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Updating two or more fields in QGIS?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

0

I have 5 layers:

1. NAM_USA (It has four fields of our interest, named 'bare', 'sand', 'woody' and 'built' depicting feature counts in each of the below corresponding layers.)


2. Baresoil


3. Woodyland


4. Sandbeach


5. Builtup

The process is :

1. Jump to a feature(grid) in NAM_USA using go2nextfeature plugin.


2. Calculate predefined expressions on NAM_USA fields 'bare', 'sand', 'woody' and 'built'. The calculated values are before step 3 feature counts in layers 'Baresoil', 'Sandbeach', Woodyland' and 'Builtup' respectively.


3. Make new features in layers 'Woodyland', 'Sandbeach', 'Baresoil' and 'Builtup' if any.


4. Press "go to next feature". Now, before jumping to next grid tile, the plugin AutoField will execute some expressions on rest of the fields of NAM_USA based on the calculated values of 'bare', 'sand', 'woody' and 'built' in step 2 and current values.

At present I have to calculate expression on all four fields individually in step 2.

What I want : Calculate expression on all four fields in step 2 in a single click.

Is there any method or plugin by which I can reduce the efforts of calculating individually?

I do not have good knowledge of PyQGIS.

qgis qgis-plugins qgis-processing

share|improve this question

edited 14 mins ago

Keshav Sharma

asked 16 hours ago

Keshav SharmaKeshav Sharma

424

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  one hint : rephrase your question to make it more "understandable" ...
  
  – snaileater
  16 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Done!!! Kindly see!!
  
  – Keshav Sharma
  15 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you can update to QGIS 3.4, you won't have to re-calculate your fields when you update the layer. QGIS 3 has virtual fields, which automatically stay up to date. This feature replaced the AutoField plugin.
  
  – csk
  8 hours ago
  

  
  
  
  

add a comment | 

0

I have 5 layers:

1. NAM_USA (It has four fields of our interest, named 'bare', 'sand', 'woody' and 'built' depicting feature counts in each of the below corresponding layers.)


2. Baresoil


3. Woodyland


4. Sandbeach


5. Builtup

The process is :

1. Jump to a feature(grid) in NAM_USA using go2nextfeature plugin.


2. Calculate predefined expressions on NAM_USA fields 'bare', 'sand', 'woody' and 'built'. The calculated values are before step 3 feature counts in layers 'Baresoil', 'Sandbeach', Woodyland' and 'Builtup' respectively.


3. Make new features in layers 'Woodyland', 'Sandbeach', 'Baresoil' and 'Builtup' if any.


4. Press "go to next feature". Now, before jumping to next grid tile, the plugin AutoField will execute some expressions on rest of the fields of NAM_USA based on the calculated values of 'bare', 'sand', 'woody' and 'built' in step 2 and current values.

At present I have to calculate expression on all four fields individually in step 2.

What I want : Calculate expression on all four fields in step 2 in a single click.

Is there any method or plugin by which I can reduce the efforts of calculating individually?

I do not have good knowledge of PyQGIS.

qgis qgis-plugins qgis-processing

share|improve this question

edited 14 mins ago

Keshav Sharma

asked 16 hours ago

Keshav SharmaKeshav Sharma

424

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  one hint : rephrase your question to make it more "understandable" ...
  
  – snaileater
  16 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Done!!! Kindly see!!
  
  – Keshav Sharma
  15 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you can update to QGIS 3.4, you won't have to re-calculate your fields when you update the layer. QGIS 3 has virtual fields, which automatically stay up to date. This feature replaced the AutoField plugin.
  
  – csk
  8 hours ago
  

  
  
  
  

add a comment | 

I have 5 layers:

1. NAM_USA (It has four fields of our interest, named 'bare', 'sand', 'woody' and 'built' depicting feature counts in each of the below corresponding layers.)


2. Baresoil


3. Woodyland


4. Sandbeach


5. Builtup

The process is :

1. Jump to a feature(grid) in NAM_USA using go2nextfeature plugin.


2. Calculate predefined expressions on NAM_USA fields 'bare', 'sand', 'woody' and 'built'. The calculated values are before step 3 feature counts in layers 'Baresoil', 'Sandbeach', Woodyland' and 'Builtup' respectively.


3. Make new features in layers 'Woodyland', 'Sandbeach', 'Baresoil' and 'Builtup' if any.


4. Press "go to next feature". Now, before jumping to next grid tile, the plugin AutoField will execute some expressions on rest of the fields of NAM_USA based on the calculated values of 'bare', 'sand', 'woody' and 'built' in step 2 and current values.

At present I have to calculate expression on all four fields individually in step 2.

What I want : Calculate expression on all four fields in step 2 in a single click.

Is there any method or plugin by which I can reduce the efforts of calculating individually?

I do not have good knowledge of PyQGIS.

qgis qgis-plugins qgis-processing

share|improve this question

edited 14 mins ago

Keshav Sharma

asked 16 hours ago

Keshav SharmaKeshav Sharma

424

share|improve this question

edited 14 mins ago

Keshav Sharma

asked 16 hours ago

Keshav SharmaKeshav Sharma

424

share|improve this question

edited 14 mins ago

Keshav Sharma

asked 16 hours ago

Keshav SharmaKeshav Sharma

424

asked 16 hours ago

Keshav SharmaKeshav Sharma

424

asked 16 hours ago

Keshav SharmaKeshav Sharma

424

1 Answer
1

active

oldest

votes

0

Not sure i fully understand your question but ... :

In NAM_USA u can populate your 4 fields (bare,sand, woody, built) with the following expression :

intersecting_geom_count('bare_layer_name'), intersecting_geom_count('sand_layer_name') and so on ...

