Questions tagged [time-series]
The time-series tag has no usage guidance.
1
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1answer
23 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 ...
0
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0answers
15 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)
...
0
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0answers
22 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 (...
2
votes
2answers
60 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 ...
1
vote
1answer
55 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 : ...
0
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2answers
47 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 ...
0
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1answer
44 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 ...
1
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0answers
28 views
Creating decision rules on pixel level in time series layer in R? [closed]
I am using Landsat 5, 7, 8 images and RStudio. My goal is to compute the disturbance in a given area using the Vegetation Change Tracker (VCT) algorithm. I would like to ask you if you could provide ...
0
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0answers
33 views
Empty output rasters when running the bfmSpatial function in R
I have 131 monthly MOD11A2 (LST) images and I want to make a time series analysis using the BFAST Monitor. The images came from the average of the original 8day products. I have made them a time ...
0
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1answer
27 views
Multidimensional File to allow for pixel values across time series
I have a composite of SAR (28 images in a time series) data and I am trying to get the values of each pixel for the whole time series. I am looking at the coefficient of variation and trying to ...
0
votes
1answer
45 views
Google Earth Engine, Image Collection Statistics?
I've wrot below code for time series processing via modis LST product, but it shows this error:
ImageCollection (Error)
Error in map(ID=2018_06_02):
Image.constant: Parameter 'value' is required.
...
0
votes
1answer
32 views
How to interpret the red trend map of time series on Google Earth Engine?
I'm starting to play with Google Earth Engine. Following https://docs.google.com/document/d/1mNIRB90jwLuASO1JYas1kuOXCLbOoy1Z4NlV1qIXM10/edit# I managet to put together this https://code.earthengine....
0
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1answer
31 views
Correlating Point Samples and MODIS SST in Google Earth Engine
I've got a dataset of ~60 points that we've taken during a series of oceanographic cruises where we were sampling, among other things, sea surface temperature. I'm interested in comparing these point ...
0
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0answers
32 views
R circular statistics on a raster time series
I have a raster time-series with values from 1 to 36 representing 10 days (dekads) timesteps and NA values.
I need to calculate the average and the standard deviation, taking into account that ...
0
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0answers
20 views
Extraction Burned Area from MCD64A1 for Region
I would like to extract burned area and burn date information from MCD64A1 MODIS Collection 6 global burned area product. The data is in monthly composites with burn dates in julian days. I need it ...
0
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1answer
38 views
What is the meaning of ' QC_val=0x…' in the bfastSpatial package?
I am using the bfastSpatial package in R. One of the parameters that I have to set is the QC_val=0x 'a number'.
I do not understand what number I have to insert.
I am using MOD11A2 product (MODIS LST ...
0
votes
1answer
59 views
Multi-Trend in Google Earth Engine?
I've wrote below code for visualize precipitation changes over a year with ui.chart command in two different provinces.
var persiann = ee.ImageCollection('NOAA/PERSIANN-CDR')
.filterDate('2017-01-01',...
0
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0answers
33 views
Masking clouds on Landsat8 vs Sentinel2
https://code.earthengine.google.com/dff0d955447b5f0e94998ed2fcd0cf29
Thinking about an adaptation of Landsat time series example to Sentinel 2 instead, I'll say that code has three parts which appear ...
1
vote
2answers
44 views
Do I need to do Radiometric Normalization for time series analysis, if I'm using L2_Landsat8_SR data?
I'm doing some forest change detection across several years using L2_Landsat8 Surface Reflectance data. And I am implementing the method available in R (landsat::relnorm) for relative radiometric ...
0
votes
1answer
82 views
Formatting h-axis of time series chart in Google Earth Engine
I am trying to make a time series NDVI based on mm-yy. Since I get monthly images to a single image (in map_m function), I lose 'system:time_start' from properties. So, I use the loop's time to set a ...
