Questions tagged [time-series]

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16 views

MMQGIS or Timeseries: Exporting paths to CSV

I have a csv with columns for id, latitude, longitude, timestamp. Many of the points (or ids) do not change latitude/longitude over time, others do. How do I filter out those ids and lat/longs for ...
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1answer
29 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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22 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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49 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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21 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 ...
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1answer
49 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
38 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
30 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
55 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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16 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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37 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
83 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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41 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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33 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
93 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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16 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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34 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
116 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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26 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 ...
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1answer
34 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
34 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: ...
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1answer
44 views

Retaining last position of vessel position in geodataframe including time series?

I have geodataframe about vessel position which include unique code called 'mmsi' and time series. In the following 'mmsi' column has more than 1 'mmsi' code and time series (* mark). mmsi ...
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107 views

Performing time series supervised classification on Google Earth Engine?

I am quite new as I only use google earth engine for a couple weeks. So if I missed anything feel free to advise The goal want to achieved is to perform time series classification on Google Earth ...
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44 views

Creating time series using GEE for too large polygon [duplicate]

I'm trying to create a time series chart of Normalized burn ratio (NBR) , but my polygon is too big and I get the next error message: Error in map(ID=0): Image.reduceRegion: Too many pixels in the ...
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1answer
25 views

Making Time Series of different Class areas in ImageCollection

Here I can only calculate the area of the four classes(classes:0,1,2,3) of the surface water for one year. Is there any way to calculate areas of the four classes from 2000 to 2015 and export it as ...
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1answer
30 views

TIme Series Analysis with Point Data

I'm using ArcGIS 10.3, and I have 20 shapefiles, each representing 1 year worth of data over the same study area, that contain postal code point data, with each point having some NDVI values (growing ...
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1answer
83 views

GEE Change the number of pixels on chart

I'm trying to create a time series chart that will tell me that mean precipitation for a given imageCollection, but my polygon is too big and I get the next error message: "Error generating chart: ...
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1answer
71 views

Create mask for each layer of time-series raster in R

I'm trying to create a mask using each layer of my stacked Pixel Reliability QA rasters in R. I'm trying to exclude pixels with values greater than 1. I will use them to mask my vegetation index time-...
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2answers
70 views

stack() in R does not include all .tiff files in my directory

I am trying to perform stack() in R using enhanced vegetation index (EVI) time-series maps but it doesn't include all the .tiff files in my directory. Here's the list of files when I dir(files.evi): ...
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1answer
125 views

Time series analysis of NDVI

I want to create a chart of annual NDVI for a specific region. The output should be one NDVI value for that region for each year. I tried the following code and so far was able to get an image ...
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0answers
92 views

Otsu's method combined with water index to calculate the time-series data?

This question is a continuation of Calculate water frequency in Google Earth Engine based on time series? The previous question used a set of criteria (the numerical relationship like "larger than", "...
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143 views

Issue with Exporting Time-Series of Mean Region Statistics in Google Earth Engine

I am trying to export a time-series of multiple polygons' region stats from Google Earth Engine to CSV using the mean region reducer but am having issues with certain polygon IDs being dropped from ...
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1answer
130 views

Calculate water frequency in Google Earth Engine based on time series?

I have the Landsat 8 images cover southern Florida during 2017 (from Jan 1st to Dec 31st), with the cloud, scan edges and other bad observation pixels eliminated. I have also calculated several ...
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1answer
77 views

Converting Kelvin to Fahrenheit in raster stack using R?

I have a raster stack with 372 layers with Kelvin temperature. I want to convert Kelvin to Fahrenheit. I know the function, but do not know how to adjust the code so it can be applied to all layer in ...
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1answer
172 views

Pixel-based NDVI time series - Google Earth Engine

I am a newcomer using GEE and now I want to do a NDVI time series. The condition is that it must be based on the result of the pixel, and it need to displayed on the map. I just made the NDVI time ...
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0answers
26 views

Model binary rasters over time against non-spatial variable (e.g., inundation over time vs. gage height)

I have a time series of raster images for a study area that have been processed to a binary classification (inundated/not inundated). Each image in the series is time-stamped and can be associated ...
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1answer
57 views

Generating new ID for column if ROW - PREVIOUS_ROW >= 45 seconds? [closed]

I don't want this code to be distributed
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0answers
26 views

Extracting sequence of features from an image collection

I want to run a classification application but feed it with time series data of Landsat imagery. I have a set of points (each point has an attribute of 'class') and an image collection LandsatCol. For ...
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20 views

Day of the year values of pixels

I am trying to implement TWDTW model in R with dtwSat package. (You can find all the data here: https://www.jstatsoft.org/article/view/v088i05) In page 12, the paper gives a method to produce a land ...
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0answers
64 views

Smoothing MODIS LAI? [closed]

I am trying to smooth 8 days LAI data from MODIS and managed to work around it with several algorithms such as loess, Savitzky–Golay, smooth.spline etc. This is pretty much going well if the level of ...
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0answers
19 views

VCT Algorithm Using Landsat time series

I want to apply the Vegetation Change Tracker (vct) algorithm using Landsat time series. I have removed the water bodies out of the images, I have computed the FZ and IFZ values so that every image ...
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1answer
180 views

Using BFAST Spatial algorithm in R?

I have 65 monthly MOD11A2 (LST) images. The images came from the average of the original 8 day products. I have made them a time series stack using the timeStackMODIS function of the bfastSpatial ...
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2answers
193 views

Creating time series (NDVI) for each polygon contained in feature collection in Google Earth Engine?

I have an image collection of Landsat 5 and a feature collection of thousands polygons and points (in the example, I only have three). I would like to compute the NDVI (and NDWI) mean for each polygon ...
3
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1answer
330 views

Leaflet Time Series

I am trying to create a code using leaflet and am having trouble animating a series of weather radar images using WMS. My code is as follows: <!DOCTYPE html> <html> <head> <...
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1answer
51 views

NDVI time series chart showing multiple values for the same point in Google Earth Engine

I tried to generate a time series chart of NDVI using Sentinel-2 data for multiple points. But the chart has vertical plots with two values for same point and same date. Here is the code: var ...
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1answer
129 views

Getting 16 days composite in Google Earth Engine? [closed]

I've wrote this code. In this code I've call lst daily product. But I don't know how can I compute 16 days mean composite from daily product? code link: https://code.earthengine.google.com/...
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0answers
33 views

Filter specific month in image collection, Google Earth Engine? [duplicate]

I've wrote this below code. but I don't know, how can I call Landsat images for October (specific month) from 2014 to 2019? code link: https://code.earthengine.google.com/...
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1answer
78 views

Convert Landcover Raster to Vector to Use for Tracking NDVI Over Time

I want to look at NDVI and other spectral indices over time and compare these time series across different land cover types. I believe I have the code to do this but I'm running into the error that I ...
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0answers
55 views

Mean function from rts package, returns empty dataset, R

I am using the rts package in R and specifically the mean function, over a a gridded climatic dataset with many NA values. When I use apply.yearly(my_rts_object,mean) all I get is an empty raster ...
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1answer
255 views

Show time series data with non-contiguous times using Leaflet TimeDimension plugin

My data is made up of squares forming a grid where the value of each square changes with time. The times are equally spaced with 1 hour intervals, however, the data is only available for a certain ...