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Questions tagged [bfast]

BFAST is a time-series decomposition algorithm used in remote sensing for change detection. Questions should mention the BFAST version (BFAST, BFAST01, or BFAST Monitor) in the text, and the implementation (R, Python, or GEE) using additional tags.

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Error to generate regular raster stack time series in R using bfastts

I try to convert regular time series raster stack using bfastts function in bfast model in R. When I can generate a time series for 1 pixel (s in the example). However, I cannot generate time series ...
user30985's user avatar
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Using BFAST change detection algorithm for Sentinel -2 images

I am interested in the BFAST change detection algorithm. I saw that this algorithm uses Landsat images. Is it possible to use BFAST algorithm for Sentinel - 2?
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I am using BFAST to do a time series analysis of LST and I am getting NaN errors

This is the blog post I refer to, https://philippgaertner.github.io/2018/04/bfast-preparation/, and the author's code is as follows: # NDVI data data(tura) selected_pixel <- 90 represents a ...
angrybob's user avatar
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1 answer
1k views

How to run BFAST Monitor over a FeatureCollection in GEE

I am working with BFAST Monitor in Google Earth Engine, and I would like to run the algorithm over a FeatureCollection containing individual points of interest. Like this: var norway = ee....
saQuist's user avatar
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1 answer
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Converting raster stack or brick to ts time series object to run in BFAST

# created rasters from .tif file (r1,r2,r3,r4,r5,r6,r7)‎ ‎# created raster stack‎ r_stack <- stack(r1,r2,r3,r4,r5,r6,r7)‎ class : RasterStack ‎ dimensions : 743, 1893, 1406499, 7 (nrow, ncol,...
Hamad Mohamed's user avatar
2 votes
1 answer
1k 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)...
SA Khan's user avatar
  • 197
1 vote
0 answers
2k views

Applying calc() on a rasterstack with certain pixels with all NA values

I have a raststack of 768 NDVI files with 4.1 million pixels each. Now I am performing a pixel based time series method (BFAST) using the following functions: Function to convert daily ts into ...
SA Khan's user avatar
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3 votes
1 answer
1k views

Can BFAST algorithm be applied to to a whole study area/ ROI?

I am working on identification of breakpoints in Landsat based NDVI time series (1990-2018). I am using The Breaks for Additive Seasonal and Trend (BFAST) algorithm which is a pixel based time series ...
SA Khan's user avatar
  • 197
1 vote
1 answer
1k views

Analyze time series NDVI using bfast

I would like to study a trend of NDVI data for a specific time interval using bfast package. For this final aim, I read about the necessity to convert my data frame into a time series object in R. ...
matt85's user avatar
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2 answers
1k views

Extract seasonality and trend values for each time in a MODIS time series

I'm trying to construct a MODIS temporal series as shown in this thread: Harmonic MODIS trend in Google Earth Engine? But I'd like to plot, if possible, the values for trend and seasonality for each ...
Etore Marcari Jr.'s user avatar
1 vote
1 answer
2k views

Converting list of stack images to time series files in R?

I am using bfast package for time series analysis. But it requires the files to be read as time series. How to convert list of stacked images from 2000 to 2013 into a time series and given as input ...
Tharani's user avatar
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3 votes
1 answer
3k views

NDVI time series in R -- how do I create a time series object from a data frame?

I am doing a time series analysis of NDVI using the bfast package in R. Bfast requires a time series (TS) object. I have successfully created a data frame with the NDVI at various point locations ...
James's user avatar
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