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Results tagged with qgis
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user 59948
QGIS is a cross-platform GIS application licensed under the GNU General Public License.
2
votes
2
answers
7k
views
How to change the active layer in QGIS Console?
I want my script to perform actions on a particular layer. Online advice I've found so far suggests using the iface method "setActiveLayer()". Makes sense based on the name alone.
Scenario: In t …
- 1,217
1
vote
2
answers
1k
views
How to Unselect Features with QGIS tool "selectbyexpression' and the ">" Operator
I'll bet there are more operator symbols than ">" that also don't work with this tool because the "Select By Expression" GUI at the top menu of QGIS only has 9 operator options at the top and ">" isn't …
- 1,217
1
vote
0
answers
522
views
Try/Except Statement gives different Results in QGIS Console vs. QGIS Tool
I want my script to do different things depending on whether a particular layer DOES or DOES NOT exist in the Map Layers list. I thought the try: / except: statements would be the best way to achieve …
- 1,217
6
votes
1
answer
3k
views
Add Values to New Column in Attributes Table using Python Console in QGIS
I've added a new column to my table called "STRNAME" using:
path = "/Users/shapefiles/roads/"
metro_roads = QgsMapLayerRegistry.instance().mapLayersByName('Metro_roads')[0]
processing.runalg('qgis:ad …
- 1,217
2
votes
0
answers
41
views
Processing Tools Help Documentation for QGIS? [duplicate]
I'm used to ArcGIS but am attracted to QGIS for its open source (free) nature. … I realize Esri has the budget for this and QGIS is open source, free, and programmed by volunteers, but without good explanations on how to use QGIS tools how can one expect to master them as much as the …
- 1,217
1
vote
1
answer
1k
views
Determining Layer's DATUM and PROJECTION in "Layer Properties" (QGIS)
I have two layers in a QGIS project: "Layer 1" and "Layer 2". …
- 1,217
6
votes
2
answers
3k
views
Print values from Tables in QGIS Console
Example 2:
>>>fields = vl.pendingFields()
>>>fields.toList()
Output:
[<qgis._core.QgsField object at 0x11f24a770>, <qgis._core.QgsField object at 0x11f24aa68>, <qgis. … _core.QgsField object at 0x11f24ab00>, <qgis._core.QgsField object at 0x11f24ab98>, <qgis._core.QgsField object at 0x11f24ac30>, <qgis. …
- 1,217
5
votes
Check if layer exists in QGIS Project using PyQGIS
boolean = False
layers = QgsMapLayerRegistry.instance().mapLayers()
for name, layer in layers.iteritems():
if layer.name() == ('the_Map_Layer_in_question'):
boolean = True
# if t …
- 1,217
11
votes
3
answers
6k
views
Check if layer exists in QGIS Project using PyQGIS
In QGIS, what is the simplest python code (least possible) to verify if a particular layer is PRESENT or ABSENT in the Map Layers list? …
- 1,217