Coordinates in map units are different between ArcInfo and Qgis

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Coordinates in map units are different between ArcInfo and Qgis

Tudorache, Marian
Hi everyone,

I have two GIS systems. First one is based on ArcInfo and the other one is based on Qgis 2.10.

The system with ArcInfo uses Esri coverage data files.
QGIS is able to read coverage data but I see differences between the coordinate expressed on map units between the two.

For example:
A point has in ArcInfo the coordinates in map units (meters) x = -1273005.24 and y = 2898383.44.
The same point has in Qgis the coordinates in map units (meters) x = -1940424.5898 and y = 3192159.87877.

I looked in qgsmaptopixel.cpp how the mouse position coordinate is transformed to world map units coordinate and I have found this:
mx = x * mMapUnitsPerPixel + xMin
my = -1 * ((y – yMax) * mMapUnitsPerPixel – Ymin)

I have displayed the transformation parameters in Qgis using showParameters function and I got:
Map units/pixel: 6130.91 center: -337918, 1.36002e+06 rotation: 0, size: 1493x974
So it looks a pixel has 6130.91 meters.
Map center is located at -337918, 1.36002e+06 (probably meters)
I can’t figure out the value for xMax, xMin , yMax, yMin.

Can somebody explain me why coordinates in map units read by Qgis are different than those read by ArcInfo?
How can I make the two coordinates to be the same?
Thanks,
Marian

This electronic message, as well as any transmitted files included in the electronic message, may contain privileged or confidential information and is intended solely for the use of the individual(s) or entity to which it is addressed. If you have received this electronic message in error please notify the sender immediately and delete the electronic message. Any unauthorized copying, disclosure or distribution of the electronic message is strictly forbidden. NAV CANADA accepts no liability for any damage caused by any virus and/or other malicious code transmitted by this electronic communication.

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Re: Coordinates in map units are different between ArcInfo and Qgis

Mark Seibel
Hi.

Can somebody explain me why coordinates in map units read by Qgis are different than those read by ArcInfo?
How can I make the two coordinates to be the same?

What is the projection of the arc/info coverage?

Is QGIS set to the same projection?

Mark

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Re: Coordinates in map units are different between ArcInfo and Qgis

Tudorache, Marian

Hi Mark,

 

 

The projection that I use in Qgis and ArcInfo is:

QGIS: +proj-sterea +lat_0=53.5 + lon_0=-76.0 +k=0.9996 +x_0=0.0 +y_0=0.0 +a=631816.16075 +b=631816.16075 +units=m +nodefs

ArcInfo: has different representation but the same thing:

Projection           STEREOGRAPHIC

Datum                  NONE

Zunits                   NO

Units                     METERS

XShift                    0.00000000000

YShift                    0.00000000000

Parameters         631816.16075 0.00000000000

                              1 /* Projection type < 1 | 2 >

631816.16075       /*radius of sphere of reference

-76   0 0.000           /* longitude of center of projection

53    30 0.000         /* latitude of center of projection

0.00000                  /* false easting (meters)

0.00000                  /* false westing (meters)

 

One more thing ArcInfo uses directive COORDINATES in AML to extract the coordinates.

Thanks,

Marian

 

From: Qgis-user [mailto:[hidden email]] On Behalf Of Mark Seibel
Sent: March-07-17 11:18 AM
To: Tudorache, Marian
Cc: [hidden email]
Subject: Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

Hi.


Can somebody explain me why coordinates in map units read by Qgis are different than those read by ArcInfo?
How can I make the two coordinates to be the same?

 

What is the projection of the arc/info coverage?

 

Is QGIS set to the same projection?

 

Mark



This electronic message, as well as any transmitted files included in the electronic message, may contain privileged or confidential information and is intended solely for the use of the individual(s) or entity to which it is addressed. If you have received this electronic message in error please notify the sender immediately and delete the electronic message. Any unauthorized copying, disclosure or distribution of the electronic message is strictly forbidden. NAV CANADA accepts no liability for any damage caused by any virus and/or other malicious code transmitted by this electronic communication.

Le présent message électronique et tout fichier qui peut y être joint peuvent contenir des renseignements privilégiés ou confidentiels destinés à l’usage exclusif des personnes ou des organismes à qui ils s’adressent. Si vous avez reçu ce message électronique par erreur, veuillez en informer l’expéditeur immédiatement et supprimez le. Toute reproduction, divulgation ou distribution du présent message électronique est strictement interdite. NAV CANADA n’assume aucune responsabilité en cas de dommage causé par tout virus ou autre programme malveillant transmis par ce message électronique.

