Questions tagged [sentinel-1]

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

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Google Earth Engine exported TIFF file cell size in ArcGIS

I set the scale of my image to 10 when exporting from GEE. When I open the raster in ArcGIS Pro I get a cell size of 8.983152841195213E-05 instead of 10. Is there any way to make it 10 x 10 cell size ...
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Combining Sentinel-1 and Sentinel-2 for classification in GEE

I have Sentinel-1 data with VV and VH bands at a 10-meter resolution, while my Sentinel-2 data consists of 10 bands with a mix of 10-meter and 20-meter resolutions. I intend to utilize both Sentinel-1 ...
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Winter spikes in SAR GRD magnitude in Middle East

I've been looking at SAR images (GRD) of the Middle East using Google Earth Engine. I notice that in the winter time there is often spikes in the VV and VH measurements. Looking at the images ...
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Calculating NDFI for every week of the year

I wish to calculate the Normalized Difference Flood Index of every week in a year for a region using Sentinel-1 imagery in GEE. The NDFI equation is, I am confused about how to set the reference ...
Raihan's user avatar
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Sentinel-1 SAR Level 1 Data

From where I can find the satellite Metadata ( satellite position vector, velocity) for the corresponding SAR Level 1 image? I have tried to look but didn't find the source to download these files.
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ImageCollection (Error) Error in map: Image.constant: Parameter 'value' is required

I need to use data from Sentinel-1 satellite to extract water bodies and obtain water area, but I encountered an error during terrain correction: ImageCollection (Error) Error in map: Image. constant: ...
Holly's user avatar
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Using Otsu's Method to separate water and not-water in GEE

I am trying to separate permanent waterbody and not-water from Sentinel-1 image in earth engine. To do this I am taking a median and mean image for a month from a range of years and then using Otsu's ...
Raihan's user avatar
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Layer Partly missing after zoom in the map and download from Google Earth Engine [closed]

I want to calculate DpRVIc (a kind of vegetation index) by using the Sentinel-1 data on Google Earth Engine. I successfully done my calculation and added the layer to the map on GEE website. However, ...
HsunHung Chu's user avatar
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In the official Sentinel 1 GRD product in SAFE format, where is the view/incidence angle?

As the title says, I am trying to figure out where in the metadata is the information on view angle stored. I can see it has information on min and max view angle, but I want a raster with the angle ...
Jose's user avatar
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How geolocalisate a new image with a polygon (JSON file)

I am new using QGIS. I got an Sentinel-1 image from Copernicus I downloaded it as TIFF. I did Python code to detect water so now l have a new plot. I would like this plot gets the same coordinate than ...
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Using rasterio to rasterize vector data to a GCP referenced image

I am working with Sentinel-1 SAR images of a coastal area in ground range geometry (GRD product), which is defined by a geolocation grid of 10×21 ground control points. For further analysis, I need to ...
Christoph's user avatar
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Strange black pixels scattered on terrain flattened image

I am attempting terrain flattening of the Sentinel-1 images here. However, I am encountering strange black pixels scattered throughout, as shown in the attached figure. I was calculating annual median ...
Yuqi's user avatar
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Practical difference between intensity and amplitude in SLC SAR Sentinel 1 data

In the SLC product, amplitude data is not explicitly provided by SLC Sentinel 1, only the real (i) and imaginary (q) bands of each polarization obtained, in addition to a band called “Intensity” for ...
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ArcGIS Pro - Layers Show in Contents but not on Map

I am new to ArcGIS Pro. I came across a short course from Esri learning about the processing of Sentinel data. They taught several techniques about how to mitigating speckle, removing radiometric and ...
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How to obtain coordinates of Sentinel-1 image

I’m a beginner in satellite image analysis. I want to know the lat/lon coordinates of some bursts of a sentinel-1 image. I looked at the file names of the downloaded zip, but couldn’t find any ...
Yuka Sashihara's user avatar
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Data column(s) for axis #0 cannot be of type string

I am trying to calculate NDVI using Sentinel 1, but when I tried to make a chart of it, this error is coming. Error, "Error generating chart: Data column(s) for axis #0 cannot be of type string&...
Muhammad Waqas's user avatar
1 vote
1 answer
183 views

