Diskussion:Workshop QGIS Python GeoPython 2017: Unterschied zwischen den Versionen
Stefan (Diskussion | Beiträge) K |
Stefan (Diskussion | Beiträge) K |
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| − | + | See also | |
| + | * https://github.com/simran001/PyQGIS_workshop | ||
* https://etherpad.coredump.ch/p/Python-Workshop | * https://etherpad.coredump.ch/p/Python-Workshop | ||
| + | |||
| + | ''Custom Python Expression Functions for QGIS'' | ||
Possible examples: | Possible examples: | ||
| − | * | + | * Function reading from other feature properties |
| − | * | + | * Function reading from other layers (1:1) |
| − | * | + | * Functions aka "Singletons", like layer properties or sequence |
| + | * Function for remote webservice: geocoding (reading from the internet) | ||
| + | |||
| + | Restrictions: | ||
| + | * Relationship other than 1:1 | ||
| + | * Reading data from another layer (without own iterator and accessor) | ||
| + | * | ||
| + | |||
| + | Workflows | ||
| + | * QGIS Basics: Processing data with files, virtual layers, or realtime (= functions) | ||
| + | * How to handle own projects, plugins and functions? | ||
| + | |||
| + | |||
| + | Notes: | ||
| + | |||
| + | Add attributes from a layer in the project or an external file (csv) to a layer (or the composer?) using insert expression? Create a custom expression python function to do this: | ||
| + | http://nathanw.net/2012/11/10/user-defined-expression-functions-for-qgis/ | ||
| + | |||
| + | How to import a user defined expression functions on QGIS start up. => Add them to qgis2/python/startup.py | ||
| + | |||
| + | Given polygon layer and a point one, calculate for each polygon feature, the number of points that it covers: https://lists.osgeo.org/pipermail/qgis-user/2016-October/038139.html | ||
| + | http://gis.stackexchange.com/questions/212415/referencing-to-features-geometry-in-an-expression/212762#212762 | ||
| + | |||
| + | Automatic Field Calculator Plugin: http://plugins.qgis.org/plugins/AutoFields/ | ||
| + | |||
| + | Expressions Plus Plugin - Extra functions for the expression engine which didn't make it into 2.0: https://plugins.qgis.org/plugins/qgsexpressionsplus/ | ||
| − | + | Resource Sharing Plugin (http://plugins.qgis.org/plugins/qgis_resource_sharing/) | |
| − | + | E.g. https://github.com/mara91/qgis_styles.git | |
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Version vom 9. März 2017, 11:35 Uhr
See also
Custom Python Expression Functions for QGIS
Possible examples:
- Function reading from other feature properties
- Function reading from other layers (1:1)
- Functions aka "Singletons", like layer properties or sequence
- Function for remote webservice: geocoding (reading from the internet)
Restrictions:
- Relationship other than 1:1
- Reading data from another layer (without own iterator and accessor)
Workflows
- QGIS Basics: Processing data with files, virtual layers, or realtime (= functions)
- How to handle own projects, plugins and functions?
Notes:
Add attributes from a layer in the project or an external file (csv) to a layer (or the composer?) using insert expression? Create a custom expression python function to do this: http://nathanw.net/2012/11/10/user-defined-expression-functions-for-qgis/
How to import a user defined expression functions on QGIS start up. => Add them to qgis2/python/startup.py
Given polygon layer and a point one, calculate for each polygon feature, the number of points that it covers: https://lists.osgeo.org/pipermail/qgis-user/2016-October/038139.html http://gis.stackexchange.com/questions/212415/referencing-to-features-geometry-in-an-expression/212762#212762
Automatic Field Calculator Plugin: http://plugins.qgis.org/plugins/AutoFields/
Expressions Plus Plugin - Extra functions for the expression engine which didn't make it into 2.0: https://plugins.qgis.org/plugins/qgsexpressionsplus/
Resource Sharing Plugin (http://plugins.qgis.org/plugins/qgis_resource_sharing/) E.g. https://github.com/mara91/qgis_styles.git
