Latest Contributions by NicoleCarlozo

I was also having problems with the Weighted Sum tool outputting a complete "NoData" raster. I checked the extent and the inputs, but could not find any problems. I ended up opening a new model and recreating the work flow from scratch. After re-building the tool within model builder, the tool worked perfectly. ... View more

I was also having problems with the watershed tool, but with the tool producing an empty output. My inputs were the flow direction raster and a feature class (polygon representing a wetland area). This was set up as a loop to iterate through multiple wetland sites. However, the loop would stop when an empty output was produced. I found that setting the snap raster and processing extent to the original DEM (not to the flow direction raster) did the trick. Thought I'd post the solution here in case anyone else has similar issues. ... View more

Thank you for trying - I appreciate it! When I burned the stream into the DEM, I made sure the stream value was -1000 with a buffer of -100. I used the stream raster of value 1 as the input into the stream order tool. I think the stream raster sometimes looks like there are 2 cells because the polyline curves or runs along the edge of the raster cell. I'm not sure how to get around that. ... View more

Thanks for the clarification. I tried what you suggested, but the result did not change. When creating the stream raster, I made sure the cell size matched the DEM. I also tried using the default cell size and a very small cell size. The same problem occurred. In environmental settings, I tried snapping the stream raster to the DEM during processing, as well as not snapping. Still no change. My workflow: 1) Polyline to Raster conversion (1 on a background of NoData) 2) Burn the polylines into the DEM. 2) Fill the burned DEM 3) Flow Direction 4) Use the stream raster and flow direction outputs in the Stream Order tool. Could this problem be due to a high resolution DEM? Since I am using a buffer (-100) around the stream lines, I'd think that the flow path/direction would not be a problem. ... View more

Thanks Mark. The SA Process you described makes sense, but when I followed it, the output did not make sense. Within a branch, the stream order values fluctuated (see attached for an example/screen shot). Is this what you meant by parallel streams? I did use a small buffer as you suggested, but I could make it wider. Within the stream order tool, I used a raster version of the stream polyline and the flow direction output. Is there an easier way to perform this analysis within ArcHydro? ... View more

Thanks Mark, The lidar is in a raster format. I am having problems with the lidar results due to the ditching/artifical paths that are abundant in my study site. The Hydrology Toolbox first output "streams" in the middle of ag fields. I changed the CON value to produce an output more in line with my polyline file, but I still had the same problem. Now I am circling back to assigning stream order values to the polyline file I already have. If my study area was at a smaller scale, I think the lidar method could be used. But I am looking at county-wide data. Does any initial processing need to be performed before running the "Create Drainage Line Structures" or "Assign River Order" tools? I feel like I'm missing something, but I haven't located any documentation that steps me through the process. ... View more

After attempting to create stream order attributes via Lidar processing using the Hydrology Toolbox, I have circled back to this. Due to low coastal elevations and landuse changes, the lidar output isn't lining up with the stream polyline data that I already have. I have a stream polyline, but I need stream order attributes. I have lidar, which I have used to create flow direction and flow accumulation grids. I attempted to use the "Create Drainage Line Structures" tool, however I received an error due to missing HydroIDs. I used the Assign HydroID tool within the Attribute Toolbox and tried again. It is still failing to execute. Am I missing something? Should I be using the lidar data as the raw DEM instead of the flow direction or flow accumulation grids? Do I need to specify file type? If anyone has any experience with identifying stream order using known streams and lidar, I would really appreciate the help. Thanks, Nicole ... View more

I was able to find the answer to my question here: http://gis.stackexchange.com/questions/36724/partitioning-a-line-into-segments While the "Split Line at Point" tool did not initially work, I just kept running it until it was successful. Not sure why it did not work initially. I think defining a processing extent helped. ... View more

I usually go to File -> Add Data -> Add XY Data. Specify the x/y fields and Coordinate System there. Then you can export the data into a shapefile. Sometimes it helps to open a new MXD. ... View more

I just downloaded the tool from the Editing Labs group. However, I am wondering if there is anything available to split multiple line segments within the same feature? ... View more

Mark - I see the SA tool, but it requires a flow direction raster and a stream raster. I don't see a "Flow Direction with Streams" tool. There is a "Flow Direction Tool" that requires a hydro DEM, but I only have a stream polyline/shapefile. Zye - The "Create Drainage Line Structures" tool requires a Raw DEM. Do you have any more information about the DEM specifics? Does resolution matter? ... View more

There is a tool in the Arc Hydro Tools toolbox > Attribute Tools toolset called Assign River Order that will calculates the stream order using 3 different methods I am interested in assigning river order to the NHD dataset. I just downloaded Arc Hydro for Arc 10.0, but I do not see the "Assign River Order" tool. I do see a tool for assigning a HydroID. Doe this need tobe used before determining river order, and where is the River Order tool located? Thanks, Nicole ... View more

Thanks Stuart, I was finally able to get permission to download this on my computer, but now the username and password aren't working. Is there a new procedure for obtaining the tool? Thanks, Nicole ... View more

I also found ArcHydro available for download here: http://resources.arcgis.com/en/communities/hydro/01vn00000010000000.htm Is this the most up-to-date version for Arc 10.0? Thanks ... View more