Joining a Smoothed Landsat and Sentinel-1 Time Series & Exporting Yearly

I am working on a script that needs to do the following; 1. smooth a Landsat time series 2a. apply a filter to remove noise from sentinel-1 using refined Lee 2b. smooth a sentinel-1 time series 3. ...
pbalteza's user avatar
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1 answer
159 views

Calculating cumulative sum chart using Google Earth Engine Python API

I would like to calculate cumulative sum chart for time series of 4 images time series sentinel-1. The formular for this is : S0=0, S1=S0 + (x1-x), S2=S1+(x2-x), S3=S2+(x3-x), S4= S3+(x4-x) where xi= ...
user30985's user avatar
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2 votes
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How can I get the VH value from Sentinel-1 image?

I'd like to get the weekly VHmean value to compare the threshold value. I wrote the code with reference to other ones. For example: Google Earth Engine: cumulative iteration of weekly mean anomaly ...
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Download clipped Sentinel1-GRD data using bounding box or an AOI

I am using this code to download Sentinel-1 data. I am able to download a whole tile. I want to crop a specfic area and download that region using my AOI. This is my code of Jupyter notebook- pip ...
sensing's user avatar
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Random forest error on GEE

I have a problem with random forest classification, receiving an error message after inputting the training dataset. My code includes a long preprocessing for Sentinel1 and Sentinel2, but here I'll ...
Cinnamon roll's user avatar
1 vote
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Overlaying Sentinel-1 collection scenes on Google Earth platform

I'm new to GEE and I need to create some code to estimate Soil Surface Moisture (SSM) in Google Engine. However, when generating the image on the map, the product has an issue with overlapping scenes ...
Tony Almeida's user avatar
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How to estimate soil surface moisture using change detection algorithm (TU Wien Change Detection model) in Google Engine?

I would like to use ESA open science data from Sentinel 1 SAR images to estimate soil surface moisture using the change detection algorithm (TU Wien Change Detection model). I found this script on ...
Tony Almeida's user avatar
2 votes
1 answer
126 views

Handle errors in GEE Code editor

I am trying to export a CSV file containing numeric data for many locations but Sentinel-1 grd does not have VV and VH data at certain locations and it is throwing errors. How to handle them and ...
Sriram's user avatar
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154 views

Calling linear to converted dB bands and creating few more bands such as VV/VH, VH/VV, VV+VH in function using Google Earth Engine

My question is similar to: Radar Vegetation Index Using Google Earth Engine Convert Sentinel-1 images data from dB to linear I am new to GEE and JavaScript. I want to create the following number of ...
Mohana's user avatar
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1 vote
1 answer
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Discontinuity error in Sentinel-1 water map

I tried to generate the water occurrence map from Sentinel-1 to compare with the JRC global dataset. Here is my problem, after calculating the Occurrence of water through sum() and divided it for each ...
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Error in GEE Function for masking water from Sentinel-1

I am rewriting a code to apply the edge Otsu method for a collection of image in GEE. My code is divided into 2 part, first I determined an image using the Canny edge detection, after that I used the ...
nicholaskr23's user avatar
2 votes
1 answer
204 views

Using coordinates to access GeoTIFF dataset

I'm trying to read a tile from the Sentinel1 SAR data collection. I'm using rioxarray to open the .tiff data file. rioxarray.open_rasterio( path_to_data, overview_level=...
Sina's user avatar
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Why can't my sentinel_1 image dataset be fully mosaicked?

I screened the VH polarization bands of the Sentinel1 images at different dates and mosaicked them, but the final mosaic images obtained were incomplete and only partially. Here is my code var ...
mengqian hu's user avatar
1 vote
1 answer
164 views

Using NDVI thresholds as a condition for successive elaborations in Google Earth Engine

From Sentinel-1 and Sentinel-2 it was created an image collection of 255 images, each with 5 bands: ndvi, VV_corr (VV corrected for the incidence angle), VV_diff (VV_corr difference between two ...
benedetta's user avatar
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Resampling Sentinel-1 GRD data - should it be converted to linear scale before resampling?

