Questions tagged [array]
An arrangement of quantities, symbols or objects in rows and columns; a matrix
205
questions
0
votes
0
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21
views
Generate and populate a grid from points in a geopandas dataframe [duplicate]
Context:
I have a geopandas dataframe, with two columns
'geometry': full of shapely.geometry.point.Point.
'h_mean': gathering the height of a surface at those points
I want to create a 2D spatial ...
- 143
1
vote
0
answers
32
views
How to use the field calculator array_mean() function in Python console QGIS
I have a layer with USA counties; each county has a unique identified 'COUNTYNS' and a field "CO_mean_microg_m3". Some counties have this CO value as NULL, so I want to take the 6 nearest ...
0
votes
0
answers
27
views
Align the points in polygon
I have two datasets consits of building footprints and point data.
Points are within the footprint but they are scattered. Is there any tool to align them perfectly within the polygon as pattern.
...
- 769
1
vote
1
answer
44
views
Convert RasterStack object to Array and Array to RasterStack
I have a RasterStack object. I need to convert it into an array and then convert this array into a new RasterStack.
library(raster)
Here a RasterStack example:
m <- raster(ncol=10, nrow=10)
values(...
- 1,084
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votes
0
answers
21
views
gdal.Warp reading 2d multichannel array incorrectly - loading bands (3) as the y axis
We have a python script that downloads NOAA GOES satellite NetCDFs, and processes the image datasets via Pillow\OpenCV. Then I convert it back to a GDAL dataset in order to translate and warp. With a ...
0
votes
1
answer
140
views
Convert WRF NetCDF to TIFF
I have a NetCDF file, output of a WRF model, which contains a time series of some variables. You can download it here (Warning: 7GB download). Here is the gdalinfo output:
Driver: netCDF/Network ...
- 49
4
votes
2
answers
513
views
Unesting JSON array in SQLite [closed]
I'm using DB Manager on QGIS to write a view. I want to "translate" unnest() SQL function, but I don't find the same in SQLite.
SQL
SELECT unnest(ARRAY['A','B','C']);
unnest
A
B
C
The ...
- 1,566
1
vote
1
answer
133
views
Filling in attributes from a different layer in QGIS batch mode
I have a point layer with an X,Y field, containing the coordinates of each point separated by a comma.
I'm trying to batch process r.water.outlet based on these X,Y values from a different layer, the ...
- 13
1
vote
2
answers
101
views
PostGIS ST_Union using array of geometries
I'm new to PostGIS and I have a set of layers that need to be merged and dissolved. I have no problem doing this for 2 input layers using ST_Union(geometry g1, geometry g2), but for more than 2 layers,...
- 41
2
votes
1
answer
104
views
Make a polyline shapefile out of a mask, but do not count the boundaries of the array in the polyline
I have 3 DEMs that I mask: non-NaN values = True and NaNs = False.
I have an algorithm that plots the boundaries of the masks, but the issue is that it also plots the boundaries of the array of the ...
- 143
2
votes
1
answer
128
views
'Invalid GeoJSON geometry' error while exporting an array as CSV in Google Earth Engine
My variable array1 is a list of objects. I am trying to export this list as a table in Excel to do work on that. However, the error I am getting is this:
Line 184: Invalid GeoJSON geometry: {"...
- 21
1
vote
0
answers
62
views
Inserting time dimension into 2d array (lon, lat) to create 3d array (time,lat,lon)
I'm trying to create a 3d array with 'time, lat, and lon' dimension. My data is from trmm 3b42 v7. Can someone help me with what should I do. The following are the codes I created.
from netCDF4 import ...
0
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0
answers
44
views
Google Earth Engine error -- 'array: parameter values is required'
I'm using the monitoring vegetation condition code, and when running I get an error 'array: parameter values is required'
This is the code I'm using:
// Get MODIS 250m vegetation data.
var mod13 = ee....
0
votes
1
answer
155
views
How to download a image array in Google Earth Engine?
I'm trying to export an image array produced by the ee.Algorithms.TemporalSegmentation.Ccdc algorithm. This is a 1D image array. I'm trying to export it using:
Export.image.toDrive({
image:...
- 1,084
1
vote
0
answers
234
views
How to fix Google Earth Engine ee.Image.getDownloadURL inconsistent output array dimensions
ee.Image.getDownloadURL(..., {'dimensions': '100x100', ...}) occasionally returns arrays with shape (101, 100) or (101, 100) or (101, 101) instead of the expected (100,100). I can't explain it since ...
- 23
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0
answers
65
views
Backward transformation of georeferenced image: from GeoTIFF to TIFF
What's the processing procedure to realize a backward transformation, from a GeoTIFF image to its native array of pixels?
Do you have any suggestion?
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0
votes
2
answers
155
views
Iterate through multiple arrays from several folders and perform calculations
Iterate through multiple arrays, each having multiple arrays
I have three folders, each containing 675 NumPy arrays. I want to iterate over each array in each folder.
My first folder is “Barleyarea,” ...
3
votes
2
answers
96
views
How can cumulative point data be labelled in QGIS?
