Questions tagged [iteration]
The iteration tag has no usage guidance.
110
questions
6
votes
2answers
180 views
Using RECURSIVE in Virtual Layer
Preface
For a while, I was wondering about applying the looping/iterable
functions in QGIS's Virtual Layer. There were several cases when the
application of a loop would be beneficial and ...
1
vote
2answers
50 views
ArcPy Iterative Select by Location
I have a very large dataset with line features that represent a utility, and lines that come off of those utility lines showing connections to buildings.
(example shown below - utility line in black ...
1
vote
0answers
31 views
Multiplying two iterating rasters in ModelBuilder or Python?
I have several Landsat scenes that I wish to remove clouds from. I can do this by multiplying the Landsat layers by their associated cloud layers in the Raster Calculator. How can I set up iterations ...
1
vote
0answers
24 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 "...
0
votes
0answers
8 views
Multi-Geodatabase Iteration and Kriging
I have a huge number of databases in a single folder that have point data with z-values. I need to go through and pull out the point features from each geodatabase and create DEMs for each. Through ...
2
votes
1answer
50 views
Iterate a clip over multiple feature classes using Model Builder or ArcPy
I have multiple feature classes (buildings, airport, land, roads etc) that I would like to clip using a Local Authority boundary. I am trying to create a process in model builder or Arcpy that will ...
0
votes
1answer
39 views
Using ArcGIS Field Calculator?
I have a large shapefile with 2,5 million points and I would like to create a new field in the attribute table that groups the features into groups of 65000 features.
In other words: Select the first ...
1
vote
1answer
63 views
Google Earth Engine -Iterated image of NDWI
I computed the NDWI of the whole image collection and I expect to output an image that shows water body whenever it has been flooded , even once , throughout the filtered date.
Somehow the output ...
1
vote
1answer
32 views
Iterating through 2 different Geodatabases at same time using ArcPy?
I have 2 gdb's; one that contains a polygon feature class of census blocks(cb), and one that contains centroids that may lie within those census blocks. They are organized by state. Ex: FL_cb = ...
1
vote
0answers
61 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 ...
4
votes
1answer
87 views
Selecting neighbours in an iteration using Select by Location
In the 'Select by location' tool, there is an option for Selected features only. When it's ticked, the resulting code for selecting touching polygons of a selected feature looks something like this:
...
0
votes
1answer
25 views
Iteration of AddJoin to join CSV files and a geodatabase feature class file
I have a geodatabase feature class file and I want to join the feature class file to CSV files respectively.
For example:
Join the geodatabase feature class and CSV 1 => save as CSV 1 in gdb.
...
0
votes
1answer
56 views
Filtering area through defined time period using Google Earth Engine?
I tried the following code in the Google Earth Engine through the various countries which have different dry season. But I cannot understand how to iterate the code. can anyone generate iteration ...
0
votes
1answer
37 views
In ArcGIS 10.6, how do I build a model to intersect iteratively?
This is my first time building a model from scratch, so let me know if I've omitted anything in describing this question.
I have a geodatabase that contains shapefiles (polygons) of watersheds. I ...
6
votes
1answer
496 views
Iterating features and buffering using GeoPandas?
I have a shapefile with many large polygons and would like to process each polygon individually because spatial operations on the entire dataset are too big for memory. For instance, iterate shapefile,...
0
votes
1answer
93 views
Print elevation of different coordinates from .hgt file [closed]
I am trying iterate through the data(elevation) from .hgt file. I have attached the codes which i used to get the elevation from the file.
from gmalthgtparser import HgtParser
hgt_file='N09E076....
1
vote
0answers
18 views
Iteration for “Selection by Location” in ArcGIS modelBuilder
I have a featuredataset of 50 Features which are supposed to have intersection with some lines and their Buffers which are in different feature classes. I have created a separate GDB for the Buffers ...
1
vote
1answer
29 views
Sampling from all the images in a collection and combining them into one FeatureCollection
I'm trying to collect a set of sample points from all the images in a collection. However instead of outputting a Feature Collection that consists of a group of Features with the training data as ...