Any change made in the four layers should affect the columns of your NAM_USA layer (after leaving the edit mode of the underlying layers and having saved the edits made + maybe a little map refresh ...)

So nothing is calculated 'manually' ...

share|improve this answer

answered 14 hours ago

snaileatersnaileater

1,911614

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the expression is not seems to be workin in QGIS 2.18.12. currently I have added 4 project variables like Bare_count is written as (layer_property( 'Baresoil' , 'feature_count')). In field expression I use eval(@Bare_count) expression to get the feature counts.
  
  – Keshav Sharma
  13 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  mmm ... QGIS 2.18.12 maybe ... u didn't mention version in your question. i think intersecting_geom_count appeared in a next release of QGIS ... is the use of QGIS 2.18 mandatory for you ? What u have with your expression is a feature count by layer i think u're expecting a feature count by NAM_USA feature (or i don't understand your data structure...)
  
  – snaileater
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I HAVE EDITED THE QUESTION MORE SIMPLY.
  
  – Keshav Sharma
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Really lol ? ... u didn't answer my question : i suppose u're expecting feature count by grid (=NAM_USA feature) ?
  
  – snaileater
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  intersecting_geom_count is part of the RefFunctions plugin, not part of any QGIS version. Install the plugin to get access to this function.
  
  – csk
  8 hours ago
  

  
  
  
  

 | 
show 2 more comments

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0

Not sure i fully understand your question but ... :

In NAM_USA u can populate your 4 fields (bare,sand, woody, built) with the following expression :

intersecting_geom_count('bare_layer_name'), intersecting_geom_count('sand_layer_name') and so on ...

Any change made in the four layers should affect the columns of your NAM_USA layer (after leaving the edit mode of the underlying layers and having saved the edits made + maybe a little map refresh ...)

So nothing is calculated 'manually' ...

share|improve this answer

answered 14 hours ago

snaileatersnaileater

1,911614

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the expression is not seems to be workin in QGIS 2.18.12. currently I have added 4 project variables like Bare_count is written as (layer_property( 'Baresoil' , 'feature_count')). In field expression I use eval(@Bare_count) expression to get the feature counts.
  
  – Keshav Sharma
  13 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  mmm ... QGIS 2.18.12 maybe ... u didn't mention version in your question. i think intersecting_geom_count appeared in a next release of QGIS ... is the use of QGIS 2.18 mandatory for you ? What u have with your expression is a feature count by layer i think u're expecting a feature count by NAM_USA feature (or i don't understand your data structure...)
  
  – snaileater
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I HAVE EDITED THE QUESTION MORE SIMPLY.
  
  – Keshav Sharma
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Really lol ? ... u didn't answer my question : i suppose u're expecting feature count by grid (=NAM_USA feature) ?
  
  – snaileater
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  intersecting_geom_count is part of the RefFunctions plugin, not part of any QGIS version. Install the plugin to get access to this function.
  
  – csk
  8 hours ago
  

  
  
  
  

 | 
show 2 more comments

0

Not sure i fully understand your question but ... :

In NAM_USA u can populate your 4 fields (bare,sand, woody, built) with the following expression :

intersecting_geom_count('bare_layer_name'), intersecting_geom_count('sand_layer_name') and so on ...

Any change made in the four layers should affect the columns of your NAM_USA layer (after leaving the edit mode of the underlying layers and having saved the edits made + maybe a little map refresh ...)

So nothing is calculated 'manually' ...

share|improve this answer

answered 14 hours ago

snaileatersnaileater

1,911614

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the expression is not seems to be workin in QGIS 2.18.12. currently I have added 4 project variables like Bare_count is written as (layer_property( 'Baresoil' , 'feature_count')). In field expression I use eval(@Bare_count) expression to get the feature counts.
  
  – Keshav Sharma
  13 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  mmm ... QGIS 2.18.12 maybe ... u didn't mention version in your question. i think intersecting_geom_count appeared in a next release of QGIS ... is the use of QGIS 2.18 mandatory for you ? What u have with your expression is a feature count by layer i think u're expecting a feature count by NAM_USA feature (or i don't understand your data structure...)
  
  – snaileater
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I HAVE EDITED THE QUESTION MORE SIMPLY.
  
  – Keshav Sharma
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Really lol ? ... u didn't answer my question : i suppose u're expecting feature count by grid (=NAM_USA feature) ?
  
  – snaileater
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  intersecting_geom_count is part of the RefFunctions plugin, not part of any QGIS version. Install the plugin to get access to this function.
  
  – csk
  8 hours ago
  

  
  
  
  

 | 
show 2 more comments

Not sure i fully understand your question but ... :

In NAM_USA u can populate your 4 fields (bare,sand, woody, built) with the following expression :

intersecting_geom_count('bare_layer_name'), intersecting_geom_count('sand_layer_name') and so on ...

Any change made in the four layers should affect the columns of your NAM_USA layer (after leaving the edit mode of the underlying layers and having saved the edits made + maybe a little map refresh ...)

So nothing is calculated 'manually' ...

share|improve this answer

answered 14 hours ago

snaileatersnaileater

1,911614

share|improve this answer

answered 14 hours ago

snaileatersnaileater

1,911614

answered 14 hours ago

snaileatersnaileater

1,911614

answered 14 hours ago

snaileatersnaileater

1,911614