Questions tagged [iteration]
Repeated execution of some groups of code statements.
187
questions
3
votes
1answer
32 views
number the soil_unit_code in a soil_id column
I believe its pretty easy to be done, but I just don't seem to see the solution in Qgis. Is it possible in the field calculator?
I've an attributetable with 200 features with like 20 different ...
0
votes
1answer
37 views
Finding if point is in polygon then taking attribute from polygon dataframe and inserting it as a column in the point dataframe
I'm doing some GIS analysis in Python for COVID work. I've geocoded our entire membership (gdf_schoolAgedChildren) base and captured their locations in a shapely point data type (for each member). I'...
4
votes
1answer
62 views
Iterate over features in a model
In QGIS Modeler I want to iterate over vector feature in two layers so that each iteration the inputs are:
Layer 1 feature 1 - Layer 2 feature 1
Layer 1 feature 2 - Layer 2 feature 2
Layer 1 ...
3
votes
1answer
75 views
QGIS iterative rasterize naming
I am working on a PyQGIS script that gives similar behaviour to the GeoCube package. Specifically, I want to create a bunch of rasters from vector data for a selection of fields.
For example, if I ...
1
vote
1answer
29 views
Raster Calculation through two iterative loops in R
Here is a list of files I would like to create a loop with for a raster calculation
"J:\NAIP\temp5\m_4208902_nw_16_1m3m_sd.tif"
"J:\NAIP\temp5\m_4208902_nw_16_3m_sd.tif"
"J:\...
0
votes
2answers
38 views
Running same action multiple times in ModelBuilder model with increasing expression value
I have created this ModelBuilder model
in above expression value is 1 by default but I want to run expression value 2,3,4,5 and up to 50 (it may vary based my dataset).
I tried for while iteration ...
2
votes
1answer
40 views
Shortest path (point to point) in iteration, safe for the case there is no route
I am using Network Analysis > Shortest path (point to point) to compute the distance between two points, following a street network.
Here is the code:
n=0
for f1 in layer1:
#Coordinates from ...
1
vote
1answer
24 views
Seeking ArcGIS Pro equivalent to Model Iteration Properties
I am trying to make the transfer from ArcMap to ArcGIS Pro. ArcMap ModelBuilder properties had an Interation tab that would allow you to run the model multiple times with different stopping criteria. ...
7
votes
2answers
178 views
Iterating through fields and generating formatted string output
I want to iterate through all integer type fields in a layer and generate new "display" fields marked with a 'd' at the end of the name using the appropriate field calculator expression.
The ...
0
votes
1answer
57 views
Select by location (add to selection) is removing previous selection using ArcPy with ArcGIS Pro [closed]
I am trying to select multiple times from the same layer with different overlapping layers by location using the 'Add to selection' method. However only the last selection on that layer is kept after ...
1
vote
1answer
31 views
Iterating and updating through feature class fields based on DataFrame using ArcPy
I am updating mismatched data across two systems and have an Excel sheet that combines a consolidated data set. Unfortunately I do not have a reliable join field to relate this back to my GIS data.
I ...
0
votes
0answers
14 views
Iterate buffering a folder of shapefiles
I'm trying to buffer all the shapefiles in a folder by the same amount. Instead of doing each one individually, I wanted to iterate through them. However, none of the iterate options seem to work for ...
2
votes
1answer
41 views
Iterating through attribute in layer to create new layers
I am working on the school project in QGIS, in which I have Price map of the buildings in a vector layer. Each polygon has its price attribute. The maximal value of price is 20 000.
I would like to ...
1
vote
1answer
47 views
Model Builder: How to iterate rasters into raster calculator
Above you can see I have a simple model in ArcGIS, when I run it, I change the ".tif" name in both sections of the calculation. I then hit OK, and it puts the new raster where it should be ...
0
votes
0answers
25 views
Iterate a feature by expression with unique values in PyQGIS [duplicate]
Im trying to automate the process of select by expression and afterwards export it to a new layer in Qgis using Python. The Layer I'm using is called "Brutvoegel" and my goal is to get all ...
1
vote
0answers
38 views
Iterate multiple tables for input into "Tables to Domain" tool in ArcGIS Pro ModelBuilder
I would like to iterate over multiple tables in a geodatabase then feed the tables into the "Table to Domain" tool in ArcGIS ModelBuilder.
Currently it only seems to iterate over 1 table.
I ...
