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Questions tagged [sentinel-1]

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

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22 views

Sentinel-1 SAR Images change detection in Google Earth Engine

I am struggling at the moment trying to detect changes using two SAR images from different times, using COPERNICUS/S1_GRD image collection from Google Earth Engine. Even though I read about quite some ...
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1answer
22 views

How to mosaic multiple Sentinel-1 images in SNAP software?

I am trying to mosaic multiple sentinel sar images in esa snap software. The scenes are acquired from two adjacent tracks. I used the tool S1 slice wizard in snap under radar tool menu. But my images ...
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18 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 ...
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73 views

How to visualize inundation using Sentinel 1 SAR Data?

I am trying to visualize flooding after hurricane Harvey that made landfall on August 25-26 2017. Based on this video, I've been able to obtain the basics of Sentinel-1 SAR imagery. Sentinel 1 comes ...
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8 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-...
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1answer
63 views

Rasterio showing single band images wrong

I'm using rasterio in Python at the moment, and I have no problem when I'm dealing with RGB satellite images. However, if I try using singleband Sentinel 2 images, or a singleband Sentinel 1 image, ...
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23 views

Subsidence mapping with Sentinel 1 by subtract travel time difference

Is there a property in the Sentinel 1 Dataset that gives me the travel time in ms or s (i dont know how long a signal needs to travel to earth and back) of the signal which is send to earth by the ...
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21 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 ...
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21 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 ...
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1answer
49 views

Sentinel-1 HH band not loading in Google Earth Engine

While importing the VV band in Sentinel-1 datasets from GEE, there is no problem when I use the following lines: var collection = ee.ImageCollection('COPERNICUS/S1_GRD') .filterBounds(...
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1answer
31 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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203 views

How to obtain DN values of Sentinel 1 Data (preferably GRD) given actual location coordinates using Python3 GDAL/rasterio/any_other_library?

location of Svalbard 77.8750° N, 20.9752° E I have sentinel-1 microwave data (in GRD FORMAT) downloaded from Copernicus. Each image is HH or HV polarized. How do I calculate the DN value from ...
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33 views

How to get pixel position of a location, given latitude and longitude, in Python 3? [duplicate]

I have a sentinel-1 GRD product, downloaded from Copernicus. I have used a shapefile created in QGIS and used 'gdalwarp' to crop it. Now, I'd like to open that file in Python using gdal or some other ...
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96 views

How to Increase snappy memory in ESA SNAP?

I encountered with some error in SNAP provided by ESA on Windows 10 (64-bit) with 8GB RAM, like can not construct data buffer. After some research, I came to know its the problem of RAM availability ...
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1answer
368 views

Looping ImageCollection and FeatureCollection together in Google Earth Engine

I am looking for a way to filter images for certain dates per feature in the feature collection. I want a function that would take each individual feature from the feature collection and then check ...
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57 views

Sentinel-1 SNAP toolbox image view does not export as Geotiff i.e with spatial reference

I have a source image (S1) in WGS 84 UTM 24 N projection. The source image is used for a segmentation analysis. Using the k-means segmentation process, the source image is segmented and outputted as a ...
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98 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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51 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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65 views

Output arrays from Rasterio masks of Sentinel-1 prodcuts from the same shapefile are not the same shape

I am masking Sentinel-1 data using rasterio.mask.mask. I had first reprojected all Sentinel-1 products I have downloaded using command line gdalwarp as Sentinel-1 data is georeferenced but no ...
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1answer
324 views

Extracting pixel values by points from multi-band image and converting to table in Google Earth Engine?

I would like to extend this answer to Extracting pixel values by points and converting to table in Google Earth Engine? in order to extract values from a multi-band image. I am using the example ...
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1answer
162 views

Why pixel spacing measures as spatial resolution in Sentinel-1 SAR images

I have been processing Sentinel-1 SAR images-both medium and high resolution. Looking into the documentation, the pixel spacing and resolution have been specified as: High resolution level-1 GRD: ...
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137 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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2answers
374 views

Determining if Sentinel-1 orbit is ascending or descending from absolute orbit number?

The file name convention for the Sentinel-1 mission is MMM_BB_TTTR_LFPP_YYYYMMDDTHHMMSS_YYYYMMDDTHHMMSS_OOOOOO_DDDDDD_CCCC, where MMM: mission identifier (S1A, S1B) BB: mode/beam (IE/EW/WV) TTT: ...
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137 views

What is the annual data volume produced by the individual Sentinel satellite missions?

