Questions tagged [sentinel-snap]

Snap is an open source software from ESA for the processing of remote sensing images

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51 views

Seeking Sentinel L1C images (.SAFE) from 2015-2019 since no longer available on Copernicus Open Access Hub

I am looking for Sentinel images from before 2019 in L1C quality and .SAFE format, as I want to correct them with sen2cor in SNAP to convert them to L2A quality. Where can I find them now that they ...
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1answer
958 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 ...
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1answer
194 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: ...
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69 views

snaphu export error using snap

I used SNAP sentinel 1 to calculate subsidence. After snaphu export I open snaphu.conf and copy command as below then run it in Terminal. I got the following error in picture:
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12 views

SNAP Sen2cor Correction

While applying sen2cor correction in SNAP on sentinel-2 L1c product i receive this error "cannot find L2A data strip directory" how i solve this error
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16 views

SNAP Multi-size Mosaic problem

I am trying to mosaic 3 S2 L1C images. I used the multi-size mosaic to prevent resampling as preprocess for the mosaic-only. However the resulting image has 0 values. This is the result: Since S2 ...
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1answer
32 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 ...
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9 views

High resolution LST band source

I've already used Sentinel-2 images with the resolution of 10m/pxl for urban heat island analysis. Now I need higher resolution image (1 to 5m per pixel) for Ekaterinburg in Russia. Searching in the ...
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23 views

The extraction of the Sentinel-1 backscattering coefficient

I want to do some calculations with the backscatter coefficient of the Sentinel-1 satellite. Do I need to filter the raw data(using mean or sigma Lee) on GEE?
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1answer
51 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_-...
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1answer
604 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 ...
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28 views

How to write natural logarithm in SNAP software

I want to compute the temperature of a band using the equation: where L(6) is Band 6 of a Raster file and K1 and K2 are constant. I am using Band Math to perform conversions. However I could not find ...
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1answer
110 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 ...
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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 ...
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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 ...
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1answer
20 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 ...
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94 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 ...
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0answers
82 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 ...
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1answer
116 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 ...
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13 views

Sentinel 2 Conversion Relectance to Radiance?

Sentinel 2a level 2 digital number is a surface BOA reflectance. I want to convert this number to radiance, how should I do it? I use ArcGIS or Snap (there is reflectance to radiance but it requires ...
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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" ...
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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 ...
6
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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 ...
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2answers
1k 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 ...
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1answer
540 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 ...
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3answers
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
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1answer
174 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 ...
5
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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 ...
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0answers
109 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....
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50 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 ...
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1answer
47 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 ...
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1answer
121 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 ...
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63 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 ...
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1answer
307 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 ...
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0answers
344 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 - ...
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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. ...
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1answer
124 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 ...
5
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1answer
216 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 (...
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103 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, ...
5
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1answer
502 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-...
2
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1answer
183 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 ...
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0answers
605 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 ...
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1answer
493 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 ...
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0answers
88 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 ...
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0answers
46 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 ...
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1answer
684 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: ...
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87 views

Producing cloud and cloud shadow mask from Sentinel images?

What is a good tool to produce (cloud) and cloud shadow masks? I tried fmask tool and Sentinel SNAP but while those can produce reasonable cloud masks, cloud shadow results are poor. I need to ...
2
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0answers
670 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
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0answers
233 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 ...
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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 ...