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Questions tagged [time-series]

Series of data points indexed in time order.

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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 ...
Lauren's user avatar
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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 : -...
Beardedant's user avatar
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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 ...
Kauan Kubaski's user avatar
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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/...
AmirHossein Ahrari's user avatar
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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 ...
Ben Watson's user avatar
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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 ...
aogorou's user avatar
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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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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 ...
user30985's user avatar
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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 ...
Lollo's user avatar
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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 ...
Isa's user avatar
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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 ...
Paula Torres's user avatar
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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 ...
Isa's user avatar
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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('...
Eppez's user avatar
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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(...
Hailey's user avatar
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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....
Eppez's user avatar
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Trying to create mask to eliminate false NDVI numbers in GEE time series analysis using Sentinel data

It keeps given me the error that ndvi.gte is not a function, I shared my code below: var images = sentinel.filter(ee.Filter.date(startDate,endDate)).filterBounds(geometry) print(images); var ndvi = ...
Eppez's user avatar
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Unable to compute graph in Google Earth Engine when trying to compute mODIS NDVI Time series analysis of a small region in Crete, Greece

I want to make a simple time series analysis of the past 8 years using MODIS data but I'm unable to compute the graph as I get the following message: Error generating chart: Collection.first: ...
Eppez's user avatar
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20 views

Why the value of MCD15A3H LAI is relatively low compared to the actual value?

I want to obtain the MCD15A3H LAI long time series of winter wheat samples and apply Savitzky Golay smoothing filtering to them. However, during the rising period of winter wheat, the value of LAI is ...
Lix's user avatar
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2 votes
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88 views

Troubleshooting GeoServer Vector Tile TIME VIEWPARAMS Misinterpretation in Mapbox GL JS Integration

I am trying to deploy a spatial layer with data in PostgreSQL/PostGIS. The data has a temporal dimension and is configured as such in GeoServer. The goal is to use the layer through Mapbox GL JS and ...
Jean-François Legendre's user avatar
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Applying a Savitzky-Golay filter using OEEL with Google API

I've been writing a code based on instructions from Geo for Good 2022: Time Series Processing Using Google Earth Engine- https://www.youtube.com/watch?v=ncb5_zbvnaU. Specifically, after creating a ...
Mike Baars's user avatar
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1 answer
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Trouble Extracting Fitted Values with Year Information in Landtrendr using Javascript - 'index.toUpperCase' Error

I'm back working with Landtrendr in Javascript and have had some problems. I'm trying to separate the fitted row from the Landtrendr band and export it to an image, so I have year bands of fitted ...
AnHD's user avatar
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60 views

Accessing single point data from time-series raster

I am creating a python dash app that needs to extract a single lat-long point of data from a each raster in a time series set of about 80000 bands, each covering the world. The raster data is stored ...
HelpMeOnce's user avatar
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How to save the error: Array: No numbers in 'values', must provide a type

I'm a beginner of coding and GEE. I'm trying to extract the NIR and Red band time series data of each pixel in the survey area with cloud masked. However, when applying the code below I used to do ...
TIANRUN XUE's user avatar
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1 answer
88 views

Google Earth Engine time series analysis sediment error

I am a beginner in learning about GEE. I am now calculating sediment using Sentinel 2a satellite images in GEE, but I encountered an issue as follows: NDSSI Mosaic: Layer error: ImageCollection....
Ikrima's user avatar
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1 answer
144 views

Extract individual years from a time series raster

So there's this Sea Surface Temperature hosted raster layer on ESRI's Living Atlas and I am interested in extracting an individual year's data, for example 1981, from it and export it as a new raster. ...
Arthur_Morgan's user avatar
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98 views

Creating interactive chart in Jupyter Notebook using Geemap

This code applied the custom date to the x-axis. But I do not want this. I want to show the date on which the Image is taken by using "system:index" property of the Image. Also, This code ...
Muhammad Waqas's user avatar
1 vote
1 answer
122 views

Creating NDVI and Cloud Chart in Jupyter Notebook

I am trying to calculate NDVI and cloud pixel percentage. I have successfully done this but I am facing a problem in creating a chart of it in Jupyter Notebook, as I am new to Python so I tried ...
Muhammad Waqas's user avatar
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28 views

Show points (datum) animated in map QGIS

I have a layer with points, in the attribut the points have: Name Number Date Longitude Latitude I like to display alla the points in a time series only showing one point at the time from first to ...
jesper G's user avatar
1 vote
1 answer
126 views

Adding legend to a GIF in Earth Engine

How can I add the legend created to the GIF image? I have this code where I created a GIF with the ui.Thumbnail() function from an image collection and I have already added the years corresponding to ...
Mariana Guerra Lara's user avatar
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116 views

Image (Error) Parameter 'delta' is required. (GoogleEarthEngine)

I am trying to calculate NVDI Z-score from monthly mean and std NVDI, for the time series, but it showing this error: "Image (Error) Parameter 'delta' is required." My code link: https://...
Son Cao's user avatar
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1 answer
85 views

EEException: Image.bandNames: Parameter 'image' is required

I am trying to compute the NDVI index using the MODIS Landset in Python and to visualize it in a time series chart, but I am facing an error and I cannot understand where is the problem. This is my ...
gaia's user avatar
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55 views

Animated time series map in Power Point presentation

I am trying to create an animated map in Power Point. The map needs to visualize the states and municipalities that have adopted a specific policy over time. For example, when a state adopted the ...
Danny's user avatar
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40 views

