Questions tagged [time-series]
Series of data points indexed in time order.
329
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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 ...
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1
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16
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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 ...
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20
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'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/...
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1
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24
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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 ...
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71
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Check whether an element is maintained over time [closed]
I have a 6 years time series with a thousand of detections of elements in cities (all databases have the same structure).
Year
geometry
Area-m2
2000
POINT (-122.38705 37.72066)
37.326319
2000
POINT ...
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1
answer
29
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UI Charts - Google Earth Engine Python API
I am using GEE Python API. I want to create a time series chart but the documentation says:
Caution: the ui.Chart widget is available for the JavaScript Code Editor API only.
How do we create in ...
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27
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What additional corrections are applied to Landsat data when it is ingested into Google Earth Engine?
I recently contacted the USGS regarding the Landsat data available via the Google Earth Engine platform. During the course of email correspondence, a USGS staff member shared that the Google applies ...
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23
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Have multiple NDCI values at the same day in Time series chart (GEE)
I tried to generate the time series chart for NDCI to see the changes in 2017 but it shows multiple values for the same day. The chart looks so dense and ugly. How can I get the mean value for a month?...
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24
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Removal of atypical images from a time series NDVI sentinel-2 Google Earth Engine
I'm new to GEE.
How can I automatically remove by scanning sentinel-2 NDVI images from a collection of images, which contain outliers in their time series by taking into account the before and after ...
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40
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Interval plots of min, max, mean, and stdDev in Google Earth Engine
I'm new to GEE.
How can I create a Sentinel-2 NDVI time series chart showing the range of min, max, mean, and stdDev in the date range 2022-01-01 to 2023-01-01?
I have tried to adapt some code that I ...
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How to solve the error of 'No features contain non-null values of "system:time_start".' in GEE
I'm trying to create a time series chart for SST and NDCI retrieving from Modis and Sentinel2 respectively by using the below code, but I get an error of No features contain non-null values of "...
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27
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NDVI time series image generation using sentinel 2 data for 15 days interval
I'm trying to generate a time series NDVI image using sentinel 2 for every 15 days interval, due to the unavailability of <10% cloud cover image for a certain period. My code is thronging an error:...
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Problem with 2022 NDVI time series
I calculated seasonal NDVI Time series (1 image for each season) from 2017 to 2022 using Sentinel-2 L1C images (which I converted to L2A using Sen2Cor), the first 5 years where ok, but the last 3 ...
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39
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Using ee.Reducer on monthly time series with missing data
I am trying to generate a value of mean MODIS LST for each month in a time series for a feature collection, as well as an overall timeseries minimum and maximum LST for each month of the year. When I ...
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ASTER 15m images
I want to do a time series analysis from 2010 to 2022 of Tangier-Morocco, using ASTER 15m images, I visited a lot of websites (USGS-earthdata-lpdaac) I found a total of 126 images, 8 of them are ...
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Adding system:time_start to a reduced modis collection?
I need to add a system:time_start to a reduced modis collection. I am trying to get monthly maximum NDVI values but the system time start gets lost during the reducing processs and i am unsure of ...
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2
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46
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Detecting break point in Sentinel-2 time series [closed]
I am trying to create a simple method for wildfire detection using Sentinel-2 time series via GEE. The method is based on the decrease of the Normalized Burned Area (NBR) Index when a fire occurs.
So ...
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2
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1
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92
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Export a CSV file to Drive with a column ID from a FeatureCollection in GEE
I need help, please. I exported a CSV file with evi2 time series from Sentinel-2 for multiple points using GEE. Each point (n = 2421) has a sample ID. I defined the table with coordinates and its ...
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41
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Estimation of NO2 Before and After Covid 19 Using GEE
I am working on trend analysis of NO2 but the chart produced have different minimum and maximum values of tropospheric column number density and, I cannot built a continuous pre, during and lock down ...
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29
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How to calculate mean monthly NBR values from MODIS Imagery for a 5 year period in GEE?
I'm new to coding, and I tried calculating Mean monthly NDVI values for a specific time period from the code found here. When I used the same for NBR by changing the band values it didn't work. I may ...
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1
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34
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Error while Exporting from Google Earth [closed]
I was trying to find a time series chart of SO2 in my region of interest. But after generating the chart I find it difficult to export to drive.
Here is my code
What is wrong with the code?
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23
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Google Earth Engine chart y-axis label value set [duplicate]
I have a line graph consisting of drought time series and I want to increase the label values on the y axis of this graph by one by one, not by two as in the image. How can I do this in Earth Engine?...
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Use several colours in Decorations - Title Label in QGIS
I have been trying to dynamically display labels based in the Decoration Title Label in QGIS, as can be seen on this answer by the user Kasper.
What I am trying to achieve now is to change the colour ...
- 416
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108
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GEE App: How to generate the time series chart of a vegetation index based on the ui.Select and drawings tools
I have different vegetation indexes and would like to generate a time series chart of a specific vegetation index based on the user's selection and regions defined by the user's drawing. I would like ...
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3
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142
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Dynamically displaying feature labels in QGIS Decorations Title Bar
Related: Display label depending on timedate attribute used by Temporal Controller
Following the linked thread, I have managed to display labels according to what Temporal Controller prompts using the ...
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1
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58
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Enable time dimension in GeoServer on imageMosaic coverage
I am trying to enable time dimension on my imageMosaic which consist of TIFF files served from S3. I've been following different GeoServer tutorials for setting up the mosaic:
https://docs.geoserver....
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14
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Publishing time enabled overlapping point dataset as ArcGIS service
I need to publish a geoservice based on ArcGIS Pro 2.9, and to publish to ArcGIS Portal 10.7
Input Dataset specification
20'000 time series records but for only 200 locations (points)
Requirements
...
