Re: [Qgis-user] True North

[Springfield Harrison]

hello Kristian,

Thanks again for your help, I was partially successful. The second grid,
the custom Mercator one that you described is not happy in the print
composer. It does not persist but seems to revert back to the UTM grid with
the word change on the CRS button.

Not sure what that is all about but my main requirement is to be able to
draw lines at specific angles with reference to true north. They will then
be re -projected correctly based on the display projection. Unfortunately,
the advanced digitizing tool does not work with Geographic projections, IE
un projected Maps.

If I can get lines that are guaranteed to be related to Geographic
bearings, I could let the projection quirks sort themselves out on their
own.

If you have any thoughts on this I would be most appreciative...

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 4, 2018 9:41 AM, "Springfield Harrison"  wrote:

> Okay, great. That is very helpful, I will work in the map composer. I know
> what you are referring to there. Thanks again...
>
> Cheers . . . . .   Spring
> Samsung Tab 4
> On Apr 4, 2018 9:36 AM, "Kristian Evers"  wrote:
>
>> I made it within the Layout Composer/Editor (what it’s called in QGIS3
>> escapes me now – it used to be Map Composer in 2.x). That was the simplest
>> way to achieve it quickly I found. You have the possibility to add more
>> than one graticule and you can also change the CRS of the graticule. That
>> is what I did. One was kept in UTM, the other used my custom Mercator CRS.
>>
>>
>>
>> This is just one way of doing it. There many ways to achieve the same
>> thing, but this should outline the general idea at least.
>>
>>
>>
>> My last post was not let through to the mailing list, so here’s a copy of
>> the image I attached in the previous mail. Should anyone be interested…
>>
>>
>>
>> /Kristian
>>
>>
>>
>>
>>
>> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
>> *Sendt:* 4. april 2018 16:19
>> *Til:* Kristian Evers 
>> *Cc:* qgis-user 
>> *Emne:* Re: SV: [Qgis-user] True North
>>
>>
>>
>> Right, this looks promising.
>>
>> I have been changing projections and then enabling the grid decoration
>> which is always oriented straight up regardless of the projection.
>>
>> I assume that you were inserting your grids as a vector feature using a
>> drawing tool?
>>
>> What was the CRS of the grid layer? I have been changing the project
>> projection with OTF on. Maybe I should be adjusting the projection of the
>> layer in question?
>>
>> Thanks again . . .
>>
>> Cheers . . . . .   Spring
>> Samsung Tab 4
>>
>> On Apr 4, 2018 5:23 AM, "Kristian Evers"  wrote:
>>
>> I had a quick go at it after I wrote the email. What I did was to first
>> create a custom projection with the proj-string “+proj=merc”. Then I opened
>> the layout editor, inserted my map and added to sets of grid lines to the
>> map. One of them was left with the original CRS (the UTM one) and for the
>> other I used my custom CRS. This immediately gave me two grids, one where
>> the meridians is oriented at the grid north (black in the attached image)
>> and one oriented at true north (red in the attached image).
>>
>>
>>
>> /Kristian
>>
>>
>>
>> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
>> *Sendt:* 3. april 2018 22:52
>> *Til:* qgis-user@lists.osgeo.org; Kristian Evers 
>> *Emne:* Re: [Qgis-user] True North
>>
>>
>>
>> OK, that sounds like the solution I'm looking for.
>>
>> It sounds like the answer is to draw the lines in one projection and then
>> transform it to the other, depending upon which orientation is desired for
>> those lines.
>>
>> I hope I have this correct…
>>
>> Cheers . . . . . Springfield Harrison
>>
>>
>>
>> On 03-Apr-2018 02:46, Kristian Evers wrote:
>>
>> You can use the Mercator projection to digitize true north lines. It is
>> conformal and thus preserves angles. The meridian convergence is 0 (that
>> is, true north == grid north) all over the map. If you then transform those
>> lines to your chosen CRS you should have a set of lines pointing towards
>> true north instead of grid north.
>>
>>
>>
>> /Kristian
>>
>>
>>
>> *Fra:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org
>> ] *På vegne af *Alexandre Neto
>> *Sendt:* 3. april 2018 11:15
>> *Til:* Springfield Harrison  
>> *Cc:* qgis-user  
>> *Emne:* Re: [Qgis-user] True North
>>
>>
>>
>> Maybe something like this :
>>
>>
>>
>> https://gis.stackexchange.com/q/115531/6191
>>
>>
>>
>> Alexandre
>>
>> A ter, 3/04/2018, 10:11, Alexandre Neto  escreveu:
>>
>> Ah sorry,
>>
>>
>>
>> I got lost in translation. You are right, I was talking about the
>> magnetic north, not the geodetic one.
>>
>>
>>
>> Meanwhile,  remembering that all UTM are Transverse Mercator, I don't
>> think there's 

[Qgis-user] QGIS3: limit palette for XYZ, WMS/WMTS?

