Geographic Information Systems

Questions tagged [iteration]

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Repeated execution of some groups of code statements.

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25 views

Iterating over layers to export data as a CSV

I'm trying to export particular columns of data from the attribute table to a CSV, I've added in a functionality to remove the excess commas to make this easier so that I end up with two neat columns ...
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1answer
30 views

Using ArcPy GetCount to return number of records for each table in GDB or MDB

This is sample code from Esri import arcpy arcpy.env.workspace = "C:/data/data.gdb" arcpy.GetCount_management("roads") My understanding is this provides the number of records in ...
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20 views

Iterating over features in Google Earth Engine

I am using the Zonal Time Series plotter from the LandTrendr scripts to plot an NDVI time series for a geometry. I would like to modify the script to be able to loop through objects in a table, ...
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24 views

How to iterate multiple raster dataset to calculate raster in ModelBuilder?

I would like to iterate multiple raster images using ArcGIS ModelBuilder. The Raster Images include Modis13Q1 NDVI and pixel reliability. I want to perform ArcGIS raster calculator to compute the ...
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34 views

Iterate Graphical Model over a set of numbers in a non geometric layer

I have built a Graphical Model which, among other actions, extracts attributes of a vector layer by using the 'Extract by Attribute' algorithm. The extracted features are those whose Time in the Date&...
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1answer
74 views

Iterate a model with Python

I have a model that works well but I can't iterate with a batch process. Therefore, I would like to use a python script to iterate to avoid repetitive tasks. I want iterate my model (that I have ...
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0answers
17 views

Extracting median value of pixels for water areas in each feature in feature collection then exporting to csv using Google Earth Engine

I want to extract out the median value of water pixels from mosaics in the NIR and Red band for three areas in a feature collection, then export it to a csv file with one column being date, the other ...
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22 views

Concatenate from all the elements from a list of lists to have a string [duplicate]

I have data from a JSONs like as below data={'type': 'Feature', 'geometry': {'type': 'LineString', 'coordinates': [[410910.0885459831, 2479395.4132211693, 0.0], [410903.8088855865, 2479401.860380645,...
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1answer
39 views

Using Spatial Join, Dissolve and Aggregate in ArcGIS Pro ModelBuilder

I am creating a workflow using ModelBuilder in ArcGIS Pro 2.5.2 that will take updated parcel polygons and create/update the Zoning_Parcel (parcels symbolized at the parcel level) and Zoning_Districts ...
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17 views

NDVI Time Series over Feature Collection of districts

I am very new to google earth engine and I am having trouble creating a time series of NDVI for a feature collection. I am working with the Landsat 8 NDVI Layer "LANDSAT/LC08/C01/T1_32DAY_NDVI&...
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19 views

Extracting the current feature in QGIS modeler iteration

I have a model that stopped working in the last few versions of QGIS 3.x. It worked fine in the past but now there seems to be an issue with the first step. Basically, the model is supposed to be ...
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1answer
42 views

Iterate through dates and through columns using Model Builder of ArcGIS 10.x

I have a point feature class in a geodatabase (approx 11000 features) with 366 columns. From these, one represents the targeted date and the other 365 represents the temperature of one day of the ...
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0answers
20 views

Google Earth Engine: Collecting Region Samples through image collection and merge them

I am using S1 Imagecollection to start a temporal supervised classification. Firstly, I added polarimetric indexes and other data as bands in each image. Then, I filtered the image collection and got ...
2
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1answer
28 views

ModelBuilder Collect Values output values to a table?

I am working with Build Balanced Zones tool in ArcGIS Pro, which uses a genetic algorithm to find an optimal solution to a spatial problem (such as creating zones with equal population). It uses a ...
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1answer
29 views

Combining layers and changing fieldnames in Arcgis Pro ModelBuilder

I have layers containing polygons. The difference between the layers are the periods of the year about which the layers have information. So layer 1 is called Lawn_p1 and layer 2 is called Lawn_p2 (p ...
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30 views

Processing multiple TIFFs in ModelBuilder of ArcMap gives ERROR 999999

I am trying to process multiple tiff files using ModelBuilder. I am using ArcMap and specifically the Iterate Raster function (see below). Unfortunately, when I run the iteration I get an error ...
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1answer
39 views

Iteration in GEE (List Error)

I am writing a code that calculates the number of burned patches in a study area. The process is based on iterating over a list of numbers. Code: Link var country = ['ZA']; var geometry = ee....
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14 views

Model Builder - Interation adds correct shapefile and adds another shapfile with _1 to name

I have a model I did not make but am trying to fix and I am newbie. The first error I see is the iterator (I assume that is the cause) is creating the shape file needed but then duplicating it with ...
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1answer
24 views

