Questions tagged [cloud-cover]

in this context cloud cover refers to the fraction of a remote sensing image obscured by clouds. Do not use for questions related to cloud services.

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Filtering Sentinel2 image collection by cloud coverage over specific polygon

I am pretty new to GEE. My task is to get all Sentinel 2 images from a specific time. Then I want to filter this collection by a maximum cloud coverage over an area of interest, which is imported ...
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1answer
27 views

How can I get the image with less cloud coverage over a ROI in a time range with Sentinel 2?

I am trying to compute a script to get the cleanest image of Sentinel 2 in a prescribed time range. Currently I tried with 2 approaches: a rough one and an automatic one, but I get two different ...
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1answer
36 views

Google Earth Engine updatemask removes Metadata

I'm using the Jupyter Notebooks Python GEE API. I'm using the basic sentinel 2 cloud cover algorithm, maskS2cloud, from the catalogue example. But it removes the metadata from my image collection that ...
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1answer
42 views

Bitwise and bitmask used in mask clouds Sentinel-2 images

What is the function behind two specific line in below coding block ... 1) var cloudBitMask = 1 << 10; 2) var mask = qa.bitwiseAnd(cloudBitMask).eq(0) .and(qa.bitwiseAnd(cirrusBitMask).eq(0)); ...
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2answers
153 views

How to retrieve Sentinel images without significant cloud coverage using Python

Background I am trying to retrieve images of certain areas. My aim is to get images without much cloud on them. I would like to specify the percentage of pixels with clouds on them. What I am doing ...
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6 views

Raster sampling: Extracting values from multiband-raster only if no clouds at the sampling points acc. to the Quality-bit-layer (QAI) QGIS 3, Win10

I'd like to extract band values at given points out of a timeseries of tiled Sentinel2-derived 10-band-gtiffs with bottom-of-atmosphere reflectance information (BOA). On the whole there are 6 tiles, ...
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1answer
51 views

Filter Landsat 5 Surface Reflectance Images by Cloud Cover with a Region of Interest in GEE

I'd like to filter a large collection of Landsat 5 Surface Reflectance images by cloud cover within a small region of interest (not the entire image scene) in Google Earth Engine. I know there are ...
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5 views

Cloud and shadow detection for land use classification using rgb + B8 and B11+B12 of the sentinel satellite with a time series

I was wondering if there was a standard approach to detect clouds, snow and other such anomalies using the rgb B8 and B11+B12 data. Most of the approaches I have found such as Sentinel2Cloud also make ...
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1answer
126 views

How to filter Open Data Cube satellite data by cloud coverage similar to the Sentinel API?

I'm planning to use Sentinel API for a small region and have a time-space dataset filtered out by a cloud coverage percentage. Does someone know if I can do the same with Open Data Cube? i.e. when ...
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1answer
32 views

Problem while cloud masking in MCD19A2.006 data

I need to create a time series of aerosol optical depth using MCD19A2.006 data. I used the 'AOD_QA' band for masking the cloud. However, the following code is not working. If someone could assist me ...
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78 views

Remove cloud cover and calculate EVI in Sentinel-2 2a by GEE

I am trying to calculate EVI by GEE for every 15 days for two years. I have put the code to remove the cloud mask and wondering if my code is right? // Lists of Years and Months var startDate = '2018-...
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1answer
52 views

How can I create a 10 day composite image of the snow cover extent using QGIS?

I have 10 singleband rasters of the snow cover extent (1 raster/day from 1st of December to 10th of December). I have to create a composite image that merges all of them. I tried the r.composite tool ...
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1answer
69 views

Limiting cloud estimation of Landsat8_SR over ROI in GEE

I intend to create an image collection of Landsat-8 surface reflectance not TOA that has 100% free cloud over my Region of Interest (ROI). Not surprisingly the code I have found in the forum ( Filter ...
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0answers
157 views

Sentinel-2 clouds filtering in GEE

I need to filter a Sentinel-2 image collection in order to have almost no clouds. I used the following code: //Dates of interest var START = ee.Date('2017-03-28'); var FINISH = ee.Date('2020-07-31'); ...
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1answer
194 views

How can filter low cloud coverange in a region with Sentinel-2 L2A in GEE?

