Questions tagged [time-series]

Series of data points indexed in time order.

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3answers
27 views

GRASS - Calculate 90th percentile of a timeseries dataset

How can I calculate the 90th percentile from a registered timeseries dataset of 30 rasters in GRASS? GRASS timeseries has 2 "statistical" commands which are t.info and t.rast.univar. ...
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1answer
27 views

Grab/Index the raster bands before and after a unique band for each pixel (depth-wise) in a raster stack

I'm working with a time series stack of 28 raster bands. Each band is an image for a specific date, spanning all of the year 2020, and they are stacked in order. The stack (change_point_raster) is in ...
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0answers
19 views

Harmonic modeling of multiple bands in Earth Engine

I am trying to generate harmonic models for multiple spectral indices derived from the same image collection time-series in Google Earth Engine (say EVI and NDVI). The implementations I have been able ...
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0answers
25 views

How to get 3D GPS positions from geographic latitude, longitude and altitude?

I have a list of GPS measurements for a point for a period of about 2 years. They are latitude, longitude and altitude. I want to generate the time series for the east, north and up components. Do I ...
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0answers
17 views

Getting time series of several spectral indices for each feature in a feature collection [closed]

I am trying to get Landsat (5, 7, and 8) time series of different spectral indices for each feature of a feature collection with a total number of 72 polygons. To do that, I have created an image ...
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1answer
39 views

Slow response of Open Data Cube for large amount of polygons

I have indexed 5 Sentinel-2 images and I am requesting the data (10 bands and the 5 images) for each one of 180,000 polygons included in a shapefile. Each request needs 8 seconds for the related data ...
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0answers
26 views

Installing plugin for Time Manage Error Manage

I've tried installing different versions and have now reinstalled both Python and QGIS to see if that made a difference however, I still can't resolve the problem. This is the error message I still ...
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0answers
33 views

Google Earth Engine- Creating a Landsat NDVI time series across multiple satellites?

I have this code, which I use to plot an NDVI time series for a geometry with Landsat 8. However, I would like to create a time series from 1985-2019, which requires Landsat 5 and 7. How can I ...
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0answers
31 views

Google Earth Engine Sum Area of Image and time series

I'm calculating NDSI from landsat-8 image and I want to show the snowy area through a chart. I'm able to calculate the area for each pixel based on NDSI but I don't know how to sum the pixel values... ...
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0answers
19 views

Time Series of mean using Google Earth Engine

I've written a function that extracts the NDVI time series for a point geometry, but I would like instead for the time-series to follow the mean of a region over time. How would I do that? var ...
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0answers
20 views

ArcGIS Pro time slider display

I have time-enabled data in ArcGIS Pro. The time field is strictly YYYY-MM-DD, but the time slider shows YYYY-MM-DD HH:MM:SS. Is there a way to configure the time slider display to strictly show YYYY-...
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1answer
19 views

Carto time-series widget: how to change bucket labels?

I am using the Carto builder animated time-series widget based on a number column that contains a year as a four digit integer. In the widget's horizontal axis, the buckets are not labeled with ...
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2answers
46 views

Google Earth Engine memory capacity exceeded

I am trying to export to a csv table with total precipitation per month-year per polygon (~5571 polygons) from 2001-2019 (228 time steps). I am using the CHIRPS dataset (daily data) so had to reduce ...
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1answer
43 views

Output of a value at a given date and location in Google Earth Engine

I calculated the Albedo of a Greenland and would like to code it in a way that GEE gives out the value of the Albedo for a given date and location or to have an overview in a table. So far I was only ...
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1answer
94 views

Iterating over dates to extract precipitation in Google Earth Engine

I'm looking to sum precipitation for a period of 10-days prior to a specified date. This is just an example - in fact, I have around 60 different dates and I don't want to select each the date ...
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0answers
49 views

Export Error in Google Earth Engine?

