Latest Contributions by MarkBoucher

It seems like you could determine the max value and then use the CON() function to set everything that is not the max value to 0 or null and then convert that to a point. ... View more

Zakir, My work around has been to NOT give up! I often (way to often) get this or other errors after attempting to create the fdr, fac, cat, str, strlnk, or cat layers (raster layers). What I do is I refresh the catalog. You will sometimes see three (3) files with the same name and different extensions. I keep refreshing the catalog view until I see the normal one file with the correct icon. I then look at the properties and see that the coordinate system is not set. I set it to what it should be, add it to the mxd and move on. This can be frustrating, and I don't know what's going on (why the error, but eventually the file is there, but it has no coordinate system) but it works. Mark Error: [ATTACH=CONFIG]16160[/ATTACH] After first refresh of catalog: [ATTACH=CONFIG]16161[/ATTACH] After second refresh of catalog: [ATTACH=CONFIG]16162[/ATTACH] ... View more

Are you setting the processing extents via model builder or the mxd? Does it make a difference? [ATTACH=CONFIG]16131[/ATTACH][ATTACH=CONFIG]16132[/ATTACH] ... View more

Check out this thread related to computer memory etc. http://forums.arcgis.com/threads/55351-CPU-speed-and-Memory-requirements-for-ArcHydro-and-Geoprocessing.   It has a link on the last comment to a second forum on the same subject. ... View more

Are you setting the processing extents via "Geoprocessing>Environments"? My practice has always been to extract by mask a rough cutout portion of the our countywide DEM before starting a ArcHydro project. I originally assumed I'd need to do this to limit the processing extents. All he ESRI examples do this. A second reason to extract the local DEM is to preserve the data set. The countywide data can be updated periodically. I'd like to preserve the dataset so that if the DEM changes, I can do a comparison to see if there will be different results in the future. So I've never run into your problem. I've had the batch processing run only for the batch point extents.  (http://forums.arcgis.com/threads/41988-Resetting-Raster-calculation-limits). This was before I knew about "Geoprocessing>Environments". So in my experience, I've had the opposite problem you are having. ... View more

You're welcome. Another tip is that once you create one Batch Point and the Batch Point layer is created, you can copy and paste other points to that layer and then just fill in the fields using the Field Calculator. There is nothing "special" about creating them using the Batch Point Generation Tool other than creating the initial layer. Another pointer is that once the layer is created, you may want to copy it to another layer. One thing I do with things start going south is I simply delete geodatabase and start over, keeping the rawdem, agreestream, innerwalls, and outerwalls layers. These four layers are the basis for the hydrologically correct DEM (fil). If you have them, and you keep the options simple, you will always get the same result when you get to the fil step. Since the Batch Point layer is in the geodatabase, its nice to create a backup so you don't have to recreate it if you decide to start over. I keep the four key layers outside of the geodatabase and raster folders. Also, I've posted a collection of ArcHydro tips here: http://forums.arcgis.com/threads/48100-ArcHydro-Problem-Solvers. I'm not the expert. I've just hit my head against the wall a few times and decided to memorialize some lessons learned (partially so I wouldn't forget them!) ... View more

Raster Extent Problem addressed: http://forums.arcgis.com/threads/41988-Resetting-Raster-calculation-limits ... View more

but I can't find a way to automatically generate the 3,000 batch points I have I often used the tools in HEC-GeoHMS (http://www.hec.usace.army.mil/software/hec-geohms/download.html). There is one under "Basin Processing" named "Import Batch Points" that might bring them all in for you. I've used GeoHMS tools  in the same "session" as ArcHydro without having to create a GeoHMS project. Those tools have come in handy many times. ... View more

HEC-GeoHMS keeps crashing my ArcGIS as its currently only available in Beta for ArcGIS 10 at this stage. Interesting. It does say GeoHMS for ArcGIS 10.0 is an "Early Access Preview (EAP)", but I've been using it for a while with little problem. ... View more

Sounds like a job for geometric networks. Arch Hydro will build a geometric network based on hydrologic layers it generates. I did an ArcGIS desktop search for "accumulation" and found "Finding the upstream accumulation" and it sounds like it would do what you want. I'm not sure if it will create a new raster with the results, but it might at discrete points/junctions in the geometric network. If it will save the results, maybe you could make your catchments small enough to make it discrete enough for you. ... View more

There is a tool in HEC-GeoHMS that does this. The program is written by ESRI and I found you don't have to create a GeoHMS project to used the tool. You just have to set the layers in the Data Management setting. Download it from the Corps of Engineer's HEC site (http://www.hec.usace.army.mil/software/hec-geohms/download.html) and install it. I believe HEC-GeoHMS 10 will, or will try, to install ArcHydro 10 also, so be aware of that in case you are working with an older version of ArcGIS. For you ESRI folks who might be listening, it would be handy to have this tool in ArcHydro. ... View more

Here's a possible solution: Using Spatial Analyst hydrology tools, calculate the stream order. Convert the stream order raster to polylines using the Conversion Tools/From Raster/Raster to Polyline (use the grid Value for the field). Do an Analysis Tools/Overlay/Spatial Join between the watershed/subbasin and the new stream polyline features. Transfer the stream order over to the catchments. I did this with a sample data set. It worked, but the results were not exactly what I expected. Could be because there are some first order watersheds that come in to the main river, and the spatial join transferred the stream order to them. If your results look good or you find a different solution, please share. ... View more

When you find a solution, please post it. I'm very interested in this.  Thanks! ... View more

The experts can correct me if I'm wrong, but another approach is to use Zonal Statistics as Table. This creates a table with all the stats in it. Process: Run Zonal Statistics as Table choosing a unique field in the polygon shapefile (FID works). the table with the statistics is added to the mxd. join the table to the polygon shapefile using the filed used in step 1. transfer the mean value to a field you created in the polygon shapefile using the field calculator. remove the join if you want. ... View more