Questions tagged [sentinel-1]

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

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3
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1answer
637 views

Resampling in Google Earth Engine: exporting Sentinel 1A to Google Drive

I tried to export Sentinel 1A to Google Drive on Google Earth Engine. The function has a parameter name "scale" which determines pixel scale of the exported image. Export.image.toDrive({ image:...
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2answers
607 views

Sentinel-1 missing data gap in adjacent acquisitions

Some months ago I posted Export each image from a collection in Google Earth Engine about exporting Sentinel 1 scenes from a collection and was successful with help from Rodrigo Principe. I now have ...
3
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3answers
1k views

Google Earth Engine: different stretch options

I'm working on a map view that detects new ice using Sentinel-1 together with Google Earth Engine. When adding images to Google Earth Engine I can set the min and max values for my layer in numbers ...
0
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1answer
307 views

Sentinel 1 Extra Wide in Google Earth Engine?

I have managed to display Sentinel-1 IW images in Google Earth Engine following this example but when I change the instrumentMode to EW nothing shows in the map canvas and it says "No bands to ...
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0answers
593 views

SAR processing in R? [closed]

Anyone know if a package for processing SAR data in R exists? Such as doing calibration, terrain correction, classification on e.g. Sentinel 1 data?
2
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2answers
472 views

Has the Sentinel-1 InSAR workflow from SNAP been integrated into GEE?

I'm trying to do some batch InSAR processing on Sentinel-1 image stacks. My desktop doesn't have processing power to run the tool in a timely matter. If I upload the complex SLC data to my Google ...
4
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4answers
2k views

Is there a simple way to collect the Sentinel data of a given ROI?

If you wanted to collect all Sentinel satellite data for a given region of interest (ROI), say, for a given day or time frame - is there any simple way to do it? That means: Without having to download ...
5
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2answers
6k views

Export each image from a collection in Google Earth Engine

I am trying to export each image in a filtered stack of Sentinel-1 images and cannot seem to get it right. Think link suggests using imageCollection.map() and a custom function (such as a geometric ...
0
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3answers
1k views

Sentinel 1 relative orbit

Does somebody know where you can find the relative orbit number of a Sentinel 1 image? I know it should be somewhere in the metadata (the xml-file), but I can't find it.
1
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1answer
218 views

Low Recall for Radar Image Flood Classification

I am following the example here to learn how to classify flood images. I am using a single band of the Sentinel-1 radar imagery. I am able to build and train my model without trouble. The problem is ...
6
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2answers
896 views

Sentinel-1 Data opened with rasterio has no Affine/Transform/CRS

I'm trying to process Sentinel-1 data downloaded from SCIHub using Rasterio. When I open a Sentinel-2 raster taken from the Amazon Web Services Sentinel 2 dataset the Affine, Transform and CRS are ...
2
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0answers
172 views

Radar incidence angle of different images [closed]

I am beginning in radar traitement, I want to know if working with radar image with differents incidence angle is not correct for result, Could the radar image have the same incidence angle for ...
4
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3answers
681 views

Copernicus Sentinel - National Mirrors and Collaborative Ground Segments

Is there an official list of all national mirrors of the collaborative ground segment members for data from the Copernicus Sentinel satellites? So far I found the following: Copernicus Sentinels ...
4
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2answers
537 views

Sentinel API query, rows exceeds maximum number

I am trying to query Sentinel1A data using the Sentinel API, by using the following scripts. from sentinelsat.sentinel import SentinelAPI api = SentinelAPI('username', 'password', ...
0
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1answer
549 views

Sentinel-1: biomass for agriculture

How do can I calculate biomass for some agriculture by using VV and VH polarisation SAR images? I know there are some correlation for HV RADARSAT-2 to get biomass for some agriculture like corn, wheat,...
0
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1answer
645 views

Obtaining something like NDVI value from Sentinel-1 product

Is there a way to get the some data about biomass from sentinel-1 product? Then try to convert it to NDVI value. Maybe have some way to get RGB value?
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0answers
24 views

Tiger WOIS Could not open workflow

Recently I have been trying to use the TIGER WOIS package which looks really useful. I'm trying to use the Flood mapping tool with Sentinel-I data, but I encountered a problem right away. In the ...
5
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2answers
1k 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 ...
0
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1answer
953 views

PS/SBAS Processing of S1 in Envi Sarscape 5.2

I'm processing a stack of s1a images in PS. I am now running the inversion first step. In the progress bar, it is stuck at the 'preliminary candidates selection' for quite some time. I am not sure if ...
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2answers
2k 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? ...
8
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3answers
7k views

Downloading sentinel products using API?

I want to be able to automate or batch download Sentinel data (in particular S2). I am trying to use the OData protocol as described in the Sentinels Scientific Data Hub user-guide on APIs and batch ...
2
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1answer
1k views

Calibration error for Sentinel 1 image in SNAP toolbox

I am working with a Sentinel 1 SLC IW image (VV+VH) and trying to calibrate the data in the SNAP toolbox. However, it keeps returning the error "cannot construct data buffer" Does anyone have any ...
0
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1answer
232 views

Comparing SAR and SRTM, Which data source can produce relatively accurate DEM?

