Latest Contributions by RamB

May be try working with the linear referencing tool and then using its calibration tool to update when measurements change. ... View more

This is possible in two ways: Manual and a 3d analysis (if i understand your question correctly) !! Do you have many possible OD movements ? Or do you have just a few ? There is a manual way to do it if it is few, but if it is many, I am not sure how ( i havent tried it, but should be possible with programming). With no programming, unfortunately it is a manual process. I also work on freight movements, may I ask what is the final objective of the study ? ... View more

It is very tempting to use such formulas. But if your speed values are field measured values, then it is already a function of slope, distance and impedance (whatever that might be), so you would just be overdoing it. if your speed is a speed limit regulation value, then you can make a linear combination to keep it simple. For travel time, 1. upslope will have a reduce the speed and hence more travel time (so positive coefficient) 2. high speed will reduce travel time (so negative coefficient) 3. long distance will increase travel time (so positive coefficient) 4. more impedance will increase travel time (so positive coefficient) Now you can make linear combinations as it might suit your requirements, you can add weights to them etc. ... View more

I do not think this is a question for network analyst. This is for spatial analyst on raster analysis. The results will therefore depend on the resolution of the raster. after raster analysis, you can bring it back to network analyst. ... View more

may be just make all your origins as incidents and destination as the only facility and do a closest facility ? 😛 or why not do a OD matrix ? ... View more

Interesting 🙂 The criteria is too rigid to ask baboons to follow 🙂 i am assuming, you generated the lines by connecting GPS waypoints of the same date. there are a couple of ways to do this. The difficult criteria to achieve is a minimum of 100m length .You can get exactly what you are looking for if you have programming support. To start with the simplest solution, first, break the line feature at each waypoint, ie., line is now segments between two waypoints on a line. Select the layer and add a field named "date", as text field and give it a value 23 which means 23rd of a month (for all lines ofcourse). Now "save as" this file with a different name. Add the two layers to the map window. Now Select one of the layers to do a spatial join with the closest option with a search radius of 50m. Use one to one and define the merge rule as "join" on field "date" with comma delimiter. This operation will help you to avoid duplicate counts. After your finish this spatial join operation, the resulting layer will have a "join count" indicating the number of line features found within 50m, but this count can have lot of duplication, so use the merged "date" values to correct this error (may be in excel). this whole operation will give you the paths that were travelled 2 times or 4 times, but not if they overlap 100m. Though not entirely correct, but you can roughly say the overlap distance is same as the length of the segment under observation. To do the overlap 100m criteria, you will need to create buffers and iterate almost the same procedure as above for each buffer region with a programming code. But it is possible to answer your original question. For baboons as in question, I might use different criteria, for example, paths proximity to food source, shade, water, divide the whole area into grid and calculate the time spent in each grid cell and possibly identify sources of long durations etc, Nevertheless, if you have programming support, your task will be easier, I am not sure if a solution is possible with network analyst. May be the thoughts above can bring a solution from others. let me know if you are not able to work it out. Cheers ... View more

Hi, Yes this is very easy, there is also a tutorial with installation and also in the help file. Look here http://www.esri.com/flashmedia/na_drivedirect.swf If you dont find the files, let me know. I will explain further. Sriram hello, i am new to arcgis and am trying to calculate the driving distances between 2 sets of xy coordinates. i have a data set with 5 columns--id, x-origin, y-origin, x-destination, y-destination--and would like to create a new showing the driving distance between the respective xy coordinates. i was told that this might be possible using network analyst but have never worked with that tool. any help would be appreciated! Daniel ... View more

Jay is right. I would suggest the same. ... View more

Hi, This is very interesting. You can look at other criteria: 1. Look if you can have your road network in some kind of road classification based on class (freeway, arterial, major road, minor road), you can use them as restrictions. This is the most easiest way to avoid such turns. 2. Use road width if available as a deterent. 3. Use distance between intersections as a deterent, small values mean local roads, local roads mean sharp turns. For a heavy vehicle to change direction from road x1 from speed y1 to road x2 with speed y2, it needs some decelerating distance, if your distance between these intersections is lower than this value, possibly a heavy vehicle cannot make this turn. 4. Use number of lanes as deterent, usually heavy vehciles do not enter streets with less than 2 lanes. 5. Look for speed limits in the network. Heavy vehicles usually have slow speeds and sharp turns in the first 5% of their trip and the last 5% of their trips, this can be used in combination with you global turn angles, i.e., if you the distance so far is less than 5% of total trip distance and angle is sharp, allow it; sililarly on the other end, any sharp turn in between should be seen with caution. 6. When dealing with long distance trips be it cars or trucks, give more weight to speed limits than distance, this will automatically take vehicles to higher order roads as soon as possible, thereby avoiding sharp turns in local roads. many of the above can be used in combination to avoid the problem you are having. The are many such common observations in your local area will help you formulate a better model in ArcGIS. Srirama ... View more

Hi, This is very easy. Do you mean you want to add only the final and initial point of the trip and use shortest path analysis for finding the trip routes ? This very table can be used, provided you use Node IDs (or coordinates). Do you already have a solution? Else I can tell you how. Sriram Botswana/ Rwanda ... View more