Questions tagged [sentinel-1]

Remote sensing satellites with a C-band synthetic aperture radar sensor.

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Product type selection on Sentinel-1 image, Single lookup Complex (SLC), or Ground Range Detected (GRD)?

I wanted to shift from sentinel-2 image to sentinel-1 for crop type mapping due to cloud coverage in the context of Nepal. So I started learning about the sentinel-1 image with references and ...
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Merging multiple image collections into one in Earth Engine without losing image properties

I have 4 different image collections and I am trying to merge them into a single collection. Further I want to mosaic them based on the date of acquisition. I tried this code, var Res_collection = ...
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Unable to visualize the complete overlap of shapefile with the image in GEE

My issue is somewhat similar to the issue described here. Except that I am using a shape file. I have a shapefile of Telangana State (a state in India). The shapefile can be downloaded from here "...
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Diffraction figure in Sentinel 1

I observed what I inteprete as a diffraction figure in Sentinel 1 data, and I have no idea what this is. You can se it if you go to 50.27252991423117, 38.04210455975978, the date of 2022-01-06, and ...
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Artefacts in Sentinel 1 Imagery

When loading Sentinel-1 imagery using the GEE template script and zooming to the Arabian Peninsular some areas appear distorted with higher values for VV and VH bands independent of the time frame ...
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Strips on Sentinel-1 EW image

I noticed some strips in a Sentinel-1 EW image acquired on 2015-03-30 over Lake Superior. This strips are visible only in HV band and are in the near range. What are they and how can I get rid of them?...
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Using Sentinel-1 L1 Azimuth Time

In the metadata included in S1 L1 products, in each geolocationGridPoint it is included the "azimuthTime" for each point. How can the azimuthTime be different for each pixel? Shouldn't the ...
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141 views

Convert Sentinel-1 images data from dB to linear

I would like to use speckle lee refined filter on Sentinel-1 collection. But in every document I found, it says that the input should be linear not in dB. Normally S-1 data in GEE is in dB. How do I ...
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Chlorophyll and particulate matter in the river

In the routine below for Google Earth Engine I can get the indexes of SAVI, NDVI etc. How can assemble code to obtain chlorophyll and particulate matter in suspension in river using images from ...
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Wring mathematical formula for Sentinel-1 in Google Earth Engine

I am trying to find permittivity using Sentinel-1 using following expression It is inverse of Modified Dubois model for soil moisture. I am new to GEE so I tried to break the expression in to small ...
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Apply multiple functions over image in GEE?

I am working on Sentinel-1 images. I have created a mosaic and want to apply functions related to band mathematics on it. //Define the time interval var start_date = ee.Date('2021-11-15'); var ...
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Sentinel 1 creating ratio from polarizations

I am trying to perform a simple raster operation (In python) on two different bands (polarization VV and polarization VH) of the same SAR GRD product so that I have a co/cross-polarized ratio: VV/VH ...
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Different plot for individual in Google Earth Engine without writing plot lines multiple times

For example, I have three polygons over the NDVI layer so I want three different charts, and if 100 then 100. I don't want one chart with different lines. I want to avoid writing the same plot chart ...
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1 answer
106 views

How to create a histogram of areas of clustered S1 image in Google Earth Engine?

I am using S1 images and clustering in Google Earth engine to identify different land uses. I clustered using ee.Clusterer.wekaKMeans(5).train. Now I want to create a histogram that shows the area per ...
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Changes in Sentinel 1 pre-processing in January 2020. ESA or GEE changed something

Working with Sentinel-1 I noticed different behaviors. Then, to analyze them, I took time-series (mean and standard deviation values) of some land and ocean polygons: The images were downloaded from ...
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164 views

Extracting tabularized metadata information from an ImageCollection in Google Earth Engine

Sometimes, one wants to know how many (and which) satellite images (e.g. Sentinel-1, Sentinel-2, or Landsat-X) are available for a given ROI in a given time frame. In Google Earth Engine, this ...
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Water spread using SAR images (Sentinel-1) in Google earth Engine. Converting into Vector

I am running a water spread mask of Karnataka, India using SAR imagery (sentinel-1). I want the water classified pixels to be in vector (shapefile) to export them to google drive.. As I am new to ...
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2 votes
1 answer
79 views

