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Questions tagged [sentinel-snap]

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

23 questions with no upvoted or accepted answers
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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 ...
3
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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
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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
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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
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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
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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.
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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
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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
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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
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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
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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
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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 ...
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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
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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 - ...
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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
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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 ...
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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
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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 ...
0
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0answers
15 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 ...
0
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0answers
190 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 ...
0
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0answers
70 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
66 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 ...
0
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1answer
25 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" ...