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Re: Coordinates in map units are different between ArcInfo and Qgis

Mark Seibel
If you fire up ArcEdit what are the coordinates at some comparable location in QGIS? (as opposed to the coordinates usage in AML)

Or if you view the A/I coverage in another software like ArcView 3.x/ArcMap, are the coordinates the same in QGIS?

Maybe try converting your coverage to a shapefile, and see if there is a difference?

Another option is to set no coordinate system, or disable 'project on the fly', and see what the coordinates are for the data.

Just some suggestions, I really cant explain why there difference. AFAIK, A/I coverages shouldnt matter, but they are rather archaic.

Mark

On Tue, Mar 7, 2017 at 1:19 PM, Tudorache, Marian <[hidden email]> wrote:

Hi Mark,

 

 

The projection that I use in Qgis and ArcInfo is:

QGIS: +proj-sterea +lat_0=53.5 + lon_0=-76.0 +k=0.9996 +x_0=0.0 +y_0=0.0 +a=631816.16075 +b=631816.16075 +units=m +nodefs

ArcInfo: has different representation but the same thing:

Projection           STEREOGRAPHIC

Datum                  NONE

Zunits                   NO

Units                     METERS

XShift                    0.00000000000

YShift                    0.00000000000

Parameters         631816.16075 0.00000000000

                              1 /* Projection type < 1 | 2 >

631816.16075       /*radius of sphere of reference

-76   0 0.000           /* longitude of center of projection

53    30 0.000         /* latitude of center of projection

0.00000                  /* false easting (meters)

0.00000                  /* false westing (meters)

 

One more thing ArcInfo uses directive COORDINATES in AML to extract the coordinates.

Thanks,

Marian

 

From: Qgis-user [mailto:[hidden email]] On Behalf Of Mark Seibel
Sent: March-07-17 11:18 AM
To: Tudorache, Marian
Cc: [hidden email]
Subject: Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

Hi.


Can somebody explain me why coordinates in map units read by Qgis are different than those read by ArcInfo?
How can I make the two coordinates to be the same?

 

What is the projection of the arc/info coverage?

 

Is QGIS set to the same projection?

 

Mark



This electronic message, as well as any transmitted files included in the electronic message, may contain privileged or confidential information and is intended solely for the use of the individual(s) or entity to which it is addressed. If you have received this electronic message in error please notify the sender immediately and delete the electronic message. Any unauthorized copying, disclosure or distribution of the electronic message is strictly forbidden. NAV CANADA accepts no liability for any damage caused by any virus and/or other malicious code transmitted by this electronic communication.

Le présent message électronique et tout fichier qui peut y être joint peuvent contenir des renseignements privilégiés ou confidentiels destinés à l’usage exclusif des personnes ou des organismes à qui ils s’adressent. Si vous avez reçu ce message électronique par erreur, veuillez en informer l’expéditeur immédiatement et supprimez le. Toute reproduction, divulgation ou distribution du présent message électronique est strictement interdite. NAV CANADA n’assume aucune responsabilité en cas de dommage causé par tout virus ou autre programme malveillant transmis par ce message électronique.


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SBL
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Re: Coordinates in map units are different between ArcInfo and Qgis

SBL
In reply to this post by Tudorache, Marian

Hi,

 

The scaling factor “+k=0.9996” does not seem to be present in your ArcInfo CRS…

Could be a reason...

 

Cheers

Stefan

 

 

From: Qgis-user [mailto:[hidden email]] On Behalf Of Tudorache, Marian
Sent: tirsdag 7. mars 2017 19.19
To: Mark Seibel <[hidden email]>
Cc: [hidden email]
Subject: Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

Hi Mark,

 

 

The projection that I use in Qgis and ArcInfo is:

QGIS: +proj-sterea +lat_0=53.5 + lon_0=-76.0 +k=0.9996 +x_0=0.0 +y_0=0.0 +a=631816.16075 +b=631816.16075 +units=m +nodefs

ArcInfo: has different representation but the same thing:

Projection           STEREOGRAPHIC

Datum                  NONE

Zunits                   NO

Units                     METERS

XShift                    0.00000000000

YShift                    0.00000000000

Parameters         631816.16075 0.00000000000

                              1 /* Projection type < 1 | 2 >

631816.16075       /*radius of sphere of reference

-76   0 0.000           /* longitude of center of projection

53     30 0.000         /* latitude of center of projection

0.00000                  /* false easting (meters)

0.00000                  /* false westing (meters)

 

One more thing ArcInfo uses directive COORDINATES in AML to extract the coordinates.

