Questions tagged [sentinel-1]

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

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272 views

Histogram matching in Google Earth Engine?

Does anyone know if there is a more GEE-friendly way of achieving this? I'm experimenting with S1 SAR image histogram matching in GEE and was wondering if foremost the code can be improved. Read here ...
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1answer
18 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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18 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
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0answers
112 views

Why is Sentinel-1 using geographic coordinate system and Sentinel-2 projected one?

I was wondering if there's any particular reason for Sentinel-1 to be georeferenced to WGS '84 (a geographic coordinate system), while Sentinel-2 is using UTM (a projected coordinate system). I couldn'...
2
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0answers
238 views

Why gdal does not find gcps coordinates on SENTINEL images?

I use gdalwarp with python to overlay polygons on ENVISAT radar images. Everything goes well for this type of images but when I try with SENTINEL images, gdal does not find the georeferencing. It ...
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0answers
46 views

Sentinel 1 (A and B) Vertical Datum

I have been working through the ASF's "Recipes" for the creation of a DSM from Sentinel 1 (A and B) imagery. I am able to produce a DSM, and am relatively happy with the results in terms of the ...
2
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0answers
88 views

Improving Sentinel 1 Interferometric DSM Accuracy - Removing Surface Anomalies

I have been working through the ASF's "Recipes" for the creation of a DSM from Sentinel 1 (A and B) imagery. I am able to produce a DSM, and am relatively happy with the results in terms of the ...
2
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0answers
351 views

authentication error for accessing data product on scihub through wget

I am new to Sentinel(overall remote sensing domain) and currently trying to download the data products from Scihub using the wget utility on Windows10 machine. However I am getting the below error. I ...
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0answers
666 views

Converting from SAFE (Sentinel-1) to BEAM-DIMAP?

I need to convert Sentinel-1 data from the SAFE format (used by the ESA's Sentinel project) to the BEAM-DIMAP format. I know that GDAL can convert GeoTIFF files (which are used by Sentinel-1) into ...
1
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1answer
32 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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36 views

How to correct slight mismatch of Sentinel 1 GRDH and coastline shapefile?

I'm currently working on Sentinel 1 GRDH data with R (raster, rgdal, sp, rgeos, maptools ...). The geocoding of Sentinel data was made by the following command: gdalwarp(srcfile=paste0(root,"...
1
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1answer
135 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('...
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67 views

SAR calculating distance between 2 points

I am playing around with ESA's SNAP software and Sentinel-1 data and I was curios if it is possible to measure the ground distance between 2 points in a radar image. For example let's say that I am ...
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63 views

Open Image from Sentinel 1 in SNAP problems

I have download SNAP today but I'm facing few problems with upload the image. I have download image from Copernicus Open Acess Hub but whenever I download it I can't open it properly. those are the ...
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57 views

Lag time for Sentinel-1 collection on Google Earth Engine

I tried to access the most recent image from COPERNICUS/S1_GRD collection on Google Earth Engine (GEE) but noticed that the latest available dates back to 15 days. What is the lag time for S1 images ...
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2answers
554 views

Computing MNDWI for Sentinel 2 Images in Google Earth Engine?

MNDWI is the normalized difference of Green Band and SWIR Band. In LANDSAT both are of a similar resolution i.e. 30m. In the case of LANDSAT var landsat8 = ee.Image("LANDSAT/LC08/C01/T1_RT_TOA/...
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0answers
110 views

gdal.Polygonize python Sentinel-1

I am trying to process SENTINEL-1 GRD data using python and gdal. I want to get the shapefile from the input data. I have tried to use gdal.Open() using the following extensions but nothing seems to ...
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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 ...
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70 views
+100

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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9 views

ISCE Interferometry

I am looking for the method of doing interferometry from the software ISCE. I am interested in processing Sentinel 1, RadarSAT, TerraSAR, etc. data. I am new to using the ISCE Software. Is there ...
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23 views

The extraction of the Sentinel-1 backscattering coefficient

I want to do some calculations with the backscatter coefficient of the Sentinel-1 satellite. Do I need to filter the raw data(using mean or sigma Lee) on GEE?
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49 views

Surface area of waterbodies for multiple location using Google Earth Engine

Using this code, I've extracted surface area of water bodies (for a period of 6 years) from sentinel 1 GRD dataset. But how can I compute water area extent of multiple location and produce chart/CSV ...
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14 views

Code for Extraction of pixel values post Temporal Averaging

I tried to write a code for temporal averaging the pixel values of VH polarization from Sentinel 1 collection and downloading the same as a CSV. I get an error "VH value not selected in the ...
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0answers
15 views

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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35 views

Fill no data pixels for specific area (not the whole image) resulting from cloud masking of Landsat 8 multi temporal composite (Google Earth Engine)

I need to conduct a Landuse classification of New Caledonia. I therefore used the Landsat 8 satelite images of one year and created a multi temporal mosaic by a mean function. As most of the areas ...
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0answers
10 views

Extaction of VV and VH values defined in a Feature Class for every point in time

This doubt has been previously discussed I think but still, I would like to get it sorted. I would like to extract the pixel values defined in a polygon from Sentinel1 image time series. This code ...
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48 views

Coregistration of Sentinel 1 images

I am trying to align various Sentinel 1 image over an area with a similar path and row as the S1 images provided on GEE are not coregistered. However, the values change of each image when inspected ...
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1answer
66 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:
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1answer
23 views

The image collection doesn't correspond to my interactive map (Sentinel-1 in Google Earth Engine)

I want to classify water pixels with Sentinel-1 in Google Earth Engine, and I'm using this code I found here: https://mbonnema.github.io/GoogleEarthEngine/07-SAR-Water-Classification/ However, in my ...
0
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1answer
53 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 ...
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1answer
51 views

How to perform subset in Sentinel 1 slc data for PSInSAR processing?

I want to process sentinel 1 slc dataset for PSInSAR analysis.Currently, I am working on SNAP software and following this article 1: https://www.researchgate.net/publication/326655316_ESA_SNAP_-...
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1answer
51 views

GDAL Sentinel-1 pixel size

We know that fields related to "Geotransformation" and "projection" are empty when one tries to access these information using gdal on Sentinel-1 (at least the GRD products). I normaly use: gdal....
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0answers
27 views

Missing Sentinel 1 Relative Orbit Images?

I know I am missing something here. I have been trying to get images with the same relative orbit in Alaska. With 2 satellites going, each returning every 12 days shouldn't this relative orbit (131) ...
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0answers
50 views

SNAP Problem with Graph builder

I have a model in Snap that suppose to correct my sentinel 1 image. I have saved the model and load it again and now whenever I try to run the model I get red message on the bottom that the process ...
0
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1answer
45 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 ...
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0answers
273 views

Sentinel-1 GRD and Sentinel-2 L1C on AWS bucket policy

Recently I started to work with Sentinel-1 data hosted on AWS S3 bucket 'sentinel-s1-l1c'. The bucket is requester pays and requires AWS signature version 4. I need to access the files via HTTP GET ...
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0answers
89 views

Interpreting Sentinel 1 Imagery from Alaska Satellite Facility

The Alaska Satellite Facility's Vertex data portal provides Sentinel 1A/B data, and for some granules they also provide false coloring. Is there some documentation or idea of how they do this ...
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0answers
239 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:...