Questions tagged [time-series]

Series of data points indexed in time order.

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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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How to implement Landtrendr algorithm by importing image asset in GEE? [closed]

I have time series raster layers (count:28) for 1995-2022 time period representing percentage of live vegetation per pixel per year. My requirement is to do temporal segmentation looking into ...
Alla'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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Set time filtering properties for WMTS layer with ArcPy [closed]

I am looking for a way to programmatically set time filtering settings for my WMTS layers in ArcGIS Pro so that I can use them in a time series. It is a pain to set up manually when you have hundreds ...
JUNGLE's user avatar
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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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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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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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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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60 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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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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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
69 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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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
65 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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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
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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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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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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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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
73 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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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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37 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
61 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
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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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Animating time series and time-dependent symbology

I am looking to create an animation in QGIS of GPS collar data, showing movement over time. I would like to make each point fade away as the animation progresses, but am having an issue with the ...
Kelsey Green's user avatar
1 vote
1 answer
186 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. ...
pbalteza's user avatar
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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
-1 votes
1 answer
74 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
161 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
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181 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
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0 answers
9 views

How quickly view many symbolized fields of the same shapefile in ArcGIS pro or other software

I have a shapefile that represents a grid to a numerical flow model. There can be 100's of fields in the shapefile that represent different values in each polygon of the multipolygon. I'm trying to ...
Nick C's user avatar
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1 vote
2 answers
196 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
254 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
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54 views

Export MODIS MOD16A2 data from a graph in GEE to a CSV file directly on the google Drive

How can I export the average MODIS AET values for an ensemble of points defined by a shapefile, obtained as a graph using GEE, directly to my Google Drive in CSV format? I have attempted to use the &...
Bouram's user avatar
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1 answer
190 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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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
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1 vote
1 answer
67 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
1 vote
0 answers
137 views

Incorrect LST values for MODIS and Landsat in GEE

I am trying to plot a linear regression model using MODIS LST values and compare it with a Landsat 7 LST time series. However, I am not getting the correct values in the plot; the range of values ...
Ali Turab Hani's user avatar
0 votes
1 answer
318 views

MODIS LST time series for daily average

I am trying to compute and plot the linear regression model for MODIS terra LST values. I have successfully plotted the "LST_Day_1km" band by using the following code: var terraD = ee....
Ali Turab Hani's user avatar
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0 answers
95 views

Add timestamp label to GIF generated in EE Python API

I have generated a GIF using GEE Python API with Planet Labs free tropics satellite imagery from the NICFI program, and have tried to add a time stamp in my GIF animation but the GIF is not showing ...
Adi's user avatar
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1 vote
0 answers
33 views

Video Exporting Black/White Odd Image Landsat 4/5 and other Landsats in GEE

I am able to get variations of this code to work with Sentinel images, and with a heatmap image collection from Yale. However, I have tried with every landsat collection, and I always get videos that ...
coolflippers's user avatar
1 vote
1 answer
216 views

How to create line time-series plot using .tiff images in R

I have monthly .tiff images from 2000-2020 in following way: 200001 200002 200003 . . . 202012 (format is yyyymm) Using the code given below, I am able to calculate monthly averages but I am not able ...
Alexia k Boston's user avatar
3 votes
1 answer
449 views

How to extract GPM precipitation data on multiple location points using Google Earth engine

The script below allows to extract monthly precipitation data for a single shapefile point. how can we modify it so that it can extract data for multiple points contained in a single shapefile. The ...
Bouram's user avatar
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0 votes
1 answer
438 views

How stackApply function in R works to calculate monthly mean of daily .tiff files?

I have various .tif files (3 files per month) from 2006-2010. Nomenclature of files are as following: 20060103 20060113 20060124 20060203 20060213 20060221 ... ... ... 20101224 I want to calculate and ...
Alexia k Boston's user avatar
1 vote
1 answer
72 views

'Error generating chart: No features contain non-null values of "system:time_start"'

How do I get surface temperature variation with a time series chart? I have tried the same code on different data but it does not work with this one. var dataset = ee.ImageCollection("JAXA/GCOM-C/...
JHONNY_2178's user avatar
1 vote
1 answer
92 views

Why can I add data as a map layer, but not be able to export it in GEE?

I have put together a script in earth engine with the purpose of producing an NDVI max time-series collection with relevant masks applied from 1984-2022, then reducing this using Kendall's correlation ...
Jack S Marchant's user avatar

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