[Tobias Wendorff]

Hi there,

is it possible to limit the palette for imagery from XYZ, WMTS/WMS?
For example, I would like to show elements with rgb(255,0,0) only.

A work-around might be to use MapProxy and run some PIL magic on it...

Best regards,
Tobias

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Re: [Qgis-user] QGIS3: zoom in fixed XYZ steps?

[Tobias Wendorff]

Am Mo, 2.04.2018, 10:51 schrieb Richard Duivenvoorde:
> On 02-04-18 00:23, Tobias Wendorff wrote:
> Yes, there is a panel 'Tile Scale' which is working for WMST,
> and to me also looks to work for xyz layers:

[x] works for me with XYZ, too - thanks a lot!
"Tile Scale" panel is missing labels, is this a bug?

> I wrote something about it some years ago, to adapt those scales
> to our national WMTS scales (which is a DIFFERENT schema then
> the Google/World schema the xyz layers use!) [0]

Yeah, I used gdalinfo and some python code to do this in the past
(I also wanted sharp tiles).

> Would be nice to maybe create a 'layer tree widget' [1][2] for
> these xyz layers?

Definitely, would be useful.

Thanks again ;)

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Re: [Qgis-user] Help in Field Calculator

[Daniel Alejandro Montecinos Rubilar]

I can’t find a solution to my problem, could someone help me?

 

De: Andreas Neumann 
Fecha: miércoles, 4 de abril de 2018, 10:52
Para: Daniel Alejandro Montecinos Rubilar 
CC: 
Asunto: Re: [Qgis-user] Help in Field Calculator

 

Hi Daniel,

One alternative way to do this, without field calculator, is to use the 
"Processing Toolbox" (see menu processing) and use the "Count opints in polygon 
(weighted)" algorithm. This should do what you want, but the downside to this 
approach is that you end up with a new layer.

If you want to use the field calculator (without creating a new layer) you will 
have to look at aggregates and spatial relationship functions. I am not 100% 
sure if this would work - I currently don't have the time to test it - but 
might be worth a try.

Good luck!

Andreas

On 2018-04-04 14:27, Daniel Alejandro Montecinos Rubilar wrote:

Hi. I have a question urgent. What I try to do is then updated columns in a 
data layer with another layer. For example , I have two layers A = Poligono , B 
= Points . The layer B contains real values. Then would do two things. 1. Count 
how many points of the layers B are within the layer A. 2. From the points of 
the layer B that are within the polygon layer A, I need the sum of their values 
​​and paste this sum in a column of created layer A. I tried to make the 
crossing with the "field calculator" function, using the functions: 
"geomwithim", "geomintersects" and "intersecting_geom_sum", but without results.

 

I hope I have been able to explain.

 

Greetings and thanks for your support.

 

 

 

 

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Re: [Qgis-user] True North

[Kristian Evers]

And the image… https://imgur.com/a/l8Zpq

Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Kristian 
Evers
Sendt: 4. april 2018 16:37
Til: qgis-user@lists.osgeo.org
Emne: Re: [Qgis-user] True North

I made it within the Layout Composer/Editor (what it’s called in QGIS3 escapes 
me now – it used to be Map Composer in 2.x). That was the simplest way to 
achieve it quickly I found. You have the possibility to add more than one 
graticule and you can also change the CRS of the graticule. That is what I did. 
One was kept in UTM, the other used my custom Mercator CRS.

This is just one way of doing it. There many ways to achieve the same thing, 
but this should outline the general idea at least.

My last post was not let through to the mailing list, so here’s a copy of the 
image I attached in the previous mail. Should anyone be interested…

/Kristian


Fra: Springfield Harrison [mailto:stellar...@gmail.com]
Sendt: 4. april 2018 16:19
Til: Kristian Evers >
Cc: qgis-user >
Emne: Re: SV: [Qgis-user] True North


Right, this looks promising.

I have been changing projections and then enabling the grid decoration which is 
always oriented straight up regardless of the projection.

I assume that you were inserting your grids as a vector feature using a drawing 
tool?

What was the CRS of the grid layer? I have been changing the project projection 
with OTF on. Maybe I should be adjusting the projection of the layer in 
question?

Thanks again . . .

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 4, 2018 5:23 AM, "Kristian Evers" > 
wrote:
I had a quick go at it after I wrote the email. What I did was to first create 
a custom projection with the proj-string “+proj=merc”. Then I opened the layout 
editor, inserted my map and added to sets of grid lines to the map. One of them 
was left with the original CRS (the UTM one) and for the other I used my custom 
CRS. This immediately gave me two grids, one where the meridians is oriented at 
the grid north (black in the attached image) and one oriented at true north 
(red in the attached image).

/Kristian

Fra: Springfield Harrison 
[mailto:stellar...@gmail.com]
Sendt: 3. april 2018 22:52
Til: qgis-user@lists.osgeo.org; Kristian 
Evers >
Emne: Re: [Qgis-user] True North

OK, that sounds like the solution I'm looking for.

