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Questions tagged [sentinel-2]

Remote sensing satellites with Multispectral imaging capabilities

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3 views

Make Level-2 Landsat images comparable with Level-2A Sentinel-2 images

Is there a way to make Level-2 Landsat images (e.g. Landsat-5 images ordered from EarthExplorer) comparable with Level-2A Sentinel-2 images? The objective is to calculate water or vegetation indices (...
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2answers
24 views

Google Engine - Make a greenest pixel composite for Sentinel 2

Does anyone know how to do a composite of greenest pixel for Sentinel 2? That is calculate the maximum NDVI for a Image collection, and then do a pixel-wise image stacking of the original bands (...
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1answer
23 views

Gdal not open Sentinel 2A

What is the problem with gdal info for sentinel 2 level 2A? gdalinfo SENTINEL2_L2A:S2A_MSIL2A_20181227T125301_N0211_R052_T24LXN_20181227T145100.SAFE/MTD_MSIL2A.xml ERROR 1: Invalid syntax for ...
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30 views

Sentinel 2 imagery does not align with Landsat imagery regardless of coordinate system

I have downloaded Sentinel 2 imagery of Antarctica and imported it into a QGIS project that also contains older Landsat imagery, line vectors, and a basic basemap. The Sentinel 2 imagery was ...
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3answers
54 views

Bare Soil Detection

I try to find bare soil areas. Those which are bare over the whole year and those which are fresh harvest and remain bare over a certain time. I try to do this with sentinel-2 data. But the Problem is ...
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1answer
23 views

Why are there black regions on sentinel data?

I'm a novice. I'm querying https://scihub.copernicus.eu/dhus with the following: footprint:"Intersects(POLYGON((-49.6205 -22.0966,-49.6222 -22.1122,-49.6028 -22.1079,-49.5845 -22.1123,-49.5865 -22....
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1answer
40 views

problem with sentinel-2 NDVI export to TIFF in Google Earth Engine

I'm trying to calculate and export NDVI rasters extracted from Sentinel-2 using the script: https://code.earthengine.google.com/a9247db3f03e9514eb0378d1f59e9447 Source code: Export images in google ...
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1answer
38 views

Create animation of NDVI from ImageCollection in GEE

I'm trying to make an animation of NDVI images from sentinel collection in order to see clearly variance in the field. The first part of the code works with little error: "Layer name is not a string: ...
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23 views

Why are there holes in the resulting map of median reflectance values from Sentinel2 imagery on GEE?

I don not understand why are there holes in the resulting map of median reflectance values from S2 imagery on GEE and how do I fix it? Also, why are all the clouds not getting masked? //Function for ...
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22 views

How to select max and min values of NDVI of a particular plant species and make a Chart in Earth Engine?

I am trying to calculate NDVI of a region and trying to make NDVI chart of it. I got results for that work. I am facing a challenge to extract the NDVI values of particular species(eg:wheat) within a ...
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1answer
61 views

Make a Loop for Monthly NDVI in Google Earth Engine?

I've computed maximum NDVI for each month. but I don't know how can I write this code through a loop in Google Earth Engine? code link: https://code.earthengine.google.com/...
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1answer
40 views

Earth Engine: nearly identical Sentinel 2 images for same date, same place?

I am using Earth Engine to retrieve Sentinel 2 data. I thought that for a given date and place, I would find only one Sentinel image (revisit time is multiple days). I notice however that for some ...
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2answers
66 views

Filtering Sentinel2 image collection to get least cloudy image for entire ROI

I am trying to obtain the least cloudy image (or images) across my entire ROI. Though I do not get any errors, the true color composite is not being mapped for me to check if I have indeed sorted and ...
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1answer
39 views

Can I use a greenest pixel or a no clouds Sentinel 2 for NDVI analysis?

Can I use a greenest pixel or a no clouds Sentinel 2 for NDVI analysis? I want to use it for extract spectral signature. And now that I´m asking about it, I want to know if I can work classification ...
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1answer
44 views

Extraction of Cloud Coverage percentages of Sentinel 2 images

I have to download S2A images over a large area from 2016 March to 2019 January. Before start downloading data, first I want to know cloud coverage percentages of all the images over this period. Is ...
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1answer
60 views

Computation Timed out error when creating a cloud-free composite of Sentinel-2

I am trying to create a cloud free-composite that covers my ENTIRE study area using Sentinel-2 data. But, everytime I run this code, I get a Computation Timed out error. I am simply loading an image ...
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27 views

Why do I get different values in QGIS while calculating EVI for Sentinel2 images?

