Questions tagged [sentinel-1]
Remote sensing satellites with a C-band synthetic aperture radar sensor.
142
questions
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1answer
20 views
Downloading Sentinel-1 SLC in individual bursts
I'm about to embark on a DInSAR time series project, for which I will be using Sentinel-1 single look complex (SLC) data.
Sentinel-1 SLC products are only available in Interferometric Wide-swath (IW) ...
0
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0answers
7 views
Extaction of VV and VH values defined in a Feature Class for every point in time
This doubt has been previously discussed I think but still, I would like to get it sorted.
I would like to extract the pixel values defined in a polygon from Sentinel1 image time series. This code ...
2
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1answer
19 views
Downloading data from Sentinel's API - LTA error
I am trying to download data and I get this error when I am using the sentinelsat Python API:
sentinelsat.sentinel.SentinelAPILTAError: HTTP status 500 Internal Server Error: Trying to download an ...
0
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0answers
29 views
Coregistration of Sentinel 1 images
I am trying to align various Sentinel 1 image over an area with a similar path and row as the S1 images provided on GEE are not coregistered. However, the values change of each image when inspected ...
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0answers
10 views
Complex SAR values in Interferogram
By what I understand, a "standard" slc from a SAR has complex values for each pixel. Here the phasor consists of the magnitude and the relative phase. What I don't understand is the complex nature of ...
0
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1answer
47 views
Lost the properties in ImageCollection after Mosaicking a Image Collection in Google Earth Engine
As per the question from Mosaicking a Image Collection by Date (day) in Google Earth Engine
I tried the answering code from Rodrigo E. Principe.
That code is very good. I can mosaic all the images (...
0
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1answer
35 views
snaphu export error using snap
I used SNAP sentinel 1 to calculate subsidence. After snaphu export I pen snaphu.conf and copy command as below then run it in Terminal I got The following error in picture:
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0answers
17 views
Offset in LOS displacement from SNAP InSAR
I submitted SNAP InSAR jobs for a region containing a river with different sets of values of 4 parameters:
Azimuth Coherence window size (ACWS)
Range Coherence window size (RCWS)
Azimuth multilooking ...
0
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1answer
18 views
Various parameters in submitting SNAP InSAR jobs
I am a newbie to the InSAR technique, and I am working with this currently. When submitting jobs, I have to set the values of Azimuth Coherence Window Size, Range Coherence Window Size, Azimuth ...
1
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1answer
22 views
How can I filter my image collection based on incidence angle in SAR?
Im completely new to SAR, and Im trying to understand the basics.
Im studying a small area in Google Earth Engine, and Im making timeseries of water pixels with SAR imagery. However, I observed ...
0
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1answer
17 views
The image collection doesn't correspond to my interactive map (Sentinel-1 in Google Earth Engine)
I want to classify water pixels with Sentinel-1 in Google Earth Engine, and I'm using this code I found here: https://mbonnema.github.io/GoogleEarthEngine/07-SAR-Water-Classification/
However, in my ...
0
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1answer
37 views
Downloading Sentinel-1 VH time-series for polygon
from sentinelhub import FisRequest, Geometry, CRS
time_interval = (start_date.strftime("%Y-%m-%d"), end_date.strftime("%Y-%m-%d"))
fis_request = FisRequest(layer=XXX,
...
0
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1answer
24 views
Sentinel-1 missing data gaps between two images GEE
I am trying to export a Sentinel-1 mosaic with the code below. I keep getting this missing data gap between the two images. Even when I export the images separately, and mosaic them myself in ArcGIS, ...
1
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1answer
35 views
Map function over imagecollection Error
I have sentinel-1 dataset and I want to map Frost filter function on each image in the dataset.
The problem is that when I try to do this. using map, I get the error:
Required argument (count) ...
0
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1answer
37 views
Masking out pixels from the Sentinel 1 image in Google Earth Engine
I am trying to classify paddy areas from time-series(in this case, four-date) Sentinel 1 image in both VH and VV polarization. Hence prior to classification, I need to mask out land covers such as ...