It sounds like the answer is to draw the lines in one projection and then 
transform it to the other, depending upon which orientation is desired for 
those lines.

I hope I have this correct…
Cheers . . . . . Springfield Harrison


On 03-Apr-2018 02:46, Kristian Evers wrote:
You can use the Mercator projection to digitize true north lines. It is 
conformal and thus preserves angles. The meridian convergence is 0 (that is, 
true north == grid north) all over the map. If you then transform those lines 
to your chosen CRS you should have a set of lines pointing towards true north 
instead of grid north.

/Kristian

Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Alexandre 
Neto
Sendt: 3. april 2018 11:15
Til: Springfield Harrison 
Cc: qgis-user 
Emne: Re: [Qgis-user] True North

Maybe something like this :

https://gis.stackexchange.com/q/115531/6191

Alexandre
A ter, 3/04/2018, 10:11, Alexandre Neto 
> escreveu:
Ah sorry,

I got lost in translation. You are right, I was talking about the magnetic 
north, not the geodetic one.

Meanwhile,  remembering that all UTM are Transverse Mercator, I don't think 
there's a CRS that will solve you question.

I think you need to use some formula to convert the grid north measures to true 
north according to the CRS, and the latitude and longitude of the place.

Alexandre

A ter, 3/04/2018, 09:25, Springfield Harrison 
> escreveu:

Alexandre,

I believe that true north is actually a constant oriented towards the North 
Pole, i e 90 degrees north latitude. Also where all meridians converge in the 
northern hemisphere.

The other North orientations are magnetic north and grid North and these do 
vary as you suggested.

I do need to use a UTM projection but need bearings to be in degrees true north.

Thanks Alexandre...

Cheers . . . . .   Spring

Samsung Tab 4
On Apr 2, 2018 4:27 PM, "Alexandre Neto" 
> wrote:
AFAIK, true bearing differs in time and location because of magnetic 
declination. So I don't think there is a such thing as a CRS with true bearings.

Assuming you are working at regional level, find the magnetic declination for 
that region and remove it from your observations. Then 

Re: [Qgis-user] True North

[Springfield Harrison]

Okay, great. That is very helpful, I will work in the map composer. I know
what you are referring to there. Thanks again...

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 4, 2018 9:36 AM, "Kristian Evers"  wrote:

> I made it within the Layout Composer/Editor (what it’s called in QGIS3
> escapes me now – it used to be Map Composer in 2.x). That was the simplest
> way to achieve it quickly I found. You have the possibility to add more
> than one graticule and you can also change the CRS of the graticule. That
> is what I did. One was kept in UTM, the other used my custom Mercator CRS.
>
>
>
> This is just one way of doing it. There many ways to achieve the same
> thing, but this should outline the general idea at least.
>
>
>
> My last post was not let through to the mailing list, so here’s a copy of
> the image I attached in the previous mail. Should anyone be interested…
>
>
>
> /Kristian
>
>
>
>
>
> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
> *Sendt:* 4. april 2018 16:19
> *Til:* Kristian Evers 
> *Cc:* qgis-user 
> *Emne:* Re: SV: [Qgis-user] True North
>
>
>
> Right, this looks promising.
>
> I have been changing projections and then enabling the grid decoration
> which is always oriented straight up regardless of the projection.
>
> I assume that you were inserting your grids as a vector feature using a
> drawing tool?
>
> What was the CRS of the grid layer? I have been changing the project
> projection with OTF on. Maybe I should be adjusting the projection of the
> layer in question?
>
> Thanks again . . .
>
> Cheers . . . . .   Spring
> Samsung Tab 4
>
> On Apr 4, 2018 5:23 AM, "Kristian Evers"  wrote:
>
> I had a quick go at it after I wrote the email. What I did was to first
> create a custom projection with the proj-string “+proj=merc”. Then I opened
> the layout editor, inserted my map and added to sets of grid lines to the
> map. One of them was left with the original CRS (the UTM one) and for the
> other I used my custom CRS. This immediately gave me two grids, one where
> the meridians is oriented at the grid north (black in the attached image)
> and one oriented at true north (red in the attached image).
>
>
>
> /Kristian
>
>
>
> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
> *Sendt:* 3. april 2018 22:52
> *Til:* qgis-user@lists.osgeo.org; Kristian Evers 
> *Emne:* Re: [Qgis-user] True North
>
>
>
> OK, that sounds like the solution I'm looking for.
>
> It sounds like the answer is to draw the lines in one projection and then
> transform it to the other, depending upon which orientation is desired for
> those lines.
>
> I hope I have this correct…
>
> Cheers . . . . . Springfield Harrison
>
>
>
> On 03-Apr-2018 02:46, Kristian Evers wrote:
>
> You can use the Mercator projection to digitize true north lines. It is
> conformal and thus preserves angles. The meridian convergence is 0 (that
> is, true north == grid north) all over the map. If you then transform those
> lines to your chosen CRS you should have a set of lines pointing towards
> true north instead of grid north.
>
>
>
> /Kristian
>
>
>
> *Fra:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org
> ] *På vegne af *Alexandre Neto
> *Sendt:* 3. april 2018 11:15
> *Til:* Springfield Harrison  
> *Cc:* qgis-user  
> *Emne:* Re: [Qgis-user] True North
>
>
>
> Maybe something like this :
>
>
>
> https://gis.stackexchange.com/q/115531/6191
>
>
>
> Alexandre
>
> A ter, 3/04/2018, 10:11, Alexandre Neto  escreveu:
>
> Ah sorry,
>
>
>
> I got lost in translation. You are right, I was talking about the magnetic
> north, not the geodetic one.
>
>
>
> Meanwhile,  remembering that all UTM are Transverse Mercator, I don't
> think there's a CRS that will solve you question.
>
>
>
> I think you need to use some formula to convert the grid north measures to
> true north according to the CRS, and the latitude and longitude of the
> place.
>
>
>
> Alexandre
>
>
>
> A ter, 3/04/2018, 09:25, Springfield Harrison 
> escreveu:
>
> Alexandre,
>
> I believe that true north is actually a constant oriented towards the
> North Pole, i e 90 degrees north latitude. Also where all meridians
> converge in the northern hemisphere.
>
> The other North orientations are magnetic north and grid North and these
> do vary as you suggested.
>
> I do need to use a UTM projection but need bearings to be in degrees true
> north.
>
> Thanks Alexandre...
>
> Cheers . . . . .   Spring
>
> Samsung Tab 4
>
> On Apr 2, 2018 4:27 PM, "Alexandre Neto"  wrote:
>
> AFAIK, true bearing differs in time and location because of magnetic
> declination. So I don't think there is a such thing as a CRS with true
> bearings.
>
>
>
> Assuming you are working at regional level, find 

