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I made a union of two adjacent shp (points) files with the same theme (Geochemistry) so the resulting attribute table gave duplicated fields, for example: ID, As_ppm, Ag_ppm, Pb_ppm, ... , ID_2, As_ppm_2, Ag_ppm_2, Pb_ppm_2,...
And the elements of the first shp give 'NULL' in the fields of the second shp and vice-versa, As in the screenshot.

So my goal is to show the combined points for a speciffic element, say Arsenic, so I have tried, without success, expressions like As_ppm || As_ppm_2 , As_ppm + As_ppm_2, combine(As_ppm ,As_ppm_2).

qgis shapefile point attribute-table map-algebra

share|improve this question

edited 6 mins ago

Vince

14.8k32850

asked 1 hour ago

cavereapercavereaper

133

add a comment | 

0

I made a union of two adjacent shp (points) files with the same theme (Geochemistry) so the resulting attribute table gave duplicated fields, for example: ID, As_ppm, Ag_ppm, Pb_ppm, ... , ID_2, As_ppm_2, Ag_ppm_2, Pb_ppm_2,...
And the elements of the first shp give 'NULL' in the fields of the second shp and vice-versa, As in the screenshot.

So my goal is to show the combined points for a speciffic element, say Arsenic, so I have tried, without success, expressions like As_ppm || As_ppm_2 , As_ppm + As_ppm_2, combine(As_ppm ,As_ppm_2).

qgis shapefile point attribute-table map-algebra

share|improve this question

edited 6 mins ago

Vince

14.8k32850

asked 1 hour ago

cavereapercavereaper

133

add a comment | 

I made a union of two adjacent shp (points) files with the same theme (Geochemistry) so the resulting attribute table gave duplicated fields, for example: ID, As_ppm, Ag_ppm, Pb_ppm, ... , ID_2, As_ppm_2, Ag_ppm_2, Pb_ppm_2,...
And the elements of the first shp give 'NULL' in the fields of the second shp and vice-versa, As in the screenshot.

So my goal is to show the combined points for a speciffic element, say Arsenic, so I have tried, without success, expressions like As_ppm || As_ppm_2 , As_ppm + As_ppm_2, combine(As_ppm ,As_ppm_2).

qgis shapefile point attribute-table map-algebra

share|improve this question

edited 6 mins ago

Vince

14.8k32850

asked 1 hour ago

cavereapercavereaper

133

share|improve this question

edited 6 mins ago

Vince

14.8k32850

asked 1 hour ago

cavereapercavereaper

133

share|improve this question

edited 6 mins ago

Vince

14.8k32850

asked 1 hour ago

cavereapercavereaper

133

edited 6 mins ago

Vince

14.8k32850

edited 6 mins ago

Vince

14.8k32850

asked 1 hour ago

cavereapercavereaper

133

asked 1 hour ago

cavereapercavereaper

133

1 Answer
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Union (geoprocessing) feature make a "union" of 2 dataset (C = A united to B).
Probably you are tring to JOIN two dataset.

Try this:

1. Go to JOIN settings: (right click -> properties -> Join)


2. Add Vector Join of the second layer (click on "+" green-plus icon) and set these parameters:
   
   
   
   
   • Join Layer: "the second layer to join"
   
   
   • Join field: "ID"
   
   
   • Join Target: "ID"
   
   
   
   

We assume that "ID" is and unambiguous identifier for both the layer's elements.

share

answered 3 mins ago

gianfranco di pietrogianfranco di pietro

134

add a comment | 

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0

Union (geoprocessing) feature make a "union" of 2 dataset (C = A united to B).
Probably you are tring to JOIN two dataset.

Try this:

1. Go to JOIN settings: (right click -> properties -> Join)


2. Add Vector Join of the second layer (click on "+" green-plus icon) and set these parameters:
   
   
   
   
   • Join Layer: "the second layer to join"
   
   
   • Join field: "ID"
   
   
   • Join Target: "ID"
   
   
   
   

We assume that "ID" is and unambiguous identifier for both the layer's elements.

share

answered 3 mins ago

gianfranco di pietrogianfranco di pietro

134

add a comment | 

0

Union (geoprocessing) feature make a "union" of 2 dataset (C = A united to B).
Probably you are tring to JOIN two dataset.

Try this:

1. Go to JOIN settings: (right click -> properties -> Join)


2. Add Vector Join of the second layer (click on "+" green-plus icon) and set these parameters:
   
   
   
   
   • Join Layer: "the second layer to join"
   
   
   • Join field: "ID"
   
   
   • Join Target: "ID"
   
   
   
   

We assume that "ID" is and unambiguous identifier for both the layer's elements.

share

answered 3 mins ago

gianfranco di pietrogianfranco di pietro

134

add a comment | 

Union (geoprocessing) feature make a "union" of 2 dataset (C = A united to B).
Probably you are tring to JOIN two dataset.

Try this:

1. Go to JOIN settings: (right click -> properties -> Join)


2. Add Vector Join of the second layer (click on "+" green-plus icon) and set these parameters:
   
   
   
   
   • Join Layer: "the second layer to join"
   
   
   • Join field: "ID"
   
   
   • Join Target: "ID"
   
   
   
   

We assume that "ID" is and unambiguous identifier for both the layer's elements.

share

answered 3 mins ago

gianfranco di pietrogianfranco di pietro

134

share

answered 3 mins ago

gianfranco di pietrogianfranco di pietro

134

answered 3 mins ago

gianfranco di pietrogianfranco di pietro

134

answered 3 mins ago

gianfranco di pietrogianfranco di pietro

134