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Thanks again Anna! However, still 2 questions. First question: when I want to use the Overpelt Fabriek site as the start and end depot, is it enough to just load it as a location for the Depots? You can see in attachment the example for route 1 for which I loaded 378 locations as the orders and the Overpelt Fabriek site as the Depot. Second question: How can I add the number of orders in the area as the MaxOrderCount for each route? Many thanks again! Problem is almost solved 🙂 Thomas Forgot attachment. It should now be included.
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04-03-2012
06:02 AM
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Hi Thomas, Your problem is simpler than I thought. For each area, you only need one route. You can use Overpelt Fabriek site as the start and end depot, and use the number of orders in the area as the MaxOrderCount for the route. Since the all orders in an area will be assigned to one route, solving the problem will take a while. Thanks. anna Thanks again Anna! However, still 2 questions. First question: when I want to use the Overpelt Fabriek site as the start and end depot, is it enough to just load it as a location for the Depots? You can see in attachment the example for route 1 for which I loaded 378 locations as the orders and the Overpelt Fabriek site as the Depot. Second question: How can I add the number of orders in the area as the MaxOrderCount for each route? Many thanks again! Problem is almost solved 🙂 Thomas
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04-03-2012
03:52 AM
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Ok, I've gone throught it. I support your idea of creating a VRP for each subarea. However, I should first give some further explanation concerning the background of my model. The dots of the three subareas represent collecting locations of biomass. The aim is now that a transport van with a mobile pyrolysis reactor on it, visits each collection location. The mobile pyrolysis reactor converts the biomass to oil, which is then 'tanked' into another van that transports the oil to the Overpelt Fabriek site. So, the van with the mobile pyrolysis reactor on it, does not return to the Overpelt Fabriek site but just visits each parcel after another, while the oil is brought to the Overpelt Site by the other van. So, for my analysis I would just like to get the distance of the van with the mobile pyrolysis reactor on it without returning each day to the Overpelt Fabriek site. So the transport distance per subarea consists of the distance from the Overpelt Fabriek site to the first collection location plus the distance that is travelled to visit all other collection locations and then finally the distance to return to the Overpelt Fabriek site. Is it possible to explain how I should deal with this situation in ArcGIS ? I hope my explanation is clear. Many thanks in advance, and sorry for keeping asking questions !
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04-02-2012
01:55 AM
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Thanks a lot, I will deal with it this afternoon and keep you updates. Many thanks! Thomas Voets
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04-01-2012
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Thanks a lot, But still not working... Here are my data. The zipfile contains 5 different layers: 'Gebied A', 'Gebied B', 'Gebied C': the point layers with the locations where the biomass is collected. 'Study Area': shapefile layer of the study area 'Overpelt Fabriek': the point layer which represents the location where the biomass is centrally processed. This is also the location where the transport vehicle start to collect the biomass. 'Wegsegmenten': this means 'road segments'. This is the road network in the study area. The last column 'lengte' represents the 'length' of the different road segments. Hope these data are the data you are looking for? Many thanks in advance! Thomas Voets
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03-30-2012
05:46 AM
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Thanks a lot Anna, I've gone trough all this but I still get the same remark: " network has no cost attributes". However I added the 'meter' cost attribute I created it like this: I added the attribute 'Meters' with usage type 'cost', unites 'meters' and data type 'double'. Then I createdn evaluator. It consists of 2 rows with 2 different sources: Source 1: 'Road Segments', direction 'from-to', element 'edge', type 'field', value 'distance' (which refers to the column of the attribute table of the road segments in which the distance in meters is given) Source 2: 'Road sgements', direction 'to-from', element 'edge', type 'field', value 'distance' (which refers to the column of the attribute table of the road segments in which the distance in meters is given) Do you have any idea why it is still not working despite the fact I added this cost attribute? Should I add more of them for my problem in which I just want to visits different locations in a sequence that minimizes total transport distance? Thanks again! Thomas
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03-29-2012
01:35 AM
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Here a short update of the status of my problem: I have very little experience with network analyst. So, when I was opening the 'Make Vehicle Routing Problem Layer', I had to add my input analysis network. Therefore, I first created a network dataset. When I wanted to load my network dataset as the input analysis network for the Vehicle Routing Problem Layer I get following message: "Network has no cost attributes." This is quite strange because I added a cost attribute (see figures attached in this post). Can somebody help me? Which (cost) attributes should I further add to my network dataset, based on the description of my problem mentioned above? Thanks in advance! Thomas
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03-28-2012
04:29 AM
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Thanks a lot! I will go through the documents and keep you updated if I can solve my problem with it. Kind Regards, Thomas Voets
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03-21-2012
02:18 AM