Re: [Qgis-user] True North

[Kristian Evers]

I made it within the Layout Composer/Editor (what it’s called in QGIS3 escapes 
me now – it used to be Map Composer in 2.x). That was the simplest way to 
achieve it quickly I found. You have the possibility to add more than one 
graticule and you can also change the CRS of the graticule. That is what I did. 
One was kept in UTM, the other used my custom Mercator CRS.

This is just one way of doing it. There many ways to achieve the same thing, 
but this should outline the general idea at least.

My last post was not let through to the mailing list, so here’s a copy of the 
image I attached in the previous mail. Should anyone be interested…

/Kristian


Fra: Springfield Harrison [mailto:stellar...@gmail.com]
Sendt: 4. april 2018 16:19
Til: Kristian Evers 
Cc: qgis-user 
Emne: Re: SV: [Qgis-user] True North


Right, this looks promising.

I have been changing projections and then enabling the grid decoration which is 
always oriented straight up regardless of the projection.

I assume that you were inserting your grids as a vector feature using a drawing 
tool?

What was the CRS of the grid layer? I have been changing the project projection 
with OTF on. Maybe I should be adjusting the projection of the layer in 
question?

Thanks again . . .

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 4, 2018 5:23 AM, "Kristian Evers" > 
wrote:
I had a quick go at it after I wrote the email. What I did was to first create 
a custom projection with the proj-string “+proj=merc”. Then I opened the layout 
editor, inserted my map and added to sets of grid lines to the map. One of them 
was left with the original CRS (the UTM one) and for the other I used my custom 
CRS. This immediately gave me two grids, one where the meridians is oriented at 
the grid north (black in the attached image) and one oriented at true north 
(red in the attached image).

/Kristian

Fra: Springfield Harrison 
[mailto:stellar...@gmail.com]
Sendt: 3. april 2018 22:52
Til: qgis-user@lists.osgeo.org; Kristian 
Evers >
Emne: Re: [Qgis-user] True North

OK, that sounds like the solution I'm looking for.

It sounds like the answer is to draw the lines in one projection and then 
transform it to the other, depending upon which orientation is desired for 
those lines.

I hope I have this correct…
Cheers . . . . . Springfield Harrison


On 03-Apr-2018 02:46, Kristian Evers wrote:
You can use the Mercator projection to digitize true north lines. It is 
conformal and thus preserves angles. The meridian convergence is 0 (that is, 
true north == grid north) all over the map. If you then transform those lines 
to your chosen CRS you should have a set of lines pointing towards true north 
instead of grid north.

/Kristian

Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Alexandre 
Neto
Sendt: 3. april 2018 11:15
Til: Springfield Harrison 
Cc: qgis-user 
Emne: Re: [Qgis-user] True North

Maybe something like this :

https://gis.stackexchange.com/q/115531/6191

Alexandre
A ter, 3/04/2018, 10:11, Alexandre Neto 
> escreveu:
Ah sorry,

I got lost in translation. You are right, I was talking about the magnetic 
north, not the geodetic one.

Meanwhile,  remembering that all UTM are Transverse Mercator, I don't think 
there's a CRS that will solve you question.