I'm trying to filter clouds in Sentinel-2 through GEE in a ROI but I get the same number of images clipping or not clipping the geometry. How can I calculate the cloud coverage in a ROI and filter an ...
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1answer
154 views

Fulfilling removed cloud area with free cloud data in Google Earth Engine

I have completed doing cloud removal with Landsat image (in this case is Lansat 8) in the Google Earth Engine. Of course the result of this process is the cloud pixels become no data, consequently the ...
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1answer
52 views

Combining single cloud-masked images using Google Earth Engine

I am trying to calculate the mean pixel values of three Sentinel-2 images, all of which I have cloud masked separately. They all have small areas of cloud but in different places. I assumed that when ...
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1answer
154 views

Filtering clouds from average in Google Earth Engine

I am filtering a Sentinel-2 collection with the goal of producing an average over a period of three months. I have selected three images within the collection with which to do this. They all have some ...
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1answer
116 views

Descartes Labs Platform scenes.search within less cloudy periods

Sometimes searching for scenes over a large date range is necessary to obtain cloud-free images, but can be prohibitively slow for satellites with high revisit rates (e.g. Sentinel-2). Is there a ...
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2answers
202 views

GEE error code while exporting Sentinel-2 cloud masked image

I have filtered a Sentinel-2 image and created a cloud mask for it based on its QA60 band. It works fine and displays with this mask applied. However, when I try to export it to a drive, I get the ...
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1answer
144 views

Cloud masking with the Descartes Labs Platform Scenes API

I have created a scene collection in the Descartes Labs Platform using the Scenes search function (dl.scenes.search) for my area of interest and sensor of choice (Sentinel-2). I would like to iterate ...
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1answer
136 views

Image (band) interpolation

I have a set of sentinel 2A images. I eliminated those that contained too many clouds, and then I created a cloud mask using cloud probabilities and Otsu thresholding method to eliminate cloudy pixels ...
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1answer
163 views

Landsat 8 extracted pixel values for up North: 'pixel_qa' value of 322

I am trying to get landsat reflectance values corresponding to field plots spread all over Finland using the Google Earth Engine. As you know, Finland is up North, between latitudes of ~60 and 70 ...
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1answer
164 views

Using the pixel quality layers of the Landsat SR products to create cloud and water masks in R

I tried to use the RStoolbox package function classifyQA to generate information on quality of the layers of interest, namely - cloud, cloud shadows, and water. I am unable to understand how to mask ...
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1answer
867 views

Counting number of unmasked pixels per image in collection using Google Earth Engine

I'm trying to count the number of pixels that are masked by the cloud mask of the image collection given by the Earth Engine dataset. I have clipped my collection with a ROI and now I want to keep the ...
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0answers
26 views

Cloud masking Rapid Eye images

I am trying to delete clouds (ideally also their shadows) from Rapid Eye images (5 bands; blue, green, red, red edge, near-infrared). I have tried to set a threshold for the red band and mask ...
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0answers
64 views

Cloud Shadow interferring with NDWI Analysis

I'm working on surface water identification in Northern Kenya. I'm using Landsat 5TM and Landsat 8OLI data in ENVI 5. I've masked clouds using the QA band (although have also tried the fmask tool- ...
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1answer
87 views

ENVI fmask Error for Landsat 5 data

I'm trying to mask cloud cover of multi-spectral Landsat 5 image containing bands 1-7 that have been preprocessed using dark object subtraction and Landsat calibration. I am using the fmask tool in ...
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1answer
260 views

Earth Engine modis QA and charting

I have to mask all the cloudy pixels, and because the QA info is stored in bits I am trying to decode them using this code. However when I chart the masked timeseries, I get an error: Error generating ...
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1answer
420 views

Atmospheric correction of larger collection of Sentinel 2 L1C images (in Google Earth Engine) for NDVI time series

System: Windows 10 Software: Google Earth Engine browser, (QGIS, SNAP) Data: Sentinel 2 L1C & L2A, NDVI calculations I'm currently working on generating a NDVI timeseries in Google Earth Engine ...
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2answers
472 views

Python fmask from command line or in Python script

I'd like to mask some clouds in Sentinel-2-Images with the python-fmask-library. As I'm not too experienced with Python and remote sensing, I have some questions. When I installed the library I ...
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1answer
623 views

Cloud cover percentage in Google Earth Engine for Sentinel-2

I'm trying to obtain the cloud cover percentage of my ROI in a specific time interval using Sentinel-2. //Sentinel collection var sentinel2 = ee.ImageCollection("COPERNICUS/S2") .filterBounds(ROI) ....
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1answer
1k views

Creating Cloud free images out of a MOD09A1 MODIS image in GEE?