4
votes
2answers
60 views
Iterate multiple soil fields through Calculate Field
I understand this can easily be done manually using Calculate Field, however I'm looking to automate this process using ModelBuilder as it is a requirement of the current module.
I have 7 Weather ...
0
votes
0answers
18 views
Iterating the raster calculator expression for multiple rasters (point rasters and Line rasters)
I have created a raster calculator tool which identify 5m height (elevation) either side of middle point (point is converted into raster and contain elevation value) of cross section (line is ...
2
votes
0answers
43 views
Iterate through list with numbers (as text)
I want to iterate through a list of coordinates and see it the last coordinate matches the first coordinate. The coordinates are stored in have a GeoJSON string:
'''{"type":"...
1
vote
0answers
38 views
PyQGIS line_locate_point
Using the field calculator I'm able to get this working fine:
line_locate_point( geometry:=geometry(get_feature('trail', 'fid', '206')), point:=$geometry)
But what I would like to do is using Python ...
1
vote
0answers
32 views
Program works in next 30 years with QGIS over multiple layers
For an asset management plan, I want to create a table that programs work for the next 30years. For a given layer, I want to use the start date and the project into future either replacements or ...
0
votes
1answer
33 views
Google Earth Engine: Sampling through image collection [closed]
I am trying to get samples from each image in an image collection and merge them into a single feature collection. So, I wrote the following code (https://code.earthengine.google.com/...
3
votes
1answer
75 views
Iterating and calculating with fields using PyQGIS
Inside my layer there are fields like this:
name | data | length
name_a | field_a_x | ...
name_b | field_b_x | ...
name_c | field_c_x | ...
name_d | ...
4
votes
1answer
60 views
Defining coordinate system for every GeoDataFrame (shapefile) in list
I am looking to set a coordinate system for every GeoDataFrame in a list of them. So I need this:
gdfs[0].crs = "EPSG:6668"
gdfs[1].crs = "EPSG:6668"
And so on but iteratively. I ...
2
votes
1answer
92 views
Iteration over features in PyQGIS processing modules
I have an issue with processing.run commands where I would like to do an iteration over features in a layer with polygons.
zsj = QgsVectorLayer("/data/grassmaster/testVlado/zsj_ba_test.gpkg",...
0
votes
1answer
35 views
Batch clipping all files in folder and then save using ArcPy
I'm trying to use a script to batch clip all files in a folder, then saved with a _clipped.shp at the end of the original, I need a script that is something like this:
arcpy.env.workspace = "E:\\...
2
votes
2answers
145 views
Iterating clipping process through list of geodataframes
I have a folder full of shapefiles, I would like to read them into geopandas and then clip them all to one boundary iteratively. I have loaded all of the shapefiles into a list with this correctly ...
6
votes
1answer
197 views
Collect results of iterative processes in QGIS graphical modeler
I'm using QGIS graphical modeler to build an iterative process that is supposed to:
extract features from vector layer 1 (VL1) overlapping with features from vector layer 2 (VL2) (iterative per ...
2
votes
1answer
43 views
ModelBuilder not passing information through Iterate Feature Classes using ArcGIS Pro
I am using ArcGIS Pro.
I am trying to create a model to iterate through three feature classes in a file geodatabase, all with the same schema. The model performs several joins and field calculations ...
0
votes
1answer
26 views
Using multi iterate of ArcMap ModelBuilder
I want to use more than 2 iterates.
The data I have is point.gdb, polygon data.
There are about 2000 point.gdb.
There are about 1000 polygon data.
I want to save the points that exist in the polygon ...
0
votes
0answers
31 views
Looping using Iterate Features in ModelBuilder of ArcGIS Pro
I have a model that iterates through a dataset (iterate features), each feature has a defined set of steps that gets processed against another features.
ie - take each feature from the dataset, run a ...
0
votes
2answers
91 views
Creating Raster to Point data using ArcMap ModelBuilder Iterate raster tool
Creating Raster to Point data using ArcGIS ModelBuilder Iterate raster
Raster material is in folder (ffaa)
Using Iterate rasters in model builder
Select folder 1 (ffaa) in step 2
Raster to point ...
0
votes
1answer
129 views
Iterating fields using ModelBuilder in ArcGIS Pro
I am trying to combine multiple fields using the iterate fields in ArcGIS Pro ModelBuilder. I can iterate through and get the combined values but it only gives me the combination of one row, therefore ...