I think you need to use some formula to convert the grid north measures to true 
north according to the CRS, and the latitude and longitude of the place.

Alexandre

A ter, 3/04/2018, 09:25, Springfield Harrison 
> escreveu:

Alexandre,

I believe that true north is actually a constant oriented towards the North 
Pole, i e 90 degrees north latitude. Also where all meridians converge in the 
northern hemisphere.

The other North orientations are magnetic north and grid North and these do 
vary as you suggested.

I do need to use a UTM projection but need bearings to be in degrees true north.

Thanks Alexandre...

Cheers . . . . .   Spring

Samsung Tab 4
On Apr 2, 2018 4:27 PM, "Alexandre Neto" 
> wrote:
AFAIK, true bearing differs in time and location because of magnetic 
declination. So I don't think there is a such thing as a CRS with true bearings.

Assuming you are working at regional level, find the magnetic declination for 
that region and remove it from your observations. Then draw the azimuth using 
the chosen CRS. I think 26910 will work just fine.

If you are at a larger scale, then you may need to use different magnetic 
declination values for each observation.

This may help:

https://www.ngdc.noaa.gov/geomag/declination.shtml

Best Regards,

Re: [Qgis-user] True North

[Springfield Harrison]

Right, this looks promising.

I have been changing projections and then enabling the grid decoration
which is always oriented straight up regardless of the projection.

I assume that you were inserting your grids as a vector feature using a
drawing tool?

What was the CRS of the grid layer? I have been changing the project
projection with OTF on. Maybe I should be adjusting the projection of the
layer in question?

Thanks again . . .

Cheers . . . . .   Spring
Samsung Tab 4
On Apr 4, 2018 5:23 AM, "Kristian Evers"  wrote:

> I had a quick go at it after I wrote the email. What I did was to first
> create a custom projection with the proj-string “+proj=merc”. Then I opened
> the layout editor, inserted my map and added to sets of grid lines to the
> map. One of them was left with the original CRS (the UTM one) and for the
> other I used my custom CRS. This immediately gave me two grids, one where
> the meridians is oriented at the grid north (black in the attached image)
> and one oriented at true north (red in the attached image).
>
>
>
> /Kristian
>
>
>
> *Fra:* Springfield Harrison [mailto:stellar...@gmail.com]
> *Sendt:* 3. april 2018 22:52
> *Til:* qgis-user@lists.osgeo.org; Kristian Evers 
> *Emne:* Re: [Qgis-user] True North
>
>
>
> OK, that sounds like the solution I'm looking for.
>
> It sounds like the answer is to draw the lines in one projection and then
> transform it to the other, depending upon which orientation is desired for
> those lines.
>
> I hope I have this correct…
>
> Cheers . . . . . Springfield Harrison
>
>
>
> On 03-Apr-2018 02:46, Kristian Evers wrote:
>
> You can use the Mercator projection to digitize true north lines. It is
> conformal and thus preserves angles. The meridian convergence is 0 (that
> is, true north == grid north) all over the map. If you then transform those
> lines to your chosen CRS you should have a set of lines pointing towards
> true north instead of grid north.
>
>
>
> /Kristian
>
>
>
> *Fra:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org
> ] *På vegne af *Alexandre Neto
> *Sendt:* 3. april 2018 11:15
> *Til:* Springfield Harrison  
> *Cc:* qgis-user  
> *Emne:* Re: [Qgis-user] True North
>
>
>
> Maybe something like this :
>
>
>
> https://gis.stackexchange.com/q/115531/6191
>
>
>
> Alexandre
>
> A ter, 3/04/2018, 10:11, Alexandre Neto  escreveu:
>
> Ah sorry,
>
>
>
> I got lost in translation. You are right, I was talking about the magnetic
> north, not the geodetic one.
>
>
>
> Meanwhile,  remembering that all UTM are Transverse Mercator, I don't
> think there's a CRS that will solve you question.
>
>
>
> I think you need to use some formula to convert the grid north measures to
> true north according to the CRS, and the latitude and longitude of the
> place.
>
>
>
> Alexandre
>
>
>
> A ter, 3/04/2018, 09:25, Springfield Harrison 
> escreveu:
>
> Alexandre,
>
> I believe that true north is actually a constant oriented towards the
> North Pole, i e 90 degrees north latitude. Also where all meridians
> converge in the northern hemisphere.
>
> The other North orientations are magnetic north and grid North and these
> do vary as you suggested.
>
> I do need to use a UTM projection but need bearings to be in degrees true
> north.
>
> Thanks Alexandre...
>
> Cheers . . . . .   Spring
>
> Samsung Tab 4
>
> On Apr 2, 2018 4:27 PM, "Alexandre Neto"  wrote:
>
> AFAIK, true bearing differs in time and location because of magnetic
> declination. So I don't think there is a such thing as a CRS with true
> bearings.
>
>
>
> Assuming you are working at regional level, find the magnetic declination
> for that region and remove it from your observations. Then draw the azimuth
> using the chosen CRS. I think 26910 will work just fine.
>
>
>
> If you are at a larger scale, then you may need to use different magnetic
> declination values for each observation.
>
>
>
> This may help:
>
>
>
> https://www.ngdc.noaa.gov/geomag/declination.shtml
>
>
>
> Best Regards,
>
>
>
> Alexandre Neto
>
> A seg, 2/04/2018, 23:54, Springfield Harrison 
> escreveu:
>
> Hello,
>
> I am using CRS 26910, NAD83 / UTM zone 10N, and need to draw lines at
> exact true bearings.  The Advanced Digitizing Tool seems to do this but
> which CRS would I use to ensure that the bearing is True?
>
> Thanks very much . . .
>
>
> Cheers . . . . . Springfield Harrison
>
>
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> --
>
> Alexandre Neto
>
> -
>
> @AlexNetoGeo
>
> http://sigsemgrilhetas.wordpress.com
>
> http://gisunchained.wordpress.com
>
> --
>
> 

