Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis
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" : > 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 . > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis
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:qgis-user-boun...@lists.osgeo.org] On Behalf Of Tobias Wendorff Sent: March-09-17 2:42 PM To: Tudorache, Marian Cc: qgis-user@lists.osgeo.org 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 :) ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user 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. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis
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. http://spatialreference.org/ref/epsg/4326/ 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 < tobias.wendo...@tu-dortmund.de> 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 :) > > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis
I can but we use GRS80 not WGS84. Can I work with WGS84? Thanks, Marian From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Mark Seibel Sent: March-09-17 1:47 PM To: Tudorache, Marian Cc: qgis-user@lists.osgeo.org 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 mailto:marian.tudora...@navcanada.ca>> 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: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org> 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 XShift0.000 YShift0.000 Parameters 631816.16075 0.000 1 /* Projection type < 1 | 2 > 631816.16075 /*radius of sphere of reference -76 0 0.000 /* longitude of center of projection 5330 0.000 /* latitude of center of projection 0.0 /* false easting (meters) 0.0 /* false westing (meters) One more thing ArcInfo uses directive COORDINATES in AML to extract the coordinates. Thanks, Marian From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Mark Seibel Sent: March-07-17 11:18 AM To: Tudorache, Marian Cc: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org> 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. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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 :) ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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 < marian.tudora...@navcanada.ca> 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:* qgis-user@lists.osgeo.org > *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 > > XShift0.000 > > YShift0.000 > > Parameters 631816.16075 0.000 > > 1 /* Projection type < 1 | 2 > > > 631816.16075 /*radius of sphere of reference > > -76 0 0.000 /* longitude of center of projection > > 5330 0.000 /* latitude of center of projection > > 0.0 /* false easting (meters) > > 0.0 /* false westing (meters) > > > > One more thing ArcInfo uses directive COORDINATES in AML to extract the > coordinates. > > Thanks, > > Marian > > > > *From:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org > ] *On Behalf Of *Mark Seibel > *Sent:* March-07-17 11:18 AM > *To:* Tudorache, Marian > *Cc:* qgis-user@lists.osgeo.org > *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. > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis
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: qgis-user@lists.osgeo.org 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 XShift0.000 YShift0.000 Parameters 631816.16075 0.000 1 /* Projection type < 1 | 2 > 631816.16075 /*radius of sphere of reference -76 0 0.000 /* longitude of center of projection 5330 0.000 /* latitude of center of projection 0.0 /* false easting (meters) 0.0 /* false westing (meters) One more thing ArcInfo uses directive COORDINATES in AML to extract the coordinates. Thanks, Marian From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Mark Seibel Sent: March-07-17 11:18 AM To: Tudorache, Marian Cc: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org> 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. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis
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:qgis-user-boun...@lists.osgeo.org] On Behalf Of Tudorache, Marian Sent: tirsdag 7. mars 2017 19.19 To: Mark Seibel Cc: qgis-user@lists.osgeo.org 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 XShift0.000 YShift0.000 Parameters 631816.16075 0.000 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 0.0 /* false easting (meters) 0.0 /* false westing (meters) One more thing ArcInfo uses directive COORDINATES in AML to extract the coordinates. Thanks, Marian From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Mark Seibel Sent: March-07-17 11:18 AM To: Tudorache, Marian Cc: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org> 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. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Coordinates in map units are different between ArcInfo and Qgis
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 < marian.tudora...@navcanada.ca> 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 > > XShift0.000 > > YShift0.000 > > Parameters 631816.16075 0.000 > > 1 /* Projection type < 1 | 2 > > > 631816.16075 /*radius of sphere of reference > > -76 0 0.000 /* longitude of center of projection > > 5330 0.000 /* latitude of center of projection > > 0.0 /* false easting (meters) > > 0.0 /* false westing (meters) > > > > One more thing ArcInfo uses directive COORDINATES in AML to extract the > coordinates. > > Thanks, > > Marian > > > > *From:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] *On Behalf > Of *Mark Seibel > *Sent:* March-07-17 11:18 AM > *To:* Tudorache, Marian > *Cc:* qgis-user@lists.osgeo.org > *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. > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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 XShift0.000 YShift0.000 Parameters 631816.16075 0.000 1 /* Projection type < 1 | 2 > 631816.16075 /*radius of sphere of reference -76 0 0.000 /* longitude of center of projection 5330 0.000 /* latitude of center of projection 0.0 /* false easting (meters) 0.0 /* false westing (meters) One more thing ArcInfo uses directive COORDINATES in AML to extract the coordinates. Thanks, Marian From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Mark Seibel Sent: March-07-17 11:18 AM To: Tudorache, Marian Cc: qgis-user@lists.osgeo.org 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. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Coordinates in map units are different between ArcInfo and Qgis
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. 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. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