In my thesis I investigate vegetation change in Hungary. I downloaded some Sentinel 2 images from: https://scihub.copernicus.eu/dhus/#/home I used L1C and L2A pictures. During my work I transformed ...
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2answers
37 views

QGIS reading Sentinel 2 image .zip gives error?

I have a very primitive question. The sentinel-2 .zip tiles downloaded from Copernicus Open access Hub are being recognized and opened with STEP SNAP toolbox (obviously)! However this is not ...
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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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1answer
28 views

Exporting vector from raster classification gives deformed vector in Google Earth Engine?

I am very new with Google Earth Engine and I try to make a landcover classification using Sentinel-2 imagery to get the urban area over a very large area (country wide ideally). I was able to ...
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46 views

How to convert image to function

How can I can convert an output from ee.image to a function for input in sort. At first I sort for cloud free Sentinel 2 pictures, this part of the code works fine: var filterdCloud = ee.Image(Time....
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31 views

Function to remove borders and clouds from SENTINEL2

I've been trying to test SENTINEL, and found some functions to clean the clouds and edges of the images, but I do not understand exactly how this function works, and I'm very curious to understand ...
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1answer
16 views

Reducing images to list and array size mismatch

I want to convert a google earth image to a numpy array and use Google Earth Engine's Reducer.toList operation. But the size of array I get is different than the size of image as I see in image ...
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1answer
36 views

What are the other bits in Sentinel's QA60 band?

According to this page on Google Earth Engine documentation bit 10 is 1 for dense clouds, and bit 11 is 1 for cirrus. The documentation doesn't say anything about all the other 14 bits that can be set,...
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1answer
38 views

Clipping multi-band Sentinel-2 composites in ArcMap?

I am using Sentinel-2 images and I want to clip the image with a shapefile I made. (The shapefile was smoothed with Smooth polygon with a 10m PAEK tolerance). I have tried the Raster clip tool and ...
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0answers
56 views

Questionable data on single channel satellite bands vs. RGB composites

I am using Sentinel-2 images for a given region. I have all the separate bands and a merged RGB file, which comes standard with a download from ESA's API. Now I'm running some code where I separate ...
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1answer
51 views

How to extract values from metadata in sentinel 2 images

I am trying to composite an image with the mean value of the METADATA layer "CLOUDY_PIXEL_PERCENTAGE" for every pixel. My goal is to do this for monthly mean values, but I can't find the way to ...
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1answer
185 views

Data smoothing of Sentinel-2 NDVI time series chart in Google Earth Engine?

I am exploring Sentinel-2 time-series NDVI with Google Earth Engine. In another post I learned how to plot a NDVI time series chart. I know that there are many smoothing methods for reducing NDVI ...
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1answer
83 views

Cloudfree images in small area from Sentinel-2

I have a similar question to this one here: Filter Landsat images base on cloud cover over a region of interest Different from the linked question I would like to find a more general solution that is ...
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0answers
34 views

Issues calculating RedEdge indices from Sentinel 2 Data

I have calculated NDVIre3 from Sentinel 2A MS data in QGIS. As a pre-processing step, the Sentinel 2 bands (L1C product) were corrected using DOS1 algorithm available in QGIS 3.4.1 SCP plugin. The ...
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1answer
74 views

Download and Browse Sentinel data from AWS

It's been a while since I downloaded or browsed Sentinel data in AWS from http://sentinel-s2-l1c.s3-website.eu-central-1.amazonaws.com/tiles/ But I can not access this website anymore. Is it closed ...
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51 views

How to detect cloud's shadows with Sentinel2/SentinelHub?

I'm trying to detect clouds and their shadows on Sentinel2 images with SentinelHub service. For clouds detection, SentinelHub team has developed a good tool but I would like to detect cloud's shadow ...
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0answers
82 views

gdal_translate Resample different min max values

I tried to resample a Sentinel2 GeoTiff with a 20m resolution to 10m resolution using gdal_translate: result = gdal.Translate(outFile,resampleBandPath,format="GTiff",width=10980,height=10980,...
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0answers
170 views

Sentinel 2 preprocessing with R

I need to transform Sentinel 2 L1C imagery to preprocessed Level 2A data. Ideally this should happen in R, as the remaining processing stack is already done in R. Are there ready preprocessing ...
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1answer
132 views

Rasterio showing single band images wrong

I'm using rasterio in Python at the moment, and I have no problem when I'm dealing with RGB satellite images. However, if I try using singleband Sentinel 2 images, or a singleband Sentinel 1 image, ...
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2answers
53 views

How to get latest picture of my city from sentinel 2?