Re: [Qgis-user] automatic recognition intersection

[Stefan Giese (WhereGroup)]

Hi Marcel,
may be this thread helps: 
https://stackoverflow.com/questions/12965090/get-list-of-all-intersections-in-a-city. 
The second answer with the overpass api will do the intersect for you. 
you can export it and load it into QGIS. But anyway, I thinks with a 
little bit of work, you can do it in QGIS too...


best regards
stefan

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Am 2018-04-04 16:07, schrieb Marcel Sieg:

Dear community,

is it possible to automatically recognize intersection in QGIS? So
lets say I just have a city map from openstreetmap with all the
streets, places and so on. What I am wanting to do is instead of set a
point on every intersection (which would take me weeks in a big city)
within a city I say to Qgis okay put on every intersection one dot
with the name of the streets. I am wondering if GIS can filter that
out from a regular openstreetmap file.

Mit freundlichen Grüßen

Marcel Sieg
Studentischer Mitarbeiter Bereitstellung Fahrradvermietung (P.PVB 3)

Deutsche Bahn Connect GmbH
Torgauer Straße 12-15, 10829 Berlin
Tel. n.b.
_
Der DB-Konzern im Internet >> http://www.deutschebahn.com [1]

Sitz der Gesellschaft: Frankfurt am Main
Registergericht: Frankfurt am Main, HRB 52 180
USt-IdNr.: DE 813214880
Geschäftsführer: Sylvia Lier (Vorsitzende), Moritz Rohrschneider



Links:
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[Qgis-user] automatic recognition intersection

[Marcel Sieg]

Dear community,
is it possible to automatically recognize intersection in QGIS? So lets say I 
just have a city map from openstreetmap with all the streets, places and so on. 
What I am wanting to do is instead of set a point on every intersection (which 
would take me weeks in a big city) within a city I say to Qgis okay put on 
every intersection one dot with the name of the streets. I am wondering if GIS 
can filter that out from a regular openstreetmap file.

Mit freundlichen Grüßen

Marcel Sieg
Studentischer Mitarbeiter Bereitstellung Fahrradvermietung (P.PVB 3)

Deutsche Bahn Connect GmbH
Torgauer Straße 12-15, 10829 Berlin
Tel. n.b.
_
Der DB-Konzern im Internet >> 
http://www.deutschebahn.com

Sitz der Gesellschaft: Frankfurt am Main
Registergericht: Frankfurt am Main, HRB 52 180
USt-IdNr.: DE 813214880
Geschäftsführer: Sylvia Lier (Vorsitzende), Moritz Rohrschneider

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Re: [Qgis-user] Help in Field Calculator

[Andreas Neumann]

Hi Daniel, 

One alternative way to do this, without field calculator, is to use the
"Processing Toolbox" (see menu processing) and use the "Count opints in
polygon (weighted)" algorithm. This should do what you want, but the
downside to this approach is that you end up with a new layer. 

If you want to use the field calculator (without creating a new layer)
you will have to look at aggregates and spatial relationship functions.
I am not 100% sure if this would work - I currently don't have the time
to test it - but might be worth a try. 

Good luck! 

Andreas 

On 2018-04-04 14:27, Daniel Alejandro Montecinos Rubilar wrote:

> Hi. I have a question urgent. What I try to do is then updated columns in a 
> data layer with another layer. For example , I have two layers A = Poligono , 
> B = Points . The layer B contains real values. Then would do two things. 1. 
> Count how many points of the layers B are within the layer A. 2. From the 
> points of the layer B that are within the polygon layer A, I need the sum of 
> their values ​​and paste this sum in a column of created layer A. I tried to 
> make the crossing with the "field calculator" function, using the functions: 
> "geomwithim", "geomintersects" and "intersecting_geom_sum", but without 
> results. 
> 
> I hope I have been able to explain. 
> 
> Greetings and thanks for your support. 
> 
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Re: [Qgis-user] Old maps from Austria

[Albin Blaschka]

