Geographic Information Systems

Questions tagged [time-series]

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Series of data points indexed in time order.

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19 views

QGIS: prepare data for timeline animation

I have a data-spreadsheet containing a value-attribute that changes over time for a number of administrative units. I have a polygon layer as well with features for each of the administrative units. ...
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30 views

Implement system:time_start for NDVI trend analysis in GEE

I am developing a yearly NDVI trend analysis using Landsat data in Earth Engine over the last decades. My process is to add a NDVI band to every scene for each summer (green) month, then to reduce the ...
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30 views

Loop through time values in a raster brick in R

I have raster bricks of temperature and rainfall consisting of one layer for each month of the year. The raster brick looks like this: > tmx class : RasterBrick dimensions : 3875, 8017, ...
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1answer
29 views

Time Series Extraction of Modis LAI product (every 3 days a new satellite image) in small study area

At the moment I am struggling with a time series and the extraction of MODIS LAI data. I am using the band "Lai" from MODIS/006/MCD15A3H. My study area is small, so presumably, since the ...
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1answer
30 views

Extracting time series of one pixel from the SMAP soil moisture (soil moisture in %) product

Currently I am writing on my script to extract a time series of SMAP pixel values of the band 'smp', however, my studyarea is rather small and hence the script I found online in this community from ...
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41 views

Google Earth Engine timeseries chart

Using this Google Earth Engine code I am trying to create a line graph of the data for the specified date range. The result I got is not a continuous line graph and the exported value shows undefined:...
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1answer
30 views

Iterate through date columns in CARTO (frames, VL, etc.)

I currently have a data file that has columns for each day over an 8-month period. I am seeking of a way to create an interactive CARTO map that displays the change over time. I want to know if there ...
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1answer
40 views

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,...
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1answer
27 views

Change detection using different satellite imagery

I'm struggling to acquire Landsat satellite images to carry out time series analysis for a wetland in Liberia as part of my thesis work. Originally, my plan was to acquire images for 1980, 1990, 2010, ...
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41 views

Accessing data from time series in GEE

I have a code for NDVI time series from an image collection. This code prints the time series in a table or a chart. Is there a way to access the values in the table of the time series in google earth ...
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62 views

How to extract multiple values from specific coordinates and dates from a NetCDF time-series in R?

I need to extract information of a series of oceanographical variables in netCDF format for specific coordinates, each coordinate in a specific date as well. I'm using R and this is an example of my ...
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10 views

Stepwise regression method in GEE

I would like to use the stepwise regression method to compute time series analysis in GEE, is there a way to implement this regression model in GEE.
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1answer
43 views

Pixel-wise correlation using Google Earth Engine

I am working on LST and NDVI correlation. Currently, I was able to get the correlation of LST and NDVI however, this was done using the average of the whole study area -- I first set the boundaries, ...
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24 views

Create Time Series Chart of NDVI (based on Landsat 5) of a National Park in Germany with Google Earth Engine

So this is my code so far: My Questions: How do I name the title and x-axis and y-axis? It isn´t working with .setOptions({title: 'NDVI Bayrischer Wald Landsat 5 1984 - 2013'}) unfortunately. How do ...
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1answer
23 views

How can the maximum temperature (tmmx) band in the TerraClimate GEE dataset be interpreted?

This question was already asked here. But there was no correct answer. link I'm using the precipitation, maximum temperature (tmmx) and soil moisture in the TerraClimate dataset in GEE. I cannot find ...
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1answer
38 views

Derive the statistical values from the time series data

I am trying to derive 5 statistical values: 1) maximum; 2) minimum; 3) standard deviation; 4) medium; and 5) 1090 interval mean from the time series data. And I know there are existed functions in GEE ...
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1answer
24 views

Time series chart CHIRPS data in Earth Engine

I am trying to derive a time series chart of the CHIRPS daily data set (precipitation) at a specific location. However, I get the following error "Error generating chart: No properties to chart.&...
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1answer
32 views

ArcGIS JS API - time series with heatmap

I am trying to create a time series of covid data moving across the globe. For now, I'm trying to use a heatmap to do it. Using this COVID19_Time_Series_Combined (which pulls data from here), I ...
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21 views

Iterating over features in Google Earth Engine

I am using the Zonal Time Series plotter from the LandTrendr scripts to plot an NDVI time series for a geometry. I would like to modify the script to be able to loop through objects in a table, ...
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1answer
20 views

How can I remove incorrectly selected images from collection to eliminate gaps in Google Earth Engine time series chart?