I was trying to get latest picture of my city from Sentinel 2, but had no success. I have registered on Copernicus website, found my city and drew a square around it. Then I clicked the "search" icon, ...
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1answer
33 views

Stripes between 2 images of Sentinel 2A (Level-1C)

Why do i get these stripes between 2 images of Sentinel 2A? (Figure) I notice that this happened for 2 images of different sensing date (even they're just 3 days away). Has anyone had this ...
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1answer
59 views

Performing Supervised Classification on Sentinel Image using ArcGIS Desktop?

Is it possible to perform supervised classification on Sentinel Satellite Image with the minimum error. I compared two raster, one being the manual classification of an area using Photoshop CS6 and ...
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1answer
659 views

Creating Sentinel-2 NDVI time series chart in Google Earth Engine?

I am exploring Sentinel-2 time-series NDVI with Google Earth Engine. In another post (here) I calculated and exported NDVI values from Sentinel-2. Now I would like to create a NDVI time series chart, ...
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1answer
47 views

Get a list of all the images that match the conditions in Google Earth Engine (not only the first)?

Normally when I run this code I get the least cloudy image but I want to know what the other images are. I use this code: var image = ee.ImageCollection('COPERNICUS/S2') .filterBounds(...
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1answer
181 views

GEE. : Exported bands must have compatible data types; found inconsistent types: UInt16 and UInt32

What are the possible reasons for this error? This is the code: Map.addLayer(PuntoQuellaveco1); Map.addLayer(operaciones); Map.addLayer(Abast); var image = ee.ImageCollection('COPERNICUS/S2') ....
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1answer
113 views

Search Sentinel-2 images using python api

Based on the documentation here, I wrote the following script: from sentinelsat import SentinelAPI, read_geojson, geojson_to_wkt from datetime import date api = SentinelAPI('user name', 'password', '...
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1answer
39 views

Filter sentinel 2 images that have empty areas

When trying to download a clipped area from the sentinelhub API python library, it returns images from 2 different orbits: One that passes right on top (Right pic), and the image is full, and a orbit ...
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1answer
203 views

GEE Export.image.toDrive output not matching bounding box?

I am new to GEE and javascript. Copy-pasting here and there, I managed to put together this code that extracts NDVI from cloud-free Sentinel-2 images on GEE. I created a fusion table from a KML with ...
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1answer
71 views

Fmask 4.0 on Sentinel data from Sinergise/AWS

I have downloaded Sentinel data from the AWS bucket on S3. How can I place this into the appropriate SAFE folder structure to run the Fmask cloud masking software (https://github.com/GERSL/Fmask)?
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1answer
91 views

Making subset of Sentinel-2 with rasterio?

I am looking for a solution to my problem with rasterio. I want to download just a specific part of the image from AWS based on lat lon coordinates. Rasterio offers a great tool (window) although it ...
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0answers
601 views

Earth Engine Sentinel-2 atmospheric correction

I want to run some time series analysis on sentinel-2 data in EE for my master thesis. However the algorithms for Sen-2 in EE are scarce. The biggest issue is that there isn't any for atmospheric ...
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1answer
48 views

Sentinel-2 Query scihub apihub wget missunbg results

when I perform a search using https://[username]:[password]@scihub.copernicus.eu:443/dhus/search?q=footprint:"intersects(41.9000, 12.5000)" AND ((platformname:Sentinel-2)) in firefox I only get to see ...
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0answers
38 views

Color different of two Sentinel 2A (L1C) images from the same sensing date

i'm new to this GIS Q&A websites and remote sensing as well, so sorry for this too basic question. It's about my Sentinel 2 (Level-1C) images. I downloaded 2 images with the same sensing date (09-...
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2answers
312 views

Google Earth Engine API: How to select an image from an image collection based on NDVI value?

I want to select the image with lowest median NDVI to represent bare ground cover from Sentinel-2 image collection for my region of interest (<5% cloud). I have a boundary file pre-loaded on ...