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Hello, I will try to explain my problem by means of a the figurethat I attached in this post. In the figure you can see the study area. Each small dot represents a biomass collection location. As you can see, the dots are divided in three different colors in order to create 3 subareas which each are visited by a truck to collect the biomass. The blue lines represents the existing road network in the study area. The large blue dot is the central biomass plant location, which is currently not relevant for the explanation of the problem. For each of the 3 subareas, the biomass should be collected by a truck at each dot. This should be done in a way the distance to be traveled is as low as possible. Therefore, I would like to develop an algorithm which satisfies 2 important conditions: 1) After the first dot is visited, the next dot to be visited is the dot that is the closest to the first dot. The third dot, is the dot that is the clost to the second dot, and so on. In general, one could say that the next dot is the dot closest to the current dot, except dots that are already visited. 2) The sequence of the dots that are visited should afterwards be consultable for further analysis, just like the total distance and the distance that is traveled between each dot. If possible, the distance over the existing road network should be calculated. However, since not all collection points are connected to a road network, Euclidian distance with also be satisfying. I hope my explanation is clear ! Many thanks in advance... Thomas Voets
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03-20-2012
05:28 AM
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Hi, I am currently facing a biomass storage location optimization problem. The aim is to determine the optimal location of a biomass storage site, for which total transport distance to be traveled over the existing road network is minimized. To be more specific: I currently have 2 different layers: - First: a point layer which can be consists of more than 1000 departure location for biomass transport. From each departure location, the biomass is transported to the storage site of which the location is to be determined. - Second: a layer which shows the existing road network in the study area The aim is now to determine the location in the study area for which the total distance from all the departure points over the existing road network is minimized. This location is then considered as the optimal biomass storage site. Another assumption is that the biomass storage site is located next to/on a road and not in the middle of example an agricultural parcel. Could somebody please help me with this problem? I hope my explanation is clear... Many thanks in advance !
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03-07-2012
12:14 AM
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Hi, I am currently facing a biomass storage location optimization problem. The aim is to determine the optimal location of a biomass storage site, for which total transport distance to be traveled over the existing road network is minimized. To be more specific: I currently have 2 different layers: - First: a point layer which can be consists of more than 1000 departure location for biomass transport. From each departure location, the biomass is transported to the storage site of which the location is to be determined. - Second: a layer which shows the existing road network in the study area The aim is now to determine the location in the study area for which the total distance from all the departure points over the existing road network is minimized. This location is then considered as the optimal biomass storage site. Another assumption is that the biomass storage site is located next to/on a road and not in the middle of example an agricultural parcel. Could somebody please help me with this problem? I hope my explanation is clear... Many thanks in advance !
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03-07-2012
12:13 AM
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I don't want to be impolite, but is there anybody who could help me ? Many thanks in advance...
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12-19-2011
01:54 AM
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I am currently developing a biomass transport model in ArcGIS. I calculated the distance over the existing road network that must be traveled to transport all biomass from the agricultural fields to a potential biomass plant location. The transport is performed by means of a tractor-trailer with a load capacity of 12 ton. It is assumed that from the centroid of each of the 1960 agricultural parcels, at least 1 trip to the potential plant location departs. The amount of biomass that is available is different for each parcel. For some locations, this amount is smaller than the load capacity of 12 ton. This is why the average load factor of the tractor trailer is only 71%. To increase this percentage, I would like to develop an ArcGIS algorithm that takes together parcels that have an available amount of biomass that is lower than 12 ton. This way, the number of parcels and thus also the number of departure points is decreased. There are 2 conditions in combining parcels: - The parcels should share at least a boundary. This way, the centroid of the 2 parcels that are taken together can be seen as the new departure point, instead of one departure point in each parcel. It is impossible to combine parcels that do not share a boundary. - The parcels should be combined, up to a biomass amount of 12 ton. However, combining for example 3 adjacent parcels that have an available biomass amount of around 12/24/36,... ton is also a possibility. The aim is to increase the load factor as much as possible. Combing a parcel with a biomass amount of 5 ton and another parcel of 6 ton results in a new parcel with a biomass amount of 11 ton, which still increases the average load factor. (11/12) instead of (11/24) Is there anybody who has an idea which way I can best combine the parcels, taking into account the fact that they should at least share one boundary? Somebody gave me the tip that the aggregate tool of Spatial Analyst should be used, but for me it is quite unclear how I should deal with this. Many thanks in advance.
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12-13-2011
12:09 AM
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You should use the OD Cost Matrix solver and not the route solver. You can load all your 1960 departure locations as Origins and your 1 arrival location as the Destination and Solve. You will get an output line feature class with 1960 records. Do note that it will place a straight line between the locations but the computed distance will be over the network. If you also want to get the geometry of the actual path travelled then use the Closest Facility solver. Read more about OD Cost Matrix here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/OD_cost_matrix_analysis/00470000004r000000/ Jay Sandhu This way it works. Many thanks!
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10-17-2011
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