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Hi, Forum! Im running into some issues when trying to display Route events (Points with length data) within a river catchment. Here`s the point of departure and the way I tried it: I got 51 fish sampling points evenly distributed over the Austrian river network. For each of these points I do have data on the length of the fished stretch (between 200 and 6500 meters for each point) and whether the sampling was conducted upstream or downstream of a point. In order to get a polyline imprint ffor each of those 51 sampling points, I was trying the "locate features along routes"-tool to get their location at the river network (units in meter). Curiously, after providing the tool with the correct Route identifiers, the measured distance (meas field output in the attribute table) for each point is way too short (always somewhat between 0 and 600 m) although a river route may be greater than 1500 meters in length. Still, although those numbers are to small, their location seems to follow a correct ratio (e.g. if i got 2 fish points in a row, one would show me 150 m and the upstream one 180m) However, next I was using the meas data and the fished length data on the "display route events" option. For upstream lengths, i calculated "meas + fished length" and vice versa for the downstream fished lengths ("meas - fished length"). The result is a polyline shapefile where every single length is overestimated at large scale (sometimes more, sometimes less). I hope you can help me with this, thanks in advance Wolf
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05-20-2013
11:03 PM
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@Richard Fairhurst: That was an astonishing answer and brilliant guide support as well, many thanks for your efforts. It is definitely working and I am very surprised by this elegant solution. Saved me a lot of further time and brainracking. Respect! :cool:
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05-13-2013
02:27 PM
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Ok guys, i just see i got some very comprehensive answers, thanks for that. But i got to confess I was only telling you the half of the truth. So may I can ask you how you would solve this task: [ATTACH=CONFIG]0[/ATTACH] Actually it is not about creating a whole drainage network as one, but to set up so-called "habitat patches" for fish. The red line is a main river stretch and the blue line represents a part from a tributary (as mentioned in my first thread, tributaries and the main segment are 2 different shpfiles. The grey points are impassable barriers for fish, so shortly speaking, every habitat is representing an area that delineates a freely moveable river habitat which will end at any impassable barrier. OK so now how would you create a single habitat patch (uniform ID) consisting of tributary (blue) and main stretch(red) out of the two different shapefiles. Please be so kind to describe it in a manner so that an arcgis newcomer such as me will be able to reproduce it. Many thanks for your answers so far. I can see whether I am able to solve this problem with your information already provided. I will let you know if it works. Thanks, Wolf
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05-13-2013
10:04 AM
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Hi, Im struggling a lot with the following issue: I got one shapefile which shows main rivers (those rivers again are segmented into several parts by an ID); as well as one shapefile with the corresponding tributaries to those main rivers. My task is to merge the tributaries to the main rivers in such way that the endproduct will be a total river network. The idea then is to get a combined polyline for every main river segment and the tributaries belonging to it, i.e. the number of main river segments is just the same as before, it is only that now each main river segment should be extended by tributaries. I did already some attempts on spatial joining the tributaries to the main rivers (join many to one), which works, but I the layout view is still lacking of tributaries. Other attempts like "union" did not work either, because they require polygon shapefiles. The dissolve tool again needs to be fed with only one shapefile, which is not the case here. And finally, merging is not leading to the desired goal, because it constructs two distinct data sets in the attribute table rather than assigning the tributaries to the segments. Any suggestions or solutions for this? I hope anyone out there in the Esri forum knows how to resolve my tricky problem;) Many thanks in advance, Greetings, Wolfgang O (Austria)
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05-12-2013
01:11 PM
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Hy guys, How can I deal with that issue: I got 20 sampling stations (raster points) well distributed over a stream network and I would like to arrange sub-watersheds around each of those points to finally get a large one comprised of all those sub-catchments. What I already tried: transform my raster sampling data into batch points and execute the subcatchment delineation Actually, this worked BUT the problem is that instead of my 20 originate points the batch point conversion created somelike 80 subpoints with 6 points arranged around my "real" points. That produces confusion when I actually want to carry out zonal statistics on those 20 points (now watersheds) and I got more than 70 subwatersheds now Anyone an Idea how to derive exactly those 20 watersheds that I would require Thanks in advance, Wolf
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04-09-2013
11:36 PM
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