Questions tagged [time-series]

Series of data points indexed in time order.

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26 views

Error: No features contain non-null values of “system:time_start” (Earth Engine)

I am trying to print a NO2 time series at a user specified point. However, this time series keeps saying: Error generating chart: No features contain non-null values of "system:time_start". Any ...
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16 views

Time Series of buffered geometry point in Earth Engine

I am trying to plot a time series of MODIS Aqua chl from a geometry point that has been buffered. The single point works but every time I used the buffered point it says: Error in map(ID=A2018001):...
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8 views

Correlation-Calculation with missing values

I want to do a pixel-based analysis to detect the crop-type over a year using HLS data. So far I managed to get curves for NDVI of different crop-types over a year and my data for each pixel. Since ...
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0answers
13 views

I want to plot the curve of the Shoreline sentinel-2 Time Series in google earth engine

Hi sir since i'm working on shoreline forecast in cameroon coast using shorefor model. To run shorefor model i need in input, a time serie of wave data climate (significant wave height and peak ...
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2answers
35 views

Summarise duration of points within polygon

I have table with points that are gps coordinates for multiple vehicles. I have another table of multiple polygons that the vehicles travel through. I’ve managed to write a python script that ...
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0answers
22 views

Export Time Series of Images

I got an error with this code. I want to download images with all bands in a selected area along with the metadata files in Google Earth Engine. // Load a Landsat 8 image collection. var collection =...
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20 views

Summarising multilayer raster file without reading whole dataset

Is there a computationally 'lite' way of processing a multiband raster dataset (in this case a grib file, but the point stands for any file type) without reading the whole thing in as a brick first? ...
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12 views

Rasterbrick NDVI smoothing

I've scoured the internet for an answer to this, but the methods I've read up on either aren't applicable or just aren't working. I'm currently looking at the NDVI timeseries over 19 years worth of ...
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1answer
29 views

How to select features in a feature collection simultaneously row by row in Google Earth Engine?

I try to find a correlation between a linear trend of two NDVI time series before and after a specific day in time. And that I want to repeat (iterate/map?) for a lot of points globally distributed. ...
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10 views

Folium for point data time series?

I have been searching this around for a while without success. But sorry for potential re-post. I have multiple layers of data points (coordinates), where each layer showing locations of an event in ...
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1answer
31 views

Create time series chart with linear trend using NDVI values at specific locations (9000) stored in a feature collection in Google Earth Engine

I try to find a correlation between a linear trend of two NDVI time series before and after a specific day in time. And that I want to repeat (iterate/map?) for a lot of points globally distributed. I ...
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0answers
21 views

Time Manager animations run too fast to simulate real time

I am using the Time Manager plugin to visualize a set of points with a corresponding start and end time. I can see the points correctly on the map at the correct time. My question is about the ...
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1answer
90 views

GEE check only one sentinel tile instead of checking all of them when the featurecollection is in many tiles

I have code in GEE that creates image collection based on geometry, calc for each polygon the mean value of NDVI for each image, creates new featurecollection with the image as title, and then the ...
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2answers
26 views

Google Earth Engine - Chart APP

I made a script that makes a chart of the NDVI values by dates for different sites. When I create an APP to share that chart, the only thing visualized is the MAP. How do I create an APP with only (...
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1answer
20 views

Google Engine - NDVI time series by region - LineChart not connecting dots

I created a stack of NDVI images, and also have several polygon. When I plot the time series, points show up but only a few connects dates to each other. I am using the ui.Chart.image.seriesByRegion()...
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1answer
53 views

SMOS time series and export to CSV in GEE

I'm new to Google Earth Engine. I'm trying to create a time-series of SMOS for a point. I have selected the coordinates of the point and am now trying to export the table as a .csv. My script so ...
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1answer
41 views

Applying Landsat scan line correction on a time series

I am currently trying to adapt the scan line correction (SLC) for Landsat 7 on my timeseries. My code is based on the stack exchange question how to do the SLC, but I am not managing to apply it as a ...
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1answer
59 views