With the following code I can generate a listing. However, the entire list is displayed and not the data of the attribute of the respective geometry.
'Schäden: '||
array_to_string(
array_agg(
&...
- 51
0
votes
1
answer
107
views
Print chart error: "User memory limit exceed"
I tried to plot the SAR backscattering vs the Crop Water Stress Index using the following code:
var CWSI= ndvi.add(ndwi).rename('CWSI')
print('CWSI',CWSI)
Map.addLayer(CWSI.clip(Hoshiarpur),{},"...
- 69
4
votes
1
answer
230
views
Translating array into list or map and back in QGIS
Arrays in QGIS look like:
[ 'WID00037-LDB', 'WID00027-LDB', 'WID00026-LDB' ]
This kind of List or Map generated by QGIS Value-Relation Widget look like this:
{ "WID00037-LDB", "...
- 8,196
4
votes
1
answer
103
views
Numbering row based on date field in QGIS [duplicate]
In QGIS 3.28 I just want to create a row number (Column "Número") based on the date of the column on the left ("Fecha"), I'm sure it's pretty easy but I'm completely new.
@...
1
vote
0
answers
37
views
Finding lowest and second lowest values within selection, using expressions QGIS 3.24
I need to calculate the closest and second closest point in one layer, measured from points in another layer. I have used Qgis Network Analysis "OD Matrix as table from layers" which gives ...
- 81
0
votes
0
answers
56
views
Unknown CRS of python script output file
I have a set of .tif files which are georeferenced to the CRS EPSG:32632. A sequence of gdal:rastercalculator operations are perfomed. At this point, the output files are still properly georeferenced ...
- 23
0
votes
0
answers
59
views
How to correctly merge 2D and 1D arrays in Google Earth Engine LandTrendr outputs?
I follow LandTrendr guide to make temporal segmentation of Landsat time series for a given area.
I try to merge 'LandTrendr' output (2D array, where 0 axis means 4 rows with data, and 1 axis means ...
0
votes
0
answers
153
views
Create raster from numpy array with boundaries
Working on creating a raster with a constant value for all pixels for land with python. A sample raster is read to get the projection, geotransformation for the the new raster. The raster has the US ...
- 1
1
vote
0
answers
179
views
Change values of pixels of a GeoTIFF in Python with conditions
I would like to change the values of pixels based on some conditions. I am using rasterio and python to modify the values.
This is what I am doing
import nunpy as np
import raterio
def changeLabel(arr)...
- 259
1
vote
1
answer
57
views
Reading and storing 1st pixels from multiple rasters
I want the code to read 1st pixel from a bunch of rasters (for eg. 1st pixel from 6 different rasters (having same extent and same number of pixels) and convert it into array followed by reading 2nd ...
- 51
0
votes
1
answer
373
views
Reading multiple rasters in folder
the rasters in that folder has dates in the naming (for eg. T43RGP_20220330T052639_NDVI) and I want the code to read the rasters one by one in the increasing order of the date.
Help me complete this ...
- 51
-1
votes
1
answer
201
views
Calculate sum of comma separated decimal values in QGIS [duplicate]
The field has decimal values separated by comma and I want to find the sum of those values.
When I run the below code
if (
lengths is NULL,
NULL,
array_sum (
array_foreach (...
- 19
1
vote
2
answers
128
views
Array transformation: RasterStacks of time-series into Array of matrices
I have 9 RasterStacks with 65 layers containing time-series of satellite imagery. Each stack contains a time-serie of each Sentinel-2 band (B2, B3, B4, B5, B6, B7, B8, B11 and B12). The shape of the ...
- 1,084
4
votes
1
answer
228
views
Filter array with a field value
I need to filter filenames (like DJI_0147_3_5.jpg) in an array, and the code below works, but, where you see a 3 in regex, I need instead a field value.
In the array output (sourcefile field) we have ...
3
votes
1
answer
1k
views
Converting column with LineString geometries to np.array
I have a GeoDataFrame of a street network with the geometry of each row as a LineString. Say something like:
type id tags geometry lanes bridge name highway
0 way 34953479 {'...
- 315
2
votes
2
answers
428
views
GEE: Export an Array into a Table
I have created an array with the results of a Pearson correlation between image bands.
I want to convert that array into a properly structured Table.
Currently, I am able to export it, but the output ...
- 155
7
votes
1
answer
308
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 ...
- 434
1
vote
2
answers
178
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) ...
- 81
2
votes
1
answer
232
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 = ...
2
votes
1
answer
355
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,...
- 1,114
4
votes
1
answer
186
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
3
votes
1
answer
753
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
454
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 &...
- 167
9
votes
4
answers
686
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-...
- 4,315
3
votes
2
answers
218
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 ...
- 1,472
0
votes
1
answer
704
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 ...
- 43
4
votes
4
answers
770
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 ...
- 1,051
1
vote
2
answers
312
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
1
vote
0
answers
664
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 ...
- 13
4
votes
3
answers
676
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)[...
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0
votes
0
answers
400
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
1
answer
528
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://...
- 139
3
votes
2
answers
684
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 ...