I am wondering how big the volume of the data produced by Sentinel-1, Sentinel-2 etc. in a given year. For Sentinel-1, it'd be most interesting to know the data volume of all SLC images, for Sentinel-...
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126 views

Extracting a polygon from slanted Sentinel satellite image using R

I have a Sentinel image, the coordinates of the boundary are given. I want to extract/subset a polygon from it. I am using R and don't have any prior experience in GIS. I have downloaded some ...
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27 views

Correlating RISAT and Sentinel-1 data

The Sentinal-1 dataset's metadata contain the following values: range_spacing, azimuth_spacing, incidence_near, incidence_far. What are corresponding names for these values in the RISAT Band_Meta....
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28 views

Processing georeferenced RISAT dataset in SNAP toolbox

I am working on SAR datasets, building a calibration software in python. I need to be able to get the data in the vertical and horizontal alignment as the Sentinel-1 datasets are. However it turns out ...
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200 views

Sorting Sentinel-1 image collection by incidence angle in Google earth engine

I am very new to earth engine, and am hoping someone might be able to help with the below. I want to get images from only a certain range of incidence angles, is it possible to somehow create a ...
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62 views

Adding color to a min-max range of VH and VV band image layers (Sentinel 1-a & b)

I'm trying to get the color to only be displayed in the pixels that are within the min-max values that I have set to be shown for the VH and VV band. Basical,ly I want pixels that within the min/max ...
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48 views

Sentinel 1 Acquistion Time Not Understood

So I am working with Google Earth Engine and I have retrieved all of the viable Sentinel 1 returns over my region of interest. By viable, I mean that I have filtered all sentinel 1 returns spatially ...
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1answer
484 views

Mosaicking a Image Collection by Date (day) in Google Earth Engine

I have an image collection of Sentinel-1 data over 3 years filtered by a region of interest that spans 3-4 tiles, and want to know the best way to mosaic all the images (tiles) that were taken on the ...
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86 views

What happens to the pixel spacing and resolution after a sub-sampling?

After I sub-sampled a Sentinel image (that has a resolution of 93 rg x 87 az, and a pixel spacing of 40 rg x 40 az) with the SNAP toolbox or MatLab, what happens to both of those features if I use for ...
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244 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 ...
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1answer
309 views

Water body Extraction using SNAP [duplicate]

I am using SAR image and SNAP tool to extract water bodies. Followed the below link ( http://www.un-spider.org/advisory-support/recommended-practices/recommended-practice-flood-mapping/step-by-step) ...
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165 views

SAR processing in SNAP

I am new to both S1 images and SNAP tool box. Trying to extract surface water body by using S1 images in SNAP tool. Followed the below link http://www.un-spider.org/advisory-support/recommended-...
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56 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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38 views

Cannot make a search using Sentinel tool in ArcMap

I am trying to make a search by sentinel tool after adding it to ArcMap. it always gives me this error Executing: Search rayyad ***** # 2A 28.01.2018 26.02.2018 "10,9451255356701 51,9029172506069 11,...
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132 views

High resolution SAR for Sea Surface Salinity near coasts (Sentinel 1)

Microwave remote sensing missions such as ESA's SMOS are used to compute variables such as soil moisture and sea surface salinity, using the dielectric constant. This is done on large spatial ...
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1answer
87 views

Is there any way to obtain high resolution images similar to RGB True colour images from Sentinel's SAR-C SAR data?

Is there any methods which I could use to obtain any good quality true colour images from Sentinel 1 SAR Data?
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3answers
1k views

Reducing Sentinel-1 timeseries in Google Earth engine

For my research I want to have sentinel-1 layers for each month and in order to reduce the amount of border noise I used the imageCollection.median() on a Sentinel-1 timeseries within the Google Earth ...
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1answer
408 views

Classifier with SVM algorithm for sentinel 1A image

I am classifying rice for the Red River Delta with 2 class: class 0: Rice class 1: Not rice I used svm classifier algorithm. However, after running the code, the classifier operated for a long time ...
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1answer
57 views

Incidence angle of geographic cordination

I am processing Sentinel 1 data with ENVI SARscape (can process also with gamma if it helps me) for earthquake inversion. Due to the fact that I want to use ascending and descending acquisition, I am ...
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1answer
175 views

Adding graticule overlay to satellite image

I'm developing a python script to turn Sentinel-1 satellite images in .SAFE-format into easy-to-read jpeg images. The calibration and projection works fine using gdal, but I am having trouble with the ...
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1answer
174 views

Do we get world grid with date and time of visit of Sentinel 1 and Sentinel 2?

I have an ROI and I am interested in knowing the below for it Tile Number Date and Time of revisit as calendar for whole year This will enable me to specify the tile number(s) and fetch the data for ...
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1answer
443 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
510 views

Export mosaic images from a collection in Google Earth Engine

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 ...
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3answers
907 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 ...
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1answer
228 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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415 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?
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1answer
349 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 ...