topic Re: ArcCN runoff script unit conversion in GIS for Hydrographic Surveying Questions

ArcCN runoff script unit conversion

MERVEOZEREN — Sun, 17 Jan 2016 23:03:04 GMT

Hello!

I have a question on unit conversion while using ArcCN runoff script. I am using metric measurements. My area data for landuse and soil maps are in squaremeters. Precipitation data is in mm. In original artical writers use inches for precipitation data but they have squaremeter unit for area data as I understood. Should I enter inches parameter for precipitation value or can I use mm parameter as I wanted to take runoff volume result in cubicmeters?

Any ideas there?

Thanks anyway.

Re: ArcCN runoff script unit conversion

DanPatterson_Retired — Mon, 18 Jan 2016 01:00:27 GMT

Can you provide the reference article snippets? What units did they produce runoff in? I am sure that there is a standardization/conversion at some stage. I would examine the script to confirm. (a link would be nice, if you have it)

Re: ArcCN runoff script unit conversion

MERVEOZEREN — Mon, 18 Jan 2016 07:32:01 GMT

Thank you for your interest sir!

Here is the link for the script. The file contains datas also.

http://arcscripts.esri.com/details.asp?dbid=13311

And here is the original article by creators of the script:

ArcCN-Runoff: an ArcGIS tool for generating curve number and runoff maps

Actually this is the point, I couldn't be able to understood what units did they produce runoff in...Rrunoff volume is asked to be calculated in cubicmeters (as I needed). Area data is in squaremeters (may be I was wrong) but precipitation is in inches.

To be sure I check the results; I look at the statistics for runoff volume column and area column. Division of total runoff volume value by total area value should give total runoff value (in m. or in mm.) as I know but it doesn't.

I would appreciate if you could tell me where I am mistaking.

Re: ArcCN runoff script unit conversion

DanPatterson_Retired — Mon, 18 Jan 2016 07:55:13 GMT

The first link doesn't work on my machine and I don't have access to Science Direct from home, so help will have to wait until later. sorry

Re: ArcCN runoff script unit conversion

MERVEOZEREN — Mon, 18 Jan 2016 09:13:37 GMT

Upps! I didn't know that I can attach files in this platform. Here they are attached Mr. Patterson, Original file and paper.

Re: ArcCN runoff script unit conversion

DanPatterson_Retired — Mon, 18 Jan 2016 11:48:19 GMT

Well the dialog says it all, you get to specify the input parameters whether in inches or not and the field that contains the area will depend on your area field, then the output you can specify metric or not. Have a re look at the dialog

Re: ArcCN runoff script unit conversion

MERVEOZEREN — Mon, 18 Jan 2016 12:33:30 GMT

Yes yes the dialog box seems so simple. What I see is attached. But sir, if the unit doesn't matter, how the result differs when I put P parameter in inches or in milimeters? And when I check the result and divide total runoff volume by total area, the result - I mean total runoff depth value -doesn't match with the auto-calculated value?

Re: ArcCN runoff script unit conversion

DanPatterson_Retired — Mon, 18 Jan 2016 15:30:52 GMT

The units will matter since you provide them...for example your area field will control the denominator of the calculation

Re: ArcCN runoff script unit conversion

MERVEOZEREN — Mon, 18 Jan 2016 15:53:13 GMT

I see now. Thank you for your time and comments!

18 Oca 2016 17:31 tarihinde "Dan Patterson" <geonet@esri.com> yazdı:

GeoNet <https://community.esri.com/?et=watches.email.thread>
ArcCN runoff script unit conversion
reply from Dan Patterson
<https://community.esri.com/people/Dan_Patterson?et=watches.email.thread> in *GIS
for Hydrographic Surveying* - View the full discussion
<https://community.esri.com/message/581249?et=watches.email.thread#581249>

Re: ArcCN runoff script unit conversion

José_Luisdel_Río — Thu, 21 Jan 2016 18:27:30 GMT

Dear user Merve Ozeren:

My name is José Luis, I am a pre-PhD researcher in Spain who is very interested in applying ArcCN-Runoff to some watersheds but the model only works in ArcGIS 8.3 and 9.0, as you probably know. As I can see in the screenshot you attached to this comment, it seems that you are using such model in a newer version, perhaps through ArcGIS 10.1 or 10.2?. If I am right, could you please explain me how did you get to implement the model through a recent version of ArcGIS? By encrypting the model codes in Python perhaps? I am currently using ArcGIS 9.3.1 but I have access to ArcGIS 10.1 as well.

Thank you in advance for your time.

Best regards.

Re: ArcCN runoff script unit conversion

MERVEOZEREN — Thu, 21 Jan 2016 20:43:30 GMT

Mr. José Luis hello back!

I also read that the model works in ArcGIS 8.3 and 9.0 but I desperately needed this script so I decided to try to load it inspite of having a 10.3.1. version of ArcGIS. I had no idea about how to do it because I am pretty new to GIS world so I found this video on youtube:

https://www.youtube.com/watch?v=EVPzPGW7qVo, Add DLL to ArcMap - YouTube https://www.youtube.com/watch?v=EVPzPGW7qVo

Followed the procedure and it worked.

Sorry, I have no knowledge about coding with Phyton...

Actually, I also have a question; does the interface of ArcCN Runoff look the same in your version of ArcGIS? Does Precipitation box have a unit statement as it has in original article? Because as I understand something is wrong with my results.

Best regards.

Re: ArcCN runoff script unit conversion

José_Luisdel_Río — Fri, 22 Jan 2016 08:39:11 GMT

Hello Mr. MERVE:

Thanks for your prompt response. I have seen the video-tutorial but I am not quite sure if it will work in ArcGIS 9.3.1, I tried something similar and it did not. In any case, I'll try again!

Concerning the question you asked, I was not able to integrate that panel into ArcGIS, in fact that is what I am trying to solve at first instance. As soon as I achieve it, I'll provide you feedback.

Bests,

Re: ArcCN runoff script unit conversion

José_Luisdel_Río — Fri, 22 Jan 2016 09:27:12 GMT

Hello again!

I finally achieved the integration of the interface into ArcGIS 10.2 but, as you experienced, some words and sentences look incomplete. I suppose this inconvenient is related to the version of the model, I mean that ArcGIS 10 is able to read the .dll file but it does not show all commands correctly. In any case, by analising the original paper and comparing the information with what I can see in the interface I understand that precipitation must be implemented in "inches" as a number, as it has been indicated by the author.

Hope this helps!

Re: ArcCN runoff script unit conversion

MERVEOZEREN — Sat, 23 Apr 2016 13:10:30 GMT

Hello Mr. José Luis,

It's been a while, forgive me pls. Yes, you are totally right. I inverted the value into mm later on and the problem's been solved. Anyway, I have to implement slope factor to the original formula, so this script is not useful anymore.

Thank you again for your comment...