Questions tagged [time-series]
The time-series tag has no usage guidance.
0
votes
1answer
22 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
26 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
votes
0answers
14 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
28 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
38 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
votes
0answers
24 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
29 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
27 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
35 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
votes
2answers
31 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
58 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
80 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
vote
0answers
19 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
vote
0answers
19 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 ...
-1
votes
0answers
21 views
How to Write VCI index in Google Earth Engine? [duplicate]
How can I write this equation (NDVI - NDVImin) / (NDVImax - NDVImin) for modis ndvi image collection, could everyone help me please? I don't know, how can I extract min and max for each NDVI in image ...
-1
votes
0answers
17 views
Creating timeseries from csv file using ArcGIS Online?
Is it possible to create a time slider/time-aware layer from a csv file in Web Maps? (I could swear I've found a page saying so but I've gone through so many tabs and pages I have no clue)
My data ...
0
votes
1answer
102 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
51 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
279 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 ...
0
votes
0answers
26 views
What's stacking in time-series in Remote Sense?
I am learning time-series of remote sense.
My adviser told me that there are two categories of time-series, slicing and stacking. I couldn't understand what's stacking is thought I know what stack is ...
0
votes
0answers
75 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
vote
1answer
219 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
70 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
123 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 ...
1
vote
1answer
190 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
84 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
40 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
vote
0answers
88 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
187 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
107 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
148 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
219 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
311 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
434 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
633 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
624 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
425 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
353 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
217 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
350 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 ...
1
vote
0answers
45 views
Missing Values in Crop identification using Python? [closed]
I am developing a Python based process that classify crops via time series analysis. Due to clouds there are many missing values. My problem is how to assign a value to these pixels that would be near ...
0
votes
0answers
238 views
Raster Time Series, express years in time series
What's the best option to express years in Raster Time Series object in R.
I define years as dates:
YEARSSEQ <-seq(as.Date("2008-01-01"), as.Date("2009-01-01"), "year")
and then I pass them in ...
1
vote
0answers
270 views
Creating time series from NetCDF with multiple values to multiple points on ArcGIS Desktop?
I am using ArcGIS Desktop to read and extract netcdf files which have data on longitudes, latitudes and daily temperature over several years. I have separate shapefile with postcodes and the goal is ...
0
votes
1answer
142 views
Topographic correction in ENVI
I work with LS8-data in a mountainous area where the illumination is poor especially in the winter months. My thought is to use either a shadow mask or apply topographic correction.
I will use all ...
0
votes
0answers
222 views
NDSI time series derived from Landsat 5 and Landsat 7
I'm using NDSI derived from Landsat 5 and 7 available on Google Earth Engine to estimate snow cover change over time at 6 different sites.
I know data from L5 was not good after 2005, but the ...
1
vote
1answer
80 views
Spatial join attributes in QGIS for a time series
I have metropolitan areas and I want to calculate average values (GDP, Population, etc) per year. I have another layer with NUTS areas with theses values, from 1970 to 2012.
So far, I know the ...
1
vote
1answer
233 views
Can't create time-series raster WMS with Geoserver due to time regex expression issue
I am attempting to create a raster time-series WMS server using GeoServer and have been working off this tutorial provided here:
http://docs.geoserver.org/stable/en/user/tutorials/...
1
vote
0answers
347 views
GIS data visualization
I have a huge data set with geolocation information. I am trying to visualize the data but the tools cannot handle such a big graph. Size of the file is about 5GB and has more than 3 million rows.
...
0
votes
1answer
296 views
Apply SPEI::hargreaves function to time series from each pixel rasterbrick R
library(SPEI)
library(raster)
Basically, given a monthly time series for two variables a and b as follows:
a = array(1:(3*4*12*64),c(3,4,12*64))
a = brick(a)
dates=seq(as.Date("1950-01-01"), as....
2
votes
1answer
249 views
Exporting an animation (Time Series) map through QGIS2web plugin
I simply would like to know if it is possible to export an animation map using the QGIS2web plugin so I may display a time series map on the web through the plugin?
