Questions tagged [sentinel-snap]
Snap is an open source software from ESA for the processing of remote sensing images
72
questions
28
votes
1answer
993 views
SNAP vs. GDAL vs. Orfeo - image rescale, histogram cut
I work with a Sentinel-2 .jp2 image (red band, 10950 x 10950 pixels). My aim is to reach the same result what SNAP does with a Python script. See the SNAP method and parameters:
So this is my ...
12
votes
4answers
1k views
Carrying out atmospheric correction on Sentinel-2 data from Amazon Web Services?
I'm wondering what the best method is for correcting Sentinel-2 images downloaded in JP2 format (from Amazon Web Services - AWS) to BOA reflectance? As the files downloaded from the sentinel scihub in ...
7
votes
2answers
7k views
Opening image files with Sentinel 2 toolbox
Anyone worked with the Sentinel-2 toolbox/SNAP? It doesn't support sentine-2 data to be opened directly. I tried opening .safe, .zip and .xml files.
6
votes
5answers
3k 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 ...
6
votes
1answer
2k 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 ...
5
votes
3answers
2k views
How to process Sentinel-2 data from AWS
Sentinel-2 imagery granules downloaded from AWS archives (http://sentinel-pds.s3-website.eu-central-1.amazonaws.com) have a little different data structure than the original granule sub-folders of ESA ...
5
votes
1answer
226 views
Understanding measurement units for MODIS data?
I am working on MODIS data in ESA SNAP, specifically the Terra sensor, and I'm having a hard time understanding the unit of measurement of the data provided.
I have downloaded Level 1B data (...
5
votes
1answer
2k views
Converting Sentinel-3 data (netcdf) to GeoTIFF?
I'm trying to convert Sentinel-3 data to GeoTiff file. The Sentinel-3 data comes as separate nc files (netcdf): a file for each spectral band and a nc file for qualityFlags, geo_coordinates etc' and ...
5
votes
1answer
2k views
Loading Sentinel 2 images downloaded with QGIS in SNAP software?
I have downloaded Sentinel 2 images using the semi-automatic classification plugin in QGIS, but I cannot open these files in SNAP software.
I can load .jp2 products in SNAP but I obtain a error when ...
5
votes
1answer
505 views
Sentinel 2 Tool Box on Commandline
Has anyone tried to use the Sentinel toolbox in command-line? I have downloaded the SNAP tool and installed on a Ubuntu workstation and the GUI works well. I now want to want to use it in a command-...
5
votes
2answers
1k views
Resolving Sentinel-1 Interferogram Unwrapping error when constructing DEM/DSM?
I have been trying to create a DSM of a coast and some islands, and have run into some issues regarding how the data looks in the unwrapped interferogram (which affects my height data). I have been ...
4
votes
1answer
4k views
get rgb images from sentinel-2 using gdal
i have some troubles to get RGB true colors image from sentinel satellite bands
wich produce this
to me it looks not natural at all
also i have tried gdal to do the merge with :
gdal_merge -o ...
4
votes
1answer
210 views
Understanding difference between collocation and coregistration?
I'm a little confused on this topic. I need to put 2 SAR images into same coordinate grid.
In ESA SNAP tool, there are 2 options:
coregistration: Radar->Coregistration->Coregistration
collocation: ...
3
votes
1answer
3k views
Apply cloud mask to sentinel 2 image in SNAP
I want to apply one of the cloud masks in the sentinel 2 file to the sentinel image.
The sentinel 2 image I have downloaded features files concerning cirrus and opaque clouds at 10m, 20m and 60m.
...
3
votes
1answer
1k views
Sentinel-2 mosaic (RGB bands) to a country
Is there a direct way to download a full coverage, actual (2017), cloudless, mosaic of Sentinel-2 satellite imagery to a whole country (with the size like Portugal) ?
If it isn't possible, then can ...
3
votes
3answers
3k 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? ...
3
votes
1answer
196 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 ...
3
votes
1answer
676 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 ...
3
votes
2answers
2k 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 ...
2
votes
2answers
3k views
How is Sentinel 2 MSI Natural Colours Profile in SNAP calculated
Using the ESA Toolbox named SNAP one can load a sentinel 2 data package and see a RGB view using the profile.
I am wondering what this profile in mathematical terms are.
Is it just information about ...
2
votes
1answer
202 views
Sentinel 2 Atmospheric Correction Inconsistencies
I'm having some peculiar issues with Sentinel 2 data. I've downloaded two coterminous tiles (one L1C tile from EarthExplorer and one L1C/L2A tile from AWS) taken at the same time and date. I have done ...
2
votes
1answer
562 views
Converting a netCDF4 file to (georeferenced) GeoTIFF, problems with georeferencing
Let's assume a netCDF4 (.nc) file downloaded from https://s5phub.copernicus.eu/dhus/odata/v1/Products('e6e91b26-ca43-43d4-9c08-c9c14dd6737e')/$value . This is sulphur dioxide measurement dataset over ...
2
votes
2answers
257 views
how to Replace masked out cloud areas with another satellite image?
I have a Sentinel 2 image which has heavy cloud cover. I would like to mask out the clouds, and replace these areas with a Landsat 8 image.
(1) How do I mask out cloud?
(2) how to I replace the ...
2
votes
1answer
2k views
Calibration error for Sentinel 1 image in SNAP toolbox
I am working with a Sentinel 1 SLC IW image (VV+VH) and trying to calibrate the data in the SNAP toolbox. However, it keeps returning the error "cannot construct data buffer"
Does anyone have any ...
