QGIS EPSG value differs from ArcGIS and spatialreference.org
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1
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Background:
I have both QGIS 3.4.1 and ArcGIS Desktop 10.6.1 installed on the same laptop, Windows 10.
I have a polygon shapefile that is projected to Lambert Conformal Conic. Arc states that the shapefile's EPSG value is 102004. Here's a screenshot from the Arc Layer Properties:
spatialreference.org agrees with Arc; 102004 is Lambert Conformal Conic:
So far, so good!
Problem:
QGIS states that this layer's EPSG value is different: 100027. Here's a QGIS screenshot:
But wait, there's more! spatialreference.org does not have an entry for 100027. Here's a screenshot:
Question:
Why doesn't the QGIS EPSG value match Arc and spatialreference.org? What does the 100027 value represent?
qgis arcgis-desktop coordinate-system epsg
edited 1 hour ago
Vince
14.3k32646
asked 1 hour ago
Stu Smith
1,8381330
add a comment |
up vote
1
down vote
favorite
Background:
I have both QGIS 3.4.1 and ArcGIS Desktop 10.6.1 installed on the same laptop, Windows 10.
I have a polygon shapefile that is projected to Lambert Conformal Conic. Arc states that the shapefile's EPSG value is 102004. Here's a screenshot from the Arc Layer Properties:
spatialreference.org agrees with Arc; 102004 is Lambert Conformal Conic:
So far, so good!
Problem:
QGIS states that this layer's EPSG value is different: 100027. Here's a QGIS screenshot:
But wait, there's more! spatialreference.org does not have an entry for 100027. Here's a screenshot:
Question:
Why doesn't the QGIS EPSG value match Arc and spatialreference.org? What does the 100027 value represent?
qgis arcgis-desktop coordinate-system epsg
edited 1 hour ago
Vince
14.3k32646
asked 1 hour ago
Stu Smith
1,8381330
102004 isn't an EPSG code, notice it isESRI:102004notEPSG:102004in spatialreference.org andWKID:102004 Authority:Esriin the layer properties.
– Luke
1 hour ago
QGIS does not state that it is an EPSG code. QGIS considers that CRS as somethign that does not belong to the EPSG database and gives it some number that is not reserved for EPSG codes. You can see that all the parameters are the same which means that this CRS behaves in the same way even it has a different code in QGIS.
– user30184
1 hour ago
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
Background:
I have both QGIS 3.4.1 and ArcGIS Desktop 10.6.1 installed on the same laptop, Windows 10.
I have a polygon shapefile that is projected to Lambert Conformal Conic. Arc states that the shapefile's EPSG value is 102004. Here's a screenshot from the Arc Layer Properties:
spatialreference.org agrees with Arc; 102004 is Lambert Conformal Conic:
So far, so good!
Problem:
QGIS states that this layer's EPSG value is different: 100027. Here's a QGIS screenshot:
But wait, there's more! spatialreference.org does not have an entry for 100027. Here's a screenshot:
Question:
Why doesn't the QGIS EPSG value match Arc and spatialreference.org? What does the 100027 value represent?
qgis arcgis-desktop coordinate-system epsg
edited 1 hour ago
Vince
14.3k32646
asked 1 hour ago
Stu Smith
1,8381330
Background:
I have both QGIS 3.4.1 and ArcGIS Desktop 10.6.1 installed on the same laptop, Windows 10.
I have a polygon shapefile that is projected to Lambert Conformal Conic. Arc states that the shapefile's EPSG value is 102004. Here's a screenshot from the Arc Layer Properties:
spatialreference.org agrees with Arc; 102004 is Lambert Conformal Conic:
So far, so good!
Problem:
QGIS states that this layer's EPSG value is different: 100027. Here's a QGIS screenshot:
But wait, there's more! spatialreference.org does not have an entry for 100027. Here's a screenshot:
Question:
Why doesn't the QGIS EPSG value match Arc and spatialreference.org? What does the 100027 value represent?
qgis arcgis-desktop coordinate-system epsg
qgis arcgis-desktop coordinate-system epsg
edited 1 hour ago
Vince
14.3k32646
asked 1 hour ago
Stu Smith
1,8381330
edited 1 hour ago
Vince
14.3k32646
asked 1 hour ago
Stu Smith
1,8381330
edited 1 hour ago
Vince
14.3k32646
edited 1 hour ago
Vince
14.3k32646
edited 1 hour ago
Vince
14.3k32646
14.3k32646
asked 1 hour ago
Stu Smith
1,8381330
asked 1 hour ago
Stu Smith
1,8381330
asked 1 hour ago
Stu Smith
1,8381330
1,8381330
102004 isn't an EPSG code, notice it isESRI:102004notEPSG:102004in spatialreference.org andWKID:102004 Authority:Esriin the layer properties.
– Luke
1 hour ago
QGIS does not state that it is an EPSG code. QGIS considers that CRS as somethign that does not belong to the EPSG database and gives it some number that is not reserved for EPSG codes. You can see that all the parameters are the same which means that this CRS behaves in the same way even it has a different code in QGIS.
– user30184
1 hour ago
add a comment |
102004 isn't an EPSG code, notice it isESRI:102004notEPSG:102004in spatialreference.org andWKID:102004 Authority:Esriin the layer properties.
