Questions tagged [list]
Linear collection of items
36
questions
16
votes
2
answers
21k
views
Getting list of layer names using PyQGIS [duplicate]
I need a list containing the names of all the layers in a QGIS session. I did the task as
layersNames = []
for i in self.iface.mapCanvas().layers():
layersNames.append(str(i.name()))
but this has ...
30
votes
8
answers
27k
views
Getting list of distinct values from shapefile field using QGIS
I have a shapefile whose features I can filter by specifying a where clause in the query dialogue. F.x. I have a field named "city_name" and by stating "city_name" = 'London' in ...
10
votes
3
answers
14k
views
Getting attributes of selected features using PyQGIS
Could anybody provide an example how to get the attributes of selected features?
I tried the following code in the Python Console : but I'm stuck at the point where I'd like to get the attributes:
...
6
votes
1
answer
3k
views
Getting list of layers names using PyQGIS
To get the list of TOC layer names I used the approach suggested here:
for layer in QgsMapLayerRegistry.instance().mapLayers().values():
print layer.name()
But this method is not reliable due to ...
7
votes
1
answer
7k
views
Google Earth Engine: Extract values from FeatureCollection as list
I'm trying to extract values from a FeatureCollection as a list. Here's some example code that I'm using in Earth Engine's code editor:
var viirs =
ee.Image('NOAA/VIIRS/DNB/MONTHLY_V1/VCMCFG/...
3
votes
1
answer
615
views
Grouping and sorting a list of equipment using an aggregate function in the print composer
I'm using QGIS as a spatial database for a construction site and we are now checking the installed equipment. The inspection requires us to have a list of the equipment ID to inspect for each type of ...
3
votes
1
answer
1k
views
Field list in combobox in pyqgis
I'm new to pyqgis and I'm tryig to make a combobox with list of fields (from layer also selected in combobox).
layers = self.iface.legendInterface().layers()
layer_list = []
for layer in ...
1
vote
1
answer
511
views
Sum new values to existing attribute values in PyQGIS?
I'm trying to sum new values from a list in one loop to the existing attribute values (not in a new column, but in the exiting attribute values itselfs).
def radiusDivider(dist):
try:
itlayer = ...
10
votes
6
answers
3k
views
Is there a faster way in python of finding the smallest number in a field?
Using arcgis desktop 10.3.1 I have a script which uses a search cursor to append values to a list and then use min() to find the smallest integer. The variable is then used in a script. The Feature ...
10
votes
1
answer
3k
views
Listing project layers in standalone PyQGIS script
I'm trying to load an existing .qgs project and get a list of the layers inside. I seem to be able to open the project, but I can't get the list of layers. I'm a little confused as to the basic PyQGIS ...
7
votes
2
answers
490
views
Understanding *coords meaning when used with ArcPy?
What does *coords in the following code mean?
import arcpy
feature_info = [[[1, 2], [2, 4], [3, 7]],
[[6, 8], [5, 7], [7, 2], [9, 5]]]
features = []
for feature in feature_info:
...
6
votes
2
answers
298
views
Writing list as attribute field in PyQGIS
This answer got me close https://gis.stackexchange.com/a/286780/204059, but I only get the last value of my list for all object fields.
Example: My list = [REL_1, REL_2, REL_3]. My layer has three ...
6
votes
3
answers
9k
views
Extracting data using arcpy.da.SearchCursor?
I have a shapefile of point features showing fire locations in a given year. One of the fields is named "YYYYMMDD" and indicates the corresponding date that that fire happened. In Python, I am trying ...
6
votes
1
answer
4k
views
How can I rename multiple feature classes (each different name) using Python?
I have a geodatabase including (cnty06,cnty07,cnty08,cnty09...) that I'd like to rename to (c06,c07,c08,c09...). I can use the ModelBuilder (or script from ModelBuilder) to complete this task. Is ...
5
votes
2
answers
5k
views
Where is list of Geographic Transformations in ArcGIS, and their areas of applicability?
I have some data in Provisional South American Datum 1956, and I need to project it to Web Mercator with WGS84 as the datum.
When I use the project tool in ArcGIS desktop, it requires a Geographic ...
5
votes
4
answers
948
views
Creating list from field values with PyQGIS
How is it possible to create a list from the values of a single field in a shp using PyQGIS?
Example:
field_capital_name
London
Paris
Rome
list1 = [London, Paris, Rome]
4
votes
1
answer
3k
views
Getting list of all data sources used in ArcGIS Pro project
Is there a way to generate (or access) a list of all data sources used in a ArcGIS Pro project?
I would like to avoid going through each layer's property dialog.
4
votes
1
answer
1k
views
Create a new list from a raster list in R
I am very new to R, so this is tough for me to explain. But, I have a raster list made up of 3872 elements (or separate rasters, I am guessing) and I am hoping to make a new smaller raster list by ...