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100
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how write loop for time series in google earth engine
I'm trying to calculate the windspeed from a pixel many times changing the date range from an image collection. I Don't know how write loop for that:
var fc = ee.FeatureCollection('USDOS/LSIB_SIMPLE/...
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37
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Digitizing on raster WMTS time series and storing time information in attribute table using QGIS
I have loaded a raster time series in QGIS as a WMTS layer. The Temporal Controller works fine and I can navigate through the different dates.
Now, I would like to digitize polygons on different time ...
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258
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Monthly NDVI Time Series from Sentinel 2
I am trying to extract monthly NDVI time series as CSV file from sentinel2. When I run the exported CSV file in task bar, it fails after some time and throws an error given below:
"Error: Image....
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91
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How to get rolling count of masked pixels in Google Earth Engine
Using the Global Forecast System from NOAA, which provides relative humidity (RH) estimates several hours in to the future (up to 16 days to be exact). I create a binary of the RH, call it leaf ...
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I have a lot of images netcdf4 in my Time series (1979 to 2019) where I want to extract the values at different coordinates?
There is a similar solution by @chaobing zhang here: Extract time series values from a 3D (lon,lat,time) NetCDF file using Python
I want the solution to loop all the images and extracting the values ...
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64
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Extracting maximum value in Soil moisture timeseries and exporting image using Google Earth Engine
I have a time series code that shows soil moisture in an area but I want to get the highest moisture obtained during the time period and export it as an image. I have tried but seems like my code is ...
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33
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Mapping series of points in CSV file [closed]
I've got a CSV file with bird-tracking data in. Each bird has its own unique ID, and has 1 or more unique flight IDs. Each flight ID has several timestamped lat/long points (digital degrees) and it's ...
2
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1
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183
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Geometric median image compositing in Google Earth Engine
I am trying to make an image composite from Landsat 8 collection 2 based on Geometric Median (GM) algorithm. This is another option (like median or medoid) for creating a composite for time series ...
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ee.Reducer.max() does not work over feature collection
My script is here.
var chirpsCol = //ee.ImageCollection('LANDSAT/LC08/C02/T1_L2')
ee.ImageCollection("UCSB-CHG/CHIRPS/DAILY")
.map(function(image){return image.clip(geometry)})
....
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1
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52
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Centred Moving Average
I'm trying to retrieve the trend component from NDVI (MODIS) time series using the 4 centred moving average in excel, my problem is the time series has some holes in it (missing dates)
I want to know ...
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1
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349
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Run a for loop in R to calculate monthly mean from an Excel sheet
I want to calculate the seasonal mean from monthly long-time temperature data.
series<-data$Temperature
p=5
new=NULL
for(i in 1:length){
ydata<-series[((i-1)*p+1):(i*p)]
yavg<-mean(ydata)
...
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0
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125
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Snow cover timeseries in GEE - MODIS NSI - shows zero snow in winter in Norway
I want to make a simple time-series of snow cover in a study area in Norway.
I modified the script below from another post: Generation of snow cover area time series in GEE using MODIS Snow Cover ...
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190
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Calculating yearly air temperature mean for selected region ERA5
Using ERA5 data, I am trying to extract the average annual temperature for a region. I am interested in a single value for each year. This is the code I tried to use:
//Define area
var area = ee....
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2
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306
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Google Earth Engine: running NDVI analysis by month
How would I go about making my analysis values per month rather than per year
Create date filter and vector of years for analysis
var date_filter = ee.Filter.date('2010-06-22', '2022-06-22');
...
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228
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Smoothen the Sentinel-1 Time Series Graph Using Google Earth Engine
In order to study the growth pattern of crops, I tried to smoothen the Sentinel-1 time series graph using the following code but got the error.
Error:
ImageCollection (Error)
ImageCollection.reduce: ...
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221
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Coefficient of Variation Timeseries in Google Earth Engine
You can build a timeseries for mean or standard deviation band values over a geometry in Google Earth Engine (see code below). However, there does not appear to be an option to plot a timeseries of ...
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116
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GEE add a constant median band representing the median of pixels within a multipolygon
I have a time series of Sentinel-2 images and I'd like to get a single median EVI index value over a multipolygon representing known land-cover areas in each image and set that as a constant band ...
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34
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Debugging copyproperties when image is null, getting time series for each month
I'm trying to make a collection of Landsat8 images for each month of each year, copying the properties of system:time_start of the first image of each respective month, however some months don't have ...
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67
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Calculating temporal monthly lag between 2 datasets in Google Earth Engine
I want to calculate how many months pass before the terrestrial water storage reacts and peaks in reaction to precipitation using an raster, time-series Image Collection with 2 bands namely '...
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322
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Daily IMERG timeseries in Google Earth Engine
I am trying to make an area-averaged time series of daily precipitation (IMERG). I'd use NASA Giovanni, but I need to be able to use my own shapefiles to average the areas. Given the size of the area ...
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38
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Specifying particular year in multi-year time series raster image service when attempting spatial join using ArcGIS Pro
I've been trying to grab land use data over a period of time within a set of polygons, but when attempting a spatial join (either through the right-click menu, through the specific tool or through an ...
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23
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Generating variable that counts number of points inside buffers in monthly intervals
I am using ArcGIS Pro.
I have Sales locations and opening dates (and closing dates if applicable) for retailers in an area.
I want to draw buffers and then count the number of other retail locations ...
1
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1
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181
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Error Generating Time Series Chart: No features contain non-null values of "system:time_start"
I'm getting the following error while generating the time series chart for Image Collection:
Error: No features contain non-null values of "system:time_start".
Here is the code that ...
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