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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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Extracting QA bits for cloud mask with MOD09GA state 1km band using Google Earth Engine

I'm working on code for detecting fog and low stratus (FLS) using the QA bits from the state_1km band of the MOD09GA.061 product. I'm trying to select pixels classified as clouds (bit 0-1 Cloud State: ...
Andres Arguedas's user avatar
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1 answer
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GEE - Modifying x-axis to represent time of day or day of year

I've been trying to create a graph in GEE that depicts cloud coverage % over either time of day or day of year. I've been able to make the graph, but the x-axis is labeled by "COPERNICUS/...
eamrl's user avatar
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QGIS - cloud masking and how to mosaic

I have downloaded two Landsat 8 images for the year 2015 (one from May and one from July) from Earth Explorer and they both have minimal cloud cover. I'm at the pre-processing stage, where I want to ...
anonymous's user avatar
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Calculating Cloud Opacity for a location using EUMETSAT SEVIRI raw data

I'm using EUMETSAT SEVIRI raw data (EO:EUM:DAT:MSG:HRSEVIRI) to try calculate cloud opacity. However I am struggling to find a way to calculate it using the different channels that are offered. How ...
Gideon Weiss's user avatar
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2 answers
286 views

Inaccurate cloud shadow masks when using Earth Engine's script for Sentinel 2

I am currently evaluating my cloud shadow masking options for Sentinel-2 data. One of the options I am exploring is using an example script published by Google that projects cloud shadow locations ...
TheBackwardsman's user avatar
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1 answer
43 views

How to avoid, Tile Error: User memory exceed when trying to preform a Sentinel-2 SR cloud masking with s2cloudless

I am trying to create a 2 cloudless composites of Sentinel-2 imagery over a region of interest that is pretty cloudy. I found an example script in GEE java script API that does a pretty aggressive ...
user231432's user avatar
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Landsat-5,7 stripe error

I applied the algorithms to mask cloud in Landsat-5,7 for collection 2, but there are still some stripes in the results. Can anyone help me to figure out this problem? Here is my code: https://code....
nicholaskr23's user avatar
1 vote
1 answer
283 views

Sentinel-2 Level 2A clouds removal

I tried to remove clouds from Sentinel-2 imagery (Level 2A) using ESA SNAP. I use SNAP 9.0.0. I tried to follow the tutorial "Automatic cloud Masking of Sentinel 2 Imagery Using ESA SNAP". ...
Thakshila's user avatar
1 vote
0 answers
519 views

Google Earth Engine cloud cover sorting and area of interest

I see in a lot of examples that people are sorting a stack by cloud cover and then pick the first image. Example: image = image.filterDate('2022-01-01', '2023-01-01') .filterBounds(...
BritishSteel's user avatar
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2 answers
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Get a specific number of images from a sorted image collection in Google Earth Engine

I want to export the first 10 images of a Landsat image collection sorted based on the "CLOUD_COVER_LAND" property. I know how to extract the least cloudy image of the sorted collection by ...
diego bárb's user avatar
1 vote
1 answer
323 views

Cloud correction in QGIS

I have a Landsat 7 scene with many clouds in it. I like to correct it in QGIS. My supervisor told me to interpolate it with a scene before and a scene after. I am struggling on how to do that. Do I ...
isabel_wa's user avatar
1 vote
1 answer
832 views

How to acquire Sentinel-2 cloud mask files?

BACKGROUND: At 3.22.12, I download Sentinel-2 files (both L1C and L2A) using the Semi-Automatic Classification (SCP) plugin. Some of the imagery contains cloudy areas that I would like to mask out. ...
Stu Smith's user avatar
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1998 smoke imagery in Alaska

I am trying to access smoke/cloud imagery above the Alaska region during August of 1998. I would like to use GEE, but I haven't been able to find a dataset with good coverage. I have looked at Landsat ...
Alana Macken's user avatar
1 vote
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996 views

Earth Engine: Landsat 8 QA_PIXEL issues with cloud, shadow, and land masking

Using the QA_PIXEL band in Landsat 8 to mask out clouds, cloud shadow, and land often masks out large areas of water. The QA_PIXEL band identifies these water areas as land and cloud shadow, when this ...
Matt's user avatar
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1 answer
382 views

Cloud filtering Landsat collection 2 time series by region

I'm working on creating an NDVI time series and I'm trying to filter out clouds over a specific region so I wont get huge gaps in the time series. Is there a way to reduce the extent by cloud percent? ...
Tom Collier's user avatar
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1 answer
600 views

Cloud filtering Landsat collection 2 over specific regions

I'm trying to filter clouds over a specific region for an NDVI time series using Landsat collection 2. I tried filtering with simple cloud score but it doesn't seem to work (maybe because there is no ...
Tom Collier's user avatar
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1 answer
304 views

Landsat 8 Cloud Masking using Pixel QA in ArcMap

I have a scene that has clouds and shadows which I would like to mask before I continue with my Classification. I am using LC08_L1TP_180073_20141224_20170416_01_T1 which has a pixel QA file. I ...
Ndahambelela's user avatar
1 vote
2 answers
685 views

Why do I get an error when applying getInfo() in Google Earth Engine?

