Questions tagged [sentinel-1]
Remote sensing satellites with a C-band synthetic aperture radar sensor.
114
questions
1
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1answer
44 views
Creating a “VV”,“VH”,“VV-VH” composite for each S1 image in loop using GEE
I would like to create a "VV","VH","VV-VH" composite for each feature in my s1 collection. I am not familiar with loops in GEE.
I filtered the data.
var myCollection = ee.ImageCollection('...
0
votes
1answer
30 views
Reproject image collection according to the projection of another image collection
I have two image colelctions. one of sentinel 1 and one of sentinel 2.
I want to reproject the sentinel 1 so its' projection and cell size would be like the sentunel 2 images.
It worked for me when I ...
0
votes
1answer
24 views
GDAL Sentinel-1 pixel size
We know that fields related to "Geotransformation" and "projection" are empty when one tries to access these information using gdal on Sentinel-1 (at least the GRD products).
I normaly use:
gdal....
0
votes
1answer
25 views
Pixel resolution units
I am working with Sentinel-1 images. at this time I am focusing on S1-GRD products.
Based on the Sentinel-1 dodumentation we know that GRE images are the same SLC images which have gone through ...
1
vote
1answer
34 views
Different number of observations when using SampleRegions
I have a code in GEE which creates two images from sentinel-1 (SAR) and from sentinel-2 (NDVI) , creates from them paired image and then creates scatter plot from the two bands in the image. In order ...
1
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0answers
26 views
SAR calculating distance between 2 points
I am playing around with ESA's SNAP software and Sentinel-1 data and I was curios if it is possible to measure the ground distance between 2 points in a radar image. For example let's say that I am ...
4
votes
1answer
45 views
Sentinel-1a real azimuth resolution
I was exploring this satellite's payload characteristics on ESA's website and I saw that it's azimuth resolution varies a lot. For example azimuth resolution for IW mode is 22m (https://sentinel.esa....
0
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1answer
43 views
Internal problem using Google Earth Engine function
I need help solving this GEE internal error. I am trying to reduce my script lines in GEE. So, I tried to use a single function to compute polarization indexes.
However, the console shows a warning ...
0
votes
0answers
19 views
Missing Sentinel 1 Relative Orbit Images?
I know I am missing something here. I have been trying to get images with the same relative orbit in Alaska. With 2 satellites going, each returning every 12 days shouldn't this relative orbit (131) ...
0
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1answer
49 views
'Streaking' on Sentinel 1 Images in GEE?
I am interested at looking at Sentinel 1 imagery from Alaska. However when I pull up my images they seem to have 'streaking' (elongation of the pixels in the direction of the slopes). I think this is ...
1
vote
1answer
36 views
Stack 3 layers and display them as one in GEE
I have used this code https://www.gears-lab.com/intro_rs_lab8/ in order to learn and practice my SAR-1 skills.
I have created an almost similar code, but few things are not clear to me regard this ...
3
votes
1answer
65 views
SNAP error encountered with Sentinel-1 SAR from Google Earth Engine
I have downloaded Sentinel-1 SAR images from GEE in VV and VH polarization.
I have two groups of images: 17 images in VV polarization and 17 images with VH polarization.
I have a model that is ...
0
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0answers
17 views
SNAP Problem with Graph builder
I have a model in Snap that suppose to correct my sentinel 1 image. I have saved the model and load it again and now whenever I try to run the model I get red message on the bottom that the process ...
1
vote
1answer
71 views
GEE: Series name using ui.Chart.image.regions
I uploaded a shapefile of some points, and I want to extract backscatter values from that points. When I do it, I can't recognize them in the chart using ui.Chart.image.regions.
Each point is called ...
0
votes
1answer
88 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 ...
2
votes
1answer
47 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
29 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 =...
1
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0answers
30 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 ...
2
votes
1answer
42 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 ...
0
votes
1answer
37 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 ...
2
votes
1answer
54 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 ...
1
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0answers
31 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
41 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'...
3
votes
0answers
130 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
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3answers
135 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
53 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
34 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
32 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
147 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
106 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
2answers
197 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
66 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 ...
2
votes
1answer
674 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
233 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
341 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
174 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
120 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
428 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
115 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
328 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
48 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 ...
2
votes
2answers
842 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 ...
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
1answer
488 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
44 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
73 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
242 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
80 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
361 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
2k 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 ...