Nesting iterators using ModelBuilder in ArcMap

I need to iterate all files in one folder/geodatabase, and perform those operations for all files in a different folder/geodatabase i.e. a matrix, of all entries in one, to all entries in another. ...
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0answers
47 views

Shortest path (point to point) in iteration

I am using Network Analysis-> Shortest path (point to point) to compute the distance between two points, following a network from OSM. It works like magic for single requests, but I do not seem to be ...
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2answers
59 views

Using iterator on only parts of model in ArcMap ModelBuilder

I have created a model in ModelBuilder using ArcMap 10.7.1 which is using an iterator. Is it possible to exclude parts of my model from being "iterated"?
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39 views

Iterate Closest Facility in Network Analyst

I've built a model in ModelBuilder to solve for closest facility. I have 550,000+ input points for both incidents and facilities (same file). This results in an out of memory error. (I used a smaller ...
4
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1answer
94 views

arcpy.SelectByAttribute 'Parameters are not valid' error

I am trying to run a python script to select 5 random points in an attribute table and to loop through every 100 points to do this. When I run the function SelectRandomByCOunt within a python shell, ...
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3answers
81 views

ArcPy iterative workflow

I may just not know the terminology needed to find the proper google results but I am trying to count the number of feature classes and store that for reference later in the script so that if the ...
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1answer
50 views

Create a function with many parameters and apply it over a list in R

I have a list which includes 2 data.frames and would like to apply some analysis to each data.frame. I performed my analysis to a single data.frame and I want to do the same steps over my list. I am a ...
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2answers
45 views

Iterating GRASS function over list

I want to project the shadows from a DSM raster. Is it possible to iterate the grass function r.sunmask.datetime over a list from a csv file composed with interest dates(month/day) and time (hours ...
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2answers
95 views

Adding feature class name automatically from overlay layer into attribute of clipped layer while iterating clip

I am trying to clip the road layer to district boundary layer in QGIS using clip and enabling 'iterate' option and I get the clipped road layers of individual districts. Later, I need to add the ...
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0answers
94 views

Iterate raster data error 00964

I'm building a model in arcmap 10.7 model builder to determine zonal statistics for multiple raster in a geodatabase. The model works, but only when i run it through model builder. When I try to run ...
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1answer
44 views

Iterate through table to do geometric calculation

I've got two tables: tableA holds the objects with it's geometry tableB holds holds pairs of two objects (ids, each in a separate column) from table1 Now I want to calculate the concaveHull for ...
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0answers
27 views

Iteration between different polygons in one layer

I am trying to create a code that will calculte the mean NDVI value for each polygon,the standard deviation , then std/2 and then will classify the pixels inside each polygon according to the next ...
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0answers
145 views

To Iterate through all layers and all attributes for each layer

I am working in the Python console in QGIS 3.10. I want to iterate through all layers and for each layer iterate through all attributes and set them all to 'Hidden'. I want to do this in ...
2
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0answers
42 views

Model Builder ArcGIS - Export topology errors (Iteration Tool)

I was wondering if there’s any option to iterate export topology errors in ArcGIS model builder. My GDB Topology errors has all topologies within the same Topology dataset but model builder seems not ...
0
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1answer
73 views

Collecting and merging Service Analysis Line features using ArcGIS Pro ModelBuilder

I try to collect and merge Service Analysis Line features after iteration. I name my analysis layers with the iteration values, but it doesn't help. The output feature datasets of the analysis named ...
0
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1answer
69 views

Export dimensions of NetCDF as individual rasters in ArcMap

I have a NetCDF file in ArcMap that I created using the Make NetCDF Raster Layer tool. The band dimension of interest is the variable "time", which has 316 grids. I need each individual grid as its ...
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1answer
27 views

Using submodeld in ArcGIS ModelBuilder

I have three geodatabases (176 files each) with raster data. let's call the first one as G, the second one as D and the third one as S. Now I want to perform a raster calculation so that the G1-D1-S1.....
2
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2answers
83 views

PyQgis difference iteration

I use Qgis. I have two layers that are two circles with the same center. One larger and one smaller. I want to do the difference between the two circles BUT only if they have the same "objectid" (the ...
0
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2answers
53 views

Replacing all <Null> values in the attribute tables of all feature classes in a FGDB with the blank (empty) ones

I need to iterate through a file GDB feature classes to replace values found in all the columns of attribute tables with the blank ones (empty''). Here is my code, that doesn't work. Truth be told I'...
9
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2answers
288 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
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2answers
73 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
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0answers
51 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 ...
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0answers
35 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 "...
2
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1answer
73 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
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1answer
51 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
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1answer
123 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
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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 = ...
2
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1answer
424 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
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1answer
209 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: ...
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1answer
43 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. ...
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1answer
945 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
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1answer
45 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 ...

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