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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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1answer
61 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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1answer
68 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
118 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
254 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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0answers
12 views

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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0answers
100 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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0answers
26 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
119 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
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0answers
33 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
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0answers
37 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
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0answers
85 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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0answers
57 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 ...
0
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1answer
40 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
94 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 ...
1
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1answer
307 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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0answers
115 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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0answers
29 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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0answers
35 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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0answers
315 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 ...
0
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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" ...
4
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1answer
127 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 (...
0
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1answer
438 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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0answers
203 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 ...
0
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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. ...
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0answers
480 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 ...
3
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1answer
804 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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0answers
142 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 ...
2
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1answer
942 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 ...
1
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1answer
562 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
409 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 ...
2
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2answers
204 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 ...
3
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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
459 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 +...
3
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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. ...
5
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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 ...
10
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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 ...
2
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0answers
480 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.
5
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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
566 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-...
5
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2answers
985 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 ...
1
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1answer
216 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.
2
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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? ...
2
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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 ...
5
votes
1answer
460 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-...
7
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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.
2
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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 ...