Questions tagged [array]
An arrangement of quantities, symbols or objects in rows and columns; a matrix
176
questions
6
votes
1
answer
149
views
QGIS - Connection Lines using geometry generator between 2 layers in a relation N-1
I would like to know if there is any way to generate a connecting line between 2 points layers (blocks-points representing a watershed, concpoints-points representing the concentration location of the ...
- 414
1
vote
2
answers
34
views
Raster to Numpy array for aspecified area, search maximum value using ArcPy and numpy
I want to filter the maximum value within a given area using the fastest method possible. I don't want to load the input files (several 100s of full size, classified Sentinel 2 images, integer) ...
- 79
2
votes
1
answer
48
views
Array (Error) Array: Unrecognized type, may only use numbers or lists, found type Array
I am getting this error when trying to subtract the array with its mean value in Google Earth Engine JavaScript API
var from = ee.Array([2,3])
var meann = from.reduce(ee.Reducer.mean(),[0])
var to = ...
0
votes
0
answers
23
views
How to go from ImageCollection to array in GEE including reprojecting and resampling?
I have an image collection of which some images together compose my region of interest (in my case the Philippines) and of which some images overlap because of a different date.
adm0 = ee....
1
vote
1
answer
74
views
Converting array to polyline using Arcade with ArcGIS Pro
Arcade/ArcGIS Pro 2.9:
I have an array of polyline vertices:
[[[670634.3148,4862051.3579,null],[670719.3321,4862051.0072,null],[670721.44381227,4862055.2956567,null],
[670724.26721751,4862059.1529319,...
- 756
4
votes
1
answer
58
views
Advanced labeling in QGIS to automatically get data from new fields and create arrays
I'd like to be able to easily get quick data from different projects I work in in order to avoid having to do sql queries all the time. So here's the thing, today I managed to get the following ...
- 43
2
votes
1
answer
109
views
Unable to write raster from array using rasterio
I have two raster files, raster1 and raster2. I want to take raster1 and divide it by raster2 and produce an output raster for this calculation. I am using python and the rasterio package.
For info on ...
4
votes
1
answer
76
views
Update array geometry field using array lat & long field in PostGIS
I have two array columns in Postgres named lat and long. Both have 1-5 values in their array field. Like the following
Now I need to create geometry from each value based on the array index of lat &...
- 117
9
votes
4
answers
368
views
Sorting alphanumeric array numerically using QGIS Field Calculator
For each street I have a list of house numbers in a column of a CSV file and I need to sort them numerically:
House numbers are separated by -.
name
list
sorted_list
street A
5/A-5-4-8-3-6-9-7-1-10-...
- 3,627
3
votes
2
answers
108
views
Comparing arrays in QGIS
I want to compare two arrays and if they match exactly a specific value should be assigned to a field. For instance, if the values in "sumEHZ" are [A,B] or [B,C] the lower value should be ...
- 1,444
0
votes
1
answer
189
views
Loading data from array in popup when country is clicked in React Leaflet
I'm newbie and I have interactive web in react using leaflet library and now I need to load "title" data from array to a map. So when I click on some country, popup will show up with this ...
- 31
4
votes
4
answers
453
views
Replacing strings from multiple array elements delimited by commas in QGIS
In QGIS 3.18, I have a vector layer of 1000+ features with 100+ attributes, many of which are strings of concatenated elements (substrings) delimited by commas. Some of those elements need to be ...
- 1,001
1
vote
2
answers
96
views
How to create a NetCDF file with Albers conical equal area projection in Python
I was wondering how to create a NetCDF file with the following dimensions and variables;
<class 'netCDF4._netCDF4.Dataset'>
root group (NETCDF4 data model, file format HDF5):
Conventions: CF-...
- 35
0
votes
0
answers
186
views
Ploting GEE image with imshow and adding an cartopy.io.img_tiles using add_image
I transformed a GEE image in an numpy array and I'm trying to plot a this array using plt.imshow() with a background image of cartopy image tiles (cimgt) with .add_image(). However, the array and ...
- 3
4
votes
3
answers
258
views
Get more than one elements from array in QGIS expressions using square brackets
Using QGIS expressions, if you have an array, you can get the n-th element by simply adding a number (n) in square brackets (starting with 0 for the first element). Like this, array (1,2,3,4,5,6,7,8)[...
- 40k
0
votes
0
answers
67
views
Using ArcPy cursor to insert polyline
I'm trying to use an InsertCursor to write code where I insert a line segment from two points in the shapefile, but I keep getting a type error explained below
import arcpy, os, traceback
fc = 'C:/...
