Latest Contributions by MarkBoucher

You're welcome! ... View more

Try this... Make sure you are not looking at any of the project files (mxd, or layers) in Arc Catalog. Close Arc Catalog, or any other program that could be previewing your files. ... View more

Sometime back I looked deep in to the bowels of the error log and found that some of the files paths were cut off.  It is like reading the Matrix monitor sometimes . You'll understand if you've seen the movie http://www.maximumpc.com/article/features/screensaver2013. I found my original post on this here (part of the problem solver thread linked under my signature): http://forums.arcgis.com/threads/48100-ArcHydro-Problem-Solvers?p=166587&viewfull=1#post166587 This was not a matter of spaces in the folder or file names, it was a matter of the name being truncated due to length. (I just rechecked the post. It does not appear that the log file itself has a limit in characters. ESRI would know for sure.) For example, something like this: P:\GIS USERS - Development\FC\Hydrology\Projects\DA 108\Round_Valley Would be truncated to this: P:\GIS USERS - Development\FC\Hydrology\Proje  (I don't recall if there was a specific limit on the number of characters.) I moved my work to another directory, closer to the root like this: P:\ArcHydro\DA 108\Round_Valley After the change, the problem went away; even when operating over the network. Still, working over the network tends to produce errors. ... View more

I usually use Arc Hydro and not the Spatial Analysts Hydrology tools. If you apply a color ramp to your flow accumulation grid (fac) you should be able to see they high accumulation flow paths. You can use this to check that the pour points are snapping to the fac. Also, I believe in the Snap Distance in the Snap Pour Point tool is in map units (feet or meters) and not the number of grids the point is away from the high fac path. Since the tool doesn't present units in the input dialogue, it is not immediately obvious. The help box, if shown, does say this though. Another issue I've run across is the processing extents being reduced to something less than the extents I want. Under Geoprocessing>Environments>Processing Extent choose a layer that covers the area you are processing. The fac grid would work here. ... View more

Rasters can be created/converted in/to different formats. http://resources.arcgis.com/en/help/main/10.2/index.html#//001200000032000000 I've heard that the grid format is more efficient. Also, having the raster in a gdb may make some difference. Frankly, I don't deal with that many different raster formats, but possibly a certain raster format may take less memory to process and so that might get around the size issue. Might be worth some research. ... View more

I'm following these two forum posts that present questions about "stripe" patterns. There is some discussion on solutions that move in the direction of raster size as a problem for some older versions. The "grid" pattern is not part of the discussion. I don't have time to filter through the forum content for a solid recommendation, but maybe there is one in there that can help you. The second link is imbedded in a comment on the first one. http://forums.arcgis.com/threads/17237-Problem-running-Region-Group-tool http://forums.arcgis.com/threads/97714-Problem-with-query-builder-and-output-raster-for-the-quot-Extract-by-attribute-quot-tool?p=347326#post347326 ... View more

A David Curtis, PhD with West Consltants had done extensive work with radar and storms. I found his resume at http://www.ametsoc.org/boardpges/cwce/docs/profiles/CurtisDavidC/resume.pdf.  I don't know if he would give you a GIS answer, but there might be something in his work that could help. ... View more

See http://forums.arcgis.com/threads/79329-ArcHydro-Tutorial-and-Documentation?p=348414&viewfull=1#post348414. It could be that data is only for those who have paid for a class from ESRI. ... View more

You should be able to get a good longest flow path by creating the different data layers in the right order. From your description it seems as if you are trying to get it by trial and error. This forum post provides some good links to explanations on ESRI's site. http://forums.arcgis.com/threads/48100-ArcHydro-Problem-Solvers?p=269982&viewfull=1#post269982 This link to a forum outlines the process without longest flow path. http://forums.arcgis.com/threads/76491-unable-to-recondition-or-burn-stream-into-raster?p=268404&viewfull=1#post268404 These can be found at the link below my signature. The longest flow path process is one of the longest, at least when doing more than one watershed at a time, so you need to be patient. ... View more

It is likely that your processing extent does not cover all of your data.  Reset the processing extents under the menu Geoprocessing>Environments...>Processing Extent. At this point, choose a  data set that covers the the area you want to process. Check out the Arc Hydro forum sticky "Arc Hydro Problem Solvers Thread" for other helpful tips. ... View more

This sound very familiear... I searched "stripes" and found this thread. It appears there was a fix for the issue it is about. http://forums.arcgis.com/threads/17237-Problem-running-Region-Group-tool I'm not sure if it relates directly to your situaton. However, your problem has been discussed in the forums. A search for "stripes" or "bands" may lead you to a solution. ... View more

You can find tips ArcHydro process helps and tips at the link below my signature. These apply somewhat to Spatial Analyst>Hydrology tools. ... View more

I don't have time to delve into this right now. Check out the posts at the link below my signature. Tips may help you work around the issue. ... View more

Some thoughts... Errors like this can happen if you are processing the data over a network. Try processing it on your local drive if you are not already. Make sure you save your project before processing! If not, Arc Hydro can't do certain things. Make sure the geoprocessing domain covers all of your data. Geoprocessing>Environments>Processing Extent. You can visit the link under my signature to find solutions to common Arc Hydro problems. Thread #18 has a checklist that can help your avoid problems. (http://forums.arcgis.com/threads/48100-ArcHydro-Problem-Solvers?p=270146&viewfull=1#post270146) ... View more