Thanks,

Marian

 

From: Qgis-user [[hidden email]] On Behalf Of Mark Seibel
Sent: March-07-17 11:18 AM
To: Tudorache, Marian
Cc:
[hidden email]
Subject: Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

Hi.


Can somebody explain me why coordinates in map units read by Qgis are different than those read by ArcInfo?
How can I make the two coordinates to be the same?

 

What is the projection of the arc/info coverage?

 

Is QGIS set to the same projection?

 

Mark

 


This electronic message, as well as any transmitted files included in the electronic message, may contain privileged or confidential information and is intended solely for the use of the individual(s) or entity to which it is addressed. If you have received this electronic message in error please notify the sender immediately and delete the electronic message. Any unauthorized copying, disclosure or distribution of the electronic message is strictly forbidden. NAV CANADA accepts no liability for any damage caused by any virus and/or other malicious code transmitted by this electronic communication.

Le présent message électronique et tout fichier qui peut y être joint peuvent contenir des renseignements privilégiés ou confidentiels destinés à l’usage exclusif des personnes ou des organismes à qui ils s’adressent. Si vous avez reçu ce message électronique par erreur, veuillez en informer l’expéditeur immédiatement et supprimez le. Toute reproduction, divulgation ou distribution du présent message électronique est strictement interdite. NAV CANADA n’assume aucune responsabilité en cas de dommage causé par tout virus ou autre programme malveillant transmis par ce message électronique.


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Re: Coordinates in map units are different between ArcInfo and Qgis

Tudorache, Marian
In reply to this post by Mark Seibel

Hi again Mark,

 

It seems the reason why I get different x and y in ArcInfo is because I have to transform those coordinate based on magnetic declination.

Could you tell me how can I modify the projection string +proj-sterea +lat_0=53.5 + lon_0=-76.0 +k=0.9996 +x_0=0.0 +y_0=0.0 +a=631816.16075 +b=631816.16075 +units=m +nodefs

So I can include the magnetic declination?

I want to try to see what will be the coordinate when I use true North and magnetic North.

 

Thank you,

Marian

 

From: Tudorache, Marian
Sent: March-07-17 1:19 PM
To: 'Mark Seibel'
Cc: [hidden email]
Subject: RE: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

Hi Mark,

 

 

The projection that I use in Qgis and ArcInfo is:

QGIS: +proj-sterea +lat_0=53.5 + lon_0=-76.0 +k=0.9996 +x_0=0.0 +y_0=0.0 +a=631816.16075 +b=631816.16075 +units=m +nodefs

ArcInfo: has different representation but the same thing:

Projection           STEREOGRAPHIC

Datum                  NONE

Zunits                   NO

Units                     METERS

XShift                    0.00000000000

YShift                    0.00000000000

Parameters         631816.16075 0.00000000000

                              1 /* Projection type < 1 | 2 >

631816.16075       /*radius of sphere of reference

-76   0 0.000           /* longitude of center of projection

53    30 0.000         /* latitude of center of projection

0.00000                  /* false easting (meters)

0.00000                  /* false westing (meters)

 

One more thing ArcInfo uses directive COORDINATES in AML to extract the coordinates.

Thanks,

Marian

 

From: Qgis-user [[hidden email]] On Behalf Of Mark Seibel
Sent: March-07-17 11:18 AM
To: Tudorache, Marian
Cc: [hidden email]
Subject: Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

Hi.


Can somebody explain me why coordinates in map units read by Qgis are different than those read by ArcInfo?
How can I make the two coordinates to be the same?

 

What is the projection of the arc/info coverage?

 

Is QGIS set to the same projection?

 

Mark



This electronic message, as well as any transmitted files included in the electronic message, may contain privileged or confidential information and is intended solely for the use of the individual(s) or entity to which it is addressed. If you have received this electronic message in error please notify the sender immediately and delete the electronic message. Any unauthorized copying, disclosure or distribution of the electronic message is strictly forbidden. NAV CANADA accepts no liability for any damage caused by any virus and/or other malicious code transmitted by this electronic communication.