Iterating time series extraction of all bands in an Earth Engine weather data set using a feature collection of polygons and dates

I am trying to automate a time series extraction script I wrote in the GEE JavaScript API to run over a shapefile of polygons with start times and end times but am unsure on how to accomplish the ...
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0answers
29 views

Create an animated proportional symbol map

I have a number of locations (point data) Each location have an attribute of different values over time (different columns) I want to make an animated map with proportional symbols showing how these ...
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1answer
53 views

Exporting LST median values of a time series in Google EE to CSV file

I'm new to Google EE and I'm still figuring out how this works. I want to export into a table the median values of LST from a shapefile for three years. I can do it for one year but If I set the time ...
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1answer
57 views

Error generating chart: No features contain non-null values of “system:time_start”

I know there are many posts abbout this but for some reason those solutions doesn't work for my code. I'm trying to create timeseries for an imagecollection which was created using image expressiones....
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1answer
21 views

Calculating LST time-servers graph

i am trying to compute the time series graph of the particular location i m getting this error no idea what to do i m using "MODIS/006/MOD11A" var lst = lstImg.select('LST_Day_1km') ....
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2answers
258 views

Export ERA5 Image Collection data from Google Earth Engine

I'm trying to export the ERA5daily Image Collection data from Google Earth Engine using the GEE API in python. I need the Max Temp, Min Temp and Average Temp for the time between 1979 and 2016 (in the ...
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0answers
23 views

Import and go through a large batch of Landsat images in QGIS?

I'm trying to reconstruct a glaciers frontal evolution through time. To do so I use a whole lot (70+) of Landsat scenes which I got from USGS Earth Explorer. I would like to visualize them as false ...
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0answers
36 views

What happens if some polygons are empty in reduce() in Google Earth Engine

I am drawing the NDVI time-series trend for two types polygon in my target area using Sentinel-2. I don't know why I miss one day's NDVI mean. Is it because some polygons are unmasked after cloudrmove?...
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99 views

Multi-temporal classification in Google Earth Engine - clustering and grouping based on time sero

I am working on my master thesis on multi temporal classification of LULC using S2 imagery in Google Earth Engine. The goal: to distinguish urban area from the landscape in the Inner Niger Delta. ...
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0answers
150 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 ...
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2answers
182 views

Max NDVI per month & year using Google Earth Engine to CSV - CSV gives -999 values only

This question refers to Calculating NDVI per region, month & year with Google Earth Engine I have modified the code posted by @Kel Markert at https://code.earthengine.google.com/...
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1answer
139 views

Calculating ERA5 2018 monthly 2mt temperature anomalies in Google Earth Engine

I am trying to calculate in Google Earth Engine using ERA5 the monthly 2mt temperature anomalies from January to December 2018 compared to the long-term reference period of 1981-2010. In other words, ...
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0answers
25 views

Landsat L1GS product processing to change detection analysis ready state

At high latitude area of Svalbard Norway, one can find Landsat 8 data processed to L1TP level. With previous Landsat missions, this is not the case. Landsat 7 data are processed to L1Gt level and ...
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1answer
133 views

Max Pixel Value Error in Google Earth Engine

I've written below code in Google Earth Engine for carbon monthly product from sentinel-5 but when I click on the run button for save in Google drive, it shows error. How can I solve this problem? ...
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0answers
151 views

Google Earth Engine: change multiple labels in legend for time series by region graph

I am producing a time series graph comparing the mean NDVI in two different types of regions. Both types exist out of multiple polygons (MultiPolygons). However, I keep failing to name these two ...
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0answers
57 views

Finding movement starting points in QGIS

I have multiple csv files (24+) with objects categorized by IDs, with their latitude and longitude, and timestamp. Each csv with a different timestamp specified in a column. There are multiple rows ...
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0answers
133 views