- 69
0
votes
0
answers
15
views
How to remove an object from an array in MongoDB?
I have the following document in MONGODB.
{
"_id": 7000,
"vehicle": "QEE 185",
"driver": "30375703",
"drivername": "Robin",
"...
0
votes
1
answer
172
views
Creating a dependent drop-down list in Google Earth Engine [duplicate]
I am trying to create a dependent drop-down list in Google Earth Engine that will respond to the input from the first list. I am basing this off an example provided by Google Developers... https://...
- 127
3
votes
2
answers
228
views
Array for_each in QGIS
Is there an expression in QGIS for array for_each to get the element from the output of geom_to_wkt($geometry) of the polygon and correspondingly transform the element (using the expression of LAT ...
3
votes
2
answers
138
views
Compare strings, extract unique values from one (QGIS)
In QGIS 3.18. I am looking for a field calculator expression able to return the values of a string (comma separated) in Field B which are not* also values of a string in Field A. For example:
Field ...
- 1,001
0
votes
1
answer
37
views
Displaying regions from a list in GEE
I have generated a list with States of India but getting the following error while trying to display a region on the map.
Line 11: centerObject() requires a Geometry or Element. Got: Karnataka
'...
- 27
0
votes
0
answers
132
views
Acquiring data point coordinates from Geotiff and converting to numpy array
I would like to use scipy.interpolate.griddata to interpolate my Sentinel-1 products (see two sample images below) taken from different orbits resulting in having the uniform datapoint coordinates.
I ...
- 183
0
votes
1
answer
44
views
Flipping range of values in array or raster
I have a continuous raster with a range of 0.135 - 0.921 and I want to flip the range or invert it, so the values are min becomes max and max becomes min. I've tried using np.flip() but that results ...
- 419
1
vote
0
answers
31
views
ArcPy: Populating array column with rank values
I am trying to get the rank values for some values in my fields. I have created an array from fields of an attribute table, sorted them in descending order, and I now want to populate the third column ...
- 29
3
votes
1
answer
101
views
QGIS expressions: remove several elements at once from an array
The problem
Using QGIS expressions with QGIS 3.20, I have an array and I want to exclude a number of elements from this array. Let's say my array is [1,2,3,4,5,6], but I want to get an array like [1,2,...
- 40k
0
votes
1
answer
99
views
Get Numpy array from SHAPE@WKB token
I am trying to get a numpy array from the SHAPE@WKB token that is obtained either using FeatureClassToNumpyArray or cursors, however what I get does not make much sense.
Specifically I am interested ...
- 69
0
votes
1
answer
65
views
Python array based alternative to GRASS r.cost
I am looking for a numpy array based alternative to the GRASS r.cost function.
I have a friction surface raster where the value of each cell corresponds to travel time. I would like to find the cells ...
- 1
3
votes
1
answer
51
views
How to count number of attributes and then link back to road network - pgrouting
I have created generated a many-to-many shortest distance route using pgRouting. The output table displays the typical pgRouting outputs (seq, path_seq, edge, node, cost etc.) as well as the road ...
0
votes
0
answers
91
views
Visibility Analysis Plugin (QGIS 3.18.3) Returning multiple errors
I am trying to run a viewshed analysis in QGIS 3.18.3 using the Visibility Analysis plugin. I have followed the steps entirely in both of these videos:
https://youtu.be/pt1gFXON7W4
https://youtu.be/...
- 1
0
votes
0
answers
45
views
Is there a way for apply point.distance on an array instead of doing double for loop?
I am using the code below to find a distance between one point and a line, but I have a grid of points, and I want to optimize it so I don't have to do double for loop. Is it possible to apply point....
- 1
1
vote
1
answer
32
views
Calculating a single number fra an array in field calculator using other fields
For my final project, I would like to assess the earthquake risk of populated areas in California. For this I have two multipolygon layers containing data for Earthquakes, and populated areas ...
3
votes
1
answer
77
views
Calculate the sine of a raster in the power of y / Python
I have this code and my aim is to calculate the sine of my raster in the power of 0.8.
import os
os.chdir('D:/NOA/Soil_Erosion/test_Project/Workspace/Input_Data_LS_Factor')
import rasterio
...
7
votes
2
answers
262
views
How to handle the "allow multiple selections" in "Value Relation Widget" results? (QGIS Form)
Using the "allow multiple selections" in "Value Relation Widget" results in {value1,value2,...}. But arrays in QGIS are written like ['value1','value2',...]. How do I handle the ...