Le présent message électronique et tout fichier qui peut y être joint peuvent contenir des renseignements privilégiés ou confidentiels destinés à l’usage exclusif des personnes ou des organismes à qui ils s’adressent. Si vous avez reçu ce message électronique par erreur, veuillez en informer l’expéditeur immédiatement et supprimez le. Toute reproduction, divulgation ou distribution du présent message électronique est strictement interdite. NAV CANADA n’assume aucune responsabilité en cas de dommage causé par tout virus ou autre programme malveillant transmis par ce message électronique.

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Re: Coordinates in map units are different between ArcInfo and Qgis

Mark Seibel
I would project them it to another coordinate system with ARC.

Can you project them to a geographic coordinate system like EPSG: 4326 (WGS84), or projected coordinate system?

Mark

On Thu, Mar 9, 2017 at 1:33 PM, Tudorache, Marian <[hidden email]> wrote:

Hi again Mark,

 

It seems the reason why I get different x and y in ArcInfo is because I have to transform those coordinate based on magnetic declination.

Could you tell me how can I modify the projection string +proj-sterea +lat_0=53.5 + lon_0=-76.0 +k=0.9996 +x_0=0.0 +y_0=0.0 +a=631816.16075 +b=631816.16075 +units=m +nodefs

So I can include the magnetic declination?

I want to try to see what will be the coordinate when I use true North and magnetic North.

 

Thank you,

Marian

 

From: Tudorache, Marian
Sent: March-07-17 1:19 PM
To: 'Mark Seibel'
Cc: [hidden email]
Subject: RE: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

Hi Mark,

 

 

The projection that I use in Qgis and ArcInfo is:

QGIS: +proj-sterea +lat_0=53.5 + lon_0=-76.0 +k=0.9996 +x_0=0.0 +y_0=0.0 +a=631816.16075 +b=631816.16075 +units=m +nodefs

ArcInfo: has different representation but the same thing:

Projection           STEREOGRAPHIC

Datum                  NONE

Zunits                   NO

Units                     METERS

XShift                    0.00000000000

YShift                    0.00000000000

Parameters         631816.16075 0.00000000000

                              1 /* Projection type < 1 | 2 >

631816.16075       /*radius of sphere of reference

-76   0 0.000           /* longitude of center of projection

53    30 0.000         /* latitude of center of projection

0.00000                  /* false easting (meters)

0.00000                  /* false westing (meters)

 

One more thing ArcInfo uses directive COORDINATES in AML to extract the coordinates.

Thanks,

Marian

 

From: Qgis-user [[hidden email]] On Behalf Of Mark Seibel
Sent: March-07-17 11:18 AM
To: Tudorache, Marian
Cc: [hidden email]
Subject: Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

Hi.


Can somebody explain me why coordinates in map units read by Qgis are different than those read by ArcInfo?
How can I make the two coordinates to be the same?

 

What is the projection of the arc/info coverage?

 

Is QGIS set to the same projection?

 

Mark



This electronic message, as well as any transmitted files included in the electronic message, may contain privileged or confidential information and is intended solely for the use of the individual(s) or entity to which it is addressed. If you have received this electronic message in error please notify the sender immediately and delete the electronic message. Any unauthorized copying, disclosure or distribution of the electronic message is strictly forbidden. NAV CANADA accepts no liability for any damage caused by any virus and/or other malicious code transmitted by this electronic communication.

Le présent message électronique et tout fichier qui peut y être joint peuvent contenir des renseignements privilégiés ou confidentiels destinés à l’usage exclusif des personnes ou des organismes à qui ils s’adressent. Si vous avez reçu ce message électronique par erreur, veuillez en informer l’expéditeur immédiatement et supprimez le. Toute reproduction, divulgation ou distribution du présent message électronique est strictement interdite. NAV CANADA n’assume aucune responsabilité en cas de dommage causé par tout virus ou autre programme malveillant transmis par ce message électronique.


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Re: Coordinates in map units are different between ArcInfo and Qgis

Tudorache, Marian

I can but we use GRS80 not WGS84.

Can I work with WGS84?

