Geographic Information Systems

Questions tagged [time-series]

Ask Question

Series of data points indexed in time order.

250 questions
Newest
Active
Bountied
Unanswered
Filter by
Sorted by
Tagged with
2
votes
1answer
50 views

Basemap and shapefile CRS issues [duplicate]

I am trying to overlay a timeseries shapefile over a geographic basemap, but the coordinate systems are not the same. I have set the project CRS to EPSG:4326, hence making the basemap in lat/long. ...
0
votes
1answer
57 views

Calculating longterm mean NDVI anomaly

I want to calculate the longterm mean NDVI anomaly at a specific geometry point buffered to 1000m. I have calculated the longterm mean NDVI for the 20 year period. Because I want to calculate NDVI ...
0
votes
1answer
34 views

Remove single (un-mosaicked) tiles after mosaicking image collection by day

I want to create a time-series of Sentinel-2 images that cover my entire study area (instead of individual tiles, since the study area spans 2 tiles). I mosaicked the image collection by day using the ...
0
votes
1answer
23 views

Increasing decimal in table chart Google Earth Engine

I have code that generates NDVI times series chart. The values are with 3 decimal places. I want to increase the decimal places to 4 or 5. Is there a way of doing that? My code: // Load raster data (...
0
votes
0answers
13 views

Extract by mask-timeslider issue

I have an issue with the "extract by mask" tool. My Raster Layer is a layer with time content, so I can start an animation with the timeslider. If I extract it based on a country border ...
1
vote
1answer
31 views

How to use MOD11A1 bitmask to select "Good Data Quality" pixels for further LST time series generation in GEE

I'm trying to generate a daily LST time series over a region by selecting only the good quality pixels. The code I've written is attached below along with the dataset description. My aim is to select ...
0
votes
1answer
74 views

NDVI time series with Sentinel-2 in Google Earth Engine

I want to calculate the time series of the NDVI with Sentinel-2 of a specific area of Australia. I started from this code: Time series analysis of NDVI using Google Earth Engine Substituting Landsat ...
0
votes
0answers
14 views

I need to get GLDAS S.M data for a certain location but i get "User memory limit exceeded". any solution?

Here is the link to the code on GEE: https://code.earthengine.google.com/ade50fa01b049d4ccf86a4c7f3f6c2dc Map.addLayer(table ,{},'DAM_irri',true); //var geometry_one = geometry; var geometry_one = ...
0
votes
0answers
16 views

What to use instead of Fusion Tables table for Creating Sentinel-2 NDVI time series chart in Google Earth Engine

I am trying to compile this two codes: /Import GEE Feature Collection (Somaliland kml) var geometry = ee.FeatureCollection('ft:1bzF2pepsJHoGIXn-ojYYOkOBHWtfhqzS9QLuz_l3'); // Create image ...
0
votes
0answers
39 views

Using ArcGIS Pro to measure change in land use over time (dynamically evolving maps)

How can I use ArcGIS Pro to record change in land use over time? I am working with this landuse dataset for London. I would like to know what use any given polygon was being put to each year between ...
1
vote
1answer
30 views

How to Separate Image Collections in Google Earth Engine?

In the below code, ERA-5 snow data is called and plotted. Based on this, some of the images detected snow cover and some of them no. So I'm going to know that how can I separate snowy and non-snowy ...
0
votes
0answers
8 views

Raster sampling of time series: Creating one single value-table including all values from all record dates by one single batch process

I have a Sentinel time series of about 25 rasters with different record dates. Area of interest are several sections/sites of a river floodplain. The tiffs contain for each pixel the reflection values ...
-1
votes
1answer
27 views

Converting numbered day of year to Month on the X axis for NDVI time series analysis for a range of years [closed]

I am working on an NDVI time-series series analysis to detect incidence pests. Timeseries generated by landcover is okay as I am using ui.Chart.image.series function. The problem I have is with the ...
1
vote
1answer
45 views

How to set pixels to 'no-data' if more than two standard deviation from mean of multiband raster?