0
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1answer
32 views
Filtering Sentinel 1 Imagery
I'm working with Sentinel 1 radar imagery. For some images in the collection in parentheses next to the angle band the is a percentage (see image)
When I do some further steps in my analysis these ...
1
vote
1answer
53 views
Error generating chart: No features contain non-null values of “system:time_start”
I know there are many posts abbout this but for some reason those solutions doesn't work for my code.
I'm trying to create timeseries for an imagecollection which was created using image expressiones....
0
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1answer
38 views
Create loop that calculate new images from imagecollection based on different bands
I have imagecollection from sentinel 1 and I would like to create function that wil calculte new rasters based on a model that I have.
my imagecollection called FrostDB and I want to create new ...
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1answer
40 views
Pixel Location of Sentinel 1 & Sentinel 2 and SRTM
I am processing integration S1, S2 and SRTM, since their pixel grid does not align with each other I am figuring out how to snap with them all into one grid. Before coming with specific reprojection ...
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0answers
23 views
How to perform subset in Sentinel 1 slc data for PSInSAR processing?
I want to process sentinel 1 slc dataset for PSInSAR analysis.Currently, I am working on SNAP software and following this article
1: https://www.researchgate.net/publication/326655316_ESA_SNAP_-...
1
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2answers
38 views
Create loop that create new imagecollection based on calculation of previous imagecollection
I have imagecollection from sentinel which I would like to run few processes on it by using loop. I know what are the steps of the loop that I want and I have written draft that ia full of errores and ...
0
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3answers
282 views
Google Earth Engine with Folium and Sentinel-1 Plotting
I'm attempting to plot Google Earth Engine Sentinel-1 SAR data in a Jupyter notebook with Python and Folium. To do this I'm trying to combine two pieces of documentation:
EE Python Install -> Map ...
0
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1answer
125 views
How to solve “Collection query aborted after accumulating over 5000 elements”?
I am trying to sample image and to get scatter plot of its' two bands- NDVI and db from senttinel 1.
For some reason, probably because of the size of the shapefile, I get the error:
Error ...
2
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1answer
32 views
NormalizedDifference gives value of 0
I'm working with sentinel -1 image and i'm trying to compute NRPB equation as mention here:
I have applied Frost filter and then I tried to applly this normalized difference on one image only but for ...
2
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2answers
53 views
Add two bands to image gives the bands the same name
I have a sentinel -1 image collection and I have a function that suppose to use focal median in order to apply speckle correction. Each image has 2 bands: VV and VH and the function I have suppose to ...
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0answers
32 views
How to correct slight mismatch of Sentinel 1 GRDH and coastline shapefile?
I'm currently working on Sentinel 1 GRDH data with R (raster, rgdal, sp, rgeos, maptools ...). The geocoding of Sentinel data was made by the following command:
gdalwarp(srcfile=paste0(root,"...
1
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1answer
175 views
Calculating water occurrence of Sentinel-1 images in Google Earth Engine
I would like to derive the occurrence of surface water bodies from Sentinel-1 image collection in the Google Earth Engine.In my example I could already compute the water mask using Otsu’s method for ...
2
votes
1answer
137 views
Does Google Earth Engine have InSAR Processing Capabilities for Sentinel-1 data?
I am attempting to find an easier way to work with InSAR data (i.e. getting land movement data). I have worked with SARProz and SNAP in the past, but was recently made aware that GEE had Sentinel-1 ...
0
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1answer
41 views
Masking edges of S1 composite in Google Earth Engine
From the following code I would like to mask the edges of my sentinel 1 composites.
@Daniel provided the code.
var roi = Map.getBounds(true)
var startDate = ee.Date('2015-01-01')
var endDate = ee....
1
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1answer
96 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('...
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1answer
73 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
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1answer
38 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
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1answer
41 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
58 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 ...
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0answers
56 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
66 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
68 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
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0answers
21 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
58 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
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1answer
49 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
127 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
40 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
144 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
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1answer
147 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
54 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 ...
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1answer
48 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
45 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
53 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
57 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
99 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 ...