 

Thanks,

Marian

 

 

 

From: Qgis-user [mailto:[hidden email]] On Behalf Of Mark Seibel
Sent: March-09-17 1:47 PM
To: Tudorache, Marian
Cc: [hidden email]
Subject: Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

I would project them it to another coordinate system with ARC.


Can you project them to a geographic coordinate system like EPSG: 4326 (WGS84), or projected coordinate system?

 

Mark

 

On Thu, Mar 9, 2017 at 1:33 PM, Tudorache, Marian <[hidden email]> wrote:

Hi again Mark,

 

It seems the reason why I get different x and y in ArcInfo is because I have to transform those coordinate based on magnetic declination.

Could you tell me how can I modify the projection string +proj-sterea +lat_0=53.5 + lon_0=-76.0 +k=0.9996 +x_0=0.0 +y_0=0.0 +a=631816.16075 +b=631816.16075 +units=m +nodefs

So I can include the magnetic declination?

I want to try to see what will be the coordinate when I use true North and magnetic North.

 

Thank you,

Marian

 

From: Tudorache, Marian
Sent: March-07-17 1:19 PM
To: 'Mark Seibel'
Cc: [hidden email]
Subject: RE: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

Hi Mark,

 

 

The projection that I use in Qgis and ArcInfo is:

QGIS: +proj-sterea +lat_0=53.5 + lon_0=-76.0 +k=0.9996 +x_0=0.0 +y_0=0.0 +a=631816.16075 +b=631816.16075 +units=m +nodefs

ArcInfo: has different representation but the same thing:

Projection           STEREOGRAPHIC

Datum                  NONE

Zunits                   NO

Units                     METERS

XShift                    0.00000000000

YShift                    0.00000000000

Parameters         631816.16075 0.00000000000

                              1 /* Projection type < 1 | 2 >

631816.16075       /*radius of sphere of reference

-76   0 0.000           /* longitude of center of projection

53    30 0.000         /* latitude of center of projection

0.00000                  /* false easting (meters)

0.00000                  /* false westing (meters)

 

One more thing ArcInfo uses directive COORDINATES in AML to extract the coordinates.

Thanks,

Marian

 

From: Qgis-user [[hidden email]] On Behalf Of Mark Seibel
Sent: March-07-17 11:18 AM
To: Tudorache, Marian
Cc: [hidden email]
Subject: Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

 

Hi.


Can somebody explain me why coordinates in map units read by Qgis are different than those read by ArcInfo?
How can I make the two coordinates to be the same?

 

What is the projection of the arc/info coverage?

 

Is QGIS set to the same projection?

 

Mark

 


This electronic message, as well as any transmitted files included in the electronic message, may contain privileged or confidential information and is intended solely for the use of the individual(s) or entity to which it is addressed. If you have received this electronic message in error please notify the sender immediately and delete the electronic message. Any unauthorized copying, disclosure or distribution of the electronic message is strictly forbidden. NAV CANADA accepts no liability for any damage caused by any virus and/or other malicious code transmitted by this electronic communication.

Le présent message électronique et tout fichier qui peut y être joint peuvent contenir des renseignements privilégiés ou confidentiels destinés à l’usage exclusif des personnes ou des organismes à qui ils s’adressent. Si vous avez reçu ce message électronique par erreur, veuillez en informer l’expéditeur immédiatement et supprimez le. Toute reproduction, divulgation ou distribution du présent message électronique est strictement interdite. NAV CANADA n’assume aucune responsabilité en cas de dommage causé par tout virus ou autre programme malveillant transmis par ce message électronique.

 


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Re: Coordinates in map units are different between ArcInfo and Qgis

Tobias Wendorff
In reply to this post by Tudorache, Marian
Am Do, 9.03.2017, 19:33 schrieb Tudorache, Marian:
>
> It seems the reason why I get different x and y in ArcInfo is because I
> have to transform those coordinate based on magnetic declination.

What, a dynamic projection connected the Earth' magnetic declination?
I thought, I've already seen everything in GIS world :)

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Re: Coordinates in map units are different between ArcInfo and Qgis

Mark Seibel
Expect nothing but surprises and bewilderment when working with that monopolized GIS company. =D

You can work in WGS84, or GRS80. Just some other geographic coordinate system that doesnt use stereographic.


