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Questions tagged [loop]

A sequence of instructions that repeats either a specified number of times or until a particular condition is met.

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1answer
16 views

Iterating through geodatabase and assigning field value based on spatial location using ArcPy - Part 2

This currently loops through my dataset and calculates the installation ID field from my dataset with the installation code from my Bragg Area feature that are within the polygon of each row. It works ...
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0answers
18 views

Iterator (Iterate Feature Selection) running loop in undesired path using ArcMap ModelBuilder?

I am building a model using Iterate Feature Selection. I want to run the Iterator -> select by location -> Calculate field, and after finishing this loop (#3 in the image below), I will continue to ...
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1answer
29 views

Loop in ModelBuilder in a specific situation

I would like to make a loop in the next model base on a expression, this expression received a code with consecutive numbers in a reference layer call "sector", to summarize, for each "code" do a "...
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1answer
31 views

Loop through geodatabases and list feature classes [closed]

Trying to find a way to use Python or SQL to loop through geodatabases and print the feature classes. I'm not sure what the difference between while and for loops are; I'm brand new to scripting. A ...
1
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1answer
45 views

Looping through two raster folders to perform raster calculation?

I have two geodatabases with rasters containing information about "treecover" and "loss". The file names are slightly different but can be matched based on the last 8 characters (the coordinates of ...
1
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1answer
49 views

Loop with predict raster function in R [closed]

My data is a dataframe of ALTITUDE in the first column, and monthly temperatures (let's say for a year) in the other columns. I used the following code to create a linear model for each monthly ...
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2answers
39 views

Use ArcPy for finding value throughout all fields and export to new layer

I need to find a way to find a specific value in the attribute table and then export all rows with said value to a new feature class. Below is the code that I have managed to come up with (using ...
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0answers
62 views

Extract time series from ImageCollection for multiple points - Google Earth Engine

I have the Sentinel 2 (COPERNICUS/S2) ImageCollection and a FeatureCollection of points. I want to extract a time series for each of the points from the band information in the ImageCollection. So ...
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1answer
23 views

Write a text file per image with same name in R

In R I would like to create a text file for each picture I have in a folder and with the same name. By example: Picture 1.png - Picture 1.txt Picture 2.png - Picture 2.txt But the text file name I ...
0
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1answer
55 views

Make a loop in Google Earth Engine for reduce NDVI from year a months?

I have this code, it generate N ImageCollection and for each image a chart from NDVI in function a the months This is the place of study: var areaEst = ee.FeatureCollection("users/aleszczuk/...
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1answer
40 views

Didn't show all the column while export the CSV file while using Google Earth Engine

I'm trying to calculate the water areas and the statistics of each band for each water areas to see if there are seasonal changes. The exported .csv file only have the columns ("GNIS_ID","AreaSqKm","...
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0answers
184 views

Data organization in Google Earth Engine image collection?

I defined an image collection contains all landsat SR images(LT5,LE7 and LC8) only including some specific bands each. Finally 685 images in path 120 and row 32, each contains 10 bands were selected. ...
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1answer
49 views

Multiple selections with a python loop

I am very new to Python and have no idea about how to write a python loop to do selections for ArcGIS. I already finished writing selection codes with different conditions. Is there anyone helping me ...
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0answers
32 views

Creating loop in raster algebra which compares each cell to values of other rasters in time series?

I have a list of rasters representing NDVI values (and plan to do similar thing with some other index values as well) and in that raster I also set all values representing clouds to NoData. Now, for ...
2
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1answer
52 views

Nested loop and terrain analysis R

I have a raster stack with 11 layers that I am running through a triply nested lapply(). I expect 44 layers to be returned, but I'm only seeing 4! Reproducible example: # Load packages library(...
2
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1answer
159 views

ReduceRegion Loop GEE [closed]

I'm trying to loop a ReduceRegion function in Google Earth Engine to obtain a month mean NDVI over a polygon. But I've not been successful yet. I did for one month. At the end, I should have a list ...
1
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0answers
33 views

Make a script run indefinitly

I have created a script which reads a JSON file and based on the attributes creates a grid and assigns values to the grid. This JSON file may change. I wanted to create an infinite loop to run the ...
0
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1answer
90 views

