Questions tagged [time-series]
The time-series tag has no usage guidance.
120
questions
0
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1answer
14 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 ...
1
vote
1answer
23 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 ...
0
votes
1answer
21 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: ...
0
votes
1answer
25 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-...
1
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2answers
36 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):
...
-1
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0answers
18 views
How to solve 'need finite 'ylim' values' in R while plotting a time series graph? [closed]
I am working with a large MODIS dataset and I am trying to plot the time series graph of it's NDVI values. I have created a raster brick of all the imageries and then converted the brick into a vector ...
2
votes
1answer
40 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 ...
1
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0answers
29 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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0answers
41 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 ...
-1
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0answers
12 views
Get monthly average of multiple bands
I have an image collection that contains the following bands from the period 2014 through 2018.
var imgCollection = imgCollection
.map(addNDVI)
.select(['B3', 'B4', 'B5', 'B6', 'B7', 'NDVI']);
...
1
vote
1answer
70 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 ...
-1
votes
1answer
42 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 ...
0
votes
1answer
61 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 ...
1
vote
0answers
23 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 ...
0
votes
1answer
55 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
15 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 ...
0
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0answers
16 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 ...
2
votes
0answers
34 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 ...
0
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0answers
10 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 ...
0
votes
1answer
57 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 ...
2
votes
2answers
68 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 ...
1
vote
1answer
89 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>
<...
0
votes
1answer
26 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 ...
0
votes
1answer
49 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
23 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/...
1
vote
1answer
55 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 ...
1
vote
0answers
41 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 ...
0
votes
1answer
90 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 ...
0
votes
2answers
55 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 ...
1
vote
0answers
87 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 ...
1
vote
1answer
231 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)...
0
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0answers
105 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.
...
0
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0answers
23 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 ...
1
vote
0answers
32 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 ...
0
votes
0answers
114 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 ...
1
vote
1answer
109 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
votes
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)
...
0
votes
0answers
90 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
117 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
181 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 : ...
2
votes
3answers
376 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
votes
1answer
62 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
vote
0answers
36 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
votes
1answer
33 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
114 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
38 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
votes
1answer
57 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
votes
0answers
44 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
39 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
votes
1answer
50 views
What is the meaning of ' QC_val=0x…' in the cleanMODIS of 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 ...
