Questions tagged [for-loop]
A for-loop statement is a programming loop statement that performs predefined tasks while or until a predetermined condition is met.
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11 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 ...
0
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1answer
31 views
writeOGR error: length(dsn) == 1L is not TRUE
I'm running a for loop R that results in a shapefile being written with each iteration. The for loop runs successfully once, with a shapefile being written out, but then on the second iteration I get ...
1
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1answer
80 views
For loop within for loop with ArcPy cursor?
Below mentioned one is a part of my script.This is working when I assinged numbers for f.(Instead of "f" I have substitute 2.Then it is working).But i want to run this based on the no of rows of the ...
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1answer
23 views
Map.addLayer automation
As in the Hillshade Example, I wanted to automate adding all Layer from one Image for visual inspection.
var band_names =Image.bandNames()
print(ee.String(band_names.get(0)))
for (var i = 0; i < ...
1
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0answers
20 views
Using ModelBuilder to Iterate Row Selection with ArcMap?
I have a model that does a lot of linear calculations, then eventually runs into an ITERATE ROW SELECTION tool. I only want the iterator to cycle through the tools downstream of itself, but instead ...
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0answers
35 views
Focal statistics in vector cell grid in Python
I am attempting to recreate the behaviour of ArcGIS "focal statistics" processing tool in Python 3 (Anaconda distribution). So far I have created a script that seems to work as intended, but because ...
1
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0answers
21 views
Loop over columns of shapefile in modelbuilder
I use a shapefile (rain.shp) with a bunch of columns (rain_1979, rain_1990, rain_1991, ..., rain_2015). I would like to transform every column of the shapefile into a different raster using the ...
1
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1answer
40 views
Making loop over shapefile attribute using ArcPy?
I have a polyline shapefile. The shapefile has a field called "NAME"
I would like to make a loop over each line (A,B,C,D,...).
This is the python code for only first line named "A"
profileLine = ...
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0answers
27 views
Using dictionary key values in for loop for dynamic output variable assignment in Arcpy
I am wondering why I need to include a '/' at the end of my path name when changing my workspace.
I am writing a script where I'm trying to create a geodatabase and then reassign my workspace to it. ...
1
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2answers
532 views
Arrange pair of coordinates in Python lists [closed]
I have these coordinates of a bounding box in this format:
(51.901071, 7.543488, 52.002215, 7.692406) and I want to convert it into a list of coordinates so that I can iterate through the pair. The ...
0
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1answer
75 views
Arcpy iteration in folder for all shp equivalent
I want to write a scrpit that automatize the process of clip and project (in one GCS) to many .shp in folders and subfolders (row downloaded data), with 2 different GCS (CH1903+ or Lambert93).
For ...
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0answers
29 views
arcpy.Delete_management crashing ArcGIS
I'm running a for loop to rescale a bunch of rasters and then save them for use in another function. However, I'm having trouble saving the rasters properly. My current solution is to copy the rasters ...
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1answer
24 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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1answer
127 views
GEE hangs in a for loop using dates
I want to have a loop on a date variable in Google Earth Engine, but it hangs and show me nothing when running just below simple code:
var aDate = ee.Date.fromYMD(2015,12,21);
var bDate = ee.Date....
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1answer
30 views
Raster Properties to TextFile using ArcPy?
I have multiple rasters that I want to get the mean of the all the cells. This is what I have:
env.workspace = r"C:\Users\pyb609\Desktop\Updated
Files\GIS\Dark\Shapefiles\15M"
outfile = open(r"C:\...
3
votes
1answer
96 views
Error in reprojecting raster from WGS 84 to GDA 94
I am trying to reproject multiple .tif files with the following code:
# Import system modules
import arcpy
import os
# Set environment settings
arcpy.env.workspace = r"H:\GIS Project\Bulk Density\In ...
1
vote
1answer
80 views
Creating loop to reproject multiple rasters in ArcPy gives ERROR 999999?
I am trying to batch reproject multiple raster files using arcpy.
Here is the code I have so far:
# Import system modules
import arcpy
import os
# Set environment settings
arcpy.env.workspace = "H:...
