Geographic Information Systems

Questions tagged [time-series]

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Series of data points indexed in time order.

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0answers
35 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
20 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
25 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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24 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
30 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
34 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
26 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
58 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
29 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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46 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
27 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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29 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
50 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
90 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
44 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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14 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
23 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
35 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
200 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
98 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
24 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
30 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
53 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 ...
1
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1answer
99 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
94 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
46 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
22 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
56 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
59 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. ...
1
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1answer
124 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
43 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
54 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
55 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 ...
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1answer
112 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
35 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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1answer
100 views

Converting raster stack or brick to ts time series object to run in BFAST

# created rasters from .tif file (r1,r2,r3,r4,r5,r6,r7)‎ ‎# created raster stack‎ r_stack <- stack(r1,r2,r3,r4,r5,r6,r7)‎ class : RasterStack ‎ dimensions : 743, 1893, 1406499, 7 (nrow, ncol,...
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1answer
64 views

Accessing data from time series in GEE

I have a code for NDVI time series from an image collection. This code prints the time series in a table or a chart. Is there a way to access the values in the table of the time series in google earth ...
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0answers
202 views

How to extract multiple values from specific coordinates and dates from a NetCDF time-series in R?

I need to extract information of a series of oceanographical variables in netCDF format for specific coordinates, each coordinate in a specific date as well. I'm using R and this is an example of my ...
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0answers
21 views

Stepwise regression method in GEE

I would like to use the stepwise regression method to compute time series analysis in GEE, is there a way to implement this regression model in GEE.
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0answers
40 views

Create Time Series Chart of NDVI (based on Landsat 5) of a National Park in Germany with Google Earth Engine

So this is my code so far: My Questions: How do I name the title and x-axis and y-axis? It isn´t working with .setOptions({title: 'NDVI Bayrischer Wald Landsat 5 1984 - 2013'}) unfortunately. How do ...
2
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1answer
46 views

How can the maximum temperature (tmmx) band in the TerraClimate GEE dataset be interpreted?

This question was already asked here. But there was no correct answer. link I'm using the precipitation, maximum temperature (tmmx) and soil moisture in the TerraClimate dataset in GEE. I cannot find ...
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1answer
67 views

Derive the statistical values from the time series data

I am trying to derive 5 statistical values: 1) maximum; 2) minimum; 3) standard deviation; 4) medium; and 5) 1090 interval mean from the time series data. And I know there are existed functions in GEE ...
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1answer
56 views

Time series chart CHIRPS data in Earth Engine

I am trying to derive a time series chart of the CHIRPS daily data set (precipitation) at a specific location. However, I get the following error "Error generating chart: No properties to chart.&...
0
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1answer
54 views

ArcGIS JS API - time series with heatmap

I am trying to create a time series of covid data moving across the globe. For now, I'm trying to use a heatmap to do it. Using this COVID19_Time_Series_Combined (which pulls data from here), I ...
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0answers
26 views

Iterating over features in Google Earth Engine

I am using the Zonal Time Series plotter from the LandTrendr scripts to plot an NDVI time series for a geometry. I would like to modify the script to be able to loop through objects in a table, ...
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1answer
33 views

How can I remove incorrectly selected images from collection to eliminate gaps in Google Earth Engine time series chart?

I am working on creating a tool that computes a number of different vegetation indices from Landsat across the state of Montana in order to allow users to examine time series charts for user-specified ...
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0answers
129 views

GEE - Applying Savitzky-Golay filter after LS8 NDVI calculation for smoothing curve generating

I'm new in GEE platform, thereby trying to generate a smoothed LS8 NDVI time series by using the Savitzky-Golay filter. I'm following https://groups.google.com/d/msg/google-earth-engine-developers/...
2
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1answer
121 views

Problem generating NDVI chart in GEE

I'm new to GEE. I'm currently working on NDVI data analysis. So this is my code for MODIS NDVI. I already run the NDVI scale factor function and do the image collection, Divide by 10000, in images ...
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1answer
136 views

Time series chart of EVI (Landsat 8) for a single pixel in GEE

I'm trying to chart out EVI for a single pixel(roi) over time. Basically trying to do what this link does for NDVI and apply it to the EVI available from landsat 8 imagery, but have no clue how to do ...
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0answers
15 views

TIMESAT Quality Data

I am trying to analyse time-series images from MODIS (MOD13Q1) in TIMESAT to clear the noise and get an output. With EVI images I got also QA. I have to use it because there is often a cloud cover in ...

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