Calculating dates of unique images for a certain area in imageCollection using Google Earth Engine

I am trying to retrieve an image from the Sentinel-1 image collection where the user provides a time of interest and a region of interest. Since Sentinel-1 provides new images for a region only every ...
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220 views

Alternative to Snappy from ESA to work in QGIS

Is there a Alternative Python Package (https://senbox.atlassian.net/wiki/spaces/SNAP/pages/19300362/How+to+use+the+SNAP+API+from+Python), which allows the User to geocode Sentinel-1 Data? Snappy doesn'...
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SLC IW Visualization in Python/Matplotlib

I'm hoping to add Sentinel 1 data to a tool I'm building. Preferably I would like to use GDAL to load the image, and extract the pixel values from the image. I realize that the pixel values are ...
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37 views

Uncertainty associated with Sentinel-1 data in Google Earth Engine

I have a maybe naive question. I need to know what is the uncertainty associated with Sentinel 1 dataset in Google Earth Engine. Do you know where I can find this information? Or should I compare the ...
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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 ...
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1 answer
553 views

Creating composite RGB images from Sentinel 1 channels

I would like to create a RGB image using Sentinel 1 data. It appears the standard way is to assign VV, VH, and VV/VH for the R, G, and B channels. I do, however, have a two questions. One. It is ...
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SNAP: Regrid Sentinel-1 GRD to lon-lat?

Is there a simple way to get sentinel-1 GRD data on a longitude-latitude-grid using SNAP? I guess I could create a lon-lat-grid first and use the collocate function, but is there a better way?
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Using rasterio and matplotlib to visualize Sentinel-1 data

I'm trying to work with satellite data for the first time and running into problems. I find the documentation about using Sentinel-1 data in Python lacking, but maybe I'm searching for the wrong ...
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2 votes
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66 views

How to remove black stripes from image?

I'm trying to figure out how to get rid of these black lines in my images by creating a mask using the VV pixels. How can I get rid of these lines? // Load Sentinel-1 C-band SAR Ground Range ...
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Sentinel 1 imagery in GEE

Do the Sentinel 1 Ground Range Detected imagery available in GEE as ee.ImageCollection("COPERNICUS/S1_GRD") require no correction at all and are ready to use? The 5 pre processing steps ...
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157 views

How to fetch multiple images using Sentinel-Hub's EO Browser Custom script?

I'd like to use the floods Sentinel-hub Playground custom script in EO Browser so that I may download the result as geoTiff. https://github.com/sentinel-hub/custom-scripts/tree/master/sentinel-1/...
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1 answer
386 views

Delete tasks in Google Earth Engine using CLI?

I am trying to clear/delete my google earth engine tasks window with several commands but they do not work: `earthengine task cancel all` `earthengine task cancel TASK_ID` `tasks.clear()` tasks.clear(...
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1 answer
370 views

Plotting high latitude bounding box using cartopy

I have used the sentinelhub python api to download a Sentinel-1 scene corresponding to the north coast of greenland where a bounding box defined by lon-lat is highly distorted. I have tried a few ...
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1 vote
1 answer
210 views

Sentinel-1 radar data all zeros with Python SentinelHub API

I am requesting Sentinel-1 SAR data but rather than throwing an error the code is just returning zeros. My request: bbox = BBox([-145.8, 60.96, -146.5, 61.38], crs=CRS.WGS84) bbox_size = ...
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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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129 views

Display and label a stack of Sentinel 1 images with the date [closed]

I have a stack of Sentinel 1 images and I want to display all of them one by one and want the label to be the date of corresponding image. I am trying a for loop for that but I am unable to visualize ...
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Using SNAP in an automated pipeline

I found a way to extract data from Copernicus SciHub, but I'd love to find a way to automate to pre-processing in a Python script for both S2 and S1 data without having to use SNAP Desktop. Is there ...
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1 vote
1 answer
376 views

Is Sentinel-1 GRD product Sigma0 or Gamma0 in Google Earth Engine? [closed]

I am using Sentinel-1 SAR GRD imagery with IW and EW swaths from ESA through Google Earth Engine. Is the pre-processed Sentinel-1 GRD product that I access through GEE is Sigma0 or Gamma0 or Beta0? ...
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How to download sentinel 1 for a particular polygon from Google Earth Engine

