Timeline for Flow direction generated for river is incorrect
Current License: CC BY-SA 3.0
23 events
| when toggle format | what | by | license | comment | |
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| Feb 16, 2018 at 8:51 | history | edited | gisnside |
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| Apr 1, 2015 at 21:34 | answer | added | Jordan Walker | timeline score: 1 | |
| Aug 11, 2014 at 16:22 | history | tweeted | twitter.com/#!/StackGIS/status/498866970843168768 | ||
| Jul 28, 2014 at 9:23 | comment | added | Hornbydd | This was my thinking. Looking at the main stem its gray at the coast and still gray at the u/s "end". I was thinking that there is no height difference and it has arbitrarily drained in the u/s direction? | |
| Jul 28, 2014 at 7:39 | comment | added | vklopt | hey. . @ChrisW If I have to convert my raster (output stream network) into vector, how about the part it was disconnected? I mean of the flow break illustrated in the screenshot above (floe accumulation --> flow break) | |
| Jul 28, 2014 at 7:32 | comment | added | vklopt | @MichaelMiles-Stimson I'll try it as it seems best fit to solve my problem. . Thank you. . | |
| Jul 28, 2014 at 5:36 | comment | added | vklopt | Hi @Hornbydd . .the screenshot of the raster above is the whole dataset I am working of. . the area has been clipped so as to focus on that certain area. . does it mean that by clipping a certain area would probably affect the flow accumulation of the grid? | |
| Jul 27, 2014 at 21:55 | comment | added | Michael Stimson | Yes @ChrisW, that was where I heard it before. It looks like it's a very flat area but as for the actual flow of the river you can't tell just from a flow direction. Use the link that Chris provided to create drainage downhill and then FelixIPs' suggestion using the flow directed drainage to hydrologically enforce the DEM, that or fill sinks on the DEM to flatten the areas where it shouldn't be backflowing. | |
| Jul 25, 2014 at 21:42 | comment | added | FelixIP | What is happening here is very common thing with out of the box DEMs. It is not flow enforced, thus the road in the middle on the flat part of river creates 'ridge' where it shoulg not be. Quick and dirty solution is to convert grid to points, create river digitised in correct direction, use Topo to grid with points and stream. | |
| Jul 25, 2014 at 19:08 | comment | added | Chris W | @MichaelMiles-Stimson I think you may be referring to Stream to Feature as discussed at this question. | |
| Jul 25, 2014 at 10:18 | comment | added | Hornbydd | The screenshot of your raster, are you showing us a clipped back example for convenience or is it the whole dataset we are seeing so your upstream end has been arbitrarily been chopped off (the bottom of the picture as we look at it)? | |
| Jul 25, 2014 at 9:35 | history | edited | Hornbydd | CC BY-SA 3.0 |
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| Jul 25, 2014 at 6:27 | comment | added | vklopt | i have added additional inputs actually to give emphasis to the broken flow. .i dont know why does the direction flows opposite of the actual flow. | |
| Jul 25, 2014 at 6:20 | history | edited | vklopt | CC BY-SA 3.0 |
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| Jul 25, 2014 at 6:10 | comment | added | Tomek | Stream Link or something similar. | |
| Jul 25, 2014 at 6:08 | history | edited | vklopt | CC BY-SA 3.0 |
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| Jul 25, 2014 at 6:06 | comment | added | Michael Stimson | No @PolyGeo, that's not it. That tool converts vector to raster, the one I'm referring to is the other way around: the accumulation raster to watercourse lines with flow direction. Do you know what that one is? | |
| Jul 25, 2014 at 6:03 | comment | added | Mike T | The above results look normal, but the actual flow direction will make more sense when you perform a flow accumulation from the flow direction. | |
| Jul 25, 2014 at 6:01 | history | edited | PolyGeo♦ |
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| Jul 25, 2014 at 5:59 | comment | added | vklopt | i'll try again to edit my question to display the actual flow direction. | |
| Jul 25, 2014 at 5:57 | history | edited | vklopt | CC BY-SA 3.0 |
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| Jul 25, 2014 at 5:57 | comment | added | Michael Stimson | it looks like ArcGis by the shading. Flow direction is the direction for each cell where the water will flow. From this you create a flow accumulation which will concentrate the values at the creeks/rivers then using a threshold value extract the high values (extract by attributes - spatial analyst) and raster to polyline in the basic form but there is no guarantee that the rivers will flow downhill. I believe there are some hydro tools for arc that will create the rivers that will flow downhill but don't know what it's called. | |
| Jul 25, 2014 at 5:46 | history | asked | vklopt | CC BY-SA 3.0 |