I have a multiband raster of the first day temperatures exceed 15 degrees Celsius from 2000 to 2020 for a given region. As these are inferred from satellite images, we have cloud noise etc., therefore ...
0
votes
0answers
40 views

LandTrendr module for Earth Engine (LT-GEE) returns unexpected negative values

I want to extract the spectral response for all pixels within an aoi using GEE and Landtrendr. I've followed the documentation for this using the recommended parameters with no issues. My problem ...
0
votes
1answer
73 views

Extracting raster point values in CSV along with coordinates in GEE

I am trying to extract timeseries Sentinel1 value to a CSV file. Using the code below I have generated graph and also exported to csv but the coordinates ares missing. Please check my code and suggest ...
1
vote
0answers
48 views

Computing NDVI pixel based timeseries for specific landcover classes in Google Earth Engine for a specific time period

I am trying to optimize my Google Earth Engine to perform a pixel-based NDVI time-series analysis for my four landcover classes (grassland, forest, crops and shrubs). I masked these landcover classes ...
0
votes
0answers
9 views

How can we resample the InSAR results into an identical grid?

In time series InSAR, the PS pixels from different tracks are usually located in different positions. How to resample them into the same grid so that 2D or 3D displacement can be calculated? There is ...
0
votes
1answer
30 views

Is there a land cover type image collection on Google Earth Engine that covers the period 2000-2020?

I am conducting an analysis that requires a land cover type time series for the period 2000-2020. The only land cover type time series that I could find covering this period is the one being produced ...
0
votes
1answer
82 views

Reducing multiple NDVI timeseries values for single date at pixel level

I am generating an NDVI Timeseries for masked land cover classes using the Copernicus landcover 2019 Global product in Google Earth Engine. I have masked the landcover classes but and I am computing ...
0
votes
1answer
46 views

Export time series mesh data to grid

I have a grib file containing temperature and precipitation, monthly, from 1989 to 2019 for a specific region (extracted from ERA5-Land). I imported it in QGIS as a mesh layer. I need to locate those ...
1
vote
1answer
32 views

Extract 3 hourly GLDAS data at particular point of time on daily time step from Google Earth Engine

The GLDAS data is at 3 hourly timesteps starting from 3, 6, 9, 12, 15, 18, 21, and 24 UTC. and I want to extract the time series of Downward short-wave radiation flux at 12 UTC only for each day as it ...
2
votes
1answer
82 views

Count # of consecutive days without rain before an active fire

I have modified code from Google Earth Engine - counts days of the longest dry period in a time period to look at the longest consecutive number of days without rain in an image collection. I am now ...
0
votes
1answer
22 views

MODIS - MOD11A1 Data not available <2018 using the MODIS package (R)?

I'm using the MODIS package to download MOD11A1 data, I'm looking for a timeseries from 2016 to 2020, which is well within the temporal range of the data. However, when I try downloading the data ...
1
vote
1answer
41 views

How to find first temporal occurrence of specific values for each pixel

I have a NetCDF file for a given region in North America. It contains temperature data from 1959 to 2009. I would like to extract the first day on which the temperature exceeds 273 K for each pixel. ...
0
votes
0answers
15 views

Earth Engine timelapse with missing images and artifacts

I am attempting to make a high quality timelapse using Earth Engine. I have been following this guide Time series on LANDSAT data gee the guide works perfectly as described but the area I want is at ...
1
vote
0answers
18 views

TROPOMI NO2 and SO2 too small ... being approximated to zero [duplicate]

I am trying to download TROPOMI NO2 and SO2 data for my region as a timeseries from Google Earth Engine, however, the values are small (see attached images) and as such, when I download the CSV file, ...
0
votes
0answers
57 views

Computation timed out when exporting time series for a large number of locations from Google Earth Engine

I am trying to export Sentinel-2 NDVI time series for a huge number of fields (n>80000) to a csv file. However I got a 'computation timed out' error after 12 hours of running. Here is the code and ...
0
votes
0answers
16 views

Adding granules to GeoServer store doesn't update time dimension of WMS?

I'm pretty new to using GeoServer, so I'm sorry if this question has been asked already and I just was unable to use the correct verbage to find it. I've been following this tutorial to add a raster ...
0
votes
3answers
35 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. ...
2
votes
1answer
28 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 ...
0
votes
0answers
46 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 ...
0
votes
0answers
29 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 ...
0
votes
1answer
51 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 ...
0
votes
0answers
29 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 ...
0
votes
0answers
67 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 ...
0
votes
0answers
49 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... ...
1
vote
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-...
0
votes
1answer
22 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 ...
1
vote
2answers
60 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 ...
1
vote
1answer
50 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 ...
2
votes
2answers
296 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 ...
1
vote
0answers
61 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 ...
0
votes
0answers
34 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 ...
1
vote
1answer
44 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: //------------------------...
0
votes
0answers
47 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 ...
0
votes
0answers
95 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 ...
0
votes
1answer
42 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/...
2
votes
0answers
36 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 ...
0
votes
0answers
127 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 ...

1
2 3 4 5

Your privacy

By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy.