Questions tagged [parallel-processing]
Use this tag when asking questions about multi or parallel processing - a programming paradigm used to speed up computationally intensive geoprocessing tasks by executing them over multiple CPU cores or threads.
102
questions
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10 views
Dask Geopandas map_partitions only applies to first partition
I'm trying to run a function that takes a Geodataframe as an argument and returns a Geodataframe which has a new column "sum" populated with values. The function works fine when ordinarily ...
1
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1answer
39 views
Multi-processing with network database and ArcMap
I am trying to take advantage of multiprocessing for what would otherwise be a very long run time for a loop execution.
The basic idea is to solve for the optimal route between a given Origin and ...
1
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0answers
20 views
How to do non-blocking OWS requests in Python?
Is it possible to use OWSLib with aiohttp?
Is there a Python library for formatting/parsing WPS (and other OGC web services, such as WMS - web map service) requests, that also supports IO coroutines (...
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0answers
18 views
Set a workspace inside a multiprocessing function inside a toolbox in ArcGIS Pro
I am trying to set a workspace inside a multiprocessing function of an ArcGIS Pro toolbox.
It works perfectly in standalone script, but when I use it in a toolbox I get this error message:
...
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0answers
24 views
parallel changin region - WIND_OVERRIDE
INTRODUCTION: I have 5000 mammal species and I'm studying Extreme Climate Event impacts on them. I'm now analysing warm spell duration index (WSDI) which is defined as number of days in a year where ...
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81 views
Creating indexes with PostGIS using all CPU cores
I have to run a whole bunch of GIST index creation, on some tables containing lots of records (scale of many countries, OSM data):
CREATE INDEX CONCURRENTLY IF NOT EXISTS osm_footways_gist ON ...
1
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2answers
277 views
Fastest way to perform focal operations using R
I know there are already some questions out there discussing this issue, for example:
How parallelize the extract function for raster files in R?
Increasing speed of crop, mask, & extract raster ...
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0answers
43 views
Big data and spatial regression: how to make spml more efficient in R?
I am running a spatial panel regression in R using spml from package splm. When I conduct this on about 1/200th of my data, the program executes. But when I try to do so on a third of my data, R uses ...
2
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1answer
38 views
Parallel process for spatial weights matrix production in R
I have an sf object pData that is rather large (300,000 polygons) and I am trying to produce spatial weights for each polygon:
tilesNb=knn2nb(knearneigh(st_centroid(pData), k = 2))
tilesWeights=...
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0answers
40 views
Speed up zonal statistics with additional calculation
I have two rasters, one is a classified image and the other the corresponding probabilities for a correct classification. Now I need to calculate zonal statistics for polygon segments in the following ...
3
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1answer
44 views
Use multiprocessing to speed up rebuild index in ArcPy
We are in ArcGIS 10.6.1 (on Windows Server 2012) and Enterprise GeoDatabase Oracle 19c (on Linux).
I was wondering if it is feasible to use the Python's ProcessPoolExecutor to open two separate Oracle ...
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0answers
36 views
Error Scipy in QGIS SCP plugin
After clipping I am receiving these errors. I was clipping some satellite images from Sentinel 2 via SCP plugin but QGIS is not processing it. I already posted my problem with Scipy where in QGIS 3.8 ...
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2answers
68 views
Running parallel r.mapcalc in GRASS
I have thousands raster maps (3652, named raster_name.1, raster_name.2,... raster_name.x,... raster_name.3652) and for each map I want to do the r.mapcalc-threshold operation below here:
...
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0answers
39 views
Can I make QGIS export one thing at the time?
While I am exporting a large amounts of TIFF files for my work, I am having a small bottleneck in my workflow. Up until now I have devided the TIFF images in smaller pieces so that my computer can ...
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0answers
123 views
QGIS: How to speed up raster processing?
Is there any way to speed up raster processing in QGIS? I have seen discussion about speeding up rendering and querying, but not processing.
I am using SAGA tools to calculate morphometrics and the ...
1
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1answer
63 views
Multiprocessing ERROR 000210 Cannot create output 'name' Failed to execute Intersect
I am trying to use multiprocessing to process intersects between polygons and points for a list of states and territories (the data sets for the points are large, so my hope was that the ...