- 7,653
0
votes
1
answer
125
views
Searching a value from lists, get repeated results and append results to list in Google Earth Engine
Before, I asked that for search or filter values in two-segment list in Google Earth Engine at this link(Search or filter values in two-segment list in Google Earth Engine) and this question is ...
1
vote
1
answer
29
views
Having trouble concatenating with Arcade across fields and having No Data when all columns are empty
I have data that needs to be in a pop-up that is contained across several fields. If the fields have no data, I would like the pop-up to say "No Aviation Resources". Here is what I have so ...
- 11
1
vote
2
answers
143
views
Aggregating elements of array using QGIS
In QGIS 3, are aggregate functions over a set of array elemnts possible?
As simple as in the form of:
aggregate(array:=array(1,2,3), aggregate:='mean')
I'd use it for the task to get an average for an ...
- 1,806
0
votes
1
answer
40
views
Convert Image Band Values from Array into Number
I am trying to convert the pixel values that appeared to be an array (see the snapshot below) into numeric. In its current state, every time I tried implementing reduction, I got an error:
Input to ...
- 93
3
votes
1
answer
208
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?
1
vote
0
answers
17
views
Comparing two same-shape band arrays, one against a set of conditions to then change the other one
first band and second band can be assumed to be the same shape.
I want to test the second band against two conditions (that it's not "invalid_data" and the value is one of the numbers in &...
- 33
4
votes
1
answer
319
views
Using PostGIS to find the overall difference between two (large) polygon datasets
I need to get the Difference of an input layer with ~30k polygons and an overlay layer with ~500k polygons (of which ~200k intersect the input layer).
I am trying to learn PostGIS to do this, as it ...
- 155
1
vote
1
answer
725
views
Convert a large RasterStack to Array in R
I am trying to transform a large RasterStack to an array in order to compute some extraction. The classical approach raster::as.array() is not working since the files are very large and it's taking ...
- 51
2
votes
1
answer
264
views
Converting 2D array image to table using Google Earth Engine
I'm trying to get a table from a 2d-array image. Basically, the Image (called segmentationInfo) looks like this:
The 2-D ‘LandTrendr’ annual segmentation array looks like this:
[
[1985, 1986, 1987, ...
- 237
3
votes
1
answer
165
views
Automatically create an array of all visible layer names in QGIS
How can I get an array of all visible layer names automatically using QGIS expressions? In principle it should work with the variable @map_layers. Using the following expression works fine for what I ...
- 40k
1
vote
1
answer
100
views
Convert a 2D list of numbers to a ImageCollection with constant values in Google Earth Engine
I have climate indices values as lists and I tried to make the lists into an imageCollection.
However, when I tried to use map function,
var climate_indices = ee.ImageCollection.fromImages(
years....
- 21
1
vote
0
answers
437
views
Using a shapefile as mask with rasterio mask gives different affine transforms with rasters of the same projection and resolution
I have a list of n file paths to geotiffs of the same resolution and projection but with varying extents. In brief the goal is to
use Rasterio's mask module to use a shapefile containing a single ...
- 167
6
votes
1
answer
1k
views
QGIS - Expression to aggregate values from an array
In a calculated field in QGIS 3.10.2 I wan't to aggregate values from an array field. For this aggregation I'm using a filter to compare matching id's and return value from another field. I can ...
- 1,305
2
votes
0
answers
65
views
Defining an array as a variable in QGIS
I want to use array_first(@myArray) to get the first value of myArray in a data defined box.
myArray is defined in the project variables, but I can't find the correct syntax. I tried :
(1, 2, 'abc')
[...
- 1,035
4
votes
1
answer
243
views
Join on field with multiple values
I have a field "istat" that contains multiple values of the istat code (municipal code):
and a table containing the centroids of the municipalities
I am looking for a way to join the &...
- 874
2
votes
1
answer
121
views
Commit error when splitting several polygons with "array type" attribute (PostGIS / QGIS)
I have a simple PostGIS table :
CREATE TABLE public.elem_p
(
gid integer NOT NULL DEFAULT nextval('elem_p_gid_seq'::regclass),
liste character varying[] COLLATE pg_catalog."default" ...
- 161
1
vote
0
answers
244
views
Save the array labels in a new array [closed]
I have several arrays obtained from K means, each array contains a variable number of classes, e.g. from -1 to 3, from 0 to 4, from -1 to n. I would like to be able to save each class of an array as a ...
- 365