have the best location of the facilities, but it´s location is shown with straight lines that point the facility that was chosen. Is there a way to show the actual route of each of the demand points towards the chosen facility? (instead of straight lines). In the attached image, I have the best location for different facilties, and I need to show the actual path (on the roads network) from the demand points allocated to each facility, but can not find the way to show it in this way. Can you please guide me? Thank you very much once again.  Regards,  Sara Ramos   ... View more

Hello dear Melinda,  All this time I have been doing the process manually, so far I have chosen service areas for the potential facilities and after that, within the service areas of each facility I have used the Location-Allocation tool to choose the final best location for a WWTP. But as long as I am trying different service areas and alternatives this is an iterative process that is taking a lot of time, so what you mentioned about creating a model with Model Builder sounds promising.  However, I have been watching tutorials about Model Builder but I do not know how to use it with these Network Analysis tools. Do you maybe know about a tutorial that I can go through to learn how to do this? In summary, I would need the model to choose n numbers of cuttofs to create service areas, and for each of them to run the location allocation. It is abour creating different scenarios to at the end choose the best.  I hope I was clear enough. Thank you so much for your contributions,  Sara Ramos       ... View more

Dear Melinda,  I have divided my study area in 22 sub-areas and then I have run the "location allocation" tool sevetal times to create different scenarios in each sub area changing the number of Waste Water Treatment Plants as well as the cutoff, in order to compare and choose the most cost-effective option.  However this is quite time consuming, as for each configuration (number of WWTP and cutoff) I need to create a new layer for the location alocation analysis.  So, I have a question, is it a way that I can do this in a faster way? instead of repeating the creation of the location alocation layer, choosing the facilities, demands etc for each of my configurations? Thank you very much for your attention! Regards,  Sara Ramos       ... View more

Dear Melinda,  You are right, I realised that something might be wrong with my network because when I ran the "service area" analysis the result does not include all the streets in my network, just some of them (as you can see in the image attached).  On the other hand, I downloaded the phyton package that you suggested to identify topologically disconnected areas, and read about environemnts and the instaltion of packages. However I am quite new in this topic and have not been able to find out how to install a phyton package that is not listed in the "add packages" within the "Phyton package manager" in Arcgis Pro, but that I downloaded. Could you please inform to me where I can get instructions to this instalation?  In case it is important, my ArcGIS version is Arcgis Pro 2.5.2 Again, thank you very much! Sara Ramos ... View more

Dear Melinda,  I used ArcGIS online to run the loccation allocation analysis, using exactly the same information (about facilities and demands) that I have been using with muy own network dataset (the one that I created). However, the results in ArcGIS online are different than the ones that I get using my dataset and ArcGIS Pro.  Therefore, I am wondering why does this happen. It might be that my dataset has errors? Is there a way to kind of validate my network dataset? I created my dataset basically with the polylines that I delineated of all the roads in my study area. No more information was included.  Thank you very much again and I look forward to help on this respect.  Regards,  Sara Ramos ... View more

Dear Melinda,  Thank you very much for the information. Yes, what you mentioned was considered when I made network dataset, and I am running the tool for location allocation with different configurations to analyse the results.  I might write again in the near future if a new issue arises.  Thanks a lot again!! Sara Ramos ... View more

Dear Melinda,  You completely understood what I intend to do :). I made my own netwok dataset from a shapefle of the streets of the area of interest (yellow lines in the image that I attached in the previous post). When I adjusted the properties of that Network dataset, I chose as "Type": Driving, and as "Impedance": Length (see image attached). However I am not sure if my own network database is correctly set-up.  In this case, that is all what should be done for this case? I mean, the impedance attribute should be based on length instead of time? Thank you very much for your answer and attention.   Regards,    Sara Ramos ... View more

Dear Joe, thanks a lot for your reply. I have read but I actually do not have clear what is the purpose of the queries, could you please let me know about it a bit more? I tried some query but it did not work. Thank you so much!! Sara Ramos El mié., 24 jun. 2020 a las 16:20, Joe Borgione (<[email protected]>) escribió: GeoNet, The Esri Community | GIS and Geospatial Professional Community <https://community.esri.com/?et=watches.email.thread> Re: Why when I divide or split a polygon one of the resulting parts disappears reply from Joe Borgione <https://community.esri.com/people/jborgion?et=watches.email.thread> in *ArcGIS Urban* - View the full discussion <https://community.esri.com/message/936864-re-why-when-i-divide-or-split-a-polygon-one-of-the-resulting-parts-disappears?commentID=936864&et=watches.email.thread#comment-936864> ... View more

Dear Scott, I included the "all other values as a class", but nothing changed. Also, I modified the split policy in the Domain, as you can see in the following screenshot, but the problem remains. And I have followed recommendations given in this discussion but still can not solve the issue Do you have any other suggestions? Thank you so much for your help! Best regards, Sara El jue., 25 jun. 2020 a las 18:33, Scott Harris (<[email protected]>) escribió: GeoNet, The Esri Community | GIS and Geospatial Professional Community <https://community.esri.com/?et=watches.email.thread> Re: Why when I divide or split a polygon one of the resulting parts disappears reply from Scott Harris <https://community.esri.com/people/SHarris-esristaff?et=watches.email.thread> in ArcGIS Pro - View the full discussion <https://community.esri.com/message/937248-re-why-when-i-divide-or-split-a-polygon-one-of-the-resulting-parts-disappears?commentID=937248&et=watches.email.thread#comment-937248> ... View more

Dear Larry, thank you so much for the help. I tried to select the polygon that I can not see anymore after the split, but it is not there something to select. On the other hand,. here there are two screenshots of before and after the split. after I split it seems that a second feature is created, with the same ID. Before: After I split: Can you notice that although the left part of the polygon is selected, there is not a polygon itself? therefore, once I clear the selection the polygon on the left is just gone.I tried also to include "all other values" in the symbology but it did not work. Thanks a lot and I hope we can find out what is happening. Best regards, Sara El jue., 25 jun. 2020 a las 15:00, Larry Masters (<[email protected]>) escribió: GeoNet, The Esri Community | GIS and Geospatial Professional Community <https://community.esri.com/?et=watches.email.thread> Re: Why when I divide or split a polygon one of the resulting parts disappears reply from Larry Masters <https://community.esri.com/people/Mainmast?et=watches.email.thread> in *ArcGIS Pro* - View the full discussion <https://community.esri.com/message/937241-re-why-when-i-divide-or-split-a-polygon-one-of-the-resulting-parts-disappears?commentID=937241&et=watches.email.thread#comment-937241> ... View more