Latest Contributions by PeterWilson

I'm using the following steps to identify possible structures required along a new Railway Alignment using ArcHydro and GIS ModelBuilder: 1: Convert CAD Pre Alignment polyline into a feature class Polyline 2: Convert the feature class polyline into a raster grid using my ArcHydro FAC grid as my snap grid and setting the cell size to be the same 3: convert my raster alignment grid into a point feature class 4: Using interpolate to shape under 3D Analyst extract the FAC values for each point location 5: Filter out the points by removing points that have a FAC value of 52 and less. I'm looking to further filter the points by removing points that are along the same flow path against the rail alignment but not necessarily the lowest point along the flow path. Any suggestions are welcome. Thanks.... ... View more

I'm looking for assistance from the ESRI community to write a python script that will calculate the Centroidal Flow Path of based on the Longest Flow Paths and Drainage Area Centroid. I need to project a line at right angles to the Longest Flow Path split the Longest Flow Paths, remove the segment upstream of the Drainage Area Centroid and report the remaining segments as the Centroidal Flow Paths for each Watershed. I've attached a image to better explain what I'm trying to accomplish. The reason for wanting to script this is that I would like to embed this into my current ArcGIS Model that I've developed using ModelBuilder. Regards ... View more

I'm looking for assistance from the ESRI community to write a python script that will calculate the Centroidal Flow Path of based on the Longest Flow Paths and Drainage Area Centroid. I need to project a line at right angles to the Longest Flow Path split the Longest Flow Paths, remove the segment upstream of the Drainage Area Centroid and report the remaining segments as the Centroidal Flow Paths for each Watershed. I've attached a image to better explain what I'm trying to accomplish. The reason for wanting to script this is that I would like to embed this into my current ArcGIS Model that I've developed using ModelBuilder. Regards ... View more

I'm looking for assistance from the ESRI community to write a python script that will calculate the Centroidal Flow Path of  based on the Longest Flow Paths and Drainage Area Centroid. I need to project a line at right angles to the Longest Flow Path split the Longest Flow Paths, remove the segment upstream of the Drainage Area Centroid and report the remaining segments as the Centroidal Flow Paths for each Watershed. I've attached a image to better explain what I'm trying to accomplish. The reason for wanting to script this is that I would like to embed this into my current ArcGIS Model that I've developed using ModelBuilder. Regards ... View more

I've just started to use ArcGIS Diagramer: Is there a way to re-arrange the order of fields once added? Surely one doesn't no the exact order the first time you start designing a geodatabase. This should surely be a simple procedure by selecting a field name and being able to drag it to a new position. Any advice would be appreciated. Regards ... View more

I've been calculating the length to centroid as part of determining catachment characteristics manually as long as I can remember. I recently found out that HEC-GEoHMS is capable of calculating length to centroid using Basin Characteristics\Centroidal Longest Flow Path. I'm looking for a way to accomplish the same using my results generated from Arc Hydro and a python script to automate the generation of the Centroidal Longest Flow Paths. Any assistance in being able to accomplish the following will be appreciated. Regards ... View more

Firstly, please note that I'm new to programming and Python. I've created the following Python script to loop through a directory, validate the shapefile names that I then copy to a specified File Geodatabase. The are some shapefiles that have that already have "_shp" attached the shapefile name and the "ValidateTableName" adds "_shp" to the output Feature Class. I have striped out "_shp" before copy the shapefile to the Geodatabase. I have noticed that where the shapefile already had "_shp" it drops an additional character at the end. How to i prevent this from happenning. i.e. citiespop_shp.shp = citispo import arcpy, os ... arcpy.env.workspace = r"S:\Projects\H108392\H108392.gdb" ... arcpy.env.OverwriteOutput = True ... inWksp = r"S:\Projects\H108392\data_received\KageraMonograph\KAGERA_GIS\_Vector_Data" ... for root, dirs, files in os.walk(inWksp): ...     for name in files: ...         if name.endswith(".shp"): ...             path = os.path.abspath(os.path.join(root, name)) ...             base = arcpy.ValidateTableName(os.path.basename(path)) ...             print "Processing "+base ...             arcpy.CopyFeatures_management(path, "S:/Projects/H108392/H108392.gdb/"+base.rstrip("_shp")) Any advice would be appreciated and as well as any pointers wher I could improve the structure of my code. Regards ... View more

I have a delema in either my geodatabase design or otherwise can't understand why it's not possible to autocomplete between two separate feature classes. I'm currently building a landuse geodatabase where we are digitising "Crop Field" boundaries and "Farm Dam" boundaries. If I store the Feature Classes separately you can't use autocomplete within an Edit Session between the two feature classes. I need to maintain different attributes for each feature class such as "Crop Type" for the "Crop Fields", which of course makes no sense in relation to "Farm Dams" which would mean I would have numerous "<Null>" values within my attribute table. I currently have to have the two feature types stored within a single feature class in order to use autocomplete as they share boundaries or a "Farm Dam: is surrounded by a "Crop Field". Have I missed something or is this a bug within ArcGIS? Regards ... View more

I have a delema in either my geodatabase design or otherwise can't understand why it's not possible to autocomplete between two separate feature classes. I'm currently building a landuse geodatabase where we are digitising "Crop Field" boundaries and "Farm Dam" boundaries. If I store the Feature Classes separately you can't use autocomplete within an Edit Session between the two feature classes. I need to maintain different attributes for each feature class such as "Crop Type" for the "Crop Fields", which of course makes no sense in relation to "Farm Dams" which would mean I would have numerous "<Null>" values within my attribute table. I currently have to have the two feature types stored within a single feature class in order to use autocomplete as they share boundaries or a "Farm Dam: is surrounded by a "Crop Field". Have I missed something or is this a bug within ArcGIS? Regards ... View more

I have a delema in either my geodatabase design or otherwise can't understand why it's not possible to autocomplete between two separate feature classes. I'm currently building a landuse geodatabase where we are digitising "Crop Field" boundaries and "Farm Dam" boundaries. If I store the Feature Classes separately you can't use autocomplete within an Edit Session between the two feature classes. I need to maintain different attributes for each feature class such as "Crop Type" for the "Crop Fields", which of course makes no sense in relation to "Farm Dams" which would mean I would have numerous "<Null>" values within my attribute table. I currently have to have the two feature types stored within a single feature class in order to use autocomplete as they share boundaries or a "Farm Dam: is surrounded by a "Crop Field". Have I missed something or is this a bug within ArcGIS? Regards ... View more