I'm working in an undergraduate project and just started using Google Earth Engine. Firstly, I need to filter some Sentinel-2 MSI images that cover my area of interest (a watershed with 55 km²) from ...
Bruno Rech's user avatar
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0 answers
160 views

Classify unclassified patches that were left after cloud removal for Landsat 8, using Google Earth Engine

I am trying to classify my study area, using Random Forest using Landsat 8 dataset of GEE. The first problem that I came across was clouds, so to remove them I used as follows var mask = require('...
Learner's user avatar
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4 votes
1 answer
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Cloud Shadow Removal for Sentinel-2

I am trying to classify my study area with a RandomForest classifier, using Sentinel-2 Surface Reflectance images. This classification gave me an accuracy of about 87%. I calculated the misclassified ...
Learner's user avatar
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2 answers
787 views

Getting Cloudfree image for small area (Sentinel-2) using Google Earth Engine

I am trying to get a cloudfree image from Sentinel-2 for multiple small areas (circles with a radius of 20km) in Ghana, a very cloudy area. Using the standard algorithms (median image, filter for ...
erpunkt's user avatar
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0 votes
1 answer
256 views

Cloud cover percentage of Sentinel2 L1C [closed]

The following graph shows the frequency of cloud percentage of a Sentinel-2 L1C tile in 2021, and it seems like only 10 dates have cloudcover less than 10%. I am wondering: 1, How much percentage of ...
yongyuuu's user avatar
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1 answer
51 views

GRASS GIS i.sentinel.mask Error

I am trying to run i.sentinel.mask in GRASS GIS 7.8.5 I am having the following Error: ERROR: Option <input_file> is mutually exclusive with all of <blue>, <green>, <red>, <...
HansrajR's user avatar
  • 537
4 votes
1 answer
937 views

Cloud mask algorithms for Sentinel-2 Level-2A data

I am trying to find the best Sentinel-2 cloud mask algorithm for Level-2A data that can be integrated in a Python script and that works well on oceanic areas. I am working with level-2 data because I ...
Just_4n0th3r_Pr0gr4mm3r's user avatar
1 vote
0 answers
109 views

Easy way to create cloudless mosaic

Is there an easy way (or easy access database) to create cloudless mosaics for a country (e.g. Germany) from Sentinel-2 data? I found this ressource: https://registry.opendata.aws/sentinel-s2-l2a-...
Lenn's user avatar
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0 votes
1 answer
300 views

Landsat Quality Assessment for a Cloud Mask

I'm relatively new to GIS and am wanting to mask out the clouds of Landsat images using the supplied QA band, I'm limited to free programs, mainly QGIS. So far I've managed to get a cloud mask ...
shaza Lee's user avatar
3 votes
1 answer
3k views

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 ...
maniiko's user avatar
  • 73
2 votes
1 answer
869 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 ...
Matteo Giomo's user avatar
1 vote
1 answer
400 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 ...
svollowork's user avatar
3 votes
1 answer
1k 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)); ...
rez's user avatar
  • 202
10 votes
2 answers
2k 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 ...
zabop's user avatar
  • 2,224
2 votes
1 answer
764 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 ...
Reece Allen's user avatar
3 votes
3 answers
3k views

Google Earth Engine: Understanding Landsat 7 Collection 2 QA_PIXEL, bitwiseAnd() for cloud mask

I want to see how the new Landsat 7 Collection 2 (C2, 'LANDSAT/LE07/C02/T1_L2') differs from Collection 1 (C1). I have created an adequate Landsat 7 C1 composite since GEE provides a cloud mask ...
Matt Payne's user avatar
3 votes
1 answer
369 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 ...
Edu's user avatar
  • 33
0 votes
1 answer
369 views

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. var geom = ee.Geometry.Point(...
Jkhadgi's user avatar
3 votes
1 answer
138 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 ...
Enache Ionuț's user avatar
1 vote
1 answer
336 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 ...
Fafa's user avatar
  • 13
1 vote
0 answers
1k 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'); ...
Salvatore Praticò's user avatar
1 vote
1 answer
459 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 ...
Mar Roca's user avatar
1 vote
1 answer
872 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 ...
Rizki Atthoriq's user avatar
0 votes
1 answer
158 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 ...
em.popcorn2's user avatar
2 votes
1 answer
472 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 ...
em.popcorn2's user avatar
0 votes
1 answer
152 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 ...
Jeremy Irvin's user avatar
2 votes
2 answers
477 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 ...
em.popcorn2's user avatar
0 votes
1 answer
211 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 ...
Madeline Lisaius's user avatar
0 votes
1 answer
426 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 ...
Rim Sleimi's user avatar
1 vote
1 answer
470 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 ...
user7831861's user avatar
7 votes
2 answers
2k 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 ...
laurent's user avatar
  • 81
0 votes
0 answers
121 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 ...
Agnes's user avatar
  • 145
1 vote
0 answers
236 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- ...
Chelsea_VictoriaS's user avatar