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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Where do those cloud data overlay images come from

Certain time-based (rain) cloud data appears on different sites and apps. This gives the impression that the rain and cloud data is available (for free or licensable), and that multiple sites make use ...
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362 views

How to preprocess and remove noisy data from Landsat-8 image Bands for ndvi time-series analysis

I'm working on satellite image processing, I'm calculating NDVI for time series analysis and vegetation prediction. I'm having a tough time removing the noisy data like, Cloud coverage Haze Cloud ...
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1answer
300 views

Quality of median image

I am trying to do supervised land use classification in a certain region. As this region is naturally prone to clouds, I have filtered the image collection on images with less than 10% cloud cover and ...
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Creating cloud feature after applying Landsat8 Cloud Masking [duplicate]

There is a script in GEE to mask cloud: // This example demonstrates the use of the pixel QA band to mask // clouds in surface reflectance (SR) data. It is suitable // for use with any of the ...
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1answer
754 views

Apply a cloud filter to a Landsat8 collection in Google Earth Engine

I have loaded a collection of landsat8 images bounded by sudanmaps. My goal is to filter out all images that have cloud in it. I tried the method given in Filter Landsat images base on cloud cover ...
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1answer
561 views

Cloud mask using pixel_qa

I need to create a cloud mask using the pixel_qa band, this is the code that I have so far: var city = ee.Geometry.Point(9.15, 45.18); var landsat8 = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR') // ...
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308 views

MODIS surface water and cloud shadow

I am trying to set up a daily water and cloud detection system and need to use a high temporal resolution. Therefore I intend on using daily MODIS imagery (MOD09GQ). In the water detection, cloud ...
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1answer
407 views

Masking cloud pixels for NDVI in QGIS

I'm using QGIS to analyze some image of the NOLA area pre- and post-hurricanes. I'd like to calculate NDVI and a couple other indices for the images, but I want to exclude pixels with clouds in them ...
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1answer
269 views

Chart of cloud cover over time

I am trying to create a graph with the cloud cover over time, per year. The following code gives me a graph, but I don't manage to get the dates on the x-axis line up chronological. Am I doing ...
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1answer
2k views

Cloud cover percentage in Google Earth Engine

I'm doing a project at my university about the Cloud cover percentage in determinate areas in the world. I'm completely new to Google Earth Engine and I'm struggling a lot trying to find a solution ...
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1answer
2k views

Google Earth Engine - filter landsat by cloud cover over multiple polygons

I want to make a Landsat image collection that is totally cloud free over a SET of polygons. I have about 300 polygons (all within a single Landsat tile). I found this question, which is doing exactly ...
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1answer
850 views

Cloudless days count with MODIS in Google Earth Engine

I'm trying to estimate the total of clear days in a year with the help of state_1km band in the MOD09GA product. But I'm not sure if it is right, also the possible counts are higher than expected when ...
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176 views

Retrieve sentinel2 cloud mask through an API

Have you ever heard about an API to download sentinel2 cloud mask only ? Not all bands but just cloud mask. Because I just want to process a small part of each satellite tile and it's very time ...
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1answer
2k views

Apply a cloud mask to a Landsat8 collection in Google Earth Engine - time series [duplicate]

I have tried to apply a cloud mask for a landsat 8 collection using code1, code2, and code3 but none will work. code1 encounters the error of not working even after changing var mask = img.select(['...
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268 views

Cloud detection in various scenes in R

I have 99 LS8 scenes (mountainous terrain) and before processing them any further I would like to mask out cloudy and snow pixel since they might mess up the topographic correction I have to apply. My ...
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3answers
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Creating Sentinel-2 cloud free, cloud-shadow free composite or scene on Google Earth Engine (GEE)?

Using this code, I am able to get a cloud-free composite, but it still includes shadows in my image. var collection = ee.ImageCollection("COPERNICUS/S2") .filterBounds(ee.Geometry.Rectangle(-85....
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Is it possible to create an average image of the analyzed period after the removal of the clouds to fill the flaws in the images?

// study area var local = ee.Geometry.Rectangle([-42.2974, -20.5299,-40.9406, -19.1815]); Map.addLayer(local); var landsat8 = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR') // Fmask classification ...
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169 views

Finding least cloudy Sentinel-2 granule for non-rectangular ROI and given season in Google Earth Engine

We need to download cloudless Sentinel-2 data for a rather large number of regions of interest (ROIs), which are provided in the form of geojson polygons. Unfortunately, relying on the cloud cover ...
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1answer
1k views

Google Earth Engine: Finding least cloudy pixel of Landsat 8 images in ROI

I am having trouble cloud-screening Landsat 8 imagery in Google Earth Engine for a country with high cloud cover throughout the year. I have tried various techniques but unfortunately there is a ...
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1answer
1k views

Remove clouds in Sentinel 2A with R?

I would like to know how to remove clouds (create a cloud mask and its shadows) for Sentinel 2A data, using R (Windows). I have seen Information about this on Python or Matlab, but I work so far only ...
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1answer
6k views

Sentinel Cloud-free Collection Google Earth Engine Code Editor

I am trying to create and map an image collection (not image or mosaic if that is even possible), where QA60 defines the Cloud-mask. I have written the code below - however, it seems the Jan2016 ...
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1answer
307 views

What bands should be used to identify clouds using the cloud function of the landsat package in LANDSAT 8 scenes?