0
votes
1answer
110 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 ...
0
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0answers
28 views
Applying Various Symbologies in Loop
The code runs, but the output layers do not display the symbology layer(s).
Any suggestions?
def Copy_Symbology( Symbology_Template , Input_SHP , Output_Layer_Directory ):
baseName = os.path....
0
votes
1answer
93 views
For loop to convert .lyr files to KML files gives ERROR 000814?
I must convert .lyr files to Kml files. After searching, I already tested 3 codes.
Unfortunately, when running the 3 codes Python displays same error:
Runtime error Traceback (most recent call ...
0
votes
1answer
57 views
arcpy for loop to save shapefiles as .layer files
I have 150 shapefiles in folder in "D:\ss3\polygons".
I want to save each polygon as .layer file with the polygon name in "D:\ss3\layers"
However, Python displays: "Parsing error SyntaxError: invalid ...
0
votes
2answers
72 views
Selecting layers of a raster stack using a sliding windows as a step in R in for loop
I would like to create a loop that every time selects the first ten layers of a raster stack, calculates their mean and saves it to a layer of a new raster stack. Also, I would like to have a step ...
2
votes
1answer
233 views
Python loop stops before running all files [closed]
I have a Python loop, the loop has to run commands on 200 plus files. But it randomly stops and does not continue producing the new output files.
here is the code:
from subprocess import Popen, PIPE
...
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votes
1answer
105 views
Extract raster information from a spdf and for different buffer size in a loop
For a project in geoprocessing, I need to extract information from a raster but for different buffer sizes. I have a raster of the population (100 m size pixel) and a SpatialPolygonDataFrame with the ...
6
votes
4answers
730 views
Using LIKE in a For Loop with UpdateCursor
I have a classified raster with a class value that is a very long concatenated string name (Class_Name below). I'm trying to use arcpy to generate integer labels ranging from 1-24 (which are the third ...
1
vote
1answer
45 views
Using a dictionary along with geoprocessing tools?
I am new to python and trying to create a script that will select specific parcels from a large parcel layer. Is it possible to create a dictionary with the names of the parcels as the key and the ...
1
vote
1answer
64 views
Iterator in ModelBuilder does not complete final iteration (last action)?
I am using the ModelBuilder to run an iterative process using the "for" iterator. The entire process is about 7 steps that are iterated several times, depending on the input to the tool (to value, ...
1
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0answers
250 views
Stopping arcpy for loop in cases where outputs match wildcard and get fed back to for loop list
Using a list of the feature classes matching a wildcard, I loop through 12 feature classes with a dataset. For each feature class, I make second list of all unique values within the REGION field, and ...
0
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0answers
195 views
FieldMappings: Error in adding table to field mappings
I got this message when I try to run the code. However, when I put the "addTable(merged_shp)" outside of the for loop, the code works perfectly. I think it might be the directory issue but I couldn't ...
2
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2answers
404 views
How to run for loop with unique values
Instead of two shapefiles that are saved in fcList in this loop I would like to do KernelDensity on the unique values of one shapefile.
Does anyone have an idea how this might work?
import arcpy,os
...
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2answers
101 views
Saving output in ArcPy For-Loop?
How can I save the output of my For loop so that I have a different output name each time?
This is the code I´m using:
import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = r'C:\...
-1
votes
1answer
41 views
Python For Loop is Adding Extra Records to Output
I'm using Python in ArcGIS Pro to run through a couple of point layers to find the Closest Facility between them. I think I'm really close to getting what I want in an output, but I'm getting more ...
2
votes
2answers
267 views
arcpy: For loop to sequence Processing of two items in list using ArcPy?
I have multiple rasters, organized by years. I.e.
raster y1 = from year 1
raster y2 = from year 2, etc...).
All of rasters contain values 0-11, representing forest (0-6) and disturbance (7-11).
I ...
1
vote
1answer
59 views
Looping script with Zonal Statistics
This is my first time using python in ArcGIS. I have a gdb of about 100 feature classes, and need to get Zonal Statistics for each. I'm using a textbook, and got this so far:
import arcpy
from arcpy ...
