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Questions tagged [sentinel-1]

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

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1 vote
1 answer
375 views

Pixel Location of Sentinel 1 & Sentinel 2 and SRTM

I am processing integration S1, S2 and SRTM, since their pixel grid does not align with each other I am figuring out how to snap with them all into one grid. Before coming with specific reprojection ...
0 votes
1 answer
16 views

Sentinel-1 query throws error: Collection.geometry: Unable to perform this geometry operation. Please specify a non-zero error margin. (Error code: 3) [closed]

I am trying to pull Sentinel-1 data via GEE for my master thesis and have found the following code to simplify things: https://github.com/adugnag/gee_s1_ard/tree/main/python-api It works perfectly, ...
0 votes
1 answer
169 views

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 ...
2 votes
1 answer
198 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 ...
0 votes
0 answers
21 views

Issue with Opening Sentinel-1 Product in SNAP: GDAL Data Type Error

I am encountering an error when trying to open a Sentinel-1 product in SNAP (Sentinel Application Platform). The error message is as follows: I am looking for guidance on how to resolve this issue. ...
1 vote
1 answer
2k views

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 ...
1 vote
1 answer
2k 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 ...
0 votes
1 answer
1k views

snaphu export error using SNAP

I used SNAP Sentinel 1 to calculate subsidence. After snaphu export I open snaphu.conf and copy command as below then run it in Terminal. I got the following error in picture:
1 vote
1 answer
26 views

Lines in median image created from Seninel-1 image

I am trying to create the median image of the coastal regions of Bangladesh. The imagecollection has around 319 images. When creating the median image, I get some lines as shown in the image below I ...
0 votes
1 answer
18 views

RVI does not catch deforestation : hypothesis

I'm actually working on a deforestation mapping in Papua. I'm trying to use NDVI (with Sentinel 2) and RVI here is presented a time series analysis of the two signal on a deforestation : The RVI ...
0 votes
1 answer
711 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/...
0 votes
1 answer
42 views

Google Earth Engine - Filter Sentinel 1 by time not date

So I'm trying to filter sentinel-1 data in Google Earth Engine by time specifically rather than date. I'm trying to avoid morning acquisitions. So I know that the acquisition start time is contained ...
1 vote
1 answer
1k 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 ...
1 vote
0 answers
24 views

Pattern 'VH' did not match any bands : Sentinel 1 between 2014 and 2017

I'm trying to use Sentinel 1 images on GEE in order to compute RVI between 2014 and 2017. While I'm seeing the VH band after 2017 I don't get any between 2014 and 2017. Does anyone have an idea of the ...
0 votes
0 answers
41 views

How to retrieve Sentinel-1 data with specifying orbit direction (ascending or descending) using OpenEO

I am using Python's API for OpenEO. This is the code I have for the datacube: sentinel1_cube = con.load_collection( "SENTINEL1_GRD", spatial_extent={"west": 21.60, "south"...
0 votes
1 answer
30 views

Dictionary.get: Dictionary does not contain key: bucketMeans error when mapping Otsu thresholding with edge detection

I'm using Google Earth Engine Python API in Colab to carry out surface water delineation with Sentinel-1 data. The analysis uses Otsu thresholding with edge detection as described here: https://google-...
1 vote
0 answers
31 views

Stacking two TIFF images with rasterio or GDAL - each TIFF has different projections and sizes

I have two images with different projections, sizes, resolutions and area covered. Let's call these two images 'MPF' - which covers a huge part of the Arctic reiong, and 'S1' (sentinel-1) which covers ...
0 votes
0 answers
15 views

Get specific range of dates when flood value is low in GEE Sentinel-1

I am new at GEE and I am trying to do some flood analysis, I already have a time series of flood for one point, I did it getting the value from VV band of sentinel-1. Now I want to get the range of ...
5 votes
3 answers
2k views

Resolving Sentinel-1 Interferogram Unwrapping error when constructing DEM/DSM?

I have been trying to create a DSM of a coast and some islands, and have run into some issues regarding how the data looks in the unwrapped interferogram (which affects my height data). I have been ...
16 votes
5 answers
33k views

Finding ways to get free radar (SAR) satellite imagery data sets [closed]

I am looking for finding ways to obtain free (non-commercial use) sources of synthetic aperture radar (SAR) satellite imagery. Does anyone know of sources?
0 votes
0 answers
58 views

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 ...
0 votes
0 answers
116 views

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 ...
0 votes
0 answers
19 views

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 ...
0 votes
0 answers
62 views

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 ...
0 votes
1 answer
40 views

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.
0 votes
0 answers
48 views

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: ...
2 votes
1 answer
113 views

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 ...
0 votes
1 answer
111 views

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, ...
0 votes
0 answers
12 views

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 ...
3 votes
1 answer
73 views

Complex SAR values in Interferogram

By what I understand, a "standard" slc from a SAR has complex values for each pixel. Here the phasor consists of the magnitude and the relative phase. What I don't understand is the complex nature of ...
2 votes
0 answers
68 views

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 ...
0 votes
0 answers
27 views

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 ...
1 vote
1 answer
322 views

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 ...
3 votes
1 answer
263 views

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 ...
0 votes
2 answers
155 views

Threshold Standardization in S1 data?

I am trying to extract waterbody for Vietnam for last 5 years using S1 data in SNAP tool, however the backscatter coefficient value keeps on changing for the years. Is there any way to Standardize ...
1 vote
1 answer
1k views

Creating a "VV","VH","VV-VH" composite for each S1 image in loop using GEE

I would like to create a "VV","VH","VV-VH" composite for each feature in my s1 collection. I am not familiar with loops in GEE. I filtered the data. var myCollection = ee.ImageCollection('...
0 votes
1 answer
1k views

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 ...
1 vote
1 answer
237 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. ...
0 votes
0 answers
106 views

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&...
3 votes
2 answers
3k views

Calculating water occurrence of Sentinel-1 images in Google Earth Engine

I would like to derive the occurrence of surface water bodies from Sentinel-1 image collection in the Google Earth Engine.In my example I could already compute the water mask using Otsu’s method for ...
3 votes
1 answer
1k views

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 ...
1 vote
1 answer
211 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= ...
2 votes
1 answer
181 views

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 ...
0 votes
1 answer
156 views

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 ...
1 vote
0 answers
110 views

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 ...
1 vote
0 answers
155 views

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 ...
2 votes
1 answer
175 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 ...
3 votes
3 answers
5k views

How to analyze Vegetation Index using Sentinel-1 SAR Imagery?

I am using the ESA open scientific data hub for Sentinel 1 SAR imagery (Interferometric Wide swath SLC VV polarization) and would like to know how to perform vegetation health analysis from this data? ...
1 vote
1 answer
72 views

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 ...
0 votes
1 answer
113 views

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 ...

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