0
votes
0answers
18 views
Joining xls file with shapefile attribute through ModelBuilder?
I have folder contains xls files and I need to make join for each file with a shapefile attribute using ModelBuilder.
My trial is as follows:
and obtained "Precondition" option only.
How can I ...
0
votes
0answers
28 views
Performing iterative Mosaic in ArcPy?
I'm attempting to complete a batch mosaic operation in ArcMap 10.4.1 Python window. I need to run the Mosaic tool about 80 times for sets of three rasters. Basically I want the second and third raster ...
1
vote
1answer
96 views
Getting for loop which stops after first one to iterate properly?
I originally asked UpdateCursor can't acquire lock, but can acquire lock in TestSchemaLock and got some help about why my code wasn't acquiring a lock.
My new problem is that my code isn't fully ...
0
votes
1answer
83 views
How can I add a featureCollection to another one to export into one sigle .csv file?
Sorry if this is an silly question, as I am starting to work with GEE.
I am iterating (mapping) over a Sentinel-2 image collection, using different coordinates and dates in each step.
My goal is to ...
0
votes
1answer
27 views
Building model to select values at point from folder of several raster layers?
I am using ModelBuilder to interpolate values with inverse distance weighting, iterated through several rows, resulting in many raster datasets - one raster layer per row. I have this and all the ...
2
votes
1answer
208 views
Using Iterate Feature Selection in ModelBuilder causes entire model to iterate?
I'm creating a fishnet on ModelBuilder, the extent of which is based on an Input raster.
The output of "Create Fishnet" is gone through an Intersect tool, and then is fed into an Iterate Feature ...
1
vote
0answers
60 views
Select Feature Based on Iterate Row Value in ModelBuilder
I have a table showing commuting trips from home to work. home_id represents home and work_id represents work. Now I want to step through the trips table using Iterate Row Selection in ModelBuilder, ...
1
vote
0answers
25 views
Extracting field values to Excel by iterating in ArcGIS ModelBuilder?
I have a database with a lot of feature classes containing shapefiles.
What I want to do is to use ModelBuilder in order to iterate through all the feature classes and for each feature class go ...
0
votes
1answer
165 views
Iterating folder of shapefiles using ArcPy and exporting mxd to PDF
I'm new to Python and just created a hard coded script for the process I want, and it works. Right now it calls on the one of three shapefile I have in this map document. I want it to do the same ...
0
votes
1answer
335 views
Using %Name% variable dynamically with selection tool in ArcGIS ModelBuilder?
In ArcGIS ModelBuilder is it possible to use a %Name% field value from iterated features in a query and, if so, what syntax should I use?
1
vote
1answer
155 views
RuntimeError: General function failure when running arcpy.da.SearchCursor
I have a script that was previously working but just started throwing an error out of the blue. Here is the traceback:
Traceback (most recent call last):
File "<ipython-input-68-be384b1c4968>...
3
votes
1answer
177 views
File naming iteration QGIS modeler
I am attempting my first use of the modeler from the Graphical Modeler from the Processing menu in QGIS. I made a simple model for cliping species data by sanctuary.It has two Vector Inputs, uses some ...
0
votes
1answer
102 views
Running iteration at end of another in ModelBuilder?
I would like to run two iterations. One assigning the respective attributes from the polygon file containing the cols and rows. And after that iteration another iteration that selects all of those ...
-1
votes
2answers
89 views
How to iterate through date and time text file, line by line?
I am building a model on ArcGIS and I am now trying to iterate through a text file that contains in each line date and time information.
I tried to do that on Model Builder, only I used the get field ...
1
vote
2answers
122 views
How to extract multiple polygons from a layer that overlap with a point?
I would like to get attributes of polygons that overlap with a point. This is to see on which street the lanterns are located, so if they are on a crossing I want to get both streets.
Right now I can ...
0
votes
0answers
16 views
Intersect five different points of same layer
In ArcGis Desktop I have the following problem: I have a layer of sites, let them be hotels, for instance, and I want to find each place, where there are less than five hotels within a radius of 30 km....
1
vote
1answer
200 views
How to iterate through a list of polygons' centroids in QGIS
I'm the new one.