IF you have a local state plane or UTM, that could work for projected systems

Mark

On Thu, Mar 9, 2017 at 2:42 PM, Tobias Wendorff <[hidden email]> wrote:
Am Do, 9.03.2017, 19:33 schrieb Tudorache, Marian:
>
> It seems the reason why I get different x and y in ArcInfo is because I
> have to transform those coordinate based on magnetic declination.

What, a dynamic projection connected the Earth' magnetic declination?
I thought, I've already seen everything in GIS world :)



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Drawing Parallel Lines

Springfield Harrison
In reply to this post by Mark Seibel
Hello,

I'm attempting to draw lines parallel to existing property lines but in
another layer.

It looks like there are tools (more than one) in Advanced digitizing but
no instructions on their use.

I've muddled through wasting no end of time with no consistent results.  
At one point a new layer was spontaneously created!  I get weird lines
unrelated to the parallel concept but they are not listed in the
attribute table of the new layer!  Can't detect any behaviour patterns here.

Is there a logical sequence of events for this?

             Thanks very much . . . .

Cheers . . . . . Springfield Harrison



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Drawing Parallel Lines

DelazJ
Hi,
It seems that you are a lucky guy. A description is being written at https://github.com/ghtmtt/QGIS-Documentation/blob/6d09f9fd94e0ddd6dec6b95b030e988ca94d9cce/source/docs/user_manual/working_with_vector/editing_geometry_attributes.rst#the-advanced-digitizing-panel
You can give it a test and comment/review at https://github.com/qgis/QGIS-Documentation/pull/1742.

Any help is welcome.
Thanks,
Harrissou

Le vendredi 10 mars 2017, Springfield Harrison <[hidden email]> a écrit :

> Hello,
>
> I'm attempting to draw lines parallel to existing property lines but in another layer.
>
> It looks like there are tools (more than one) in Advanced digitizing but no instructions on their use.
>
> I've muddled through wasting no end of time with no consistent results.  At one point a new layer was spontaneously created!  I get weird lines unrelated to the parallel concept but they are not listed in the attribute table of the new layer!  Can't detect any behaviour patterns here.
>
> Is there a logical sequence of events for this?
>
>             Thanks very much . . . .
>
> Cheers . . . . . Springfield Harrison
>
>
>
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Re: Drawing Parallel Lines

ghtmtt
In reply to this post by Springfield Harrison
Hi Harrison,

as pointed out by Harrissou you can find a description of exactly what
you need here (in continuous improvements):

https://github.com/qgis/QGIS-Documentation/pull/1742

and a preview of the content here (but without the image preview):

https://github.com/ghtmtt/QGIS-Documentation/blob/adv_digit/source/docs/user_manual/working_with_vector/editing_geometry_attributes.rst#the-advanced-digitizing-panel


please have a look at it and make comment in the PR so the text can be
changed before it goes on the website and the official documentation

Thanks

Matteo
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Re: Coordinates in map units are different between ArcInfo and Qgis

Tudorache, Marian
In reply to this post by Tobias Wendorff
Well some of our maps are not on True North.
Each point on the map was transformed by applying a rotation equal to the angle between the true north pole and magnetic north .



-----Original Message-----
From: Qgis-user [mailto:[hidden email]] On Behalf Of Tobias Wendorff
Sent: March-09-17 2:42 PM
To: Tudorache, Marian
Cc: [hidden email]
Subject: Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis

Am Do, 9.03.2017, 19:33 schrieb Tudorache, Marian:
>
> It seems the reason why I get different x and y in ArcInfo is because
> I have to transform those coordinate based on magnetic declination.

What, a dynamic projection connected the Earth' magnetic declination?
I thought, I've already seen everything in GIS world :)

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Re: Coordinates in map units are different between ArcInfo and Qgis

Tobias Wendorff
I had a presesentation about this some years ago on INTERGEO fair. It was about nautic maps and how to use them with a compass (sailing from Europe to America).

I am from Germany, our "Norths" are identical, but on a trip from South to North America with a compass only would make lots of trouble.

Thanks for your ideas in this topic :)


--
Von einem iPhone gesendet und wird daher Fehler enthalten…

Am 15.03.2017 um 23:19 schrieb "Tudorache, Marian" <[hidden email]>:

> Well some of our maps are not on True North.
> Each point on the map was transformed by applying a rotation equal to the angle between the true north pole and magnetic north .
>
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