Latest Contributions by DorotheaKnigge

‎03-20-2017

Hi Dale, I find your process very intriguing. It seems the whole process hinges on having a very accurate centerline. Do you incorporate 'true curves' when editing? What is the suitable format for extracting curves? Thank you for any additional information. Dorothea

‎03-07-2017

Hello Steve, I appreciated your take on finding hairpin/sharp turns using speed limit information and road sign inventory. We have incorporated those aspects into our search. Thanking you for your input, Dorothea

‎01-30-2017

Anthony, Thank you for your comments, we do track "type" and "severity" among many other attributes. Using linear referencing we are also tracking by quarter mile segments which shows a different aspect on what's happening on the roads. I'm looking at all possible ways to identify dangerous curves that may need signage. That 'magic' script is not yet out there! Dorothea

‎01-23-2017

Good morning, Thank you Neil and Joe for your comments. Joe you are correct that the sinuosity of any line is defined along the way, not just the end points. I have not been happy with the "math" results. We do maintain our own accident data so I will take a look at where the 'hot spots' are occurring. Thank you for your re-direction and I wish you both a great day! Dorothea

‎01-20-2017

Hello, We would like to identify dangerous tight curves in our road database. To start I calculated a field called 'Sinuosity' with the following expression: "!Shape.Length! / (math.sqrt(math.pow((float( !Shape.FirstPoint.X!) - float( !Shape.LastPoint.X!)), 2) + math.pow((float( !Shape.FirstPoint.Y!) - float( !Shape.LastPoint.Y!)), 2)))" I then downloaded a geoprocessing script called 'Identify True Curves' which creates two output feature classes: OutputCurvePoints and OutputWithCurves It also creates two temp files: tmpSourceVertices and tmpDensifiedVertices I have successfully run the model but it is really not what I am looking to accomplish. Does anyone have a way to find these dangerous hairpin turns? I am using ArcInfo 10.1. Thank you, Dorothea

‎01-20-2017

Chris, I have re-run the geoprocessing script using our SDE binary version of our Road Database (SQLServer). It did not generate an empty output, so that is a good thing; but it didn't generate what I was hoping for either. I will follow up with Transportation sector for a different approach. Thank you for all your help and leading me through 'what makes a true curve'. I learned some things today. You must be getting a lot of rain in Roseville. I am also in the Mother Lode:) Dorothea

‎01-20-2017

That is helpful info, several years ago we moved the roads into an SDE binary format. Do you know if true curves are supported in the binary version?

‎01-20-2017

Thank you Chris, I did import the data from a shapefile. I will try exporting the data from our SDE geodatabase instead and see if that makes a difference.

‎01-20-2017

Hi Chris, I am using a file geodatabase not a shapefile. Do file geodatabases support true curves? I hadn't thought about that.

‎01-20-2017

Hello, We would like to identify dangerous tight curves in our road database. To start I calculated a field called 'Sinuosity' with the following expression: "!Shape.Length! / (math.sqrt(math.pow((float( !Shape.FirstPoint.X!) - float( !Shape.LastPoint.X!)), 2) + math.pow((float( !Shape.FirstPoint.Y!) - float( !Shape.LastPoint.Y!)), 2)))" I then downloaded a geoprocessing script called 'Identify True Curves' which creates two output feature classes: OutputCurvePoints and OutputWithCurves It also creates two temp files: tmpSourceVertices and tmpDensifiedVertices As the model runs, it gives me an error on both the OuputWithCurves and OutputCurvePoints . The error - 00117: Warning empty output generated. Am I missing something? I have made sure that the model paths are correct. I am using ArcInfo 10.1. I would much appreciate a work around or maybe even taking a different approach. Thank you, Dorothea

‎07-16-2015

Hello, I have used the JavaScript History API template to select parcel features using a value retrieved from the url. Everything is working well but I would like to be able to identify more of the layers in my ArcGIS Server service. Could someone show me how to revise the sample code to accomplish this? I am using ArcGIS 10.1 Thank you for any help or direction, Dorothea

‎11-05-2014

Just to let you know how blind I had become.....I just noticed that my 'End Date' prompt in each expression didn't have the '=' character after the '<' !!! With your 'white space' recommendation and the new '=' characters added, my application now works! Thank you for working with me, it was much appreciated. Dorothea

‎11-05-2014

Hi Robert, I added the white space but it still didn't work. I then removed the "operator="AND" in prompt="3" thinking it might make a difference but it still didn't work. I'll have to keep looking. I really appreciate your help with this.

‎11-05-2014

It stems from quite a few years back. We started to maintain a database of all collisions within the County by in-put from hard-copy reports from the CHP. We found our records were much more accurate than SWITERS data.

‎11-05-2014

You wouldn't have a method for using 'LONG' fields, would you? How would you go about making this work?

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My Ideas

Latest Contributions by DorotheaKnigge

Re: Identifying Dangerous Curves

Re: Identifying Dangerous Curves

Re: Identifying Dangerous Curves

Re: Identifying Dangerous Curves

Identifying Dangerous Curves

Re: help for Identifying true curves

Re: help for Identifying true curves

Re: help for Identifying true curves

Re: help for Identifying true curves

help for Identifying true curves

How to Identify more layers in Javascript's History API

Re: eSearch widget fails to display results, xml syntax error ?

Re: eSearch widget fails to display results, xml syntax error ?

Re: eSearch widget fails to display results, xml syntax error ?

Re: eSearch widget fails to display results, xml syntax error ?

Re: eSearch widget fails to display results, xml s...