Questions tagged [sentinel-snap]
Snap is an open source software from ESA for the processing of remote sensing images
55
questions
22
votes
0answers
622 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 ...
10
votes
3answers
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
6k 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.
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
166 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
1k 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
480 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
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 ...
3
votes
1answer
2k 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
933 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
1answer
3k 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 ...
3
votes
1answer
1k 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 ...
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? ...
3
votes
1answer
249 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
0answers
128 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: ...
2
votes
2answers
2k 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
109 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
2answers
226 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
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 ...
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
518 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
1answer
487 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
345 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 ...
1
vote
1answer
590 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 ...
1
vote
1answer
403 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
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
211 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 ...
1
vote
1answer
787 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
501 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
258 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
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 ...
1
vote
1answer
20 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
0answers
152 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 ...
1
vote
0answers
386 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 ...
1
vote
0answers
276 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
162 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
670 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-...
0
votes
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 ...
0
votes
1answer
585 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
1answer
61 views
Sentinel-2 L2A cloud masking
I have a Sentinel-2 L2A image downloaded from the Scihub.copernicus website.This image has clouds that muddle the classification. Thus, I want to remove them using sen2cor and SNAP. Is there any ...
0
votes
1answer
2k views
sen2cor 2.4.0 on SNAP 6.0
Apparently, the new released SNAP 6.0 allows the sen2cor plugin to be installed and run directly within the SNAP. Indeed, SNAP installs the bundle when try to run it.
However, it doesn't work for me. ...
0
votes
1answer
19 views
Generate LULC maps using Sentinel data of European Space Agency?
I found out that Sentinel data is of 10m x 10m resolution whereas LANDSAT data is of 30m x 30m resolution. Did anyone come across research in which Sentinel data is used for making LULC maps or is ...
0
votes
0answers
35 views
Soil moisture from Sentinel data
How should I interpret backscater coefficient of SAR data from Sentinel 1 to soil moisture percentage, as I am getting values between 0 and 1 and I am calculating for different seasons without any ...
0
votes
0answers
50 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 - ...
0
votes
0answers
31 views
Atmospheric correction of InSAR interefrograms
I am trying to apply GACOS service to correct atmospheric artifacts on InSAR interferogram.
In the GACOS manual provided with the GACOS_Ultility example, it is mentioned that data storage of the ...
0
votes
1answer
42 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 ...
0
votes
0answers
43 views
sen2cor BOA output
I have installed all of the necessary programs for this process (Anaconda, Step SNAP, Sen2cor, etc). I have installed the plugin for sen2cor in SNAP.
When I run the Level1-c product through Sen2cor, ...
0
votes
0answers
237 views
Binary Raster (numpy array) to shapefile
i did a classification with a min/max threshold for stormdamaged areas. For that i calculated two indices (NSDVI) and (SAVI). I intersected two numpy arrays from those results. I recieve a binary ...
