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When I have problems like this I close ArcMap. Delete the geodatabases for the project (make sure you make a copy of the BatchPoints). Then I open ArcMap, reload the mxd, make sure the temp files are deleted, make sure the Target Locations are set right, etc. I use model builder to automate the process and reduce "fatigue" of running the many steps in Arc Hydro. This makes the struggle a little more bareable. Look at the Feb 5, 2013 post on Arc Hydro Problem Solvers (https://community.esri.com/message/45017#45017 ) for a doc with my check list.
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01-15-2015
08:15 AM
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Let me edit and set as only selectable layer on one command... or button to make editable layer only selectable layer. I always have to do both steps when I edit.
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01-08-2015
03:23 PM
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I'm looking for input or other's experience on an approach to smoothing the LongestFlowPath polylines so that the Shape_Length is more accurate. I am comparing a recent Arc Hydro analysis with a past manual effort. I'm finding that the LongestFlowPath as calculated by the Shape_Length is much greater than that measured by hand. Supposedly something measured using GIS would be more accurate than measuring the same thing by hand: at least more precise and repeatable. In the past, an engineer's scale or wheel was used to measure the LongestFlowPath (L) on paper topo or a USGS quad map. However, when using GIS in my test case, L goes from 5.25 miles measured manually to 6.1 miles using Arc Hydro! A separate manual measurement was done by a third party and they recorded 5.6 miles. This length L and the CentroidalLongestFlowPath (Lca), which is base on the L, are used in our lag equation. So, I am forced to study the GIS process to determine what's up. I reviewed the polyline visually and found that because the polyline "bounces" around from DEM grid center to grid center, it is longer. The bouncing is most notable when the bearing on the creek is at 45 deg. There are places where GIS more accurately follows the creek than hand measurement and that is good. A past effort totally cut across an oxbow. I want the GIS analysis to more closely follow the "hand" method because the equations were developed a long time ago when "human error" was a part of process. I have used the Cartography Tools.tbx\Generalization\Smooth Line tool to see what level of smoothing could be acceptable. I want to establish a standard practice so that the results from GIS are more accurate than by hand, but that the precision doesn't get so good that it overestimates the L. In the PAEK method under this tool there is a smoothing tolerance. I've run the PAEK method with various values to determine which value does what I want without overdoing it. The attached jpg shows the original L (dashed) compared to smoothed polylines using tolerances of 20ft, 30ft, and 50ft. I also ran it with 100ft just to see the far end of the spectrum of results. The DEM is 10' x 10'. I am wondering if anyone else has dealt with this issue. Thanks. Mark PS - In the attachment there are two dashed lines. The dashed line with light green is the original L from Arc Hydro with a length of 6.1 mi. The second one with white was done manually in GIS and has a length of 5.8 miles.
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01-08-2015
10:28 AM
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Is there a way to zoom to a selection or data set in model builder?
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01-07-2015
08:07 AM
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Ivan, There are several things I do to reduce the number of errors when using Arc Hydro. A while back I started a thread called "Arc Hydro Problem Solvers". It became a repository for dealing with errors. You can find it at ArcHydro Problem Solvers Maybe you can find something in there that will address this error. Best, Mark
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12-31-2014
07:52 AM
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The problem with the FAC values is that they seldom increase by 1. You will only find your exact FAC value if you are really really lucky. Try this: Use the Con() function to set a 1 for those FAC values higher than you target (lower in the watershed). Use the Con() function to set a 1 for those FAC values lower than your target (higher in the watershed). Convert the two resulting rasters to polygons. There will be a gap between the two polygons or their edges will touch. This is where your target would exist if it did exist. It would be the closets you will get to the answer.
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12-30-2014
09:02 AM
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I've never seen red lines like this if the process completes as it should. Sometimes Arc Hydro will "leave" some graphic points or lines (not GIS data or layers) if the process doesn't complete correctly for some reason. These can be selected as graphics and deleted. I would look at the results and make sure the process completed correctly. I assume by with imposed drainage line and wall you mean you are burning streams and building walls, right?
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12-30-2014
08:28 AM
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Josh, I've posted several "solutions" to Arc Hydro problems at ArcHydro Problem Solvers. You can peruse this for other solution ideas. The "HRESULT E_FAIL" type error could be due to two things (my best off the top of my head guess). Having your project files on a server. Put them on your local drive - runs faster and with fewer errors like this. Put as much of your data as possible in geodatabases. They are more stable than regular shape files. Mark
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12-05-2014
12:45 PM
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If your image is zoomed all the way into a raster cell, I would suspect you need to set tolerances equal or that you are expecting too much precision.
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12-05-2014
11:22 AM
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I don't find the GeoNet forum that easy to use. I'm going to try out Geographic Information Systems Stack Exchange and see if it is a good replacement. I'll still look here from time to time. If GeoStacker works better, I may abandon this format. Just not that good of a format for a forum. Go to this discussion to see what others think. https://community.esri.com/polls/1059?et=watches.email.poll_comment#comment-6408
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10-29-2014
11:54 AM
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This is a wild guess... Make sure your raster names are not to long. Sometimes (but not all the time) there is a limit of 8 characters. When I see a tilda "~" in a name, it makes me think that maybe the program is shortening the name someplace. Then, when it tries to call it up, that file isn't there under that name. If its is not the file name, maybe the directory name has a character in it that might be recognized by the operating system, but not the program. I don't typically use spaces, dashes, and other special characters (@ $ & ^ > ~ etc.) in my directory or file names. Underscores are OK (_)
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10-20-2014
12:59 PM
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If you are new at working with Arc Hydro, you should check out the thread at ArcHydro Problem Solvers In that are tips on how to reduce the chances of errors and other problems I've had with Arc Hydro.
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10-13-2014
07:43 AM
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If you have a stream gage location you want to calibrate to, it seems that you could do a separate watershed delineation just for that point. Then after calibration, use the parameters you used for that watershed in the greater model. This would help you avoid having to shoehorn the gage point into the current model.
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10-08-2014
08:28 AM
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In trying to explain to a fellow GISer in the office what an HRESULT error looked like, I ran across this link by ESRI. ArcObjects error codes Per this webpage, (paraphrased): HRESULTs numbers are returned in an eight-digit hexadecimal form or a 10-digit decimal form. The majority of the ESRI ArcObject's error code enumerations are in the 10-digit decimal format. If you have received an eight-digit hexadecimal error code, convert the eight-digit hexadecimal to a 10-digit decimal. This conversion is not difficult and can be accomplished with the Windows Calculator. So, if in 10-digit decimal format, you can lookup the HRESULT number on a list to find out what the heck the error is sort of about. I haven't tried this, but maybe I'll be able to more than throw up my hands, furrow my brow and stomp off like a two year old when I get and HRESULT error. If this works to reduce my grey hair production, it will be time for a post office celebration trip to conference room Q (or Cue.... a local pool hall and bar). (ugh - This is starting to look like a Facebook post...)
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10-01-2014
02:34 PM
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