Questions tagged [time-series]
Series of data points indexed in time order.
369
questions
0
votes
0
answers
13
views
Trying to export a time series of EVI values for a large asset in Google Earth Engine
I'm trying to export a time series of EVI data for a large asset containing 40,000 points. I am using the MODIS data. The code that I've written works when I extract data for 5 points, but it's not ...
- 1
0
votes
1
answer
30
views
Splitting and calculating across a large RasterStack using Terra in R
I have a rasterstack, created from an .nc file, named 'dat.stack'
> dat.stack
class : SpatRaster
dimensions : 180, 360, 28896 (nrow, ncol, nlyr)
resolution : 1, 1 (x, y)
extent : -...
- 137
0
votes
1
answer
24
views
LST in GEE: Error generating chart: No features contain non-null values of "system:time_start"
The error:
Error generating chart: No features contain non-null values of "system:time_start"
appears when I try to generate the LST graph in GEE for the selected period. I tried to return ...
- 109
0
votes
1
answer
28
views
Google Earth Engine empty list issue
I am intended to apply moving average function on a list of area values but the code returns empty list? Anyone has any idea?
the code link: https://code.earthengine.google.com/...
0
votes
1
answer
51
views
Error "No features contain non-null values of system:time_start" when charting time series in Google Earth Engine
I want to create a chart showing the yearly average Chlorophyll a over a given time span. However I have been getting the following error when trying to create a time series.
After looking at this ...
- 51
0
votes
0
answers
28
views
How to analyze NDVI time series data
I am analyzing time series data of NDVI within an AOI.
Ultimately, I would like to plot the average monthly data in a box-and-whisker diagram.
Here is the problem.
The number of months with ...
- 23
0
votes
0
answers
10
views
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 ...
- 357
0
votes
0
answers
30
views
Convert irregular time series to regular for running bfast model
I have NDVI rasters extracted from Sentinel-2 with irregular time series over a year and missing data of July. I would like to generate the irregular time series to a monthly regular time series in R ...
- 357
0
votes
1
answer
19
views
Extract, plot and export as a table a vegetation index time series from multipoint feature collection in Earth Engine
Reference is to a tread I posed years ago and was solved Extract pixel values from several bands of an image and export in a single table in Google Earth Engine
The challenge now is to create S2 NDVI ...
- 531
0
votes
0
answers
26
views
Create an array of band names where the pixel value is 1 in Google Earth Engine
I have an image in GEE with 20 bands, each corresponding to one year. Indeed, I have a time series. Each band can have values 1, 0, or -1. Value 1 means a specific event starts, and value -1 means the ...
- 193
0
votes
0
answers
14
views
Adding an extra series to chart Google Earth Engine
I need to perform the same analysis for different geometry points and plot it. Actually I have the plot for each point and when I click on the map creates a chart for the point where I clicked it but ...
0
votes
1
answer
25
views
Analyzing time series data stored in an image collection with GEE [closed]
I have a time series of an index called "slope" from 2002 to 2022 stored in a GEE Image Collection, one image per year.
I am analyzing only the negative values of the index. From that time ...
- 193
0
votes
0
answers
30
views
Smoothed landsat LST time series with lineair regression function
I am trying to get a smoothed result in GEE from my LST time series but I get an error that the memory limit is exceeded.
How can I make my model more effective?
This is my code:
var LLST = require('...
- 1
0
votes
1
answer
293
views
Extract time series subset from NetCDF for many spatial points using R [closed]
I have been following mdsumner's response on Extract time series from .nc files for many locations simultaneously which is a similar question, but am having some trouble. Here is my code:
library(...
- 3
0
votes
1
answer
68
views
Eliminating missing pixels in NDVI time series analysis by temporal gap filling with linear interpolation to get a smooth result
The code is running correctly but it doesn't give me a smoothened result. Anyone who can help me out?
var startDate = '2015-01-01';
var endDate = '2023-12-31';
var images = sentinel.filter(ee.Filter....
- 1