I am working on creating a tool that computes a number of different vegetation indices from Landsat across the state of Montana in order to allow users to examine time series charts for user-specified ...
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61 views

GEE - Applying Savitzky-Golay filter after LS8 NDVI calculation for smoothing curve generating

I'm new in GEE platform, thereby trying to generate a smoothed LS8 NDVI time series by using the Savitzky-Golay filter. I'm following https://groups.google.com/d/msg/google-earth-engine-developers/...
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1answer
74 views

Problem generating NDVI chart in GEE

I'm new to GEE. I'm currently working on NDVI data analysis. So this is my code for MODIS NDVI. I already run the NDVI scale factor function and do the image collection, Divide by 10000, in images ...
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1answer
55 views

Time series chart of EVI (Landsat 8) for a single pixel in GEE

I'm trying to chart out EVI for a single pixel(roi) over time. Basically trying to do what this link does for NDVI and apply it to the EVI available from landsat 8 imagery, but have no clue how to do ...
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13 views

TIMESAT Quality Data

I am trying to analyse time-series images from MODIS (MOD13Q1) in TIMESAT to clear the noise and get an output. With EVI images I got also QA. I have to use it because there is often a cloud cover in ...
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1answer
62 views

Remove Images from Image Collection in Google Earth Engine?

In the below code, I'm going to remove some images from image collection by if condition in .map() instead of filter.neq(), what should I do for this purpose? Map.centerObject(table); Map.addLayer(...
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55 views

File format for specifying GPS motion as a function of time?

What file format can specify GPS lat/lon/elev time history? If I want to specify vehicle or pedestrian motion along a waypoint path, what is a compact way of specifying this? .kml has waypoints but no ...
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43 views

How to skip null images in Google Earth Engine?

I've called sentinel2 image collection but I don't know how can I skip null images instead of filter.neq(): code link: https://code.earthengine.google.com/b762152c33e6eddca96c2006e62eed54 var s22 = ee....
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34 views

Predicting the raster from the time series of NDRE using non-linear regression model in R

Here I have posted the code and got the stacked image of NDRE index by using get_filenames function and then I stacked, there are 4 layers in the stacked image I want to come up with the predicted ...
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10 views

Creating and Labeling time series (features)

I am trying to carry out crop type identification using optical remotely sensed data of Sentinel-2A. I am new to both fields (remote sensing and machine learning) and I want to use time series (NDVI, ...
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67 views

Identifying annual first day of peak NDVI in Google Earth Engine from Sentinel 2 images

I am trying to make a map showing the annual first day of peak NDVI over an agricultural area over multiple years using Sentinel 2. The final result should be similar to this on a smaller scale. https:...
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1answer
115 views

How to solve bitwise error in Google Earth Engine?

I've wrote the below code for chlorophyll detection using MODIS ocean reflectance data but I've got this error: Image.bitwiseXor: Bitwise operands must be integer only. code link: https://code....
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17 views

Trouble applying bfastmonitor function in R

I am trying to apply a BFAST monitor to my time series but keep getting the following error. What does it mean and how can I fix this? Error in if (!foundBreak & any(abs(obj$process) > ...
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17 views

NDVI Time Series over Feature Collection of districts

I am very new to google earth engine and I am having trouble creating a time series of NDVI for a feature collection. I am working with the Landsat 8 NDVI Layer "LANDSAT/LC08/C01/T1_32DAY_NDVI&...
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1answer
40 views

Building GEE timeseries for multiple locations

I want to build a timeseries chart for multiple points. Is it possible to use ui.Chart.image.series and have different lines for different points? They are not regions, so I don't think ....
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1answer
45 views

Adding time as 'year' band to image collection

I have uploaded 35 images (annual maximum NDVI) to GEE and put them manually (drag and drop) together to an image collection. There is no time band, but for the ee.Reducer.linearFit() function, I need ...
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18 views

Stitch together images taken at similar times from different satellites

I assume this is a very common problem, but I don't know where to start. Given two Google Earth Engine image collections (both containing a timeseries of images and multiple scenes), how can I ...
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17 views

How can I plot the availability of (cloud-free) data in a satellite image collection in Google Earth Engine?

I have often worked with time series, including the masking of clouds in GEE, including using the ui.Chart.image.series() function to plot time series for the values of a given pixel. What I haven't ...
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20 views

Aggregating multiple time series to match MODIS timestep in R

I have multiple time series data for precipitation and evapotranspiration that are irregularly spaced. All but one of the datasets are daily products, but sadly one is a MODIS product that has ...
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1answer
207 views

GEE – Smoothing curve of detected water area

I am trying to plot the time series chart of the detected water area by otsu's method in Sentinel-1 images as a smoothed average curve. I found two approaches to this for the Google Earth Engine: ...
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30 views

Memory limit and computation time out for NDVI Map in Google Earth Engine

I am trying to get an NDVI time series over a specific area of the Everglades and have the below script. When I try to run it I keep getting a memory exceeded error and also a computation time out ...
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1answer
53 views

Is there a more direct approach to time series correlation in the Google Earth Engine?

I want to know how the time attributes of ee.Image and ee.ImageCollectionobjects exist in Google Earth Engine. I am looking for whether there are operations on time series in GEE, such as resampling, ...
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1answer
37 views

What is causing a delay in the refresh of Time-series charts in Google Earth Engine user interface?

I am exploring the User Interface tools in Google Earth Engine and using them to make time-series charts of vegetation information upon map clicks. When I run the code, the first time, everything ...
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1answer
61 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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36 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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11 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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1answer
55 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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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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18 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
89 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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31 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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