2
votes
1answer
273 views
How to Iterate through files in a folder QGIS, using python
I am using QGIS 3.16, and I am trying to run the “service area from layer” function on approximately 400 layers (200,000 starting points in total), I am also due to be repeating this at a range of ...
2
votes
2answers
415 views
Iterating over dates to extract precipitation in Google Earth Engine
I'm looking to sum precipitation for a period of 10-days prior to a specified date. This is just an example - in fact, I have around 60 different dates and I don't want to select each the date ...
2
votes
1answer
58 views
How to solve error: 'user-defined methods must return a value' in GEE?
I would like to iterate a map function over several list-of-lists.
Here is the code I run:
var feature1 = function(h) {
var FCol= ee.FeatureCollection(ee.List(losslist.get(h)).map(function(element)...
1
vote
1answer
33 views
Clipping one shapefile file with 100 different shapefiles (Arcmap 10.1) and retrive 100 diferent outputs using ModelBuilder
I have tried without success to perform this task with ArcMap 10.1. I´m struggling with ModelBuilder.
I have one shapefile (mean precipitation in one country) and I need to clip this shapefile with ...
1
vote
0answers
53 views
Failure to pick up attributes following use of ArcGIS Pro ModelBuilder: Iterate Feature Classes
I have a folder containing numerous point shapefiles
(Species occurrence records) and (in a separate folder) a multipolygon
shapefile of small parcels of land. For each species, I need to
extract all ...
3
votes
1answer
122 views
Calculating final polygon after subtracting all intersecting polygons using shapely [closed]
I have a list of centroids that I buffer to 5000 meters radius. I need to take each resulting circle and run it against the remaining centroids(also buffered to 5000 m) and find the final shape after ...
0
votes
0answers
23 views
ArcMap ModelBuilder iterate Raster and field value of Feature Class with Raster Calculator
We have a geodatabase with rasters and one Feature Class with a field "Radfahrer" (Long Integer datatype).
We try to multiply the rasters with the values of the fields with iteration: ...
2
votes
0answers
51 views
ArcMap ModelBuilder iterate Raster and Feature Class with Raster Calculator
In our model we calculate raster datasets with the cost distance and the raster calculator. We want to multiply these with a field value from the table testbezirk. We have already tried a few things, ...
3
votes
0answers
34 views
Calculating population within a circle excluding intersects with shapely
I have a data of a centroid and a count:
centroid population id
0 POINT(38.9081 77.0349) 9004.0 0
1 POINT(38.8521,77.0377) 517.0 1
2 POINT(38.9081 77.0377) 10369.0 ...
1
vote
0answers
83 views
Iterating through layer using ArcPy
I'm a beginner in ArcPy and I want to perform some tasks using ArcPy but I am not getting results.
I have two layers named survey and survey selection in my current MXD. I want to create map document ...
0
votes
0answers
18 views
Input feature mask name with variable - error 865
I have 73 raster files, with 73 corresponding shapefiles. I have to extract each of these raster by their corresponding shapefiles. I tried to call the shapefile using %Name%, since it has the same ...
2
votes
1answer
99 views
Running processing workflow in PyQGIS for every selected polygon separately in for loop
I would like to run the processing chain written in PyQGIS (as stated below) for every polygon that is extracted by the extractbyexpression separately. But, the code below does not do this for every ...
1
vote
1answer
84 views
Using ModelBuilder to Iterate through rasters and reclassify them
I'm trying to iterate through a folder which contains many Lidar-Intensity Images as .jpg files.
I want to reclassify them all with the same thresholds (3 classes). I used the "Iterate Raster&...
4
votes
1answer
114 views
Iterative merging of .shp per folder through multiple folders using ArcGIS Pro ModelBuilder
In ModelBuilder for ArcGIS Pro, I'm trying to create an iterative model for merging pointfiles according to their names. This is a pre-processing step to handle echo-soundings, spread over one or ...
0
votes
1answer
374 views
Operating with Image collections (Band math operations)
I'm trying to obtain the NDSI index operating with a collection in GEE but always displays a error saying teres is a missing argument in a function and I cannot see the mistake as I followed the ...
0
votes
1answer
163 views
Compute NDVI over each image in an image collection and export NDVI thresholded images
I want to compute NDVI for all images in Sentinel2 (less than 20% cloud cover) in an image collection comprising 5 years. Thereafter, I want to batch export the output as a binary TIF file where NDVI &...
2
votes
0answers
35 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 ...