How do I implement a JSON file with coordinates into a var with featurecollection? (TURF)

I am trying to use the nearest function in TURF, so what I have is a JSON file with information about parkades: { "type" : "FeatureCollection", "name" : "ubcv_parking_www", "features" : [ { ...
1
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1answer
81 views

Buffer loop with Python QGIS

I want to iterate a buffer from a list of distances I have, but I can´t find the way to do it. I´m a beginner on Python. import processing x=[100, 200, 300, 400, 500] processing.run("native:buffer",\ ...
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2answers
48 views

Loop through a range of rasters and use tool output as input for the next tool run

I'm using the particle track tool and limiting it to a specific trackingtime. For each tool run, I want the rasters input (magnitude and direction) to change to the next rasters in the lists, and the ...
0
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1answer
161 views

Including conditional operation depending on number of images?

I want to do certain operations depending on the number of images in a filtered collection. I am working within a loop, so I need the condition to jump to the next step in the loop given a condition. ...
1
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1answer
363 views

Looping a raster stack with a step, R

I have a large raster stack of about 500 rasterlayers. What I want to do is to extract specific layers and store them in a different strack. The layers for which I am interested in, have a step of 8 ...
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1answer
38 views

Loop through two raster datasets by order and perform a function

I have two raster datasets that I need to loop through by order and select the first raster from the first dataset with the first raster from the second dataset to perform a function. I keep getting ...
0
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1answer
131 views

Export raster over a loop in Google Earth Engine

I would like to export raster in a foreach loop with : var landCover = ee.Image('MODIS/006/MCD12Q1/2016_01_01').select('LC_Prop1'); var countries = ee.FeatureCollection('USDOS/LSIB_SIMPLE/2017'); ...
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0answers
35 views

Extract values from multiple rasters based on lookup of raster file name

I have 11 raster files (waveheightfiles), and need to extract one value from a different set of coordinates (station) for each raster. I have a list of 11 coordinates (df2) and have used part of the ...
1
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1answer
43 views

Looping a function over a sequence of parameters with iterate()

I built a function landcov(area, date) to calculate the share of land types 0 to 3 in year "date" from MODIS12Q1 within the polygons of the "area" parameter. I want to use iterate() in a loop-like ...
1
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1answer
81 views

Looping Eliminate tool in Python?

I am very new at Python,I'm not sure if this is even the appropriate way to do what I want to do, but basically, I'm looking to eliminate all of the small polygons in a feature class that was created ...
1
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2answers
101 views

Looping through a table to allocate kids to nearest school

The general problem is to allocate town's kids to their nearest school and get the distance and the geometry. Tools in use is Postgresql 10.6, PostGIS 2.4.3 and PGRouting 2.5.2 There are three ...
0
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1answer
71 views

Using for loop in least cost path analysis using ArcPy?

I am doing a least cost path analysis. I need to create a for loop that will run 3 times and select the correct weight from each of the two lists (slope and land). Slope = [10, 20, 30] Land = [30, 20,...
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1answer
422 views

turf.js point never found inside or within GeoJSON features loop

I have a GeoJSON http://radikal.com.mx/distrito.json and all I am trying to do is find if a turf point that has a longitude and latitude is inside or within that GeoJSON. No matter what point I use I ...
1
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1answer
320 views

Calculate difference of subsequent images in a collection

how do I call a Specific Image inside a Collection, to loop over it? this is for calculating the difference of images for each set of two subsequent images in a collection dImage= Image(t=i+1)-Image(...
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0answers
15 views

ogr2ogr loop through feature classes in FGDB except one feature class

I have multiple fgdb and I wanted to merge this to one FGDB and this is the command I used so far find . -path "*/*1*/*.gdb" -o -path "*/*2*/*.gdb" -o -path "*/*3*/*.gdb" \ -o -path "*/*4*/*.gdb" -o -...
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2answers
66 views

Arcpy UpdateCursor not Updating, but no Error Reported

Below is the code I'm using in an SDE GDB, on ArcMap 10.4.1: import arcpy # Variables inputAsbuilt = arcpy.GetParameterAsText(0) transmedia = inputAsbuilt + "\\Transmedia" structure = inputAsbuilt + ...
4
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1answer
634 views

Iterate through list of field names and calculate fields with PyQGIS?

