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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0answers
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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0answers
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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1answer
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: ...
3
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1answer
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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1answer
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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1answer
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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1answer
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 ...
2
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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 ...
2
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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 ...
2
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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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0answers
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?
2
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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 ...