The below code exports monthly data. However while it is saving in Google Drive, returns this error: Error: Expected a homogeneous image collection, but an image with incompatible bands was ...
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0answers
30 views

Sentinel 1 missing data

I´m trying to use the complete descending dataset (VV and VH) for a location in Colombia and must got the same number of scenes by band but it does not; in fact, there are 3 missing years of data for ...
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1answer
36 views

Downloading many charts as CSV files at once

My code generates 5-time series charts. Is there a way to download all of them at once to CSV files through the code and not through the arrow on the upper right? code: //------------------------...
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0answers
35 views

TimeSeries and Export to CSV Google Earth Explorer

I am fairly new to coding. I have the below code to generate monthly NDVI data for each of the 15 regions. I can do them all individually, but it does take some time. Are there any method of ...
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0answers
52 views

LandTrendr forest loss detection and area calculation

I have to calculate the area of the annual forest loss for a polygon with LandTrendr. Since individual pixels can have several forest loss events over a period of 35 years (e.g. 1995 and 2013), I am ...
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1answer
39 views

Export to drive only exports black and white images

I am generating a burn severity map for the assessment of the areas affected by wildfires in California and Australia.using this code: https://code.earthengine.google.com/...
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0answers
29 views

Temporal Manager raster animation monthly instead of days in QGIS

I have raster files on a per month scale over several years. I struggle to create an animation that shows monthly changes. I would like to have an animation showing each monthly raster file (and my ...
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0answers
72 views

Plotting time series in QGIS

I have a shapefile with points, like this: x, y, id, data -1.3345,-0.4760, 1, data.csv The data.csv contains: date, data 2020-01-01, 1 2020-01-02, 2 2020-01-03, 3 2020-01-04, 4 How can I plot the ...
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1answer
37 views

Metadata Error in Google Earth Engine?

In the below code time band doesn't create for merged collection. I don't know why but it returns metadata error: code link: https://code.earthengine.google.com/3827c156af430c2485aedf28f9273206 Map....
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0answers
60 views

Earth Engine: Combine time-series of NDVI from Landsat 5, 7 and 8, into one image collection and export CSV values

I'm working with 79 different research sites in Oregon where I need to extract the full time-series of NDVI values for specific areas around natural springs and then compare them to a corresponding ...
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1answer
39 views

Layer added to QGIS TimeManager disappears from the TimeManager panel

I am trying to use the TimeManager plugin in QGIS 3.16.1. I have successfully used this plugin in the past, but I'm running into some odd problems now that I can't figure out. I have a geopackage ...
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0answers
51 views

Why does my Google Earth Engine code run on a polygon, but not an image if they are of the same area

I have an Image (TIFF) that I imported and would like to run this script over to calculate average NDVI over that region, but it does not work giving me an error message stating "ImageCollection (...
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0answers
74 views

Obtaining time series of water extents per plot using landsat NDWI data available on GEE

I wanted to obtain a monthly time series estimate of the water surface for each of 67 survey plots (500m circles). However, I could not figure out how to correctly code this in the google earth engine....
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2answers
131 views

Printing max and min values of Landsat NDVI time series to GEE console

I am trying to extract the min and max values of an NDVI time series and print those values to the console, so I could then subtract those values to determine the seasonal stability of an area. Most ...
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1answer
53 views

Calculating frequency of polygon types overlapping coordinate point

I have shapefiles of sea ice coverage for multiple days of the year. At each time-point (day) the sea ice is split into different polygons which corresponds to different ice types (i.e. fast ice, ...
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0answers
18 views

Time series charts

After developing this code: var dataset = ee.ImageCollection("ECMWF/ERA5_LAND/HOURLY").select("temperature_2m"); // Change de user interface to put into pannels de differences ...
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0answers
26 views

Generating Table or chart of point values per polygon from time series - Google Earth Engine

I'm trying to generate a table with my GNDVI points value from a time series. I have a feature collection of my polygons, another feature collection of my random points in the polygons. I have a image ...
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0answers
44 views

Extracting raster NDVI images for summer months over several years (GEE and LANDSAT)

I want to extract NDVI raster image that is including only NDVI band over a certain region (noted as point) for summer months over several years. I am working with Landsat 8 and the time frame is June,...
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1answer
299 views

Invalid Number Error in Google Earth Engine?

