Questions tagged [sentinel-1]
Remote sensing satellites with a C-band synthetic aperture radar sensor.
93
questions
2
votes
0answers
61 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 ...
0
votes
3answers
56 views
Downloading Sentinel images from Copernicus Scihub?
I've been trying to download a Sentinel-1B image from Copernicus off and on for a couple weeks. I can never get the download to complete; in fact, it rarely gets about a couple percent. I've tested my ...
0
votes
1answer
46 views
Calibration annotation data for Sentinel-1 images downloaded from Sentinel Hub?
I received some Sentinel-1 tiff images that were downloaded via the WCS service, so they're just the tiff files, not the full SAFE-format products. They're for the IW GRD product, and my ...
0
votes
1answer
26 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 ...
0
votes
0answers
21 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 ...
1
vote
1answer
59 views
Tile Grid for Sentinel -1
I'm new with GIS.
I would like to know if there is a defined tile grid for Sentinel-1.
For Sentinel-2 images, there is a defined grid with UTM code, Latitude band and Square.
There is something ...
2
votes
1answer
55 views
How to increase or decrease the spatial resolution of a band in Google Earth Engine?
In LANDSAT
var mndwi = ee.Image("LANDSAT/LC08/C01/T1_RT_TOA/LC08_148044_20130425").normalizedDifference(['B3', 'B6']).rename('MNDWI')
gives us MNDWI Band
In Sentinel 2 the resolutions of Green ...
0
votes
1answer
102 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/...
1
vote
1answer
40 views
Connection Time out during Terrain Correction in Snap gpt command line process - Sentinel 1
I am processing Sentinel-1 using the Snap command line gpt. The xml file i am using was produced using the graph builder within the SNAP software, and slightly modified to suit my needs. Please see ...
1
vote
1answer
267 views
SAR processing using Python
I would like to batch process Sentinel-1 images in Python.
Previously I have used SNAP (Sentinel-1 Toolbox) to apply Calibration, Multilooks, Speckle Filters, Terrain Correction and then export as a ...
0
votes
1answer
97 views
Sentinel-1 image decible in Google Earth Engine?
I've wrote this code for Sentinel-1 decible image. although it doesn't show any error but decible image contains many NaN values.
Code link: https://code.earthengine.google.com/...
3
votes
1answer
211 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 ...
1
vote
2answers
120 views
Resampling Sentinel-1 to Landsat 8 size and location
I am training a convolutional neural network to classify landcover and I would like to ingest both Landsat 8 and Sentinel-1 into my classifier.
Currently it is working reasonably well for Landsat 8 ...
1
vote
0answers
79 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 ...
1
vote
1answer
204 views
Using terrain correction in SNAP sentinel 1 toolbox removes all the values
I am new to SAR image processing, I have a SAR sentinel 1 dataset downloaded from ESA site: S1A_IW_GRDH_1SDV_20190314T030905_20190314T030930_026328_02F196_2EC3
I am trying to do terrain correction ...
0
votes
0answers
73 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
...
1
vote
1answer
162 views
Getting weekly mean composite in Google Earth Engine?
I am currently working on a time-series in Google Earth Engine. Iam still quite inexperienced, especially when it comes to functions.
I want to extract the mean values of Sentinel1-images for each ...
2
votes
1answer
45 views
What is happening different to my TIFF between export data and arcpy
I am working in FME with TIFFs downloaded from sentinel-1 (SAR). These TIFFs display correctly in ArcMap but in FME is loses its spatial reference and a bound box calculation gives the number of ...
1
vote
1answer
512 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 ...
0
votes
0answers
180 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 ...
5
votes
0answers
1k 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 ...
0
votes
0answers
34 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
votes
1answer
316 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, ...
2
votes
0answers
42 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
votes
0answers
62 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 ...
0
votes
1answer
169 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(...
0
votes
1answer
63 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 ...
1
vote
1answer
316 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 ...
1
vote
1answer
1k 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 ...
2
votes
0answers
194 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
vote
0answers
68 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 ...
0
votes
1answer
878 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 ...
1
vote
1answer
387 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:
...
0
votes
0answers
217 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 ...
3
votes
2answers
1k 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: ...
4
votes
1answer
308 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-...
0
votes
1answer
268 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 ...
1
vote
1answer
38 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....
6
votes
1answer
2k 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 ...
1
vote
0answers
367 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 ...
0
votes
1answer
559 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) ...
0
votes
0answers
77 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 ...
1
vote
1answer
174 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 ...
-1
votes
1answer
130 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?
2
votes
3answers
2k 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
votes
1answer
686 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 ...
1
vote
1answer
75 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
votes
1answer
241 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 ...
2
votes
1answer
281 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 ...
3
votes
1answer
657 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:...