0
votes
1answer
69 views
Wrong with adding time series in the same chart in Google Earth Engine
Recently I've been trying to print time series for different regions and show them in the same plot. Everything goes fine if I exclude the 4th region into the time series (1-3 time series are fine). ...
0
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2answers
48 views
Relative Radiometric Normalization of multisensor Landsat Level 2 images using R
For my time series analysis, i need to use images of the three Landsat sensors (TM, ETM+ and OLI). I chose the already atmospheric corrected surface reflectance/Level-2 products. Due to the ...
1
vote
1answer
106 views
Filter Landsat Images - cloud cover
I'm trying to filter Landsat images based on the percent of cloud cover for my ROI. I have tried to adapt code in link one and link two but cannot get what I want. My ROI has been imported as a ...
1
vote
1answer
208 views
Create time series for multi-polygon Google Earth Engine
I have a imported a KML as fusion table to GEE. This fusion table is type of FeatureCollection and contains 6 elements. I would like to create a time series of a raster (in this example MODIS LST), ...
1
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0answers
32 views
Pre-Processing for multi-sensor Time series analyses based on Landsat Level 2 imagery
I downloaded TM, ETM+ and OLI Surface Reflectance Higher-Level Data Products (atmospheric corrected) based on L1TP Landsat images (radiometrically calibrated, orthorectified). I need to include images ...
1
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0answers
27 views
Error in smoothing NDVI (BISE) using SPIRITS
I want to minimize the spikes caused by cloud cover (smooth) NDVI timeseries data before applying Savitzky–Golay filter in Timesat. My previous post was also related to timeseries (Interpreting NDVI ...
0
votes
1answer
264 views
Create time series and export it to csv GEE
I'm new to GEE and I'm trying to create time series of MODIS LST for a selected point. I first chose a point on the map and my script is:
var POI = geometry;
// Get temperature data for 1 year.
var ...
1
vote
0answers
75 views
Display and aggregate time series based on map selection
My data is geospatial and consists in records of concentrations that are measured every day on fixed locations. I would like to display the time series of these records when I select one point of the ...
0
votes
1answer
495 views
Export data from time-series image collection to a table in Google Earth Engine
On Google Earth Engine, I'd like to accomplish two tasks:
extract data from every pixel, across a time-series, within the given geometry bounds and save it as a table.
I need a column which prints ...
3
votes
1answer
52 views
What's is the difference between slicing and stacking in a time-series analysis?
My adviser told me that there are two categories of time-series in remote sensing: slicing and stacking.
What is the difference between time-series stacking and slicing pertaining to landcover ...
0
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0answers
82 views
Interpreting NDVI curve in Timesat?
I am using 3 years of Modis(MOD13Q1) NDVI data in Timesat, I have selected a small portion of the forest area (fig.2) using processing window in TSM_GUI. As you can see that NDVI graph (blue_line) is ...
1
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1answer
259 views
Analyze time series NDVI using bfast
I would like to study a trend of NDVI data for a specific time interval using bfast package.
For this final aim, I read about the necessity to convert my data frame into a time series object in R. ...
0
votes
1answer
99 views
Extracting pixels in multiple rasters based on the values of another raster's pixels for time series analysis
I'm working with 52 rasters of a specific region over a period of one year in python. I also have a mask raster of the same area that is a binary color (250 black pixels for disparate areas of ...
1
vote
1answer
137 views
Creating a Loop in R for averaging Raster values to create time series
I have calculated several different indices for lakes stored as GEOTiff. I now want to write a loop with R to average the values for each lake, so only one value is left for each lake. And then create ...
2
votes
1answer
379 views
Google earth engine:SST by month per year
I'm trying to plot a chart and get data from Google Earth Engine. I'm using MODIS-Aqua/L3SMI data in Earth Engine.
I have used Earth Engines in built functions to compare average sea surface ...
0
votes
1answer
111 views
Performing linear trend analysis within shapefile using ArcGIS Desktop?