I wrote the below code for sentinel5 data, but returns Invalid Number error in monthly loop. It used to work very well but now shows error. How can I fix it? code link: https://code.earthengine....
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2answers
160 views

Extract pixel values of dataset (NetCDF) based on shapefile in R

I want to extract certain pixel values from a raster stack/brick from one layer (there are two Layers stored in the data - RSS_TOP and RSS_SUB --> if possible I would take both, or separately as ...
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0answers
30 views

Merging multiple point shapefiles that have same coordinates but different years

I am using ArcGIS Pro. I have 35 shapefiles of point data, with each layer representing a different year of data collection. Each layer has points with the same coordinates. I want to bring these ...
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1answer
34 views

Extracting time series trend analysis parameters from kriging using ArcGIS (versus R)

A grad student has asked me a question about extracting trend parameters for a time series of data using ordinary kriging ArcGIS tools. I'm not an expert in the spatial statistics options of ArcGIS, ...
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1answer
58 views

Google earth engine: function to apply code to sequential dates

0 I have a code which creates a value for several different variables for a specific time period (usually over 1 month) and exports these as a csv to my google drive. You can find a link to the code ...
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1answer
178 views

SAVI time-series chart on Google Earth Engine

I've been trying to generate time-series indexes charts and print it on the panel, but the SAVI index chart ends up looking just the same as the NDVI chart, besides, the range is wrong (0 - 1.5). Here ...
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1answer
183 views

How to extract pixel values of a polygon shape, using R for annual (365 files per year), daily NetCDF raster files?

I am trying to extract a daily value from a study area (given polygon). The files are provided as annual NetCDF files (365 of them per year) for a daily value. However, with GIS programs it would be ...
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0answers
79 views

QGIS temporal animation with date values in different columns

I'd like to create a time series animation in QGIS 3.14. My data is structured in a way that the dates are given by the field names. I have field names like "country_name", "1/15/20&...
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0answers
39 views

Adding timestamp to NetCDF xarray dataset

I am new to working with NetCDF datasets and Xarray in Python. I have an xarray dataset made from 100 TIFF raster files: As you can see there are 100 data variables, that are essentially the ...
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2answers
61 views

Calculating consecutive number of dry days in year using Time Series in GRASS

I have a database with daily raster maps of future precipitation for some years (let's say 2020-2050, divided in 10 years subperiods), named like this: "pr_model_rcp_2020_2030.1", "...
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0answers
76 views

QGIS: prepare data for timeline animation

I have a data-spreadsheet containing a value-attribute that changes over time for a number of administrative units. I have a polygon layer as well with features for each of the administrative units. ...
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1answer
213 views

Implement system:time_start for NDVI trend analysis in GEE

I am developing a yearly NDVI trend analysis using Landsat data in Earth Engine over the last decades. My process is to add a NDVI band to every scene for each summer (green) month, then to reduce the ...
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1answer
55 views

Loop through time values in a raster brick in R

I have raster bricks of temperature and rainfall consisting of one layer for each month of the year. The raster brick looks like this: > tmx class : RasterBrick dimensions : 3875, 8017, ...
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1answer
86 views

Time Series Extraction of Modis LAI product (every 3 days a new satellite image) in small study area

At the moment I am struggling with a time series and the extraction of MODIS LAI data. I am using the band "Lai" from MODIS/006/MCD15A3H. My study area is small, so presumably, since the ...
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1answer
68 views

Extracting time series of one pixel from the SMAP soil moisture (soil moisture in %) product

Currently I am writing on my script to extract a time series of SMAP pixel values of the band 'smp', however, my studyarea is rather small and hence the script I found online in this community from ...
1
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1answer
148 views

Google Earth Engine timeseries chart

Using this Google Earth Engine code I am trying to create a line graph of the data for the specified date range. The result I got is not a continuous line graph and the exported value shows undefined:...
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1answer
38 views

Iterate through date columns in CARTO (frames, VL, etc.)

I currently have a data file that has columns for each day over an 8-month period. I am seeking of a way to create an interactive CARTO map that displays the change over time. I want to know if there ...

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