12 votes

Assigning point IDs to respective start and end attributes of polyline using Arc Hydro with ArcMap

Sometimes it is better not to use out of the box solution. This is why I suggest: Populate X and Y fields in node layer, convert them to integers, say cm. Create string field and populate it by ...
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  • 21.4k
7 votes

Stream Segmentation in ArcGIS

Algorithms for performing stream network analysis all work in a similar way. These tools will use the D8 flow direction (Fdr) grid to navigate through a defined raster stream network (Str) using the ...
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  • 10.8k
5 votes

Create stream network using ArcGIS

I wrote a detailed answer to another recent question regarding extraction of streams from DEMs here. However, the gist of it is that when you extract a stream from a flow accumulation raster (upslope ...
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  • 10.8k
4 votes

How to derive stream order from vector network

I would like to defend RivEX and what its capable of. I have to admit I have a vested interest as I'm the developer behind it. Some very clever people (not me!) developed an algorithm that could ...
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  • 38.5k
4 votes

Arc Hydro giving Error HRESLT E_FAIL has been returned from call to Component?

It appears that this is a fairly common error encountered when ArcHydro is run with data between the network and the local C: drive. See this site for further details: https://geonet.esri.com/thread/...
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  • 10.8k
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 ...
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  • 4,892
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 ...
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  • 3,778
3 votes

Creating Stream Order with using thresholding

To create the raster stream network you first threshold a flow accumulation raster, likely using the Raster Calculator or the Con tool. You're right that this will create a Boolean streams map of 1's ...
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  • 10.8k
3 votes

What is Login to Esri FTP site for Arc Hydro Tools?

The content was migrated to GeoNet over the fourth of July weekend. A quick Google search turned up a relevant thread (read the top and bottom, because the password has changed since the original post)...
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  • 18.2k
3 votes

Watershed Analysis

Can I clarify, did you extract the basin for a specific point that you digitized? If so, did you use the Snap Pour Point tool to reposition your digitized point onto the 'digital' stream (i.e. the ...
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  • 10.8k
3 votes

How to avoid ImportError: No module named arcpy causing Failed to execute (Script) error?

You have now provided an error from IDLE in a Comment to your Question which is that it is: Traceback (most recent call last): File "C:\Users\LG\Desktop\peiramata\pythotwo.py", line 9, in ...
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  • 63.7k
3 votes

Automatically save outputs variables in folder workspace using ArcPy?

From what I understand, you just have to assign fill, Fdr and Fac the name you want to name those raster! They will be automatically saved to the arcpy.env.workspace. import arcpy arcpy....
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  • 1,630
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.
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  • 21.4k
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 ...
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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 ...
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  • 7,137
2 votes

Arc Hydro 2.0 for use with ArcGIS 10.1 (or later) for Desktop?

You can download ArcHydro 2.0 from here: https://mft.esri.com/EFTClient/Account/Login.htm You have to login with: Username: ADSRiverHydraulics Password: ADSRiver.2014 After login and ...
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  • 1,743
2 votes

Arc Hydro 2.0 for use with ArcGIS 10.1 (or later) for Desktop?

It looks like the Arc Hydro home page only has a link to Arc Hydro 2.0 (which I have not downloaded). However, Arc Hydro 10.2 was made available for download via ftp in August 2013. If you have any ...
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  • 63.7k
2 votes

Fill sinks error in arcHydro

This is a very common error when using ArcHydro, although the exact text and in which function it appears might differ slightly. You should check out the answer and comments in Error running Arc ...
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  • 4,892
2 votes

empty file geodatabase error (nowhere feature class)using arcpy

Still difficult to interpret your question but untested code below may help. import arcpy import os arcpy.CheckOutExtension("spatial") # only required if CatchmentPolyProcessing requires it arcpy.env....
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2 votes

Create stream network using ArcGIS

It sounds like you want to come up with your own threshold for determining streams based on the Flow Accumulation Values. You can do this using the Raster Calculator in Spatial Analyst (under Map ...
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  • 4,439
2 votes

What is Login to Esri FTP site for Arc Hydro Tools?

mkennedy's link explains it but here are the details in case those posts go missing again: Set your SFTP client to log in to: server: mft.esri.com username: ADSRiverHydraulics password: ADSRiver....
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  • 12k
2 votes
Accepted

Using rainfall data (raster) as an input to determine stream lines in Arc Hydro?

You are correct that Arc Hydro only uses elevation information to delinieate streams, catchment, etc. There is not a tool built in to do exactly what you're asking. Arc Hydro does provide other tools ...
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2 votes

Creating Stream Order

I gave a fairly detailed description of how these types of stream network operations work in my previous answer here. But if you're looking for the exact algorithmic solution for how stream cells are ...
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  • 10.8k
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 ...
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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 ...
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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 ...
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  • 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....
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  • 21.4k
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. ...
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  • 7,137
2 votes

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 ...
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  • 109
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 ...
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  • 878

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