– Luke
1 hour ago
QGIS does not state that it is an EPSG code. QGIS considers that CRS as somethign that does not belong to the EPSG database and gives it some number that is not reserved for EPSG codes. You can see that all the parameters are the same which means that this CRS behaves in the same way even it has a different code in QGIS.
– user30184
1 hour ago
102004 isn't an EPSG code, notice it is
ESRI:102004 not EPSG:102004 in spatialreference.org and WKID:102004 Authority:Esri in the layer properties.– Luke
1 hour ago
102004 isn't an EPSG code, notice it is
ESRI:102004 not EPSG:102004 in spatialreference.org and WKID:102004 Authority:Esri in the layer properties.– Luke
1 hour ago
QGIS does not state that it is an EPSG code. QGIS considers that CRS as somethign that does not belong to the EPSG database and gives it some number that is not reserved for EPSG codes. You can see that all the parameters are the same which means that this CRS behaves in the same way even it has a different code in QGIS.
– user30184
1 hour ago
QGIS does not state that it is an EPSG code. QGIS considers that CRS as somethign that does not belong to the EPSG database and gives it some number that is not reserved for EPSG codes. You can see that all the parameters are the same which means that this CRS behaves in the same way even it has a different code in QGIS.
– user30184
1 hour ago
add a comment |
1 Answer
1
active
oldest
votes
up vote
2
down vote
when you add a new custom projection to QGIS, it allocates a unique code to it and stores it in a local sqlite database (srs.db)
the first one you add is numbered 100000, the second is 100001... and numbers are allocated sequentially each time you do this. As @user30184 says, this is to prevent duplicates.
your 10027 doesn't correspond to the corresponding arcgis/spatialreference.org codes. It means that this is the 28th custom projection you've added (based on the uniqueness of the proj4 string for the projection)
The projection is shown as 'USER:10027', rather than 'ESRI:10027' or 'EPSG:10027', which suggests that it's not equivalent.
answered 1 hour ago
Steven Kay
16.3k21553
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
when you add a new custom projection to QGIS, it allocates a unique code to it and stores it in a local sqlite database (srs.db)
the first one you add is numbered 100000, the second is 100001... and numbers are allocated sequentially each time you do this. As @user30184 says, this is to prevent duplicates.
your 10027 doesn't correspond to the corresponding arcgis/spatialreference.org codes. It means that this is the 28th custom projection you've added (based on the uniqueness of the proj4 string for the projection)
The projection is shown as 'USER:10027', rather than 'ESRI:10027' or 'EPSG:10027', which suggests that it's not equivalent.
answered 1 hour ago
Steven Kay
16.3k21553
add a comment |
up vote
2
down vote
when you add a new custom projection to QGIS, it allocates a unique code to it and stores it in a local sqlite database (srs.db)
the first one you add is numbered 100000, the second is 100001... and numbers are allocated sequentially each time you do this. As @user30184 says, this is to prevent duplicates.
your 10027 doesn't correspond to the corresponding arcgis/spatialreference.org codes. It means that this is the 28th custom projection you've added (based on the uniqueness of the proj4 string for the projection)
The projection is shown as 'USER:10027', rather than 'ESRI:10027' or 'EPSG:10027', which suggests that it's not equivalent.
answered 1 hour ago
Steven Kay
16.3k21553
add a comment |
up vote
2
down vote
up vote
2
down vote
when you add a new custom projection to QGIS, it allocates a unique code to it and stores it in a local sqlite database (srs.db)
the first one you add is numbered 100000, the second is 100001... and numbers are allocated sequentially each time you do this. As @user30184 says, this is to prevent duplicates.
your 10027 doesn't correspond to the corresponding arcgis/spatialreference.org codes. It means that this is the 28th custom projection you've added (based on the uniqueness of the proj4 string for the projection)
The projection is shown as 'USER:10027', rather than 'ESRI:10027' or 'EPSG:10027', which suggests that it's not equivalent.
answered 1 hour ago
Steven Kay
16.3k21553
when you add a new custom projection to QGIS, it allocates a unique code to it and stores it in a local sqlite database (srs.db)
the first one you add is numbered 100000, the second is 100001... and numbers are allocated sequentially each time you do this. As @user30184 says, this is to prevent duplicates.
your 10027 doesn't correspond to the corresponding arcgis/spatialreference.org codes. It means that this is the 28th custom projection you've added (based on the uniqueness of the proj4 string for the projection)
The projection is shown as 'USER:10027', rather than 'ESRI:10027' or 'EPSG:10027', which suggests that it's not equivalent.
answered 1 hour ago
Steven Kay
16.3k21553
edited 55 mins ago
answered 1 hour ago
Steven Kay
16.3k21553
answered 1 hour ago
Steven Kay
16.3k21553
answered 1 hour ago
Steven Kay
16.3k21553
16.3k21553
add a comment |
add a comment |
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102004 isn't an EPSG code, notice it is
ESRI:102004notEPSG:102004in spatialreference.org andWKID:102004 Authority:Esriin the layer properties.– Luke
1 hour ago
QGIS does not state that it is an EPSG code. QGIS considers that CRS as somethign that does not belong to the EPSG database and gives it some number that is not reserved for EPSG codes. You can see that all the parameters are the same which means that this CRS behaves in the same way even it has a different code in QGIS.
– user30184
1 hour ago