Questions tagged [loop]
A sequence of instructions that repeats either a specified number of times or until a particular condition is met.
377
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Issue using while loop in Google Earth Engine
I am trying to write an iterative procedure using the GEE Code Editor. I initially calculate a variable "AR" and if this variable is greater than a specified threshold, then an iterative ...
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2
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72
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Loop an operation in all features
I have a layer that has date and time information and I need the difference between this information in seconds, I managed to get close to this but I needed to loop for the difference between the ...
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How to add attributes to a raster stack
I have a dataframe ("DataGroup"), which holds tracking data from individual birds. Each bird has a unique id ("ID"), and belongs to one of 10 study groups ("DGroup").
In ...
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Repeat a process for several .csv files (containing points) in Google Earth Engine
I need to extract the time series of estimated NDWI from LANDSAT for three year (2020-2022) all around the word. I have to do this process over a regular grid (9-km) and I noticed that the process ...
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Create polygons using a loop in virtual layer
I would like create singlepart polygons including polygons from layer Polygons which have the same value in their row unique_number, and fill the spaces in between.
It will result several polygons : 1 ...
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2
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Looping area calculations for multiple rasters in R
The following code works great on individual rasters and gives me the information that I want:
r<-rast("LuckSpring_2001.tif")
activeCat(r)<-"Class_name"
r
f <- freq(r)
f$...
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317
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Data extraction for time series, transform multiple netCDF files to spatRaster with terra in R
I would like to extract data from around 13,000 .nc files to create a time series of temperature global data in R. Each of my files contain a day worth of data of global SST (my variable of interest) ...
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Error when running loop to section out data in R
I am attempting to run a loop in R that looks at home ranges of 27 individual animals by individual and by year.
I tried running this code:
df <- read_csv('animaltelemetry.csv')
df<-data.frame(...
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24
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Looping through points in an image to find date range with highest cumulative rainfall
New to GEE and confused about difficulty of iterating through items. I want to find the planting season, which is very location specific, and I define it as the 90 day period at a given location with ...
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60
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Make a loop for daily snowdepth in Google Earth Engine
This code gives me the snow depth less than 0.0254 for each day in 2021, as 0 and 1 (0 means snow depth greater than 0.0254 and 1 means snow depth less than 0.0254) but, at the end, I want an image ...
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How to create a function or loop to import training data for several regions in GEE at once
For several supervised classifications I want to assign training data from one feature collection to several regions, for which I have a quality mosaic each.
My dataset for the feature collection ...
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113
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Calculating dNBR for Image Collection in GEE
I'm trying to calculate the differenced normalized burn ratio (DNBR) values for a Landsat image collection in Google Earth Engine for detect fire date and measure burned area using the following code; ...
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107
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Multiply two rasters in R, one raster has stack of 25 images, and another raster has one image
I want to multiply two rasters (one has 25 images, and the second raster has 1 image). I am using the loop function for multiplication. But I am not getting the results.
library(raster)
library(rgdal)
...
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1
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48
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Create several imageCollections with individual names in a loop in GEE
I am trying to create imageCollections for several regions in a loop in GEE.
I am struggling with assigning them to individual variables which are available after exiting the loop. So far, after ...
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Loop a model on input list
I built a model that takes as input - among others - a string value of a road_id. It executes various operations on different layers performing joins and many other tasks. The model is built in such a ...
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Arcpy - loop through files in 2 folders to calculate multiple NDVI files
I am trying to calculate multiple NDVI files from multiple red band files and NIR band files in 2 separated folders with the following code using python:
import arcpy
from arcpy.sa import *
# set ...
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117
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Loop over an asset export task (GEE Python API)
I have a collection of shapefiles (plots of land), for each of which I'm first generating a time series of Sentinel SAR-1 images and then running a change detection algorithm over that time series. I ...
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2
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228
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FME Loop: Many to many connection
I have two tables with lines.
The 1st table has an attribute end_point
The 2nd table has an attribute start_point
I want to join the first table with the second table (end_point = start_point).
It ...
3
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1
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70
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Custom ST_MultiSplit PostgreSQL function error, to split one layer with another
I have a lines layer which I would like to split with a points layer.
I first created the a ST_MultiSplit function:
CREATE OR REPLACE FUNCTION ST_MultiSplit(geom Geometry, blades Geometry) RETURNS ...
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1
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68
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ArcPy UpdateCursor - Adding different text to more than one row of a shapefile entity
I have the following code, which adds a field, and then a value to a row:
import arcpy
V1 = r"path/shapefile.shp"
# Add CODE field
arcpy.AddField_management(V1, "VERTEX", "...
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1
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196
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QGIS Python loop integer with select by expression
I want to use a loop to select values with expression in a layer. The values contain the letters OS and a number (example: "OS1","OS2"). I want to use the loop to increase the ...
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86
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Make a Loop for daily windspeed in Google Earth Engine?
This code give me mask out pixels where in all of wind speeds are below 5, but if I want use this code for many days what should I do? It is hard to write for 30 days. Actually, I want run this code ...
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how write loop for time series in google earth engine
I'm trying to calculate the windspeed from a pixel many times changing the date range from an image collection. I Don't know how write loop for that:
var fc = ee.FeatureCollection('USDOS/LSIB_SIMPLE/...
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2
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150
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Double indexing and looping over raster lists in R
I have a list of 63 rasters. They are the same extent, resolution, projection, etc. Because I extended 62 rasters to the maximum extent of the 63rd, I introduced NA values. However, these are relative ...
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102
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Looping a monthly mean NDVI over a list of years
I need to calculate mean NDVI on a year-parish level in Ecuador. Parishes are the finest level of governmental structure. I have written code (heavily based on this: https://knowyourspace.dk/2020/12/...