I am trying to use the clouds function of the landsat r package to identify clouds in my LANDSAT 8 scene. In the package help, it is said that reflectance bands 1 and 6 should be used: clouds(...
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2answers
687 views

AWS Sentinel 2 incorrect cloudy pixel percentage

For some tiles with low data coverage percentage metadata and tileInfo contain cloudy pixel percentage value equal 0. Examples: http://sentinel-s2-l1c.s3-website.eu-central-1.amazonaws.com/#tiles/37/...
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1answer
2k views

Add a 'cloud' band to Sentinel 2 images (GEE)

This script is used to mask out cloud in sentinel 2 images using a threshold for band 4: // Sentinel 2 cloud function var cloudfunction_ST2 = function(image) { // If band 4 is higher than 2500, ...
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Filter Landsat images base on cloud cover over a region of interest

My goal is to create an image collection that has 100% free cloud over a small region of interest, for example a lake. This script filters landsat 8 images based on location and cloud cover: var ...
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1answer
300 views

Cloud detection based on 4 bands

I have a series of satellite images in 4 bands (red, green, blue and NIR). What is the easiest way to estimate what percentage of each image is covered by clouds? The image is less than 1x1 km with 3-...
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1answer
842 views

Google Earth Engine. Looking for a way to have information for each location in the mentioned time period based on the non-cloudy layers

I am trying to work with landsat5 in Google Earth Engine and get some information for a list of locations (I have long/lat of the locations and their postal codes in a Fusion Table). I am looking ...
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2answers
3k views

Do clouds reflect NIR/Red bands

When using Landsat 8 imagery to calculate NDVI, will the NIR and Red bands be affected by cloud cover? In other words, will clouds produce a wrong NDVI calculation?
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1answer
376 views

Whole image cloud cover for LC8_SR?

I need to filter the LANDSAT/LC8_SR image collection using an assessment of total cloud cover in the entire scene of each image. i.e. each image in the collection is "in" or "out" based on a ...
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1answer
3k 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. ...
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1answer
2k views

Sentinel-2 cloud mask with fmask

I'm trying to run fmask on a Sentinel-2 granule. I downloaded the 3.2 version of Windows stand alone software for Sentinel 2 from https://github.com/prs021/fmask When I try to run fmask by calling the ...
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1answer
2k views

Google Earth Engine. How to get cloud cover score for each image in image collection?

I want to estimate cloud cover of each image in an image collection + would like to print out results for every image. I can see that cloud cover estimates are available for each image in their ...
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1answer
934 views

Getting rid of clouds from Landsat using ArcMap?

I want to calculate deforestation using Landsat 2 images. Right now I am using the raster calculator to generate a NDVI image and then the reclassification or Iso Cluster Unsupervised classification ...
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1answer
128 views

How to interpolate noise values on a landsat image time series using flag data?

I need to create a function to interpolate noise values on a landsat image time series by the mean on a time span of 2 (xt+1 and xt-1). I´m using the fmask product to detect cloud and shadow, then ...
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3answers
3k views

Removing cloud from Sentinel 2A imagery?

I would like to use sentinel 2A imagery to look at canopy cover in Northern Vietnam. The only problem is that ALL the recent images have large amounts of cloud in the area I want to look at. Is it ...
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1answer
1k views

How to remove clouds with the cf_mask.tif file provided from landsat 8 surface reflectance data?

I just downloaded my first group of landsat 8 surface reflectance data files. In this package contains sr bands 1-7 (I hope to use some of these to create an NDVI) as well as numerous files called: ...
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2answers
525 views

Landsat 8 cloud detection without band 9

What is the best possible way to create a cloud mask of a Landsat 8 scene without using band 9? I think the best way will be to determine the cloud cover by thresholding in the Panchromatic band and ...
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2answers
445 views

Downloading MODIS data of cloud cover less than 10%

I use ModisDownload from rts package for downloading MODIS data. But is it possible to specify cloud cover and view angle before downloading? e.g. if I want to download MODIS data for cloud cover less ...
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129 views

Grass i.landsat.acca says image is cloud free but it is not

I'm working on an area in Amazonia with high cloud persistance which makes global data on land cover quite useless at small scales, so I wanted to learn to process my own Landsat images, with GRASS ...
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2answers
803 views

Deleting multiple polygons at once in ArcGIS 10.1?

I have a cloud mask shapefile that accidentally identified buildings as clouds. I want to delete this mass of polygons in Arcmap 10.1 by highlighting all of them and pressing delete. Then re-saving ...
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0answers
149 views

Cloud and cloud shadow identification with MERIS

I am looking at MERIS images to use for marine applications (Chl-a. SPM) and would like to confidently remove cloud and cloud shadow pixels from the data. I have a few ideas: Using the blue band ...
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1answer
2k views

How can I parse modis MOD13Q1 quality layers in R?

I'd like to parse MOD13Q1 VI quality layers in R. My original code must have been incorrect, because it gave lots of "deep ocean" flags in the middle of Brazil. After the changes suggested by Mikkel,...
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2answers
5k views

Removing cloud cover on LandSat 8 imagery using ArcGIS for Desktop? [closed]

How can I remove cloud cover on landsat8 imagery? using ArcGis10.2
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1answer
452 views

Having trouble finding cloud cover data

I'm working on a project for a GIS course, I chose to find the best locations for the placement of an observatory. To accomplish this I planned to use cloud cover (or percentage of clear nights), ...
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3answers
2k views

Is there a FTP to get Landsat images?

I need to automatically fetch Landsat images and for that it would be handy to access a ftp with images available. Does such ftp exist? Can I access it? Ultimately I want to get cloudless images.
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2answers
2k views

Shifting cloud mask in Erdas/ArcMap/Py Script [closed]

I have the task to mask out cloud cover in approximately 20 landsat 8 scenes. Creating the cloud mask for the "white part" is easy, but I need help in addressing the clouds shadow. General ...
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1answer
326 views

How can I shift raster layer for making cloud-shadow mask?

I want to make cloud shadow mask in QGIS. I have raster cloud mask and I have to shift it by X,Y coordinates. Is there any easy solution?

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