Latest Contributions by PeterWilson

Hi Simon I've been using the Spatial Analyst Supplemental Tools for quiet a while now for my hydrological model for determining average catchment slopes. When I determine watersheds for my rail or road alignments, they overlap of course. Graph Coloring is explained by William Huber: Exploding Overlapping Polygons into Non Overlapping Polygons.​ I suggest you look at repairing the geometry of your polygons or reload them into a new Feature Class. As I've not experienced any error message while using the following. I've attached portion of my python script below that I use daily for my hydrological modelling: ''' Created on Feb 1, 2016 @author: PeterW ''' # import site-packages and modules import arcpy # import custom python toolboxes arcpy.ImportToolbox("E:\Python\Downloaded\general\SpatialAnalystSupplementalTools\Spatial Analyst Supplemental Tools.pyt") # set input and output arguments raster_folder = arcpy.GetParameterAsText(1) fgdb = arcpy.GetParameterAsText(2) # set variables drain = "{}\\{}".format(fgdb, "Watersheds") slp = "{}\\{}".format(raster_folder, "slope") avgslp = "{}\\{}".format(fgdb, "avgslp") # determine the average slope for each watershed arcpy.AddMessage("Processing Average Catchment Slope") arcpy.ZonalStatisticsAsTable02_sas(drain, "HydroID", slp, avgslp, "MEAN", "DATA") #@UndefinedVariable ... View more

Pleasure Jerry ... View more

Hi Bill The following article might help you. Scheduling a Python script.​ ... View more

I've been using Eclipse\PyDev for the last five years and have decided to up my game. I'm currently setting up Python Virtualenv and GitHub to manage my Python Code. I've attached a print screen of my Eclipse\PyDev structure. This allows me to run any of my Python or ArcPy scripts outside of ArcGIS as well as schedule my scripts to run at any given time. ... View more

Dear Meng Xu I recommend that you have a look at the following Toblers Hiking Function​ posted by Nico. The python module that I developed incorporates Toblers Hiking Function as a Vertical Factor Table. This with the DEM determines the speed that one can walk as the slope changes including upslope vs downslope as well as direction. I merely created an euclidean distance raster based on my road network feature class as an additional cost factor to add as an impedance of movement off the road network, thereby ensuring the best path was along the road network. I unfortunately don't think that you can merely adjust the vertical factor table to increase the speed at which one can travel as the variables for vehicles vs walking are not the same. you might need to do some more research through google on models that have been developed for cars using the Path Distance Tool and how they developed cost rasters and vertical factor table. Hope the following helps. ... View more

Hi Luke and Dan I'm going to close the following as i feel the error messages that I'm receiving while trying to call Geo-HMS tools within Python are due to HEC-GeoHMS and not the Python Module that I've created. I've did a bit of research and found that ESRI has placed the ArcHydroTools.py module under the following directory: C:\Program Files\ESRI\WaterUtils\ArcHydro\Bin They generated a path file under the following directory that points to the module: C:\Python27\ArcGISx6410.2\Lib\site-packages So I've replicated the same for HEC-GeoHMS and I'm able to call GeoHMSTools within Python. The Centroidal Longest Flowpath tool still fails though and crashes Python. I'm going to open a new thread to see if anyone has gotten Centroidal Longest Flowpath to run from within Python. Thanks for all your assisstance. ... View more

Hi Luke I created the following directory and placed my GeoHMSTools.py module within the following directory. When I try to import GeoHMSTools module within Python it says it cant find the following module. >>> import arcpy >>> import GeoHMSTools Runtime error Traceback (most recent call last):   File "<string>", line 1, in <module> ImportError: No module named GeoHMSTools >>> I tried adding the path of the following directory to the environment settings, but it had no effect. ... View more