4
votes
2
answers
5k
views
Unique List of Image Dates from Image Collection in Google Earth Engine
I would like to create a list or array object containing a unique set of dates represented in an image collection for a given region of interest. I have a function that extracts and converts dates for ...
4
votes
1
answer
464
views
How to sort multi-column lists by first or second column in Google Earth Engine
I have a list with two-segment.
var list = ee.List([
[101, 102],
[102, 103],
[103, 104],
[106, 100],
[104, 105],
[105, 106],
])
How can sort this list by first or second column?
4
votes
5
answers
5k
views
Finding the index of a field with its name using arcpy
I want to extract the index of a field with its name using arcpy. It seems what I have written is so dumb. Is there any simpler method with out using for-loop?
import arcpy
fieldList = arcpy....
3
votes
1
answer
837
views
How to Geocode a list of address into a map in qgis?
I have a list of country and city capitol on a Excel, and I want to upload them into a map in QGIS?
3
votes
1
answer
2k
views
How to load an image asset from a list of assets in the folder?
I have a folder in my Assets that contains 44 images.
I want to add them to the Map in sequence. However I'm getting an error that I can only create an image that is a constant.
var image = ee....
3
votes
1
answer
74
views
AttributeError when creating list field with QVariant in QgsVectorLayer using PyQGIS
I am trying to create a list-type field for the active layer using the code below, which is not working.
Is there any other way to create a list-type field and update the list([1,2,3]) as an attribute ...
2
votes
1
answer
290
views
Returning strings showing all vertices from all polygons in shapefile using ArcPy?
I want to have a string showing all vertices from all polygons in a shapefile. In my example below my code lists all vertices and the first column shows the polygon they are part of (I only have 2 in ...
2
votes
1
answer
1k
views
How to open a list of images from an asset as an Image Collection?
I need to create an Image collection from a list of images that I import from an asset in GEE. This is the code I am using:
//THE CREATION OF A IMAGECOLLECTION WORKS WITH TWO IMAGES LOADED HERE
var ...
2
votes
1
answer
295
views
Search or filter values in two-segment list in Google Earth Engine
i have a two-segment list;
var list =ee.List([[101,12155],[102,12157],[103,12158]])
i want to search or filter for 102 and get result (12157), for 103 and get result(12158)
How can i do it ?
i find a ...
2
votes
1
answer
1k
views
QGIS 2.14 GRASS geoalgorithms don't work?
I instaled qgis 2.14 and grass geoalgorithms dont work. Only 160 geoalgorithms and should be 168. MsBox: Missing dependensy, It seems that GRASS is not correctly installed and configured in your ...
2
votes
2
answers
256
views
Identify and move data containing special characters to a separate column
My dataset contains special characters. I want to identify the data which contains special characters and separate it into a new column.
List of special characters :
`~!@#$%^&*_{}[]<>?/
...
1
vote
1
answer
213
views
How to make a linked-list in Google Earth Engine?
Now, after Noel Gorelick's very helpfull code, i have a sorted list with two-segment:
var list = ee.List([
[101, 103],
[102, 103],
[103, 109],
[109, 122],
[117, 156],
[122, 133],
[133, ...
1
vote
1
answer
2k
views
Subquery a list in select layer by attribute management using python
I am new to python and having trouble with my script.
I want only the records from the COMTRS field (of the pur_dbf_view) that match values from the ComtrsList to be selected; however, I am getting ...
1
vote
1
answer
711
views
Making combobox with list of fields (from layer also selected in combobox) in pyQGIS? [duplicate]
I am new to python and pyqqis.
I do not have the methods defined in initGUI
how do I do?
layers = self.iface.legendInterface().layers()
layer_list = []
for layer in layers:
layer_list.append(...
1
vote
2
answers
8k
views
Earth Engine get dates from imageCollection
I try to get all acquisition dates of my ImageCollection in Google Earth Engine Code Editor.
var begin = ee.Date.fromYMD(2017,1,1,'Europe/Berlin');
var end = ee.Date.fromYMD(2018,1,1,'Europe/Berlin');...
0
votes
1
answer
463
views
problem with list.files() in R
here you have my data https://www.eea.europa.eu/data-and-maps/data/corine-land-cover-accounting-layers. I downloaded "CLC2000 Accounting Layer " file and "CLC2018 Accounting Layer" ...
0
votes
1
answer
215
views
List the fields for every shapefile I have stored in a list
I am trying to list the fields for every shapefile in 2 lists I have created to prove that each shapefile with the correct projection/feature type within one of the lists got X, Y coordinates added to ...
0
votes
1
answer
339
views
Split list by chunks Earth Engine with mean
I am calculating mean temperature data based on historical data. I need to calculate the mean through the years (jan-jan-jan-jan...) and the means within a year (jan-feb-mar-may-jun...).
This is ...