1
vote
2answers
470 views
Append element to an array in Google Earth Engine
I am trying to write a for loop to append elements dynamically to an array. However, the dimensions of the array change on every loop run, throwing off error.
var arr = 1
for (var i=0;i<4;++i){
...
0
votes
1answer
73 views
For Loop not looping correctly - ArcPy
I have four markets 1000-4000, but I only want to do markets 2000 and 3000. I created a markets list only containing those two markets so that I could use the list in a "for" loop. However, when I try ...
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votes
1answer
61 views
SQL query new feature within definition within loop of cursor
I am using ArcGIS 10.4.1.5686 and running code within ArcMap. I thought that this question is similar to SQL query new feature with loop, or even Using a for loop to execute a query in arcpy, but ...
1
vote
1answer
51 views
Use results of loop for another raster calculation
I've been looking extensively to find a solution for what I think is a very simple exercise.
In general, I would like to know how I can extract a variable from a loop in Python and then use it ...
1
vote
1answer
61 views
Map Automation Script For Looping Help
Working on a Python script that I will run inside of ArcGIS 10.5 that will export PNG maps. Each map will be a different state and for every state there will be 5 different physician specialty types, ...
1
vote
1answer
174 views
For-Looping through Bookmarks in Python Script tool?
I'm using this script tool, in ModelBuilder for ArcGIS Pro, to set up a map layout, reference a bookmark, and export the layout as a PDF. This model iterates through Urgent Care centers and its ...
0
votes
0answers
28 views
cost paths for paired sources and destinations
I wish to calculate least cost distances for pairs of coordinates, each pair is a row in the same dataframe with a common "tag" id field.
I am working on arcmap 10.4.1 for desktop, but am now ...
2
votes
1answer
371 views
How to iterate in a Spatial Polygon Data Frame in R?
I'm trying to iterate in a SpatialPolygonDataFrame that contains 110 features.
I tried to use the following code with no success:
iterate.spdf = function(x){
for(i in 1:nrow(x)){
p = x[i,...
2
votes
0answers
150 views
Creating instances of QGiS in for loop in standalone python script
I have a Python script which processes data with geographic information. At some stage of my script I need to use an instance of QGiS to make some shapefiles and do some intersects and so on. For now, ...
1
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0answers
194 views
Is it possible to list SpatialGridDataFrame files to be used in a loop?
I have a lot (>50) of SpatialGridDataFrame files that I need to turn into raster files, stack with a set of raster files I already have and then extract data from random points from each layer of all ...
1
vote
1answer
481 views
Using Update Cursor in a double for loop in arcpy
I have some problems using a double for loop and getting results written into a geodatabase.
I have got a shapefile with polygons (param_polygone) and I want to add data to it, which is stored in a ...
2
votes
1answer
71 views
Iteration through shapefile rows is taking too long
I'am using a shapefile with leaflet in r, where i am iterating through each row of that shapefile with a for loop and then i run an if statement on each of the rows as it iterates through the ...
2
votes
1answer
88 views
Replacing NULL values, loop skips records using Python, OGR, Rtree?
I have a point layer with several NULL values and based on a near analysis with another layer, I would like to replace those NULLs. However, with the code I use it only does a couple and then stops. ...
3
votes
3answers
485 views
Using IF statement in FOR loop? [closed]
I'm trying to use a for loop in a list to assign different buffer widths to the list depending on the length of the line being buffered. I have my list of lengths, and tried to use a for loop to ...
1
vote
1answer
110 views
Loop using Reclassify function: string 'RemapRange' object is not callable
I am a newbie of python teaching myself using the arcpymanual.
I am running a Reclassify script on slope grids. It works fine for the first loop then I get an error message for the remap line. I ...
1
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1answer
44 views
Continuously changing values in the same band of a multiband raster
I am having issues with continuously changing the values of pixels within a single band of a multiband raster using python 2.7. Essentially, what I am trying to do is continuously change (increment) ...