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123
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Make a loop to fill null pixels of an image with other images
I am new at Google Earth Engine and I want to fill null pixels of an image collection with pixels of complete images. In my case I want to make that in a loop, in which one the first image of a list ...
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252
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Loop through geodataframe, append 0 values between 2001-2021
I have produced a GeoPandas geodataframe (attached) with rows containing "loss_year" between 2001 and 2021, and some area values (pictured).
I wish to append the omitted years between 2001 -...
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98
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trying to use a loop to buffer around multiple feature classes at once (arcgis using arcpy)
I am using ArcPy to work within a geodatabase in ArcGIS Pro. I need to create a buffer around all the feature classes of a certain type listed in a previous line of code. well_path_list lists all the ...
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105
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Name output feature classes with feature names with ArcPy
I would like to have my output feature classes take on the name of the input features list that I am looping through. Example output FEMA_Clip_09302022
The code below is currently creating output ...
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228
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Loop through headers in CSV file and make shapefiles from each header
I am unable to figure a way out how to create a shapefile after looping through the csv files and matching the headers (dates in format Oct11/2018). Each shapefile should have all the fields with the ...
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87
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Looping coefficient values for raster calculator
I am trying to loop through dbf files to obtain coefficient values using calculate tool and then insert in regression equation using raster calculator to make extrapolated maps. But so far I have ...
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3
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How to subset a raster stack by year with a loop in R?
So I have a folder with loads of .tif files showing NDVI. What I want to do is read them into a rasterStack, then subset that stack by year. I've been able to do this manually, but I'd really like to ...
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Creating custom rectangles for SF features
I am trying to create a custom rectangle for each point in my df. I am using two functions to loop through each feature and write a new polygon output. I would like one SF data frame with each of the ...
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49
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Running multiple models within a Toolbox (.tbx) with 1 python script
I am trying to run over 80 models between 2 toolboxes. I know I can list them out to run them (example #2) but is there a way to iterate/loop through each model and run them one at a time without ...
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3
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403
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Create multiple rasters from single spatialpixeldataframe, by Unique id
I have a SpatialPixelDataFrame (spdf) which contains gridded values (UD) for different Unique id's (n = 21).
I would like to create an individual raster for each Unique_id, with value (UD) as the cell ...
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68
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Using a dynamic formula with parrallel kringing in R
I am trying to achieve parallel Kriging in R on several variables using a loop. Here is a reproducible example using data meuse and a code for parallel kriging that I found here. In the code below, ...
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86
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Looping to do cloud mask for several raster files in R [closed]
I have over 200 land surface temp (LST) rasters and I want to mask each LST raster using the corresponding cloud Mask raster. The working directory has two folders one for LST and one for cloud Mask. ...
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85
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Iterative computation over image collection and multiple indexing in GEE
I am having two image collections, sc, data(Sentinel 1 data).
I need to do an iterative type of computation where I need to use previous output for the next iteration and also multiple images using ...
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195
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Incorrect number of dimensions in creating multiple plots using a for loop with ggplot2
I'm trying to map out all these different "solutions" from the prioritize model using ggplot. (To preface I'm very new to R so perhaps my code/methods are extremely rudimentary and why I'm ...
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223
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Merging rasters from multiple days in loop using ArcPy
I'm using ArcGIS Pro 2.9.3, and I want to use the Mosaic to New Raster tool to merge groups of rasters. I have many days that each have multiple rasters within them. For example, I have
July3a.tif
...
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75
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joinbylocationsummary with loop on the same input layer using PyQGIS
I have adapted a script to use "qgis:joinbylocationsummary" in a loop.
I would like to adapt it so the loop adds all the .shp of the directory 'layers_I_want_to_add' to join their maximum to ...
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1
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60
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Optimal workflow for automating placing points that represent clusters (between QGIS, FME, Python)
Ultimately I would like to automate the process of generating clusters from points (representing buildings and amenities within a neighbourhood), and placing points at street intersections which are ...
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396
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QGIS Python script crash when looping many times (memory problem?)
I'm having trouble with a part of a Python code that does many iterations (about 5000).
The problem found is that the program crashes, it returns an error (sometimes memory error, other times all QGI ...
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202
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Loop chapter with map
I need to create a document to show the interventions done in different neighborhoods, I´d like to do it on a loop as the maps are all the same, except with different shapefiles that are named the ...
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80
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Python script to turn off a checkbox in all layers in ArcGIS Desktop
I need to remove the check for all the layers on a map that has the "UT Simbology" check. I am not really sure If I could use update layer because this is an extension developed by a GIS ...
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49
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PyQGIS actions does not work for second half of the loop
I have a folder with 1600 subfolders. I've developed an script to merge two shapefiles from each subfolder and store the result in the same subfolder. I ran the script and it worked well. However, ...
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561
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ArcPy Spatial Join Loop use the output layer as the target feature
I am trying to generate a script that executes a Spatial Join between specific shapefiles.
However the only values that are added to the result feature are the first and last in the list of shapefiles ...
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95
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Create the loop for multiple raster convert to vector polygon using the arcpy scripting tool
This is my code which works only with the one raster image. But I need to create the tool that converts the multiple raster to vector in loop with arcpy.
import arcpy
from arcpy.sa import *
arcpy.env....
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1
answer
498
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Raster calculation with conditions in R
I have two rasters (A,B) with the same resolution, extent and crs. Now I would like to generate a raster C with the value 1 for each cell that have a value of 30 or higher in A and B. I use a loop, ...
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506
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How to multiply one NetCDF file to multiple NetCDF files
I have one NetCDF file (region.nc) that I want to multiply to multiple NetCDF files such as the one in the picture using -mul from CDO.:
The output should be new NetCDF files resulting from the ...
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