How much accuracy could we can expect from producing DEM from SAR using InSAR techniques as compare to available SRTM 1ArcSec data? Specifically in view of the available Sentinel-1 datasets? Any ...
2
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3answers
1k views

How to remove 'no data' values in sentinel 1 data? - Sentinel Toolbox

I hope anyone can help with this issue: I am using the Sentinel Toolbox to preprocess Sentinel 1 GRDH scenes. Managed to radiometric calibrate, conduct radiometric terrain flattening and geometric ...
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1answer
775 views

Determination of Soil Moisture for a Region Using open Source Data

I want to derive soil Moisture for a region using Landsat and Microwave data could you please help me with the procedure.
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2answers
3k views

Open Sentinel-1 products using ENVI 5.3

Is it possible to open Sentinel-1 products using ENVI 5.3? GeoTiff Sentinel-1 images can be opened independently but I can't open the product (from its xml file) using ENVI. I mean, is SARscape ...
3
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1answer
376 views

How to calculate the Scattering Matrix for a Sentinel-1 image

How can we calculate the elements of the scattering matrix (Spq with p and q being the transmit/receive polarizations), for a Sentinel-1 image? Does the image have to be in a Single-Look Complex (SLC)...
5
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2answers
2k views

Importing Sentinel-1 Image Collection to Google Earth Engine API

I'm currently having an issue with trying to import the Sentinel-1 image collection into the Earth Engine API. My script is as follows: var imgSentinel1 = ee.ImageCollection('COPERNICUS/S1'); Map....
0
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1answer
577 views

Get look angle at a specific coordinate on a SAR image

Can we get the look angle of the SAR sensor on a large image for a given coordinate, if we only have the look angle in the mid-swath (or the near-range & far-range angles)? Do we get the look ...
6
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1answer
5k views

SAR - Using the Intensity or the Amplitude for the classification

In a Sentinel-1 Level 1 Ground Range Detected SAR data product, Intensity = Amplitude * Amplitude. Should the intensity image or the amplitude image be used for radiometric calibration when using ...
4
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1answer
900 views

Otsu thresholding and classic image processing algorithms on radiometrically calibrated Sentinel-1 SAR images

Is it possible to apply the Otsu thresholding (or any other image processing algorithm dedicated to image digital values in the interval [0, 255]) to a Radiometrically calibrated Sentinel-1 SAR ...
5
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2answers
4k views

What's relationship between pixel spacing and resolution?

Let's take as an example the Sentinel-1 SAR satellite for which data is accessible online. The pixel spacing in the range and in the azimuth are found inside the xml files bundled with the product. ...
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1answer
1k views

Why is azimuth resolution worse than range resolution in Sentinel1 (SAR) [duplicate]

Why is the azimuth resolution in Sentinel (SAR sensor) worse than the range resolution? The table in this link gives the resolution for SLC products aquired in the different aquisition modes. In ...
5
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2answers
815 views

Why does the resolution decrease with increasing incidence angle in the Sentinel-1 SAR sattelite

On this link (Sentinel1 webpage for a SLC product), the resolution is written as a range from the highest corresponding to low incidence angle, to the lowest resolution corresponding to high incidence ...
5
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1answer
452 views

Why does the peak of a mountain appear bright on Radar images?

Why does the top of a mountain appear bright on a SAR (radar) image. I know that the peak of a mountain is subject to a layover effect, thus appearing closer on the radar image than the bottom part of ...
5
votes
3answers
209 views

Can a satellite go over the same area in different passes overtime

Can a sun-synchronous satellite (let's consider Sentinel-1) go over the same place, one time in an ascending pass and the next time (or few times after) in a descending pass?
2
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1answer
381 views

Get resolution and whether right/left looking from sentinel metadata

Is it possible in Sentinel hub products to know the resolution of the product and whether the SAR was right or left looking at the scene? I know that it's possible to know if the SAR was operating in ...
1
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1answer
2k views

Extract Differential Interferometry from SENTINEL-1 image

I downloaded some SLC images from scihub.esa.int . And I want to extract Differencial Interferometry from them by using SNAP-ESA software. How can I do it ?
8
votes
1answer
694 views

Remote sensing for Nepal Earthquake [closed]

To any experts who can provide remote sensing data that can help assess impact and damage of nepal earthquake we really need your help to ensure aid is well targeted. Existing data so far is here If ...
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3answers
432 views

Finding Sentinel-1 data from the hub

Can somebody please tell me how to download data from specific locations on the sentinel-1 data hub? I cannot seem to get the geospatial search function to work...
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0answers
236 views

How to visualize a C-band SAR sensor measurement

Files: \measurement\s1a-iw2-slc-vv-20141205t171642-20141205t171705-003587-0043c5-002.tiff Size is 24435, 13472 Coordinate System is `' Metadata: AREA_OR_POINT=Area TIFFTAG_DATETIME=2014:12:05 21:...
5
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3answers
3k views

How to download products from ESA's scihub using OData protocol?

How one can download files programatically using scihub OData protocol and cURL (or other library/program)? You can get a descriptive xml response of the API for a dataset can be obtained by this ...
31
votes
3answers
17k views

How to produce high-resolution DEMs from new Sentinel-1 data?

This is a general question relating to the new Sentinel-1 data. I'm interested in the potential for using this data to create high resolution DEMs in GIS (I use QGIS), to investigate archaeological ...
9
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5answers
25k views

Free radar (SAR) satellite data [closed]

I'm looking for free (non-commercial use) sources of radar (SAR) satellite imagery. Does anyone know of sources?