Questions tagged [sentinel-1]
Remote sensing satellites with a C-band synthetic aperture radar sensor.
198
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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 ...
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Extracting multiple image values to point in GEE - getting empty out put
I am trying to extract values of sentinel-1 descending pass data for a given point location for a given time period. Though there are images in the given location for the given time period, I am ...
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Sentinel-1 No products found - Looking for alternatives
I'm interested in doing flood mapping for a specific region, using SAR images from before and after the event.
However, Sentinel-1 images are missing for this region (no products for more than 8+ ...
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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), ...
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Getting sigma0_VV and sigma0_VH bands from Sentinel-1 SAR data through ASF Data Search website? [duplicate]
I want to build a CNN model to estimate the soil moisture content using images from Sentinel-1 which I thought of getting from ASF(EarthData). For reference, I referred a journal published on mdpi and ...
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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 ...
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124
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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 ...
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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?
...
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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: ...
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3
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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 = '...
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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 ...
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29
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Incidence angle meta-data for Sentinel 1 GRD on AWS
I have seen how incidence angles can be obtained for Sentinel 1 sigma-0 backscatter when processing from the SLC product with SNAP. However, I want to use the pre-processed GRD product. I couldn't ...
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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 ...
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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 at Filtering images that completely overlap area of interest in Google Earth Engine, except that I am using a shapefile.
I have a shapefile of ...
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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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1
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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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0
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103
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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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35
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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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1
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442
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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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213
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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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55
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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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178
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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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282
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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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275
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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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1
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122
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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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2
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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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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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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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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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189
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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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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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447
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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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496
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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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231
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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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65
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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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1
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175
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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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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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251
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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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485
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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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