I try to calculate the azimuth between a row of polygonsheets to print the number of the last and the next sheet inside the sheet in direction of the last and the next sheet. This ...
1
vote
0answers
729 views
Creating FeatureCollection from imported assets in Google Earth Engine? [closed]
I have imported several shapefiles as a Fusion Table in Google EE. My goal is to calculate the amount of forest loss (from Hansen et al) and the MODIS VCF (percentage tree cover) for each shapefile, ...
4
votes
4answers
229 views
Problems with for iteration in arcpy
I want to fill a new field in a shapefile using arcpy. I have differents values so I am using for iterator to run all rows.
But when I run the code all rows are filling with the latest row value.
The ...
0
votes
0answers
165 views
Interpolate Multiple Data With Kriging In ModelBuilder?
I am having problems building a model for running interpolation on multiple data using the Kriging method.
I have followed these steps:
Convert multiple data to geodatabase file
Used iteration on ...
0
votes
0answers
30 views
Adding median values of several rasters (geotiff) to each fishnet polygon (200x200metres fishnet) using ArcGIS ModelBuilder?
I have a 200x200metres fishnet of my study area, with a few attributes in it, like land use, percentage of each landuse class.
Now I need to add the median value of more than 10 rasters to the ...
0
votes
1answer
43 views
Trying to build a model to get all layers(same name, different folders and different geodatabase) into one
I have over 3000 folders, each folders have a geodatabase and each geodatabase consist of a layer name called "lot".
I want to merge the all the "lot" layers into one layer shapefile, my gis ...
0
votes
1answer
35 views
Batching field calculations and feature classes in feature dataset using ArcPy?
I'm working on writing a script that will calculate facility ID's for feature classes in a feature dataset. Is there a way to do this without making feature layers and doing select/field calculate ...
2
votes
0answers
22 views
How to take all active layers as input for an iterative algorithm?
I have a whole list of different layers I want to do a iterative clipping algorithm on. (Batch processing is not an option as the 'iterate' button is gone.)
This is a follow up on my question here.
...
0
votes
0answers
58 views
replaceDataSource issue when iterating through a loop for multiple map documents
Trying to update data sources across multiple map documents. The first iteration works but fails on the second no mater the order.
The input csv is the output from another script that lists unique ...
0
votes
1answer
468 views
Applying batch process with ModelBuilder in ArcMap?
I have done a process in a Model Builder in ArcMap 10.5 version and in order to execute it once over a lot of rasters I have used raster iteration.
It works well, but I cannot specify differents ...
0
votes
1answer
72 views
ogr2ogr apply sqlite dialect to multiple feature classes within a fgdb
I have a quite many feature classes in a filegdb and they all have same data schema (same field names and etc).
I wanted to apply a single sqlite query and I am having hard time to make a loop ...
1
vote
1answer
59 views
Output extend for raster calculator (setnull set)
We are working on a project to find least cost path for marine shipping based on some criteria. In a phase when iterating raster datasets and using raster calculation to use setnull function to ...
1
vote
2answers
245 views
Spatial join iteration in ArcPy?
I'm pretty sure this is simple. I'm used to just doing a few maps at a time, and manually joining them doesn't take too much time. However, I've now managed to get myself into the situation where I ...
6
votes
1answer
2k views
Mosaicking a Image Collection by Date (day) in Google Earth Engine
I have an image collection of Sentinel-1 data over 3 years filtered by a region of interest that spans 3-4 tiles, and want to know the best way to mosaic all the images (tiles) that were taken on the ...
0
votes
0answers
41 views
Using iterator to merge Excel files into Shapefile with ModelBuilder for ArcGIS Desktop?
Using ModelBuilder in ArcGIS 10.2 I want to iterate through a folder containing .xls-files, convert them to tables, and merge them into one Shapefile.
I tried the script Excel To Table, with and ...
2
votes
1answer
90 views
Modelbuilder - iterate consecutive workspaces and select specific rasters from each
This is probably easiest explained with a picture,
I'm trying to iteratively perform a calculation using specific rasters from each two consecutive folders in a folder. For example from above picture,...
