Declination Diagram (Arrow) Tool

[JustinOdell]

Hi all,

I have downloaded the Declination Diagram toolbox for ArcGIS 10.2 and am having some difficulties with it's execution.

I follow the instructions provided and have copied the elements into my map.

When running the tool in my projected map (UTM z XX), it does calculate True North and a centroid for my map, however the tool calculates the Magnetic Declination Angle in Decimal Degrees as 'None', and hence it spits out the following:

Magnetic Declination Angle in Decimal Degrees = None

Annual Drift = None

Magnetic Declination Direction = W

Exception : int() argument must be a string or a number, not 'NoneType'

The tool fails to execute.

Can anybody offer any suggestions as to why the tool is calculating the magnetic declination angle as None?

[SepheFox]

Is your data also projected into UTM?

[JustinOdell]

Yes, all datasets have been projected to the right UTM zone.

[SepheFox]

Great! Just to be clear, this is not the tool from the Production Mapping Extension (ArcGIS Help (10.2, 10.2.1, and 10.2.2) ), but is this stand alone Python script: http://www.arcgis.com/home/item.html?id=dd664ce915214390b8cb8babb09a84bd? I'm just unsure, because you posted this in the Production Mapping subgroup, but then seemed to describe the script tool.

[JustinOdell]

Yes, that link relates to the tool I am using.

I posted in Production Mapping since the tool has been made by 'ProductionMappingTeam'

[SepheFox]

Just a thought: what geographic area is your data?

[JustinOdell]

Data is completely contained within UTM Zone 56 South.

[DanHopkins]

Hi Justin,

I encountered the same issue as you. I am running ArcGIS 10.2 for Desktop Build 3348 and Esri Production Mapping 10.2 Build 2714.

I have downloaded and installed Patch2 Build 3012 for Esri Production Mapping from the following link:

Mapping and Charting Solutions 10.2 Patch 2 | Samples and Utilities

I have downloaded and installed the World Magnetic Model (WMM) coefficient update 2015-2020 from the following link:

World Magnetic Model (WMM) coefficient update 2015-2020 | Samples and Utilities

The World Magnetic Model (WMM) coefficient update 2015-2020 should resolve your issue.

I deleted the contents of the CreateDeclinationDiagram.zip and unzipped the contents again and followed the instructions in the Getting Started with Create Declination Diagram Template.pdf. I launched ArcMap and opened a brand new Untitled.mxd. I added data. I changed the coordinate system of the data frame to UTM Zone 56 South. I saved the MXD. I then copied the Declination Diagram from the CreateDeclinationDiagramTemplate.mxd to my new saved MXD. I ran the Create Declination Diagram script tool and it completed and generated a declination diagram without error.

If you still run into errors, you can contact Esri Technical Support at the following link:

Contact Tech Support

If you do contact support and create a support case, please request that the case be routed to me.

Good luck.

Regards,

Dan

[JustinOdell]

Thanks Dan,

This is particularly helpful.

I have installed the Patch, as well as the World Magnetic Model coefficient update.

I followed the steps exactly as you outlined, but still no luck...

[DanHopkins]

Hi Justin,

Thank you for your response. Can you please delete the DeclinationDiagram toolbox from ArcToolbox and re-add it using the instructions in the Getting Started with Create Declination Diagram Template.pdf.

What happens?

Regards,

Dan