2
votes
0answers
18 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 ...
2
votes
0answers
48 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
92 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
247 views
Problems with S3 georeferencing using Python-GDAL [closed]
I have to work with many Sentinel 2 and 3 images, with two different algorithms. I have to treat both images separately but only with Python and GDAL.
Concerning Sentinel-2 images, I download them on ...
2
votes
0answers
733 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 ...
2
votes
0answers
575 views
Calculating NDVI for Sentinel 2A, graph builder (SNAP)
While I am trying to calculate NDVI in graph builder, I get this error:
Can not convert "(B8-B4)/(B8+B4)" to double.
Target band type is: Float32 (it comes up automatically when I load the image.
1
vote
4answers
3k views
Remote sensing reflectance from Sentinel 2 in SNAP, ArcGIS or QGIS
I want to calculate "remote sensing reflectance" from Sentinel 2 image, which is derived from "water leaving radiance reflectance" of a water surface, to extract information of Total Suspended Matter ...
1
vote
1answer
736 views
Pixel value of Sentinel 2A L1C download
As I can read in many posts, it is necessary to convert Sentinel 2 L1C pixel values from Digital Count to TOA reflectance by dividing with the scaling factor.
However when I open my image in SNAP, ...
1
vote
1answer
139 views
Cloud masking using sen2cor
I already have the SNAP 7, and I can’t run sen2cor 2.08 directly from it. However, I can alternatively use the command prompt but it can only take the L1C images as input.
My problem now is that I ...
1
vote
1answer
129 views
Which version of Sen2Cor is used by the ESA?
I'm trying to find out which version of the Sen2Cor processor was used by the ESA to process a Sentinel L2A product for a specific date. The latest version is Sen2Cor v2.8 which was published this ...
1
vote
1answer
770 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:
...
1
vote
1answer
38 views
Sentinel-1 image backward
I have this problem with my images of the Ross Ice Shelf:
This is an image that has been Radar - Radiometric- Calibrate- Amplitude_HH - Gamma0
followed by Speckle Filter.
This is what happens when I ...
1
vote
1answer
784 views
Export Sentinal 2 TIFF image from SNAP with all the bands intact?
I have some Sentinal 2 data from which I need an image of a small area. How do I export that particular image with all the 13 bands intact to a TIFF image using SNAP? I can download 3 bands by viewing ...
1
vote
1answer
184 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
30 views
SNAP Upgrade Problems
Installed Sentinel Snap from official site on a Windows 10 virtual machine. Snap version 6.0.
Checked that I have administrative privileges before install, and asked to install "As an Administrator" ...
1
vote
1answer
1k views
Sentinel-2 files opening in SNAP
I see that others have problems similar to mine. Attempts to open Sentinel-2 data in SNAP by means of the *.xml file(s) fail.
When I pick the xml file from here, supposed to be metadata file,
the ...
1
vote
1answer
588 views
Sentinel 3 Land Surface Temperature
I am trying to derive Land Surface Temperature(LST) from Sentinel 3 SLSTR dataset. The given literature talks about split-window and dual angle algorithms - Link
Ts = Ti + c1(Ti- Tj) + c2 (Ti- Tj)2 +...
1
vote
1answer
307 views
Complex Coherence with SNAP or SarScape
is it possible to estimate the complex coherence between two RADARSAT-2 SLC images with SNAP or SarScape? If I try to estimate the Coherence I get only float data but I need it in a complex form.
1
vote
0answers
132 views
Processing Sentinel-3 SLSTR data using python via snappy API
I am trying to convert Sentinel-3 SLSTR S6 radiance data to a Geotiff file; However, I am finding converting the Sentinel-3 data which is in NCDF4 format to Geotiff format correctly very difficult. I ...
1
vote
0answers
112 views
Retrieve pixel value using SNAP-engine and Python for specific geographic coordinates
I'm trying to retrieve pixel values in Sentinel-3 data for specific geographic coordinates using the SNAP-Engine.
Until now, I transform the geographic coordinates to the corresponding X and Y with ...
1
vote
0answers
129 views
Can't import WKT polygon to SNAP
I have big size Sentinel-1 image and I would like to clip it to smaller size. For that i'm trying to import shapefile but I get errors all the time:
This is my polygon WKT:
PolygonZ ((102....
1
vote
0answers
78 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 ...
1
vote
0answers
421 views
Reprojection problem in SNAP (ESA)
I am trying to do a RBR (Relative Burn Ratio) and for this, I am using two Sentinel 2 L2A images (before and after the fire). The native CRS of the data is EPSG:32634 - WGS 84 / UTM zone 34N - ...
1
vote
0answers
383 views
Apply Orbit File in snap for PALSAR 2 data
I am using snap software for PALSAR 2 data. Thinking of orbit correction using the Apply Orbit File in the radar tool. But in the processing parameter, under the Orbit State Vectors we do not have any ...
1
vote
0answers
200 views
Is there a significant difference in results between working with QGIS vs. SNAP? [closed]
I need to work with Sentinel-2 data, and I have been having difficult with the ESA toolbox (SNAP), so I've decided to process the imagery with QGIS instead.
My question is, is there a significant ...
1
vote
0answers
873 views
Getting local incidence angle map from SAR-Imagery?
I have a dual pol TanDEM-X imagery with a bi-static acquisition mode. To calculate the vertical wavenumber, I need a local incidence angle map of the Master and Slave image. As a first step I co-...
