The Stack Overflow podcast is back! Listen to an interview with our new CEO.

Questions tagged [sentinel-1]

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

Filter by
Sorted by
Tagged with
0
votes
1answer
14 views

Google Earth Engine - Blend Sentinel-1 SAR Images?

Does anybody know why I am getting these strips across my Sentinel-1 images and how to fix it? I am using multiple images over Mozambique between January 1st and January 13th. I want to use this ...
0
votes
2answers
670 views

Obtaining something like NDVI value from Sentinel-1 product

Is there a way to get the some data about biomass from sentinel-1 product? Then try to convert it to NDVI value. Maybe have some way to get RGB value?
1
vote
0answers
28 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 ...
0
votes
1answer
17 views

GEE - S1 imagery appears as RGB instead of grayscale

I would like to visualize a collection of VV Sentinel 1 imagery in Google Earth Engine. This is what I have done so far: <// Filter the collection - VV only depending on geometry and date var s1 =...
2
votes
1answer
33 views

Zero elements in my ImageCollection

I'm trying to obtain Sentinel-1 images in Google eart hengine and to have 3 different imagecollections: 1. HV 2.HH 3.VV I have written the following code but whenever I check my image collection it ...
1
vote
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 ...
0
votes
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 ...
3
votes
1answer
253 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 ...
2
votes
1answer
31 views

Import Sentinel-1 Image on GEE and clip it with geometry

I'm trying to create image collection from images of Sentinel-1.I have written a code that suppoose to create image collection, clip it with a given polygon and then count the number of images in the ...
0
votes
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 ...
5
votes
1answer
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 ...
1
vote
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 ...
2
votes
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'...
4
votes
5answers
2k views

Simple way to collect the Sentinel data of a given ROI?

If you wanted to collect all Sentinel satellite data for a given region of interest (ROI), say, for a given day or time frame - is there any simple way to do it? That means: Without having to download ...
0
votes
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 ...
2
votes
0answers
77 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
71 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
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/...
5
votes
3answers
218 views

Can a satellite go over the same area in different passes overtime

Can a sun-synchronous satellite (let's consider Sentinel-1) go over the same place, one time in an ascending pass and the next time (or few times after) in a descending pass?
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 ...
6
votes
2answers
6k views

Export each image from a collection in Google Earth Engine

I am trying to export each image in a filtered stack of Sentinel-1 images and cannot seem to get it right. Think link suggests using imageCollection.map() and a custom function (such as a geometric ...
0
votes
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 ...
1
vote
1answer
79 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 ...
3
votes
2answers
2k views

How to analyze Vegetation Index using Sentinel-1 SAR Imagery?

I am using the ESA open scientific data hub for Sentinel 1 SAR imagery (Interferometric Wide swath SLC VV polarization) and would like to know how to perform vegetation health analysis from this data? ...
2
votes
1answer
64 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 ...
1
vote
1answer
45 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
354 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 ...
8
votes
3answers
7k views

Downloading sentinel products using API?

I want to be able to automate or batch download Sentinel data (in particular S2). I am trying to use the OData protocol as described in the Sentinels Scientific Data Hub user-guide on APIs and batch ...
0
votes
3answers
441 views

Finding Sentinel-1 data from the hub

Can somebody please tell me how to download data from specific locations on the sentinel-1 data hub? I cannot seem to get the geospatial search function to work...
0
votes
1answer
125 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/...
1
vote
2answers
140 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 ...
0
votes
3answers
1k views

Sentinel 1 relative orbit

Does somebody know where you can find the relative orbit number of a Sentinel 1 image? I know it should be somewhere in the metadata (the xml-file), but I can't find it.
0
votes
2answers
3k views

Open Sentinel-1 products using ENVI 5.3

Is it possible to open Sentinel-1 products using ENVI 5.3? GeoTiff Sentinel-1 images can be opened independently but I can't open the product (from its xml file) using ENVI. I mean, is SARscape ...
1
vote
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 ...
1
vote
1answer
254 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 ...
2
votes
2answers
492 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 ...
0
votes
0answers
84 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
2answers
628 views

Sentinel-1 missing data gap in adjacent acquisitions

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 ...
1
vote
1answer
214 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
46 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
598 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
192 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 ...
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 ...
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: ...
0
votes
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
votes
1answer
360 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
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
votes
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 ...
1
vote
1answer
404 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
1answer
191 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(...