4
votes
Accepted
Calculating Flooded area / Inundation in ArcGIS for Desktop?
Your workflow should get you what you need.
I'd recommend to use Con for the first two steps (then you can aggregate them into only one step).
I don't know of any existing tool that does these ...
- 4,928
4
votes
Accepted
ArcGIS ModelBuilder looping wrong tools?
When you put an iterator in Model Builder, it is supposed to execute the entire model with every iteration. What I think you are looking for instead is to either write this as a python script, so you ...
- 3,853
3
votes
Fill a sink with a known volume of water to obtain actual depth and extent of a pond
Here is a link to a Python tool to loop the surface volume tool in ArcGIS. You will need a 3D Analyst license to use this tool. You will need a single raster file for each of your sinks but it looks ...
- 9,207
3
votes
ERROR 000840: The value is not a Raster Layer
This is a bit wonky:
ws = env.workspace = r"C:\Users\fractal\Desktop\python_teste\projecaoMiriab2.tif"
This code assigns the workspace, and the variable ws, to the folder housing your tif. So this ...
- 13.8k
3
votes
Accepted
Distance to a polygon along the stream flow path
The Flow Distance tool will calculate the distance from each cell to the closest flow path. I believe you could change the polygons to polylines in the shape of the polygon and then use those lines as ...
- 156
3
votes
Limiting flow direction to D4 instead of using D8 in ArcMap?
Let me know if this is what you expecting to see:
I'll post workflow.
- 22.5k
2
votes
How to plan preservation of wetland using a DEM and ArcMap?
Yes I believe HSR's approach is a good start. This newly published paper does pretty much as you desire by identifying concentrated flow paths.
It is in JAWRA, the Journal of the American Water ...
2
votes
How to Call ArcHydro Tools in Stand Alone Python Script
I've discovered there is an ArcHydro Tools Python toolbox which is installed in the ArcHydro Set-up. C:\Program Files (x86)\ArcGIS\Desktop10.2\ArcToolbox\Toolboxes
This covers most ArcHydro tools ...
- 105
2
votes
Flow Accumulation Stream Buffer
Input:
Workflow:
#convert flow accumulation to streams raster
arcpy.gp.RasterCalculator_sa("""Con("facc" >= 100000,1)""", "D:/Scratch/stream_r")
#derive streams as polylines
arcpy.gp....
- 22.5k
2
votes
Accepted
How is "Burn Stream Slope" in ArcHydro working?
The "correct" DEM for the elevations is the initial one only. The Burn process modifies the DEM so that the resulting flow direction matches observed flows. You should still use the original dem to ...
- 86
2
votes
Accepted
Counting upstream features based on flow direction line segments?
Use your stream lines and pour points as inputs into a geometric network. Then iterate through your pour points and use the trace upstream network to select all upstream lines from that point. ...
- 9,207
1
vote
Fill a sink with a known volume of water to obtain actual depth and extent of a pond
Reclass you elevation model using small step, e.g.
arcpy.gp.RasterCalculator_sa('Int("DEM" / 0.5)', "C:/SCRATCH/Z_CLASS")
Assign depressions good unique name, that can be used as field header in ...
- 22.5k
1
vote
Estimate total stream length, frequency and order in ArcMap
ArcGIS Desktop has an easy to use tool:
http://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analyst-toolbox/stream-order.htm
You'll need a stream and flow direction raster before you can run this ...
- 76
1
vote
How long should it take to generate a Hydro Network?
Looking at the help file I see the Hydro Network Generation tool is creating a geometric network. It should not be taking hours for 53,000 lines, minutes may be, but not hours.
So this strongly ...
- 42.6k
1
vote
DEM reconditioning?
If I am understanding you correctly, the blue lines on your map (your 'actual' lines) are lines that represent physical, ground-truthed drainage on landscape. The red lines represent drainage lines ...
- 742
1
vote
How to create "AGREE Stream" for DEM Reconditioning in Arc Hydro tool?
In my experience, the AGREE Stream can be any line layer that the tool will convert into raster and burn into your DEM at the width and depth that you specify in the tool dialogue.
So you can create ...
- 11
1
vote
Adjoint catchments missing in Arc Hydro?
After a few days of trial and error, and help from @Jon, I somehow got it fixed.
I am guessing my (stupid) mistake was that I manually had split an upstream-catchment, which was too big. This ...
- 343
1
vote
Improve Catchment polygon processing result accuracy?
You need to derive the catchment from a higher resolution DEM raster and preserve the same resolution/cell size. It should be the same resolution that the stream features are based on, that way it can ...
- 345
1
vote
Creating slope grid using Arc Hydro tools says dataset does not have spatial reference?
This is a very common message in coordinate system Q&As here - see https://gis.stackexchange.com/search?tab=relevance&q=dataset%20does%20not%20have%20spatial%20reference
I think it is ...
- 64.9k
1
vote
Which algorithm is used for fill sinks in arc hydro tools?
There is no difference between fill algorithm in arcgis hydrology tool and archydro.they are same. You can read about how arcgis fill tool calculate fill here.
The algorithm developed by Jenson and ...
- 5,825
1
vote
Accepted
Dissolve Lines without Dissolving Convergent Lines?
I have come up with an approach:
Create a point layer with points for each vertex in the stream network layer
Buffer each vertex a (small) desired amount (I arbitrarily chose 10 metres)
Run ...
- 103
1
vote
Delimit Hydrographic Basin, based on a single river
I have not tried for a single river, but for a single point which belongs to the river for example.
You can delineate the draining area to a point within the river using the DEM. I do this using the ...
- 309
1
vote
Accepted
Locating flooded area by creating buffer with elevation around points using ArcGIS Desktop?
It's possible using IDW in 3d Analyst or Spatial Analyst. This can create a Raster with elevation by interpolating between the points. It's important to make sure the buffer is large enough and ...
- 467
1
vote
How to Call ArcHydro Tools in Stand Alone Python Script
You can import Archydro like any other module
import ArcHydroTools
Then you can access functions like
ArcHydroTools.CatchmentPolyProcessing(...)
- 4,928
1
vote
Determining Thalweg line of river without bathymetry?
You don't really give a scale at which you are working at? The entire Amazon or a section of a river as suggested by the image above? Without Bathemetry data or cross sections I would imagine ...
- 42.6k
1
vote
"ERROR 010214: Unable to read STA of..." while running Arc Hydro Geoprocessing Tools
Right Click the Esri Grid (DEM) data in ArcCatalog-->Calculate Statistics
If it doesn't solve, then export your DEM to another raster format (e.g. Tif) and recalculate the statistics and use ArcHydro....
- 8,753
1
vote
Assigning point IDs to respective start and end attributes of polyline using Arc Hydro with ArcMap
I was inspired by @FelixIP, but I wanted to write a solution without joins or the creation of extra files, since my network is quite large with 400K+ pipes and 500K+ nodes.
The geometric network build ...
- 878
1
vote
What is Login to Esri FTP site for Arc Hydro Tools?
You can also find the current (and older) Arc Hydro versions, documentation and tutorials on Esri's download server: http://downloads.esri.com/archydro/archydro/
No usernames, passwords and FTP ...
- 621
1
vote
Watershed delineation taking into account lake/reservoir
This is a very interesting question.
In general, there are two different types of lakes, endorheic and endorheic. So I am not sure how Arc Hydro handles them.
There is a nice paper on this topic:
...
- 300
1
vote
Error running Arc Hydro tools function in ArcMap?
Well I had that problem with Hec-geoHMS while trying to create the basin model file.
To fix this I implemented the steps mentioned above and I did not change the output destinations of any files on ...
- 11
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