Latest Contributions by AlexanderMa

‎09-16-2016

Created multiple polylines that I identified with the field "Poly_ID" Densified the vertices to a 10-foot spacing Interpolated the polylines on a DEM raster (3-foot cell resolution) Converted the polylines to points Created fields "Poly_ID", "X", "Y", and "Z" Calculated values for "X", "Y", and "Z" Goal: Let's say the average number of points for each unique "Poly_ID" is above 1000 but I need to trim it to 500 points. Question: Aside from starting over with the generalized set of polylines, what process(es) should I utilize that helps me trim the number of points down such that if I were to plot the points before trimming and after trimming on a profile, the differences would be minimal? An example of this in HEC-RAS, a non-GIS environment, where you can copy and paste cross-section stationing and elevation, go into tool called "Cross-Section Point Filter" and have the program maintain the integrity of your profile while reducing relatively redundant points.

‎04-02-2015

Just recently, I've been unable to export or print an MXD that contains the Federal Emergency Management Agency (FEMA) National Flood Hazard Layers (NFHL). I went to FEMA's GIS Web Services site (FEMA's National Flood Hazard Layer) and followed their instructions on adding their service layers as an ArcGIS REST Service. The layers that I'm trying to show on the MXD is the Flood Hazard Zones. The service layers display perfectly in the MXD; however when I go to print to PDF (I also tried exporting to PDF), the service layers will not print. Has anybody come across this situation?

‎03-24-2015

Hi Peter So in the dialogue box, the line that says "Computing longest flow path for catchments 219..." the number was increasing all the way to 219. I've taken a screenshot of the Longest Flow Paths for Catchments (LFPC) feature class that was created and it looked like it didn't stumble on the first flow path line. In fact, it computed a great deal of the DEM extent (2,735 flow paths computed). As an aside, both versions 10.2.0.96 and 10.2.0.110, created the same number of LFPC (2,735 flow paths). To put things into scale, this subwatershed test area is a little more than 4.5 square miles, and the DEM extent is approx. 95 square miles. Based off of the error message, there seems to be some sort of memory cap that ArcHydro is reaching before it quits. When trying to get an idea of the amount of data that was in the LFPC feature class, I exported it to a shapefile and it was approx. 183 mb. To me, it would be understandable if the data being created was something large (gigabytes). Anyway, I hope that this answers your question. As for me, I'm left with a few more unanswered questions regarding my initial issue.

‎03-24-2015

FYI, I tried the same process on ArcHdro v.10.2.0.96 and I came across the same error. Here arethe environment specs: Windows 7 Professional 64-bit (6.1, Build 7601) Service Pack 1 Intel Xeon Quad Core 3.1 GHz 12 GB of RAM NVIDIA Quadro 600 ArcGIS 10.2.2 for Desktop Arc Hydro Tools (x64) v.10.2.0.96

‎03-24-2015

Peter, I'll give ArcHydro v.10.2.0.96 a try, per your recommendation. We use a floating point integer DEM since our application area is primarily in the Bay Area of California (relatively low terrain relief). If ArcHydro v.10.2.0.96 doesn't work, then I'll consider converting my DEM, but only as a temporary workaround. Again, thanks for the pointers.

‎03-24-2015

Hi Peter Thanks for responding. I thought I had put my ArcHydro build number but it looks like I've overlooked that. I'm currently using ArcHydro v. 10.2.0.110, which I've checked is the latest build on the ArcHydro FTP server. Additionally, I periodically check ESRI's FTP server to see if there are ArcHydro updates. I'm hesitant on downgrading to v. 10.2.0.96, mostly because in earlier versions I had an issue with creating batch subwatershed delineations. If things get a little dicey, I may test out v. 10.2.0.96, but at the moment it's not at the top of my priority list. Thanks for your input and if you hear of anything else, I'm open to ideas!

‎03-18-2015

Preface: This is similar to the post I made in 01/19/2015, except the issue back then was that the newest build was not successfully running the batch subwatershed delineation tool. The newest ArcHydro build fixed this particular issue; however, another issue arose when running the Longest Flow Path for Catchments tool.Christine Dartiguenave has been great in assisting me with these issues and I'm hoping to call upon her guidance, yet again! When previously running ArcHydro tools, I was able to perform the Longest Flow Path for Catchments (LFPC) tool with ease. Since then, I have noticed that there has been quite a few updates within the last couple of months. The issue that I'm having is that both the Toolbar and Toolbox tool for LFPC error out, where normally it successfully ran (I've kept a control working folder to test the ArcHydro tools). The control working folder that I have, stores the ArcHydro files in the default formats for rasters and shapefiles. Furthermore, I've cleared out the temp folder, ApUtilities > Additional Utilities > Clean User's Temp Folder. I'm stuck and I wonder if this is something attributed with the new build or if I'm in error. Any help at all is greatly appreciated! Here are my environment specs: Windows 7 Professional 64-bit (6.1, Build 7601) Intel Xeon Quad Core 2.8 GHz 11 GB of RAM NVIDIA Quadro FX 580 ArcGIS 10.2.2 for Desktop (ver. 10.2.3552) edit: Arc Hydro Tools (x64) v.10.2.0.110 The error message is as follows:

‎01-19-2015

Hi Peter, Thanks for replying so promptly! I'm currently looking on the ESRI ArcHydro ftp site (https://mft.esri.com/) and I don't see the v.10.2.0.40 install folder located on there anymore. The current version of ArcHydro that they have on the FTP is shown in the screenshot below, of my installed programs. I'm thinking of just downgrading each ArcHydro version until it works; however that sounds really tedious. Any other suggestions are greatly appreciated!

‎01-16-2015

I actually have the same problem on my end. I tried adding a string variable (i.e. "test", "SubwatershedPoint", etc.) and would run this tool in ModelBuilder. However, I'm met with the error, below. I'm stuck on the step to create Subwatersheds yet the Help does not provide any information on what parameters to put in the field. My computer specs are shown below. archydro‌ esri help‌ water resources‌ modelbuilder‌ arc objects‌ batch_subwatershed_delineation‌ Windows 7 Professional 64-bit (6.1, Build 7601) Intel Xeon CPU Quad Core 2.80 GHz 12 gb of RAM NVIDIA Quadro FX 580 Start Time: Fri Jan 16 16:47:44 2015 Object reference not set to an instance of an object. Failed to execute (Batch Subwatershed Delineation). Failed at Fri Jan 16 16:47:44 2015 (Elapsed Time: 0.45 seconds)

‎01-16-2015

Do you have a toolbox directory on your program install folder? E.g. I have a 64-bit ArcGIS installation, so my toolboxes would be here: "C:\Program Files (x86)\ArcGIS\Desktop10.2\ArcToolbox\Toolboxes" If your answer is yes to #1, then did you add the toolbox library to your toolbox list? I've found that when upgrading from an ArcGIS version (in my case, we went from 10.1 to 10.2) some of my ArcHydro Toolboxes went missing, and thus, my ModelBuilder routines were invalid. After repathing to my toolbox directory, the problem was solved.

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My Ideas

Latest Contributions by AlexanderMa

Filtering similar point elevations

Issues with FEMA NFHL layers?

Re: Longest Flow Path for Catchments

Re: Longest Flow Path for Catchments

Re: Longest Flow Path for Catchments

Re: Longest Flow Path for Catchments

Longest Flow Path for Catchments

Re: Arc Hydro: Batch Subwatershed Delineation

Re: Arc Hydro: Batch Subwatershed Delineation

Re: Automating - Arc Hydro - Watershed Processing - Batch Subwatershed Delineation

Longest Flow Path for Catchments