Questions tagged [time-series]

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13 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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17 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
30 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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21 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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22 views

Plotting time series in GEE

I need to plot a time-series data from a Sentinel 1 image containing four bands which corresponds to four dates for a single landcover classes(rice). I have a collection of points (4 points) ...
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1answer
21 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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28 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
41 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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39 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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31 views

Creating time series using GEE for too large polygon

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
23 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
25 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
38 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
35 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
48 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
68 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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39 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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67 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
87 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
46 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
89 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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24 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
56 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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19 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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18 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
43 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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12 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
95 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
103 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 ...
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1answer
164 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
38 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
81 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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25 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
68 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
47 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
130 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 ...
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2answers
76 views

Mapbox GL JS - Trouble Loading Data to Create Layer

I am new to Mapbox GL JS and working with starter code from "Create a Time Slider" below: https://docs.mapbox.com/mapbox-gl-js/example/timeline-animation/ To pull in the data, the code uses d3.json ...
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0answers
102 views

Extracting time series from image collection in Google Earth Engine?

I tried to perform a pixel based time series change detection algorithm in GEE for a defined region, so i intended to extract every pixel time series values into something like a table or matrix, and ...
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1answer
310 views

Load GeoJSON polygon time series with Leaflet Time Dimension plug-in?

I have a GeoJSON file with time series data, representing repeating polygons with varying data. I have managed to display the data for one time interval (a subset of the data representing one interval)...
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155 views

Data organization in Google Earth Engine image collection?

I defined an image collection contains all landsat SR images(LT5,LE7 and LC8) only including some specific bands each. Finally 685 images in path 120 and row 32, each contains 10 bands were selected. ...
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25 views

Statistic validation for spectral trajectories/trend from ground truth dataset

I'm doing an extraction of spectral trajectories for disturbed forest pixels using multitemporal (single scene for 20 years) Landsat Surface Reflectance products. Usually, forest disturbances are ...
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0answers
43 views

Calculating MODIS 8-day composite GPP product as yearly [closed]

I want to use MODIS GPP 8-day composite product for an annual time series analysis. How to calculate the annual GPP from the 8-day composite? Since the fractions represent the daily average rates of ...
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0answers
128 views

Editing and saving CSV file to use in plugin for QGIS?

For using in a plugin (PS Time Series Viewer), I want to edit a CSV file in the way plugin wants. Somehow I think there's a problem with the CSV file. I would like to tell you all my steps because I ...
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1answer
157 views

Getting weekly mean composite in Google Earth Engine?

I am currently working on a time-series in Google Earth Engine. Iam still quite inexperienced, especially when it comes to functions. I want to extract the mean values of Sentinel1-images for each ...
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0answers
19 views

Reclassification of a two-sided significance test result of a rasterstack

I have in my project to analyze a time series of NDVI data for significant changes. For this I did a pixelwise check: # Loading all necessary libraries library(sp) library(raster) library(rgdal) ...
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0answers
120 views

Growing Season Length in Google Earth Engine?

I am trying to estimate growing season length with the MCD12Q2 dataset (Land Cover Dynamics Yearly L3 Global 500 m), which includes dates for the start and end of the growing season (...
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2answers
140 views

Calculating number of days between first and last frost in Google Earth Engine?

I want to do two things. First, I want to map the number of nights that have temperatures below 0 in one year. This code seems to do this. Second, I want to calculate the number of days between ...
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1answer
251 views

Tile error Google Earth Engine “Some bands might require explicit casts”

I'm getting this error when trying to map the result after calculating the seasonal median NDVI images for a time series with 7 different landsat tiles in Google Earth Engine: Link to the code : ...
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3answers
541 views

Extracting pixel time series from Google Earth Engine

I have written a short program in Python to extract a time series for any given pixel for MODIS data stored in the Google Earth Engine. The code is working fine and returns a data frame containing the ...
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1answer
80 views

Sentinal NDVI Time series Chart and CLassification

I am working on NDVI time series analysis using Sentinal data and also classifying the data it will give some error and not working and how can i get the chart of three different features in ...