Latest Contributions by MarkBoucher

‎07-14-2011

I did a quick try of this. I have v10.0 SP2. I also got no result of -1, -1 for the NEAR_FID and NEAR_DIST. Then then found that if my shore line was in a geodatabase, I got -1, -1 for the NEAR_FID and NEAR_DIST. Once I exported the shore to a shape file, it worked. I also found that if I was re-running the Near function, I needed to recalculate the NEAR_FID and NEAR_DIST to 0 using the field calculator before I got any results. Hope this helps.

‎07-12-2011

They aren't batch points, they're polygons. Does the same apply? Oh. I have not used polygons in a batch delineation. I don't know if it applies.

‎07-11-2011

Make sure the batch points are on a stream in the stream link grid.

‎06-06-2011

Have you run the fill sinks function? I think the burn streams function only lowers the DEM where the streams are by a constant value. If there are localized low points in the stream, you would still have localized low points in the stream. The fill sinks function would fix this problem. Also, if the stream is not "wide enough" (at least 2 cells), you might have similar problems (though I'm not certain about this). Mark

‎05-31-2011

I found out that my streams has breaks. Are you using the DEM Manipulation functions under Terrain Processing? If the streams are discontinuous, and you haven't burned in the streams, stream crossings such as bridges or culverts may cause a rise in the DEM that will "block" the flow direction and "stop" the stream. Mark

‎05-25-2011

Arc Hydro takes the Flow Accumulation (fac) and with a Stream Definition function allows you to put in the number of cells at which to start a stream. Then with Stream Segmentation and then Catchment Grid Delineation you get a catchment grid. Another function converts the grid to polygons.

‎05-06-2011

Make sure you don't have anything selected before that process is started. Running from model builder sometimes reveals more feedback, though it is not all that descriptive most of the time.

‎04-27-2011

Check out http://forums.arcgis.com/threads/28817-calculate-distance-between-points-along-stream-network

‎04-27-2011

I've seen several threads about Arc Hydro not working as expected. On a few of them I've responded the same way. I'm in the middle of an Arc Hydro project and I am finding functions not working as expected just like a I see on a lot of these posts. My solution is as follows (it works almost every time): Arc Hydro may be trying to create temp file that already exists. In my Arc Hydro training at ESRI I was told that, when things start going "funny": close ArcMap, go to your temp directory - In Windows 7, mine is at C:\Users\mboucher\AppData\Local\Temp delete everything you can. You can tell if this is where the ESRI program puts temp files, by: open the folder, sorting by date (new to old), and starting ArcMap. If this is the right directory, you will see temp files being created. There are some files that you can't delete while other programs are running, so you may have to close all programs to delete all the files. There was usually one or two that I cannot delete. I assumed it was related to Explorer. You can also delete files using Arc Catalog. Using this you can see the temp rasters, etc. When this does not work. I close Arc Desktop and use Arc Catalog to delete shape files and rasters that I'm needing to create. I do this to ensure that there are no write protection errors causing problems. I'm using Arc Hydro in Arc Desktop 10 with Windows 7. Cheers. (P.S. - ESRI, if you're listening, please fund those guys working on Arc Hydro so they can build in some safeguards against these kinds of problems! We've got better things to do than rant at our computers over these things! Thank you!)

‎04-27-2011

The longest flow path function is part of ArcHydro. It is free. May take a little while to learn it though.

‎04-27-2011

The longest flow path function is part of ArcHydro. It is free. May take a little while to learn it though.

‎04-22-2011

Could you use the cost distance tool in Spatial Analyst? Use the stream to set a low cost in a raster along the stream and high cost elsewhere. Then do a cost distance calculation along the stream with a source grid at one end. Then then pick the cost off the resulting grid where the points are and take the difference in cost distance between points. (?)

‎04-18-2011

C:\Users\mboucher\AppData\Local\Temp. To find this directory you may have to change your Windows Explorer settings to show hidden files. In Windows 7 this is under Organize > Folder and search options > View tab > Hidden Files and folders > Show hidden files, folders, and drives.

‎04-18-2011

In my Arc Hydro training with ESRI I was told that, when things start going "funning", get out of ArcMap, go to your temp directory and delete everything you can. Then start up again. This has cleared things up for me many times. In Windows 7, mine is at C:\Users\mboucher\AppData\Local\Temp. You can tell if this is where the ESRI program puts temp files, by opening the folder, sorting by date (new to old), and starting ArcMap. If this is the right directory, you will see temp files being created. There are some that you can't delete while in other programs so you may have to close all programs to delete all the files. There was usually one that I could not delete. It's name became familiar and I assumed it was related to Explorer. This was such an issue for me at one time that I had a shortcut of the temp directory in my tray and opened it all the time to make sure ArcMap/Arc Hydro wasn't frozen. Hope this helps.

‎03-18-2011

The stream layer is a polyline layer. The "walls" are known watershed boundaries and this is the form of a polygon layer. I recall trying to use a polyline layer for the walls at one time and having it work, but I usually use a polygon layer. What Arc Hydro does is, it takes the DEM that streams are being burned into and it reduces the elevations of the cells that intersect the streams polyline plus the buffer(s) by the amounts you set. Then the elevations of the cells the wall polygon perimeter intersects (or the wall polyline intersect) are increased by a amounts you set (use at least 2 grid cells). The final DEM, in fact, can have very deep streams and very high walls. The goals is not to create a perfect DEM from which accurate contours can be made. What you want is an accurate flow direction grid. That then becomes the basis for your flow accumulation grid, etc. I do the fill after burning stream and building walls just to make sure the bottoms of the fill streams don't have any localized low points that will mess up the flow direction grid.

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My Ideas

Latest Contributions by MarkBoucher

Re: Calculating Stream Gage Distance to Coast

Re: Batch Watershed Delineation for Polygons

Re: Batch Watershed Delineation for Polygons

Re: Watershed delineation

Re: Watershed delineation

Re: Create 'sub basins/catchments' of a defined size

Re: ArcHydro 9 & 10: Adjoint Catchment: Empty Feature Class

Re: Distance to Next Downstream Point

Solving Arc Hydro Problems by deleting TMP Files

Re: Flow Length �?? Understanding Output Raster

Re: flow length tool to calculate the longest stream in a watershed

Re: calculate distance between points along stream network?

Re: Catchment Polygon/Adjoint Catchment Problem

Re: Catchment Polygon/Adjoint Catchment Problem

Re: subbasin creation using arc hydro

Re: Error HRESULT E_FAIL has been returned from a ...

Re: DEM Reconditioning does not change DEM

Re: Editing features do not show change until exit...

Re: Why can't I define a stream network?

Re: Hidden/Stacked polylines