I am using QGIS 3.2.1 Bonn 64 bit on Windows 10. I would like to loop through a list of field names and perform calculations on each field. Only the first loop in the iteration performs any ...
1
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1answer
146 views

calculation with raster and numeric values in Loop with R

I want to do some calculations with a list of rasters of lakes. Therefore I wrote a loop, which has so far worked fine when I only used rasters. Now I have calculations with rasters and numeric ...
1
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1answer
175 views

Creating a Loop in R for averaging Raster values to create time series

I have calculated several different indices for lakes stored as GEOTiff. I now want to write a loop with R to average the values for each lake, so only one value is left for each lake. And then create ...
1
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1answer
55 views

Reducing monthly averaged MODIS data over several ROIs

I want to create monthly averages for the MODIS Land Surface Temperature (LST) product for several ROIs. I am able to create an image collection containing the monthly averaged MODIS data, but I have ...
0
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2answers
140 views

R: Writing individual variables from a RasterStack in loop

I have a RasterStack with 3 layers each one of them containing 19 variables. Using writeRaster I need to save specific variables into my directory while naming the saved files with the actual variable ...
0
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1answer
50 views

gdalwarp for clipping images using multiple polygon in a bash shell for loop

C:\OSGeo4W64\bin\gdalwarp.exe -dstnodata 0 -q -cutline D:\hillsborough_Images_work\split_Polygon\120-140k\Hillborough_FINAL_140000_region_IGD_120570003d29ed0dc.shp -crop_to_cutline -dstalpha -tr 0....
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0answers
99 views

Saving rasters in Arcpy loop

I'm trying to do Map Algebra on a bunch of rasters by iterating through a for loop and saving them in an empty geodatabase. However, they aren't saving properly. Only the last raster is created and it ...
2
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0answers
73 views

Map Algebra loop only creating one raster

I'm trying to transform a bunch of rasters in arcpy according to specific functions to create suitability rasters. This portion of the code is supposed to find all the rasters with interpolated ...
1
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2answers
286 views

Batch Calculating Indices

I have 111 Landsat8 scenes which I want to calculate several indices for. The algebra to calculate them is most of the time Index= (b1-b2)/(b1+b2). I have the single bands (bands 1-11 respectively) ...
3
votes
1answer
147 views

Can't do anything else in QGIS during While-Loop

I've written a Python QGIS plugin that reads data from an AIS receiver via the Serial package. It will be similar in function to the GPS Information panel in that it will show your position on the map ...
0
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1answer
216 views

Running MaxEnt modelling in “dismo” using “loop” and storing the results in seperate objects and folders [closed]

I am doing a MaxEnt modelling using "dismo". I am using a loop to give multiple runs. I wanted to save results from individual runs in separate objects and at the same time the results from individual ...
-1
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1answer
58 views

Writing Nested Loops Using SelectLayerByAttribute_management Iteratively over Multiple Fields?

I need to select all rows matching specific values across 3 columns and then iteratively change one value at a time and continue making selections. The reason is to capture certain summary statistics ...
0
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1answer
320 views

Applying a Loop for my code in R

I am trying to apply a code (in R) for all images that I have in a folder. The code works for 1 image, but when I try to make a loop out of it, it gives me error. library(raster) library(rgdal) ET<...
-1
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2answers
74 views

Script Python on ArcGIS works but do nothing [closed]

I am trying to automate a loop for the Alter Field tool. As the code snippet that comes with the help fits my problem, I used it by changing the workspace path. I also tried passing the path with ...
0
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1answer
89 views

Combining two models, one having an iterator

I have two different ModelBuilder models: Create a new field and split a layer Merge all layers in one folder I want to append both models in one but it does not work. The Model have a loop and I ...
0
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2answers
282 views

how to loop ndvi using R in sentinel-2

I have a two different stacks: one for band 4 (RED) and other with band 8 (NIR). I'm trying to loop the calculation of NDVI in an area of interest using R. Well, this is the loop that I'm trying to ...
0
votes
1answer
46 views

Loop For to export polygons from a Feature Class

I need to export 150 polygons from a feature Class. I have a python snippet code to export the polygons one by one. I think a for loop code can do it fast, but I don't know how to write the code into ...