Latest Contributions by PeterWilson

I'd like to find out from the ESRI\HEC community if anyone has experience in automatically (Python\Geoprocessing) identifying the river bank positions from the cross-sections. I found that delineating the bank lines is not necessarily the best method for determining the bank positions, especially in very flat river channels. If one could estimate the bank positions by looking at slope change within the cross-sections and identify the left and right bank position based on slope change and create a point at this position would greatly improve the bank lines positioning. Any advice or knowledge of possible scripts that could be used to determine the banks positions would greatly reduce the amount of time in having to alter these manually once importing the HEC-GeoRAS Geometry file into HEC-RAS. Regards ... View more

We are currently busy with a project that requires us to determine the optimal location for cell towers based on a 400m and 800m radius and cell mast height of 20m. I'm looking for advice and any sample workflows by using 3D Analyst Viewshed Analysis to optimally identify the location for cell towers to cover a study area with allowance of 10% overlap. I don't want to have to manually plot cell tower locations and then to perform the viewshed analysis. I've attached a image of our study area. Thanks in advance for any assistance that can be offered by the community. Regards Peter Wilson ... View more

I'm new to python and and arcpy and would like to get some advice in generating a python script. I have a table with the following fields: Field 01:  Quinary (txt) Field 02:  Water Management Area (txt) Field 03:  Percentage (Double) The table represents the results based on the intersection of the quinary (polygon) feature class that was intersected with the Water Management Area (polygon) feature class. The Percentage Field represents the percentage area of the original Quinary Feature Class that falls within the Water Management Area. The table has multiple records where Field 01 can have the same value, Field 02 can have the same value but Field 03 will be different. I need to identify the records based on Field 01 and Field 02 and identify the maximum value in Field 03. ID  Field 01    Field 02    Field 03 01  Q1           W1          02.00 02  Q1           W1          48.00 03  Q1           W2          50.00 04  Q2           W3          90.00 05  Q2           W4          10.00 Results Reqiured: ID  Field 01    Field 02    Field 03 03  Q1           W2          50.00 04  Q2           W3          90.00 Any help will be appreciated. Regards ... View more

I need some assistance in getting started with the following python script, that I would like to insert into a model (ModelBuilder) that I'm currently buidling. I???ve got a table that I???ve generated from summary statistics and within the table I???ve got a field called MAPSHEET, the values within the field MAPSHEET represent the names of the indexes that I need to use to select features classes from a geodatabase (contours (polyline feature classes) and spot height (point feature classes)). The contours feature classes have a prefix RE and the spot heights feature classes have a prefix PNT. I need to use the value within the field MAPSHEET and select the feature classes from the geodatabase that match the same index for the contours and spot height and pass them to Topo To Raster as input feature classes. Also I need to iterate through all the values within the MAPSHEET field and select all the feature classes from the geodatabase and add all the contours and spot heights representing the list of indexes to Topo To Raster, before its run. Any assistance would be appreciated. Regards ... View more

I've got 563 photos that have been taken as part of a survey. I've also got a GPS location for each Photograph that has been taken. Jake Skinner from ESRI provided me with a starting point: http://forums.arcgis.com/threads/97398-Python-Insert-Photographs-into-ArcMap-Data-View-Programattically?p=346989#post346989 What I would like to do is rather specify the width and height, instead of using the current data frame extent. So I'm looking for a way to generate a polygon around each point feature that represents the location of the photographs, based on a specified height and width. Regards ... View more

I've installed HEC-GeoHMS onto a virtual machine as well as Arc Hydro 64 bit. As soon as I change the Temporary Directory location from the C drive to a network drive, Arc Hydro fails saying it cant read from the new location, yet it has just written temporary files to the new location. Is there anyway to resolve this. I need to move the temporary location as the temporary files grow enormously and my C drive runs out of space. Please see the attached error reported when trying to run Arc Hydro. Regards ... View more

I have hundreds of photographs that have been taken as part of a survey. I've created point features that represent the location of each photograph as well as added a field to the point features with the full path to the photographs. I'd like to insert the photographs into the data view of ArcMap, specify the width and height to display the photograph and have them centered at the point feature associated  with the photograph. I wouldn't like to do this manually as there are a couple hundred photographs. The photographs need to be inserted not hyperlinked as I need to print the various sections of the surveyed area and display the photographs on the printed map. Regards ... View more

I have delineated a river centreline and interpolated the Z values from a DEM (SRTM 90m) to generate a 3D polyline that represents the river centreline. I have then adjusted the Z values within the 3D river centreline and increased it by 20m and 40m respectively. I've tried to use Visibility Analysis tool to try to generate the floodplain, but the results aren't great even after adjusting the vertical, horizontal and radius parameters. Any alternative would appreciated. So as explained, I'm trying to delineate the expected inundated surface areas coarsely from the river centreline, based on an adjusted Z value, then trying to determine the horizontal impact area of the DEM that is covered by water. Regards ... View more