Questions tagged [parallel]

An R package for Parallel Computation

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votes
1answer
3k 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 ...
7
votes
1answer
712 views

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 ...
3
votes
1answer
714 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 ...
2
votes
1answer
247 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 ...
2
votes
1answer
234 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 ...
2
votes
0answers
103 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 ...
1
vote
1answer
3k 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 ...
1
vote
1answer
119 views

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 ...
1
vote
0answers
279 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 ...
1
vote
0answers
46 views

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 ...
1
vote
0answers
133 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 ...
1
vote
0answers
28 views

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?
0
votes
1answer
428 views

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....