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.

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Is it possible to do parallel processing in GDAL and QGIS?

It seems like processing a large raster dataset in QGIS can cause a crash, for example in QGIS failing to complete clip or intersect and crash dump in qgis. Is it possible to use GDAL parallel ...
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202 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 ...
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345 views

Multiprocessing in python qgis?

When i try to do mutliprocessing in python Qgis it doesn't work from multiprocessing import Process,Lock import multiprocessing def name1(l,i): print i if __name__=='__main__': lock=Lock() ...
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64 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 ...
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68 views

Avoiding edges using GRASS generalization?

I'm trying to process the national wide land cover data into vector polygons. In order to be quick I separate the data into several tiles and process them in parallel. process flow is : 1. v.in.ogr ...
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40 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("","","...
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176 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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231 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 ...
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15 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....
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38 views

Sending commands into FGDB

I have a large .gdb of all blocks in the United States, available from Census. I would like to create a point shape file of all census tract centroids in the US. I have QGIS with FileGDB enabled, as ...
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18 views

ExecuteError when loading rasters using ArcPy Mosaic to Raster tool and Python multiprocessing

I'm attempting to merge thousands of rasters into a smaller more manageable number using the Mosaic to NewRaster_management tool in ArcPy. The code I've written works just fine when I run it the ...
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88 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 ...
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250 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 ...
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167 views

A Distributed Cost-Distance Algorithm

I'm currently trying to implement a distributed cost-distance algorithm, however I can't seem to invent my own and still make it fast. I've been googling around a bit but haven't found anything that ...