3
votes
1answer
271 views
How can I optimize the processing time of the zonal_stats module using multiprocessing in Python?
I am carrying out a spectral feature extraction in Python 3 starting from an 8-band image and a shapefile (consisting of about a million polygons) superimposed on it. I calculate the mean and standard ...
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0answers
57 views
Two tasks at same time in QGIS Modeler
I am new to using the graphic modeler and I do not know how to do certain actions.
I have several treatments to perform on the basis of a buffer zone. Indeed, I have to polygonize 2 raster (which we ...
2
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0answers
97 views
Optimising use of st_within for parallelisation
I'm trying to use st_within() to calculate points within polygons on a fairly complex shapefile. This operation tends to take 4-5 hours which is a bummer for debugging the code. I have access to a ...
6
votes
1answer
603 views
Multi-threaded compression in rasterio?
For writing large raster files (e.g. satellite image GeoTIFFs) to disk, the throughput rate tends to be limited by the compression algorithm rather than by the raw disk IO. (Benchmarks: 1, 2.) This is ...
1
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0answers
250 views
QGIS parallel processes
I am processing a bunch of GPS data using a Qgis python script. The processing takes a LONG time to execute and when it is executing I notice that only a single CPU is pinned at 100%, the remaining ...
5
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2answers
619 views
Definitive list of QGIS multiprocessing tools?
This question is not as straightforward as it seems, but can be summed up with the following:
Is there a definitive list of geoprocessing tools for QGIS that currently support multithreaded ...
2
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1answer
294 views
Parallel processing on rasterstack using Raster and Parallel Packages
I want to run BFAST on a raster stack (768 Landsat NDVI) in parallel processing. In order to illustrate the problem, I used the following reproducible code:
Load necessary packages;
library(raster)...
1
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1answer
1k views
Parallel processing in Pandas
Using this implementation of parallelization raises an ImportError: cannot import name 'Parallel' from 'multiprocessing' The following code tries parallelization with the "denominator" function and ...
5
votes
1answer
223 views
Parallel processing in QGIS3 on Windows system
I am working on a big vector data set with more than 2.4 million features containing 10x10m squares. I wrote a small script in Python to delete uninteresting fields and perform calculations on the ...
3
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0answers
230 views
Running Standalone PyQGIS Script with Multiprocessing?
Is it possible to run a standalone PyQGIS script using multiprocessing for better performance?
I'm creating 1,800 rendered map images and would like to run it across 4 processes to speed it up.
If I ...
1
vote
1answer
231 views
Multiprocess Spatial Join with Spatial Index
I'm a newbie in implementing GIS on Python, but the lack of any GIS software at the office has forced me to learn about it.
I have a huge grid (a multipolygon) that I'm currently filling out with ...
0
votes
1answer
90 views
Using all processor cores when exporting map to TIFF using ArcGIS Desktop?
By default, ArcGIS Desktop uses only one processor core when you export a map. Esri help talks about the possibility of setting environment parameters for geoprocessing tools, but found nothing about ...
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0answers
117 views
Arcpy multiprocessing arcpy.Select_analysis
I have the following script:
import arcpy
from arcpy import env
import datetime
import os
env.workspace = r"Q:\\SDE\Direct Connection to Contours.sde"
dataFC = arcpy.ListFeatureClasses("","","...
0
votes
1answer
108 views
Clipping Raster Mosiac Simultaneously Within Separate ArcPy Scripts?
I have a large raster mosaic dataset that I would like to clip within several scripts simultaneously, but whenever I run two instances of a script simultaneously one always fails with the error:
...
5
votes
1answer
500 views
Parallelize Extracting Large Raster Values (one band) to Points
I have sf data with single point geometries (points) and a 23,000 x 18,000 elevation RasterLayer with a single band, loaded from a geotiff (elev). They have the same CRS. I want to extract the ...
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0answers
568 views
asyncio with multiprocessing
I am trying to run a multiprocessing on a zonal statistic in pure Python. I am new on it. I have to apply a zonal statistic with a shapefile with more than 6 million features on a taster of 6 GBs (...
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1answer
212 views
Enable “Render layers in parallel using many CPU cores” from python console QGIS [closed]
How can I enable "Render layers in parallel using many CPU cores" option from QGIS python console?
