Questions tagged [sentinel-1]

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

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249 views

Sentinel-1 SAR image is displayed upside down

I am looking at Sentinel-1 SAR image downloaded from ESA Copernicus - dhus location around south of Tokyo, Japan. File format is GeoTIFF. It looks good in QGIS. However, if I use SAGA, or SNAP, or ...
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0answers
32 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
75 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 ...
2
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0answers
43 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
64 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
203 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 ...
1
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0answers
26 views

GEE - Sentinel 1 - Instrument Mode 'SM' doesn't return any results

I am trying to visualize some Sentinel 1 strip maps from Tristan da Cunha in GEE (which I know exist based on scihub) - but my code doesnt return them. Any suggestions? < // Filter the collection ...
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0answers
20 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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0answers
23 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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0answers
92 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
70 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
385 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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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 ...
0
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1answer
22 views

error:Required argument (index) missing to function: List.get(list, index)

I have written a code in GEE retrieves images from sentinel 1 and suppose to display those images. I have created a for loop that suppose to display those images but for some reason I am getting the ...
0
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1answer
30 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
24 views

Obtaining same classification results using VH and VV polarization for Sentinel-1 data

I am performing an image classification(Random Forest) for obtaining rice and non rice areas from Sentinel-1 data. As a result am obtaining same classification accuracies for both polarizations. I ...
0
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1answer
115 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/...
0
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0answers
83 views

Geoserver 2.15 error when rendering a geotiff with normalize and StretchToMinimumMaximum sld

I have been supplied an SLD file and a raster dataset. The raster data is a processed sentinel-1 scene. Here is the SLD: <?xml version="1.0" encoding="UTF-8"?> <StyledLayerDescriptor ...
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0answers
188 views

Blank Image After Terrain Correction

I am new to snap. I have downloaded sentinel 1 image from ESA. I have performed radiometric cal-liberation as well as speckle filtering. After that, when I tried to perform terrain correction, the ...
0
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0answers
39 views

Are there absolute minimum or maximum values for Sentinel-1 GRD images?

Sentinel satellite imagery has become a standard product for operational Earth observation. For the SAR case, this holds for Sentinel-1 ground-range-detected (GRD) imagery, in particular when terrain-...
0
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1answer
66 views

Changes in extent in sentinel image while calibration with snap tool

i have a problem with the extents of my sentinel 1 image, actually as shown in the image above, am selecting the frame 1 to download from ESA, when i process the snap tool to calibrate i only get the ...
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0answers
220 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
78 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 ...
0
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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:...