I am trying to resample Sentinel - 1 data(original resolution of 10m) to 500m in GEE platform. #Resampling the image to 500m def resamp(image): resampd = image.reduceResolution( ...
CP Rajendiran's user avatar
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1 answer
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Issues implementing data fusion in EO Browser

I am trying to implement this custom script for flood mapping in EO Browser. I have added the datasets using the additional datasets button, and specified the required timelines, but I keep getting ...
Opegraphy's user avatar
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Problem Facing while performing Interferometry using Sentinel-1 image

I am using sentinel 1 data to extract the surface elevation using snaphu-unwrap tool. I perform all the steps according to literature and all the steps provide data too. However in the last step where ...
H.akter's user avatar
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1 answer
272 views

Missing tiles in Sentinel 1 data

I am working with VV/VH Sentinel 1 descending data in Google Earth Engine but there are large areas misisng as shown in the screenshot below. The image indicates the mean data from 1-31 August. The ...
Simba06's user avatar
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1 vote
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gdalwarp antimeridian problem on TIF with GCPs

I've got a non-projected TIF with 440 GCPs (a Sentinel-1 image) that crosses the antimeridian. Normally I just call gdalwarp with -t_srs (in this case 'epsg:3031' Antarctic Polar Stereographic), ...
scalt's user avatar
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1 vote
2 answers
429 views

Exporting SNAP S1 preprocessing model as Python script

I am new to SNAP and Sentinel 1. I am using SNAP for preprocessing of the Sentinel-1 image, however, I am dealing with large S1 datasets so the preprocessing time is long. Can I export the model to a ...
Tilok Chetri's user avatar
1 vote
1 answer
1k views

Speckle filter Sentinel 1 in Google Earth Engine

Are radar images already processed with speckle filter and in decibels? Below is my code, I am looking for a way to adapt it to those processes, though I don't know if the speckle can be added before ...
Moisés Jara López's user avatar
1 vote
1 answer
41 views

Create a minimum and maximum raster from a stacked raster (series of images) in Google Engine

I am trying to write a script that can output a raster file based on the highest and lowest values ​​found in the list of rasters. It is similar to what r.series does in QGIS-GRASS. How can I do this? ...
Moisés Jara López's user avatar
1 vote
1 answer
466 views

Smoothen the Sentinel-1 Time Series Graph Using Google Earth Engine

In order to study the growth pattern of crops, I tried to smoothen the Sentinel-1 time series graph using the following code but got the error. Error: ImageCollection (Error) ImageCollection.reduce: ...
Reflex_180's user avatar
3 votes
3 answers
682 views

Renaming band names with GeoTIFF in Google Earth Engine

I am trying to rename the band names of my raster stack in GEE. Here is what I have tried so far: var start_date = ee.Date('2020-11-01'); var finish_date = ee.Date('2020-12-01'); var orbit = '...
Gulnihal's user avatar
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Sentinel 1 stripping artifact

I am processing a S1 SLC image as follows: Read>Apply orbit file>S1 TOPS Split>Radiometric Calibration (complex)>S1 TOPS Deburst>Polarimetric Speckle filter>Terrain correction (Range ...
Marlon Calispa's user avatar
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1 answer
173 views

Less data from Sentinel 1B

I am trying to access Sentinel 1 data from Google Earth Engine. For my study area which is a part of the Himalayan region I am getting only few data from Sentinel 1B for the year 2019 and I am not ...
Chandra Prabha's user avatar
1 vote
1 answer
301 views

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 ...
Krishna Kafle's user avatar
1 vote
0 answers
623 views

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 = ...
Chandra Prabha's user avatar
2 votes
0 answers
48 views

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 ...
Dessoul's user avatar
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3 votes
1 answer
189 views

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 ...
Philipp R's user avatar
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2 votes
0 answers
215 views

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?...
benedetta's user avatar
  • 138
4 votes
1 answer
2k 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 ...
Flash Thunder's user avatar
4 votes
2 answers
714 views

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 ...
Desh's user avatar
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2 votes
1 answer
686 views

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 ...
Monish's user avatar
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