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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 ...
John's user avatar
  • 3,853
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 ...
jcholly's user avatar
  • 166
3 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. ...
GBG's user avatar
  • 9,910
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 ...
GBG's user avatar
  • 9,910
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 ...
Emil Brundage's user avatar
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.
FelixIP's user avatar
  • 23k
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 ...
Richard G's user avatar
  • 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....
FelixIP's user avatar
  • 23k
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 ...
FelixIP's user avatar
  • 23k
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(...)
Martin's user avatar
  • 4,928
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 ...
countrytoast's user avatar
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 ...
Hornbydd's user avatar
  • 43.7k
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 ...
Matt's user avatar
  • 752
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 ...
BrendenM's user avatar
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 ...
Canna's user avatar
  • 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 ...
Jacob Helfman's user avatar
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 ...
PolyGeo's user avatar
  • 65.2k
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 ...
BBG_GIS's user avatar
  • 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 ...
UnsoughtNine's user avatar
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 ...
Marlon Calispa's user avatar
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 ...
FoolzRailer's user avatar
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 ...
Hornbydd's user avatar
  • 43.7k
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 ...
Priscilla's user avatar
  • 878
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: ...
Chang's user avatar
  • 300
1 vote

Automatic Watershed Delineation in ArcGIS Desktop and Arc Hydro?

This may have been answered already, but I thought I would post here for those that come across this question in the future, as I have today. I ended up creating a process model to perform ...
DragonflyForWater's user avatar

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