I want to download Sentinel-1 SAR data for both VV and VH with IW only within a rectangular polygon? I could download with the ROI, but even though ROI is a rectangle, the output to export is a ...
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1 answer
184 views

Request Sentinel1 data with sentinelhub API doesn't work

I'm trying to acess Sentinel1 images using sentinelhub API with Jupyter lab notebook. I'm getting error messages and I don't understand why I get them. This is how I try to acess umages with IW (as ...
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Visualizing all Sentinel-1 Images in collection using Google Earth Engine

Here is the code. There are 81 sentinel images but I am only seeing the first one (or the last one maybe), how can I visualize other images. Let's say I want to see the 2nd one ? // Importing S-1 ...
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842 views

Pre-Processing of Sentinel-1 data using Python snappy API

While applying 'Apply-Orbit-File' to Sentinel-1 data during preprocessing via python snappy, the following error produced. Traceback (most recent call last): File "<pyshell#0>", ...
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1 vote
1 answer
392 views

Return empty dataframe when reading KML file of 'Sentinel 1 Acquisition Segments' using GeoPandas

I have downloaded the KML file of 'Sentinel 1 Acquisition Segments' from this url. I have written this code to read KML file into GeoDataFrame, but the code returns empty GeoDataFrame. >>>...
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2 votes
1 answer
350 views

Problem with Sentinel 1 images in Google Earth Engine

I am trying to apply Otsu algorthm to S1 images starting from its launch to till date on my study area for waterbody mapping. I perform otsu without applying any date filter for Satellite pass so I ...
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2 votes
1 answer
29 views

Scene boundary issue when reducing sentinel 1 in natural values vs dB

I have written a function that smooths sentinel 1 images by reducing across clusters created from a sentinel 2 median image, and then reduces the sentinel 1 collection to the p5 value. When I run the ...
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1 vote
1 answer
478 views

Google Earth Engine ROI area falling outside/partial coverage by Sentinel 1 Tile

Using this code I am trying to extract surface area of water bodies but some ROIs are not completely covered because of missing adjacent tile (see image). What can I do to add and mosaic the adjacent ...
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1 vote
1 answer
63 views

Sentinel-1 image backward

I have this problem with my images of the Ross Ice Shelf: This is an image that has been Radar - Radiometric- Calibrate- Amplitude_HH - Gamma0 followed by Speckle Filter. This is what happens when I ...
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2 votes
0 answers
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Error: Unrecognized argument type to convert to an Image

I am working with Sentinel-1 SAR data. I want to display each image (8 of them) separately onto the map. Here is the basic filtering; s1 is image collection var assamVV= s1 .filterBounds(roi) ....
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-1 votes
1 answer
154 views

Obtaining Sentinel 1 imagery from Google Earth Engine

I am trying to obtain Sentinel 1 imagery from Google Earth Engine using a script (link to script: https://code.earthengine.google.com/a3d11cd9919f33e8649e9b35e3f5c05e). This worked perfectly for 2017 ...
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3 votes
1 answer
682 views

GEE – Smoothing curve of detected water area

I am trying to plot the time series chart of the detected water area by otsu's method in Sentinel-1 images as a smoothed average curve. I found two approaches to this for the Google Earth Engine: ...
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0 votes
1 answer
427 views

Exporting image in Google Earth Engine - "Invalid type" error

I'm working with Sentinel-1 data in GEE and exporting the filtered VH and VV polarization channels images in the end. But this always gives me an error Error: Image.clipToBoundsAndScale, argument '...
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2 answers
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Sentinel-1 GRD: which intensity to use (VV, VH, or combination of these)?

I have Sentinel-1 IW GRD images; for each capture date, one geotif with the VV and one with the VH values. I assume these are intensity values for the co-polarization and cross-polarization bands. To ...
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0 votes
1 answer
131 views

Downloading Sentinel-1 SLC in individual bursts

I'm about to embark on a DInSAR time series project, for which I will be using Sentinel-1 single look complex (SLC) data. Sentinel-1 SLC products are only available in Interferometric Wide-swath (IW) ...
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