4
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0answers
1k views
Multiprocessing with geopandas
I am learning how to implement the multiprocessing with spatial data using the module multiprocessing.
I am trying to implement a spatial intersection between a polygon file and a grid file.
I am ...
2
votes
1answer
243 views
How to use multiprocessing with Make Route Analysis Layer tool
I am using ArcGIS 10.4.1 and Network Analyst extension. As an IDE i use Spyder and Python version 2.7. I created a script where there is a method with the following arguments.
def ra(EndPoint, ...
2
votes
1answer
618 views
Dividing a large raster into blocks for iteration in R
I have very big rasters for processing (#pixels >1,5*10^10) for this project I am working on. Simple functions such as finding the area of a pixels with a particular value, across the entire raster 1) ...
5
votes
1answer
739 views
Python rtree and parallelized code
I'm trying to parallelize with multiprocessing.Pool() some processes that involve queries of R-trees. In the non-parallel procedure, it works as expected.
But when I try to do it in parallel (even ...
2
votes
0answers
124 views
Parallel optimization for query over LiDAR dataset
I'm using PostGIS + pointcloud to store a huge dataset of LiDAR point (2M patches of 600points)
I query this database to obtain the altimetic profile between two points.
At the moment I have a huge ...
2
votes
0answers
824 views
Spatial analysis and parallel processing in R
I am trying to do a point-in-poly analysis using R. I have 4.5 million points and 5k polygons. This is computationally intensive. I was pointed to parallel processing through another post and tried to ...
2
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0answers
33 views
Multiprocessing GALayerToRasters
I'm new to ArcPy and am creating a script to automate some interpolation work.
I have multiple GA Layers outputted by an Empirical Bayesian Kriging interpolation (using arcpy....
1
vote
1answer
78 views
Converting polylines to polygons in ArcGIS using multiprocessing
I am attempting to convert 15 feature classes containing roughly 70,000 contours each into polygons record by record. Using my current code, each feature class takes roughly 16 hours on my current ...
0
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0answers
107 views
arcpy and multiprocessing: switch workflow to shapefiles to avoid schemalocks
I need to processe a large dataset through a bunch of interwoven scripts using arcpy. On a small test dataset my workflow functions fine so far but when it comes to the large dataset i see no other ...
1
vote
2answers
394 views
Using MultiProcessing With Update Cursor?
I am trying to use multiprocessing to help me run a tool that will clip a feature and sum an attribute in it. The tool needs to iterate through about 24,000 rows of a featureclass while doing this. ...
5
votes
1answer
2k views
R - multicore approach to extract raster values using spatial points
It might look like this question is duplicated, but I'm asking about data extraction by points, rather than by polygons, and I couldn't find hints about point extraction. Therefore, please bare with ...
2
votes
1answer
611 views
Does anyone already parallelized mosaic function for rasters in R?
Does anyone already paralleled mosaic function for rasters in R?
It seems that snow still doesn´t deal with this on an automatic way.
The idea is something like this:
r1<-stack("fit__test23KLR....
0
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0answers
341 views
Multiprocessing Script Tool doesn't crash but will not function
I've made created a script that uses multiprocessing to break up a very large point dataset into pieces and extract values from 2 different rasters to them. When I tested it using the command line ...
8
votes
3answers
4k views
How parallelize the extract function for raster files in R?
I´m trying to parallelize a simple "extract" operation like this:
UseCores<-detectCores() -1
cl<- makeCluster(UseCores)
registerDoParallel(cl)
all.test.poly_period.test<-extract(stack.ts, ...
2
votes
1answer
242 views
PyWPS with python multiprocessing
I have a python script that runs a set of queries in parallel using multiprocessing.pool and map_async.
The script from @Aaron works perfectly.
Now I want to integrate the same functions into a ...
4
votes
2answers
4k views
Processing multiple files simultanously using python
I have 11000 point shapefiles to run Near tool on against another point shapefile.
I am looking for a way to process 10 files at the same time.
Is there a way to process so many files using Python ...
14
votes
1answer
5k views
Does GDAL support parallel processing?
I would like to speed up the process corresponding to this command:
gdalwarp -t_srs EPSG:4326 -overwrite input.ntf output.tif
Is there a way to use parallel processing in GDAL?
Semi-offtopic: If not,...