Am 04.04.2018 13:54, schrieb Piotr Kania:

Hi,
I'm sorry that my question doesn't belong to "qgisworld" - I'm looking
for old maps, that comes from:
https://de.wikipedia.org/wiki/K.u.k._Milit%C3%A4rgeographisches_Institut.
Anyone from Austria - do You know how to get scans of old paper maps
in scale 1:20 000? I need it because I live and work in area, that
till the year 1914 was part of Austro-Hungarian Empire. Thanks for any
response


And another one:

http://lazarus.elte.hu/hun/digkonyv/topo/3felmeres.htm

HTH,
Albin

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Re: [Qgis-user] Old maps from Austria

[Albin Blaschka]

Am 04.04.2018 13:54, schrieb Piotr Kania:

Hi,
I'm sorry that my question doesn't belong to "qgisworld" - I'm looking
for old maps, that comes from:
https://de.wikipedia.org/wiki/K.u.k._Milit%C3%A4rgeographisches_Institut.
Anyone from Austria - do You know how to get scans of old paper maps
in scale 1:20 000? I need it because I live and work in area, that
till the year 1914 was part of Austro-Hungarian Empire. Thanks for any
response



Maybe something like that?

http://mapire.eu/en/

or maybe

http://alabamamaps.ua.edu/historicalmaps/europe/central_europe/austria-hungary_1891-1905.htm

all the best,
Albin


--
| Dr.rer.nat. Albin Blaschka
| Etrichstrasse 26, A-5020 Salzburg
| * www.standortsanalyse.net *
| * www.researchgate.net/profile/Albin_Blaschka *
| - It's hard to live in the mountains, hard but not hopeless!
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[Qgis-user] Help in Field Calculator

[Daniel Alejandro Montecinos Rubilar]

Hi. I have a question urgent. What I try to do is then updated columns in a 
data layer with another layer. For example , I have two layers A = Poligono , B 
= Points . The layer B contains real values. Then would do two things. 1. Count 
how many points of the layers B are within the layer A. 2. From the points of 
the layer B that are within the polygon layer A, I need the sum of their values 
​​and paste this sum in a column of created layer A. I tried to make the 
crossing with the "field calculator" function, using the functions: 
"geomwithim", "geomintersects" and "intersecting_geom_sum", but without results.

 

I hope I have been able to explain.

 

Greetings and thanks for your support.

 

 

 

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Re: [Qgis-user] True North

[Andreas Neumann]

Hi Daniel, 

Just do not reply to this e-mail thread, but send a plain new e-mail to
"qgis@u...@lists.osgeo.org" describing your problem with enough detail
that others can follow. 

Note also that this is an english language e-mail list - there may be
some spanish speaking subscribers on the list, but you are more likely
to get replies if you write in english. Or - alternatively - if you want
to write in spanish - you may use a localized e-mail list in a different
language. See https://wiki.osgeo.org/wiki/Local_Chapters or
https://www.qgis.org/en/site/forusers/usergroups.html as a starter. 

Going back to your "Update column" question - please have a look a the
"Field Calculator" - see the corresponding section in the QGIS manual:
https://docs.qgis.org/2.18/en/docs/user_manual/working_with_vector/field_calculator.html
 

Greetings, 

Andreas 

On 2018-04-04 13:45, Daniel Alejandro Montecinos Rubilar wrote:

> Ok, entonces podría indicarme en que correo solucionan ese problema, por 
> favor? Necesito hacer ese cruce con urgencia y no encuentro la solucion. 
> 
> Desde ya muchas gracias 
> 
> DE: Qgis-user  en nombre de Andreas 
> Neumann 
> FECHA: miércoles, 4 de abril de 2018, 08:41
> PARA: 
> ASUNTO: Re: [Qgis-user] True North 
> 
> Dear Daniel, 
> 
> Harrison just meant that is not nice to "hijack" an existing topic thread. If 
> you have a different issue, you should start a new e-mail thread just for 
> that new issue. 
> 
> Andreas 
> 
> On 04.04.2018 13:38, Daniel Alejandro Montecinos Rubilar wrote: 
> 
> Dear, what you refered?  The question is not understood or there is no 
> solution? 
> 
> DE: Springfield Harrison 
> ORGANIZACIÓN: Stellar GPS & Mapping
> FECHA: martes, 3 de abril de 2018, 17:53
> PARA: Daniel Alejandro Montecinos Rubilar 
> CC: 
> ASUNTO: Re: [Qgis-user] True North 
> 
> Hello Daniel,
> 
> You are on quite a different topic here.
> 
> I think you should repost your inquiry using a different subject...
> 
> Cheers . . . . . Springfield Harrison 
> 
> On 03-Apr-2018 06:35, Daniel Alejandro Montecinos Rubilar wrote: 
> 
> GOOD MORNING, 
> 
> I have a query, I have use Mapinfo for several years and I was discover QGIS 
> program and I want change me, but I'am searching one similar function but I 
> dont found. This function, in Mapinfo, his name is "Update Column". Below I 
> leave an image 
> 
> I appreciate your help, it is urgent!!!
> 
> [2] 
> 
> Virus-free. www.avg.com [2] 
> 
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[Qgis-user] Old maps from Austria