Hi Luke Thanks for getting back to me. I don't seem to have the following directory under C Drive: %AppData%\Python\Python27\site-packages. I've run the script tool within ArcMap and ArcCatalog with success. I tried Copy As Python Snippet and ran it within the ArcMap Python Interpreter: import arcpy import GeoHMSTools arcpy.CentroidalLongestFlowpath_geohms(in_subbasin_features="E:/Python/Temp/Model02/Model02.gdb/Layers/Subwatershed",in_centroid_features="E:/Python/Temp/Model02/Model02.gdb/Layers/Centroid",in_longestflowpath_features="E:/Python/Temp/Model02/Model02.gdb/Layers/LongestFlowPath_2D",out_centroidallongestflowpath_raster="E:/Python/Temp/Model02/Model02.gdb/Layers/CentroidalLongestFlowPath1") Runtime error Traceback (most recent call last):   File "<string>", line 1, in <module> AttributeError: 'module' object has no attribute 'CentroidalLongestFlowpath_geohms' As you can see the syntax  is different for some reason or other, than when I call the tool from within the ArcMap Python Interpreter: import arcpy import GeoHMSTools GeoHMSTools.CentroidalLongestFlowpath(r'E:\Python\Temp\Model02\Model02.gdb\Layers\Subwatershed', r'E:\Python\Temp\Model02\Model02.gdb\Layers\Centroid', r'E:\Python\Temp\Model02\Model02.gdb\Layers\LongestFlowPath_2D', r'E:\Python\Temp\Model02\Model02.gdb\Layers\CentroidalLongestFlowPath2') Runtime error  Traceback (most recent call last):   File "<string>", line 1, in <module>   File "C:\Program Files (x86)\ArcGIS\Desktop10.2\ArcToolbox\Scripts\GeoHMSTools.py", line 125, in CentroidalLongestFlowpath     raise e ExecuteError: System.Runtime.InteropServices.COMException (0x8002000A): Out of present range. (Exception from HRESULT: 0x8002000A (DISP_E_OVERFLOW))    at ESRI.ArcGIS.esriSystem.IStepProgressor.set_StepValue(Int32 Step)    at ESRI.APWR.HECGeoHMS10.GPCentroidalLongestFlowPath.CentroidalLongestFlowpathWk(ApLayers apLayers, Int32 debug, ITrackCancel& trackcancel, IGPMessages& messages, String& exMessage) Failed to execute (CentroidalLongestFlowpath). I have found that although the GeoHMSTools.CentroidalLongestFlowpath() failed, if I open the results window and open the failed script and rerun it, it completes successfully. ... View more

Hi Luke Thanks for the following. I copied the GeoHMSTools.py under the following directory: C:\Program Files (x86)\ArcGIS\Desktop10.2\ArcToolbox\Scripts I was then able to import GeoHMSTools within Python, but when I try to run any of the tools Python crashes and I recieve the following error message: GeoHMSTools.CentroidalLongestFlowpath(r'E:\Python\Temp\Model02\Model02.gdb\Layers\Subwatershed',r'E:\Python\Temp\Model02\Model02.gdb\Layers\Centroid' , r'E:\Python\Temp\Model02\Model02.gdb\Layers\LongestFlowPath_2D', r'E:\Python\Temp\Model02\Model02.gdb\Layers\CentroidalLongestFlowPath6') Runtime error  Traceback (most recent call last):   File "<string>", line 1, in <module>   File "c:\program files (x86)\arcgis\desktop10.2\ArcToolbox\Toolboxes\GeoHMSTools.py", line 113, in CentroidalLongestFlowpath ExecuteError: System.Runtime.InteropServices.COMException (0x8002000A): Out of present range. (Exception from HRESULT: 0x8002000A (DISP_E_OVERFLOW))    at ESRI.ArcGIS.esriSystem.IStepProgressor.set_StepValue(Int32 Step)    at ESRI.APWR.HECGeoHMS10.GPCentroidalLongestFlowPath.CentroidalLongestFlowpathWk(ApLayers apLayers, Int32 debug, ITrackCancel& trackcancel, IGPMessages& messages, String& exMessage) Failed to execute (CentroidalLongestFlowpath). ... View more