Latest Contributions by MarkBoucher

Inglés: I would make the sharp drop units larger. Maybe making the sharp drop the same as the smooth drop causes problems. The sharp drop can be very large. The goal is to get the flow direction correct, not to make the digital elevation model match the real world. Español:(translated using http://translate.google.com/) Me gustaría hacer las unidades de fuerte caída más grande. Tal vez lo que la fuerte caída de la misma que la suave caída de lugar a problemas. La fuerte caída puede ser muy grande. El objetivo es conseguir que la dirección de flujo correcta, no para hacer el modelo digital de elevación coincide con el mundo real. ... View more

English: It helps to put the data on your local computer and not do the work over the computer network. You can click on the link below my signature to see other tips on use Arc Hydro. Spanish: (translated using http://translate.google.com/) Ayuda a poner los datos en el equipo local y no hacer el trabajo en la red informática. Puede hacer clic en el enlace debajo de mi firma para ver otros consejos sobre el uso del Arco Hydro. ... View more

Make sure that the feature is the only one selected. If something else is selected, even though its layer is turned off, the tool won't work. ... View more

Go to layout view. Add the legend and organize the layout as you want it. Go to "File>Export" and choose the format you want to export to, etc. My license is down and so I can't verify this process right now, but I'm pretty sure that should work. This will be an image for sharing (like I did in this thread), it will not likely be good for Arc Map data or be georeferenced. I think if you do the export from data view, the image might be georeferenced, but you won't get a legend since that only works in layout view. I suppose you could screen capture the legend and paste it into data view if you want the data part to be georeferenced and have the legend also. ... View more

The Arc Hydro help states: If there is a grid that has a tag "Sink Watershed  Grid�?�, it will be used as a  default for the third input. If not, the user needs to select a grid that will  be tagged with the "Sink Watershed Grid�?� tag at the end of the operation. This  input is optional. Is your grid "'tagged as" Sink Watershed Grid?  I'm not sure what "tagged" means.  It definitly should be a grid. Maybe it needs to be in integer instead of a float grid. ? The Arc Hydro tool box help says: Input SinkWatershedGrid  (optional) Input Sink Watershed Grid. Used to mask the sink watersheds when stream  segments should not be created within sink watersheds. Note here there are no spaces in SinkWatershedGrid. ... View more

Ali, I believe up on the screen is default for Arc Map is north. To check this issue, I had to convert the data to create the DEM the way I  know how. There were some negative lat/long valuse that I changedBelow is a jpg of my work on the DEM you sent in xlsx format. I assumed a 10'x10' cell size (but that shouldn't matter for checking direction). Format you sent it in:           Lattitude   Longitude   Bedrock        -2   48   12.5179        -1   48   12.4755        0   48   12.4015        1   48   12.2358        2   48   12.124        3   48   12.1508        4   48   12.2076        5   48   12.179        6   48   12.2155        7   48   12.244        8   48   12.2862 . . .  Format I converted it to: NCOLS 29 NROWS 51 XLLCORNER 290 YLLCORNER 510 CELLSIZE 10 NODATA_VALUE 0 12.5179 12.4755 12.4015 12.2358 12.124 12.1508 12.2076 12.179 12.2155 12.244 12.2862 . . . This is the resulting flow direction grid. The red lines are flow trace paths using the Arc Hydro flow trace path tool. all the paths flow south (down). [ATTACH=CONFIG]31186[/ATTACH] ... View more

According to the ARCGIS help 64 means flow from down slope to up slope. 64 means the flow is to the north. (See image). The only other number I know of that is not shown on this graphic is 255 which defines the cell as a sink. See also http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=flow_direction [ATTACH=CONFIG]31183[/ATTACH] ... View more

I rarely run the sink tool. I tried to run it and got an error (wouldn't even start to run). Then I realized the the input file is not the DEM but the fdr (flow direction grid). When I used the flow direction grid, it showed a raster range from 0 to 255 with all values "null". So, unless I created the DEM incorrectly, the sink tool is giving me the same answer I get other wise. The way I identify the sinks is I use the raster calculator to subtract the rawdem from the fil dem. I can then color ramp it with dark blue for the high value (deep) sinks and a lighter blue for the shallower sinks. In your dataset I still find no sinks. ... View more

Ali, I created a raster from the xlsx file. When I run the fill tool on it, it runs fine. It also has not cells to fill since there is not local low point that is not on the edge of the raster. I'm running 10.1 and ran the fill tool in both Arc Hydro and Spatial Analyst. ... View more

The goal of the DEM reconditioning using Spatial Analyst or Arc Hydro tools is to get the flow direction right. When I work on the stream burning step, I try to minimize the width of the burn by making the stream buffer only 2 cells wide. You may be able to make it just one cell wide, but I vaguely recall that not working well so I've stayed with 2. I work with a 10x10 dem. The walls have to be at least 2 cells wide or you will get "leakage" via the diagonal. I also minimize where I put the streams to burn. If the rawdem is good for the flow direction, I don't put a line in it. I only put in lines at bridges and culverts. If I have a stream layer, I will buffer the road layer and use that to clip the stream layer so I only have short segments at the stream crossings. Of course I have to review the crossings to make sure the stream polyline is "correct". So, does burning streams introduce error. Yes. Does the rawdem have errors already? Yes. If you are diligent enough you can make the rawdem better for flow direction determination and minimize the introduced error. ... View more

Check your processing extents and make sure your raster area is covered by it. ... View more

I found this related document and it has some info related to burning streams parameters.  See page 14. http://pubs.usgs.gov/ds/412/pdf/ds412.pdf ... View more

You can reduce the stream buffer to 2 and it will still work. This helps in some tight places. Setting it to 1 does not aways work for me. This is basically the width of the "slot" created during the "burn". This old forum post has some explanation of the other values. http://forums.esri.com/Thread.asp?c=121&f=1271&t=183236. ... View more

Have you tried starting over from scratch with just the rawdem, agreestream and innerwall data? I did this recently and it helped be get past some unknowable problem that was hanging up the AdjointCatchment creation process. My view of it is that starting from scratch makes sure there isn't some residual setting or variable that is hindering the process. If you put the new mxd in the same directory, it is good to give the data frame a different name so that the folder and dataset names don't conflict with the old ones. To avoid this hassle, I will often close Arc Map and using Windows Explorer delete the folder with the rasters and the geodatabase created by Arc Hydro. These are all recreated when you run Arc Hydro tools. The only layers I save are rawdem, agreestream, innerwalls and outerwalls (not used much). I will also often save the batch points if I set them manually since is can take time to set them in the right place again. If you copy the batch points in the save batch point layer to the new geodatabase for the file and data frame, you have to set the "BatchDone" value back to 0 so the batch watershed or subwatershed delineation tools will work. Hope this helps. ... View more

I think you will find that this can't be done even if you change the data frame properties/frame background to none. I tried to do it using a clip to a shape and it always looked good on screen, but would not plot. I recall a forum post that came to this conclusion with ESRI staff explaining that it would not work. If you find out differently, certainly post your finding! ... View more