[Piotr Kania]

Hi, 
I'm sorry that my question doesn't belong to "qgisworld" - I'm looking for old 
maps, that comes from: 
https://de.wikipedia.org/wiki/K.u.k._Milit%C3%A4rgeographisches_Institut. 
Anyone from Austria - do You know how to get scans of old paper maps in scale 
1:20 000? I need it because I live and work in area, that till the year 1914 
was part of Austro-Hungarian Empire. Thanks for any response
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Re: [Qgis-user] True North

[Daniel Alejandro Montecinos Rubilar]

Ok, entonces podría indicarme en que correo solucionan ese problema, por favor? 
Necesito hacer ese cruce con urgencia y no encuentro la solucion.

 

Desde ya muchas gracias

 

De: Qgis-user  en nombre de Andreas Neumann 

Fecha: miércoles, 4 de abril de 2018, 08:41
Para: 
Asunto: Re: [Qgis-user] True North

 

Dear Daniel,

Harrison just meant that is not nice to "hijack" an existing topic thread. If 
you have a different issue, you should start a new e-mail thread just for that 
new issue.

Andreas

 

On 04.04.2018 13:38, Daniel Alejandro Montecinos Rubilar wrote:

Dear, what you refered?  The question is not understood or there is no solution?

 

De: Springfield Harrison 
Organización: Stellar GPS & Mapping
Fecha: martes, 3 de abril de 2018, 17:53
Para: Daniel Alejandro Montecinos Rubilar 
CC: 
Asunto: Re: [Qgis-user] True North

 

Hello Daniel,

You are on quite a different topic here.

I think you should repost your inquiry using a different subject…

Cheers . . . . . Springfield Harrison




On 03-Apr-2018 06:35, Daniel Alejandro Montecinos Rubilar wrote:

Good Morning,

 

I have a query, I have use Mapinfo for several years and I was discover QGIS 
program and I want change me, but I’am searching one similar function but I 
dont found. This function, in Mapinfo, his name is “Update Column”. Below I 
leave an image

 

 

I appreciate your help, it is urgent!!!

 

Virus-free. www.avg.com 




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Re: [Qgis-user] True North

[Andreas Neumann]

Dear Daniel,

Harrison just meant that is not nice to "hijack" an existing topic 
thread. If you have a different issue, you should start a new e-mail 
thread just for that new issue.


Andreas


On 04.04.2018 13:38, Daniel Alejandro Montecinos Rubilar wrote:


Dear, what you refered?  The question is not understood or there is no 
solution?


*De: *Springfield Harrison 
*Organización: *Stellar GPS & Mapping
*Fecha: *martes, 3 de abril de 2018, 17:53
*Para: *Daniel Alejandro Montecinos Rubilar 


*CC: *
*Asunto: *Re: [Qgis-user] True North

Hello Daniel,

You are on quite a different topic here.

I think you should repost your inquiry using a different subject…

Cheers . . . . . Springfield Harrison




On 03-Apr-2018 06:35, Daniel Alejandro Montecinos Rubilar wrote:

*Good Morning,*

**

I have a query, I have use Mapinfo for several years and I was
discover QGIS program and I want change me, but I’am searching one
similar function but I dont found. This function, in Mapinfo, his
name is “Update Column”. Below I leave an image

cid:image001.png@01D3CB37.7072D510

I appreciate your help, it is urgent!!!

Imagen quitada por el remitente.





Virus-free.

www.avg.com




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Re: [Qgis-user] True North

[Daniel Alejandro Montecinos Rubilar]

Dear, what you refered?  The question is not understood or there is no solution?

 

De: Springfield Harrison 
Organización: Stellar GPS & Mapping
Fecha: martes, 3 de abril de 2018, 17:53
Para: Daniel Alejandro Montecinos Rubilar 
CC: 
Asunto: Re: [Qgis-user] True North

 

Hello Daniel,

You are on quite a different topic here.

I think you should repost your inquiry using a different subject…

Cheers . . . . . Springfield Harrison




On 03-Apr-2018 06:35, Daniel Alejandro Montecinos Rubilar wrote:

Good Morning,

 

I have a query, I have use Mapinfo for several years and I was discover QGIS 
program and I want change me, but I’am searching one similar function but I 
dont found. This function, in Mapinfo, his name is “Update Column”. Below I 
leave an image

 

 

I appreciate your help, it is urgent!!!

 

Virus-free. www.avg.com 



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[Qgis-user] Copy-paste form definition (QGIS3)

[Jean-Baptiste Desbas]

Hello,

When I copy-paste a style form a layer to another, symbology AND form
definition are copied (because they are both part of style). Is it possible
to copy-paste form definition without symbology and vice versa ?

Thanks,
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