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Questions tagged [parallel]

An R package for Parallel Computation

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Using a dynamic formula with parrallel kringing in R

I am trying to achieve parallel Kriging in R on several variables using a loop. Here is a reproducible example using data meuse and a code for parallel kriging that I found here. In the code below, ...
ePoQ's user avatar
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1 vote
1 answer
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Processing time applying dask_geopandas. Dissolve a polygon layer with parallelization

I'm testing the dask_geopandas library to dissolve a polygon layer. However, at the moment the processing time applying the dissolution without parallelization (df) is lower than applying the supposed ...
José Manuel Izquierdo Segovia's user avatar
2 votes
0 answers
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Boundary Placement in QGIS 3.x

in ArcMap there is a great function for polygon labels - boundary placement. So at the boundary with a new polygon the labels of both polygons are displayed opposite each other. Is it possible to do ...
geoinformstory's user avatar
4 votes
1 answer
1k views

Drawing multiple parallel lines with set distance within polygon using QGIS

I need to draw a series of parallel lines, within a polygon (See example below). Previously I have used MapInfo for this (Easy to draw a grid and delete the horisontal lines), but my workplace is ...
Mads Nygaard's user avatar
3 votes
1 answer
358 views

Generating parallel points along with lines or outline of polygon

In QGIS using the Geometry generator, how can we generate the square points within a polygon (e.g. built-up layer) that parallel with other features (e.g. road layer) like in the map below?
GISarath's user avatar
3 votes
1 answer
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RasterBrick from large rasterStack takes long to process in R

I have a list of 420 rasterLayer .tif files that I need to create a rasterBrick from. I first create a stack: library(raster) rList <- list.files(pattern = ".tif") rasterStack <- stack(...
Joanne Bentley's user avatar
1 vote
0 answers
50 views

QGIS Exporting geometry of repeated labels of line layer?

I would like to export geometry (in any format, preferably as a separate point shape, but will work around if necessary) OF LABELS of a line shape layer, where I use repeated labels ("Parallel&...
Peter's user avatar
  • 143
6 votes
2 answers
623 views

Postgis - Zonal statistics - Parallel computation?

I am looking to speed up a postgis query, regarding zonal statistics. I am using postgis 3.0 with postgreSQL 12 and I was hoping that I could apply the below script to speed up processing using ...
tastatham's user avatar
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1 vote
1 answer
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Clipping multiple rasters by matching polygons from SPDF in R

I have about 50.000 small glacier rasters (rectangular shape) that need to be clipped to the glacier's extent. I have the glacier polygons stored in a large SpatialPolygonsDataFrame. I want to use ...
Florian Mlehliv's user avatar
1 vote
0 answers
161 views

Raster distortion from parallel kriging in R

I am relatively new to parallel computing in R. I am using a high performance cluster to perform kriging for soil data points. I found this previous post which I used as a template: How to achieve ...
dtg37's user avatar
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1 vote
1 answer
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Parallel lines inside of polygon

I have an irregular polygon. I want to make parallel lines with 14 meters of space between the inside of the polygon using QGIS, does not matter the direction, but it is necessary to have the least ...
John stats's user avatar
2 votes
0 answers
595 views

Conditional simulation (with Kriging) in R with parallelization?

I am using gstat package in R to generate sequential gaussian simulations. My pc have 4 cores and I tried to parallelize the krige() function using the parallel package following the script provided ...
maluicr's user avatar
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1 vote
0 answers
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How to visualize values distributed on the line on its parallel (curves problem)

I assign some value for each of points distributed equally on origin line, then I want to move this values to its paralllel line, by splitting those parallel line into equal pieces (which amount will ...
inż. Doman'ski's user avatar
2 votes
0 answers
285 views

create neighborhood list in R with large dataset

I want to create a weight matrix based on distance. My code for the moment looks as follows and functions for a smaller sample of the data. However, with the large dataset (569424 individuals in 24077 ...
Kerstin's user avatar
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9 votes
1 answer
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Gdal won't read geotiff in parallel, but will read it in serial, and will read virtual raster in parallel. Why?

My algorithm takes a global dataset at 30m resolution, breaks it up into pieces, analyzes the pieces somehow, and writes the analyzed piece to disk. As all the pieces are independent, this is ...
Jon's user avatar
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0 votes
1 answer
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Applying SPEI::hargreaves function to time series from each pixel rasterbrick using R?

library(SPEI) library(raster) Basically, given a monthly time series for two variables a and b as follows: a = array(1:(3*4*12*64),c(3,4,12*64)) a = brick(a) dates=seq(as.Date("1950-01-01"), as....
code123's user avatar
  • 345
2 votes
1 answer
515 views

Changing parallel line length to split polygon in QGIS?

I have a polygon which I want to split with a selected line with a parallel line. I have made the parallel line but it's lenght is not enought to split the polygon. It necessary to be parallel with ...
Lassus's user avatar
  • 287
3 votes
1 answer
862 views

Multiple and Sequential Parallel from line

I have a vector line and I want to create multiple sequential parallel lines of this line. How can I do that ? For example, in AutoCAD you can do many offsets by a determined distance, and I want ...
Frederico's user avatar
1 vote
0 answers
143 views

plotKML RasterBrickTimeSeries (timeseries charts) in parallel and regions

I am trying to plot a very large timeseries charts associated with RasterBrickTimeSeries-class in plotKML. The idea is to divide the RasterBrickTimeSeries into regions, and to use snowfall multicore ...
user22364's user avatar
  • 105
1 vote
0 answers
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want to change the line length [closed]

I have a line which is 709 meter long. I need the same line with 750m long. I mean the same line that I need the same direction. Can I solve this with QGIS Desktop 2.16.1?
Lassus's user avatar
  • 287
12 votes
3 answers
7k views

Processing vector to raster faster with R

I am converting vector to raster in R. However the process was too long. Is there possibility to put the script into multithread or GPU processing in order to do it more faster? My script to ...
Diogo Caribé's user avatar
1 vote
1 answer
5k views

Using 'sp' method to subset SpatialPointsDataFrame with SpatialPolygon returns error in parLapply()

I have numerous very large data sets of ship tracking data (Automated Information System; AIS). These are originally in a file geodatabase and can be downloaded here (this is a smaller file for ...
Cotton.Rockwood's user avatar
2 votes
1 answer
394 views

can grass gis module be used in parallel mode

i want to use my customized grass gis(6.4.3) module for separate bands of a sensor in a parallel mode. is it possible? i have created separate location and if one band is executed ,for the second band ...
user28542's user avatar
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