I have a shapefile (or several shapefiles, one per year, that I was going to join together to get all of the data in one attribute table) with an attribute for surface water area for each year. So ...
0
votes
1answer
65 views
g.getOutputs is not a function while Creating a Chart from a Series
I created a Time Series of NDVI from Sentinel 2 Data, now I want to Chart it, using the following code. I get the error g.getOutputs is not a function
I never used g.getOutputs, and from what I read, ...
1
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0answers
103 views
How can I fill NA values in my NDVI Data? [closed]
I have been trying for weeks now to clean my NDVI data. I know that I have to apply Savitzky-Golay filter to smoothen my data. But before that, I have to fill the missing values in my data. I am ...
0
votes
1answer
228 views
How should I fill gaps in an NDVI time series?
I'm something of a beginner to remote sensing so please forgive me if this is a silly question.
I've got an NDVI time series, from 2002-2016. I've smoothed the data using an excel spreadsheet with ...
3
votes
0answers
138 views
Geoserver ImageMosaic ignores existing datastore.properties (connect to PostGIS) and automatically generates index using shapefile
I am new to Geoserver. I am trying to publish a WMS service for a raster time series using the ImageMosaic plugin in Geoserver. I am using the sample dataset and instructions at this link
I want to ...
1
vote
0answers
181 views
Add a list of dates as an image properties in Google Earth Engine? [closed]
I've merged two image collections after calculating median values by month in each collection from 2000 to 2018. However I need to carry out an operation that needs the "sytem:time.start" field that ...
0
votes
1answer
300 views
Using ui.chart.image.series reducer with higher max pixel limit in Google Earth Engine?
Is it possible to use the ui.Chart.image.series function with an image collection, region, reducer, scale, AND a max pixel limit?
I'm dealing with 10m Sentinel-1 data, and even moderately sized ...
3
votes
1answer
362 views
NDVI-time series with missing values
I have a Landsat-NDVI-time series from 2013 - 2017 with 23 observations per year (115 scenes in total). My goal is to get a smooth time series for a selected single pixel (maybe by using a Savitzky-...
1
vote
1answer
518 views
Using spei() function on time series from rasterstack in R?
I want to use the spei() function in the SPEI package on a raster stack of monthly time series of water balance data. The stack has 30 years of monthly data, so 360 layers. The documentation for spei()...
4
votes
1answer
829 views
Extracting index/position of maximum value in annual time series in Google Earth Engine?
I am trying to extract the integer index/position of the maximum value in an annual MODIS NDVI time series in Earth Engine but I am having a difficult time to figure out a plan to do this. It is quite ...
0
votes
2answers
904 views
Cloud mask for Landsat8 on Google Earth Engine
I'm creating a composite image, in order to create a timeseries. I've already created the composited image, but i am having difficulty masking the clouds of the composite image. I've followed the code ...
0
votes
1answer
566 views
Apply a cloud mask to a Landsat8 collection in Google Earth Engine - time series [duplicate]
I have tried to apply a cloud mask for a landsat 8 collection using code1, code2, and code3 but none will work.
code1 encounters the error of not working even after changing
var mask = img.select(['...
1
vote
1answer
414 views
Chlorophyll Timeseries in Google Earth Engine
I am trying to create a time series for chlorophyll using Google Earth Engine. However once I run my code, i get an error message saying "Collection.geometry: Unable to perform this geometry operation....
2
votes
1answer
294 views
Exporting time series of multiple polygons to .csv. format table
I wanted to export a time series of Rainfall (CHIRPS) on *.CSV format without using the ui.Chart.image.seriesByRegion command. I cannot build the chart because there is too much data (daily data from ...
0
votes
1answer
422 views
How to download monthly values for a time series? NCEP_RE/surface_temp in GEE
I want to download values of Air temperature from NCEP/NCAR Reanalysis Data, Surface Temperature in Google Earth Engine. I want the average temperature of every month from 1948 to present, but with my ...
