[Qgis-user] Labeling Lines with Bearings

[Springfield Harrison]

Hello Everyone,

Thanks very much for the suggestions.  The main_angle option seem to do 
the trick.

I didn't try the Python code.  Not familiar with that side of things 
although it is probably simple enough.  Could not find the recipe for 
adding it to the plug-in list, which I presume is where it is supposed 
to go.

Thanks again, very helpful…

--------
Cheers, Spring



On 04/Feb/2022 07:10, Kirk Schmidt wrote:
>
> Hi Springfield:
>
>
> Sure it would , I have attached my little convergence tool. Just 
> create a point in the area where you want to know the convergence at 
> let her rip.  The vary last column is the convergence in minutes.  So, 
> depending on what side of the central meridian of your coordinate 
> system you are, it will either be negative or positive. SO, I just 
> used it yesterday for and area that is east of the meridian, UTM 
> easting > 500,000,   therefore the resulting convergence was 22 
> minutes, which need to be subtracted from the grid north value to 
> obtain true north.  It is not a sophisticated workflow, but I only 
> require it intermittently.
>
> I usually use NRCAN magnetic declination calculator (online) to verify 
> the magnetic declination for the day.  But it seems to be offline. I 
> convert everything to magnetic for field work and then there are no 
> mistakes due to declination calculations and settings.
>
> Have fun
>
> Kirk
>
> On 2/4/2022 6:34 AM, Springfield Harrison wrote:
>>
>> Aha, thanks Kirk.  That's why my lines are not as I intended.  This 
>> probably affects making the lines with the Shape Tool.
>>
>> Yes, it seems to draw in grid north, angle_main reports in True DD.  
>> The map is 26907, UTM 7N.
>>
>> I calculated the difference between as drawn and as reported and used 
>> that to change the input figure.  It works OK, not exact as the 
>> convergence varies with longitude, I believe.
>>
>> Thanks Kirk . . . .
>>
>> --------
>> Cheers, Spring
>> On 03/Feb/2022 02:59, kirk wrote:
>>>
>>>
>>>
>>>
>>> Sent from my Galaxy
>>>
>>>
>>> -------- Original message --------
>>> From: kirk <kirk at nortekresources.com>
>>> Date: 2022-02-03 5:55 a.m. (GMT-04:00)
>>> To: Springfield Harrison <stellargps at gmail.com>, 
>>> qgis-user at lists.osgeo.org
>>> Subject: RE: [Qgis-user] Labeling Lines with Bearings
>>>
>>> Hi Spingfield.
>>>
>>> I use a little routine and the core if it is:
>>>
>>> main_angle($geometry) which you can use in field calculator.
>>>
>>> Note this will give you the azimuth in relation to grid north for 
>>> the coordinate system you are using.  For projections, you will need 
>>> to lookup or calculate convergence to get the adjustment to true north.
>>>
>>> Kirk Schmidt
>>>
>>>
>>>
>>> Sent from my Galaxy
>>>
>>>
>>> -------- Original message --------
>>> From: Springfield Harrison <stellargps at gmail.com>
>>> Date: 2022-02-02 7:30 p.m. (GMT-04:00)
>>> To: qgis-user at lists.osgeo.org
>>> Subject: [Qgis-user] Labeling Lines with Bearings
>>>
>>> Hello,
>>>
>>> I need to put the line direction (azimuth) into a line label. Some
>>> searching has not come up with anything.
>>>
>>> Is there a way?  Thanks very much . . . .
>>>
>>> --------
>>> Cheers, Spring
>>>
>>>
>>>
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> -- 
> Kirk Schmidt, MScF, BScF, RPF
> General Manager
> Nortek Resource Solutions Inc.
> 26 Church Road
> Sutherlands River, NS
> B0K 1W0
> Tel (902) 922.3607
> Email:kirk at nortekresources.com
> Web:www.nortekresources.com
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