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Questions tagged [sentinel-snap]

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

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Mosaic 2 images Sentinel 2 [on hold]

I have a problem with the mosaic of 2 images from the Sentinel 2. Why does the pixel size change to the final product? When compared to the original image, the pixels are different, missing, or an ...
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1answer
47 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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67 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
128 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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SNAP: Missing intensity band

I'm using SNAP to create and interferogram. The images are S1A and S1B_IW_SLC_1SDV. After splitting the images I try to apply Radiometric Calibration as the Sentinel images are from 2016. However, it ...
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50 views

Blank Image After Terrain Correction

I am new to snap. I have downloaded sentinel 1 image from ESA. I have performed radiometric cal-liberation as well as speckle filtering. After that, when I tried to perform terrain correction, the ...
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21 views

Extracting land and cloud masks as individual files from Sentinel-2 images

How can I produce land and cloud masks from Sentinel-2 images? I've tried using Sentinel SNAP to produce them (using the 'idex' tool), but not sure how to extract the two individually as a single ...
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1answer
97 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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27 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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32 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
69 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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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 ...
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1answer
37 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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166 views

How to Increase snappy memory in ESA SNAP?

I encountered with some error in SNAP provided by ESA on Windows 10 (64-bit) with 8GB RAM, like can not construct data buffer. After some research, I came to know its the problem of RAM availability ...
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78 views

Sentinel-1 SNAP toolbox image view does not export as Geotiff i.e with spatial reference

I have a source image (S1) in WGS 84 UTM 24 N projection. The source image is used for a segmentation analysis. Using the k-means segmentation process, the source image is segmented and outputted as a ...
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1answer
248 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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95 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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28 views

Processing georeferenced RISAT dataset in SNAP toolbox

I am working on SAR datasets, building a calibration software in python. I need to be able to get the data in the vertical and horizontal alignment as the Sentinel-1 datasets are. However it turns out ...
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32 views

Water contamination assessment in SNAP using sentinel-2 images

I recently started using SNAP. I need help with assessment of the current water contamination crisis in Gdansk, Poland. On 15.05 the local sewage pumping station broke and started pumping sewage ...
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290 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 ...
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16 views

SNAP Sentinel update files

I have 2 computers and a mobile carrier internet connection wich is very expensive. I have installed Sentinel Snap application on both computers and updated the application on one of them. Now, I ...
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1answer
16 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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1answer
119 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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1answer
384 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) ...
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185 views

SAR processing in SNAP

I am new to both S1 images and SNAP tool box. Trying to extract surface water body by using S1 images in SNAP tool. Followed the below link http://www.un-spider.org/advisory-support/recommended-...
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170 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 ...
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1answer
1k 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. ...
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436 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
750 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 ...
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128 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 ...
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1answer
827 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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1answer
449 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 ...
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1answer
367 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, ...
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4answers
2k 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 ...
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4answers
1k views

Is there a 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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2answers
186 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 ...
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1answer
2k 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 ...
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1answer
441 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 +...
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1answer
1k 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
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 ...
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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 ...
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0answers
439 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.
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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 ...
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0answers
535 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-...
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2answers
971 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 ...
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1answer
199 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.
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1answer
1k 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? ...
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1answer
1k 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 ...
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1answer
456 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-...
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2answers
5k 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.