How can I mask clouds in a MODIS\MOD09A1 images in GEE? I know I should do sth with the "Bitmask for QA", but how? var myImgCln = ee.ImageCollection("MODIS/006/MOD09A1") .filterMetadata(???
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1answer
105 views

using handset 8, remove snow and use less cloud Landsat image

I want to take out snow and use a less cloud Landsat image. I am not sure the code from var image.... I think this is the right order (filterData, sort, median and map) but it does not work. ...
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1answer
2k views

Filter and show images from an imageCollection in Google Earth Engine

once filtered an imageCollection in Google Earth Engine, how can I add as layers the images resulting by the filter process? I need to show all the images (S2_L2A) available for a specific point (I'...
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1answer
197 views

Cloud mask for worldview

I'm using worldview imagery downloaded from gbdx and I want to apply cloud mask for it. It's preferable to use ready-made layer or some python module/tool to create it. The demand for the method ...
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0answers
145 views

Google Earth Engine: Prevent Cloud mask algorithm for Landsat-8 from removing coastline lines

I'm a new Google Earth Engine user an I am trying to remove clouds on Landsat image using cloud mask. However, the cloud mask removes even the shoreline lines, not the clouds. I don't know why. Is ...
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32 views

Landsat 8 Cloud Cover [duplicate]

I downloaded Landsat 8 imagery from Earth Explorer for a particular area. I tried to get it with no cloud cover, but it did not show any results. The least amount of cloud cover that I could get was ...
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1answer
255 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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55 views

Create a Cloud Free Image, using BQA

I am trying to create a cloud free image to use in the unsupervised classification, however my final product ("composite collection without cloud") stays with stranger stains and it seems to influence ...
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1answer
567 views

Remove Cloud Cover with Python Earth Engine API

I am attempting to use google's cloudscore methodology to remove clouds from LANDSAT8 imagery. I am using python to do this. I can get this to work in java from the web code editor, but am unable to ...
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0answers
32 views

ArcMap cloud removal process

I am working with Landsat 8 data. I have performed the necessary pre-processes that I want (atmospheric and topographic correction and pan-sharpening, using QGIS and ERDAS). I am now working on ...
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1answer
412 views

Overlapping multiple images with cloud masked?

I am now using fmask algorithm to eliminate the cloud covered areas on Landsat images. I choose a period of time (Jan 1st 2017 to Dec 31st 2017), and selected the study area (Florida). I want to get ...
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0answers
83 views

Is there a way to interpolate lost data/lost pixels caused by cloud and cloud shadow masks in Google Earth Engine? [duplicate]

I'm sure cloud and cloud shadows have been, time and time again, a frustrating problem. Usually after masking the two, I composite multiple images (in a set time interval e.g. 2015-2016, months 6-8) ...
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1answer
149 views

Landsat 8 cloud band: how to understand their (bit) coding?

I am trying to understand how to use the Lansdat 8 cloud quality band. The user guide L8_Surface-Reflectance-Code-LASRC-Product-Guide.pdf does not explain much, but just gives tables (Table 7-1, 7-2 ...
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1answer
85 views

How can I set multiple values to null in one raster and replace all other values with another raster?

I am working with Landsat8 cloud data (BQA.tiff). I would like to set all medium and high confidence cloud/cloud shadow values (values listed below) to null and replace all other values in this image ...
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1answer
1k views

What is the difference between .filterMetadata(), ee.Filter.lte() and .sort() in google earth engine?

I am currently trying to obtain images that have less than 70% cloud cover (for example) and I have come across multiple variations of the same. Could you tell me what is the difference between these ...
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1answer
648 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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0answers
222 views

Calculate cloud free median value for landsat 5, 7, 8 image collections in GoogleEarthEngine

I have an image collection of Landsat 5, Landsat 7 and Landsat 8 images. I want to calculate the median value of my image collection. Before that I want to exclude all cloudy pixels of my collection, ...
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2answers
363 views

maskClouds vs filter clouds on Google Earth Engine

On Lab 6: Time series analysis from https://developers.google.com/earth-engine/edu, there is maskClouds: var maskClouds = function(image) { var quality = image.select('BQA'); var cloud01 = ...