Export landcover area after classification - Google Earth Engine

I want to make a time series analysis of landcover change with Landsat 7 images. After I classified them using MODIS land cover classification, I want to export the change in land use. For this, I ...
2
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1answer
139 views

GEE, pixel based SD over time series Sentinel 2 NDVI

I would like to calculate the SD of a NDVI value by pixel over a time series using Sentinel 2. It is to identify pixels with more or less variations over a specific time period. The expected output ...
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1answer
99 views

Tile error Google Earth Engine ; Image 0 does not have a system: time_start property

[![I am getting this error in my code,I want to analyse time series, Any suggestions how to deal with it?][1]][1][! [][1]][1] [1]: here is the code link https://code.earthengine.google.com/...
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1answer
32 views

Coordinate Point Drops on timeseries in QGIS [closed]

I have timestamp data for every minute of a day (1140)for multiple objects by id, with a corresponding lat long. I want to get the time in which an id disappears off the map or off the csv. What would ...
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2answers
300 views

Adding band value as a property in Google Earth Engine

I have an image collection of different anomaly values for a specific time period. I'm simply looking to count how many of these values are over 1 in my time period. This is my code // create ...
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0answers
19 views

Filter out masked pixels for time series plot

I am trying to create a time series of chlorophyll over one coordinate from a Landsat 8 Image Collection. I used a cloud mask on all images which causes some of the pixels at my coordinate to be ...
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0answers
72 views

Calculating the mean value of a raster stack using numpy

I am calculating the mean value of a stack of images. I created a virtual raster which is the stack of 68 sentinel-1 images. I want to calculate the mean value for every pixel. Here is my code: ...
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1answer
231 views

Creating NDVI time series from single polygon of shapefile using Google Earth Engine

I am new in Google Earth Engine, I am trying to plot ndvi timeseries from a single polygon of shapefile, but when I run the code I get "Error generating chart: Collection query aborted after ...
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0answers
110 views

Google Earth Engine: cumulative iteration of weekly mean anomaly

Using the link here I've managed to calculate a weekly mean anomaly for several regions of interest. I'm hoping to calculate a cumulative mean anomaly, then work out how many consecutive weeks have ...
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0answers
38 views

Truncated time series table output over multiple polygons using Google Earth Engine

I'm facing issue to export a CSV table of a time series from multiple polygons in GEE. Using few polygons it works well, but when I'm adding more polygons, the output is truncated. My CSV has Polygon'...
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2answers
207 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 ...
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0answers
18 views

Creating daily grid from table using ModelBuilder?

I´m trying to create a daily grid file for precipitation from a xlx table table that has X, Y, P1, P2,..., P365 columns and n gauges rows. I´m new in ModelBuilder but it seems this may be the best ...
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0answers
47 views

Google Earth Engine: calculate number of weeks where SST over a threshold in past 12 weeks

I've been using the MODIS-Aqua/L3SMI dataset to investigate sea surface temperatures (SST) for a specific region. What I'd like to do is for a specific time epriod (could be day, week or month), find ...
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1answer
478 views

Google Earth Engine : Get “table” and not a Chart, of time series multiple polygons

Based on the example mentioned here, and based on the answer provided below, // Define a FeatureCollection: regions of the American West. var regions = ee.FeatureCollection([ ee.Feature( // San ...
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35 views

Google Engine: Time Series Analysis with multiple point data [duplicate]

I have multiple points representing different crops for an area (say 100 per crop, and 5 types of crops). I compute the Sentinel2 NDVI for a period of one year. Even if I filter for just one type of ...
1
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1answer
53 views

Setting correct start and end time series for Savitzky-Golay in R

I am trying to smoothen my raster stack using Savitzky-Golay method. I am following the workaround from HERE but my problem is setting start and end of my time-series raster. My series of images were ...
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0answers
46 views

Monthly Water Area Monitoring in Google Earth Engine?

I've computed water area for each 8 days for about 20 years. I don't know how can I compute monthly area for these years? or How can I change 8 days product to the monthly in this code? code link: ...