Exporting NDWI time series using Google Earth Engine

This is the code I have written: // start and end dates var startDate = '2021-11-01'; var endDate = '2023-07-31'; // dataset var collection = landsat9.filterDate(startDate, endDate); // bounds var ...
Yanda Nhlapo's user avatar
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44 views

Updating Current map_start_time and map_end_time in QGIS

I'm experimenting with the temporal controller in QGIS in map layouts I want to current time frame (see below) To update the map_start_time and map_end_time in the variable section in the layout menu ...
Garth Cooper's user avatar
1 vote
1 answer
95 views

geemap - add text to Landsat time series and change the pace of images

I'm trying to generate timeseries from Landsat images based on the documentation of geemap. The problem: 'frames_per_seconds' parameter: When I create time series without the years as text, seems like ...
ReutKeller's user avatar
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59 views

Area calculation of MODIS snow cover

I am trying to Calculate NDSI Snow Cover Area in Percentage and Square Kilometers. But It code not working for me. Code giving me this error, "Error: Image.select: Pattern 'year' did not match ...
Muhammad Waqas's user avatar
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0 answers
43 views

How to do Neighborhood Summary Statistics by Year in ArcGIS Pro

I am attempting to calculate neighborhood summary statistics for groups of administrative polygons for each year between 2002 and 2018 in ArcGIS Pro. In ArcGIS Pro the Neighborhood Summary Statistics ...
Matt's user avatar
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1 vote
1 answer
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Select points based on their date & their location (they fall within a radius of another point)

I am studying lions, and their kill sites. I currently have around 900 historic kill site locations with the record date (with some attribute info). The data is old and I am looking to confirm the ...
Robert Le Brun's user avatar
2 votes
1 answer
77 views

Selecting rows in the attribute table depending on the time in QGIS

Related to this and this questions, having the following table, I would like to select just one row per minute: I have tried this expression, unsuccessfully: time = array_min (array_agg ( time, ...
Trikelians's user avatar
0 votes
1 answer
121 views

Unable to export time series from MODIS NDVI in GEE as transforming geometry into requested projection not working

I am trying to acquire MODIS NDVI (MOD13Q1 v061) time series using Google Earth Engine for certain locations for which I have the coordinates. My code looks as follows: ////////// Input // Specify ...
Toni's user avatar
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1 vote
1 answer
237 views

Joining a Smoothed Landsat and Sentinel-1 Time Series & Exporting Yearly

I am working on a script that needs to do the following; 1. smooth a Landsat time series 2a. apply a filter to remove noise from sentinel-1 using refined Lee 2b. smooth a sentinel-1 time series 3. ...
pbaltezar's user avatar
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1 answer
110 views

ComputedObject (Error) Error in map(ID=2015_01_05): Image.constant: Parameter 'value' is required

I would like to get 5 to 95 percent Day_1km_LST from MOD11A1, but it show this error: ComputedObject (Error) Error in map(ID=2015_01_05): Image.constant: Parameter 'value' is required The Google ...
kunsheng liu's user avatar
-2 votes
1 answer
94 views

How to extract LST from different points with its coordinates in google earth engine

I am trying to get from different points the LST values. The code works, however, I am not able to identify from which point it is extracting the values. I am trying to get the header of each point ...
JHONNY_2178's user avatar
1 vote
1 answer
211 views

Calculating cumulative sum chart using Google Earth Engine Python API

I would like to calculate cumulative sum chart for time series of 4 images time series sentinel-1. The formular for this is : S0=0, S1=S0 + (x1-x), S2=S1+(x2-x), S3=S2+(x3-x), S4= S3+(x4-x) where xi= ...
user30985's user avatar
  • 357
0 votes
0 answers
213 views

Using geemap to apply Otsu's threshold on time series NDVI slope

I'm running geemap on Google Colab, and try to apply Otsu's threshold to a Sentinel-2 time series NDVI, the threshold is when the NDVI slope is greater than 0.5. But when I try to apply the otsu ...
Xiaoqing Shen's user avatar
1 vote
2 answers
283 views

Arranging the CSV file of time series data exported from Google earth engine

I have a script that allows me to obtain a CSV file containing the time series of monthly MODIS NDVI values for several points. The problem here is that the CSV file I get is organized like this: ID ...
Bouram's user avatar
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2 votes
1 answer
364 views

GEE: How to sort ImageCollection correctly by system:index

I am very new to GEE and I have the following Problem: I have to create NDVI time series (with MODIS Vegetation indices) and compare the monthly mean value between 2001 and 2021 with the monthly mean ...
Cubozoa13's user avatar
0 votes
1 answer
258 views

How do you extract a time series of daily evapotranspiration in Google Earth Engine?

I would like to extract daily evapotranspiration for a specific date range, for example, 10/1/2012 to 9/30/2022. How can I specify the date range in the code? And then how can I get either the time ...
Mas's user avatar
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0 answers
52 views

Creating time series flood inundation map using NetCDF future sea level and DEM

I want to design a GIS tool that visualizes flood inundation maps for future sea level rise. the data that I need to use are NetCDF of projected Sea level rise for 10-year slices and DEM. The idea is ...
Sahar's user avatar
  • 1
1 vote
1 answer
76 views

Getting time series from different locations for various indexes

I am trying to get the time series for different points of interest, but I can only get one point location. Many of the examples that are on the web use points that are created during the code but in ...
JHONNY_2178's user avatar

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