Questions tagged [cloudmasking]

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2 votes
0 answers
23 views

Mask cloud shadows of Sentinel-2 L1C (TOA reflectance) in GEE

I am trying to automate an analysis in Google Earth Engine using Sentinel-2 imagery. Sentinel-2 L2A (Bottom-of-atmosphere reflectance) imagery is not available in my study area, so I must use L1C (Top-...
2 votes
1 answer
45 views

Different methods for masking clouds of Sentinel-2 images in GEE

Working with GEE I noticed that there are different methods for masking cloud pixels in Sentinel-2 images. I would like to clear up some doubts about the different methods. Here are two of the ...
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0 votes
1 answer
61 views

What is exactly masked by this Landsat 8 QA Pixel cloud masking procedure in GEE?

I'm aware that there are a lot of questions already on this topic, however, I could not find an answer to my problem. For a project, I need to use a script with a cloud masking procedure written by ...
  • 586
1 vote
0 answers
24 views

Mapping Cloud Correcting Function using Google Earth Engine [closed]

I'm using the JavaScript API of Google Earth Engine. I'm running code given here and described in the developers forum here. The functions supplied work independently of each other, but at the bottom, ...
  • 181
0 votes
1 answer
388 views

Cloud masking and displaying a Sentinel 2 image collection in Google Earth Engine

I am trying to use the functions proposed here: Creating Sentinel-2 cloud free, cloud-shadow free composite or scene on Google Earth Engine (GEE)? to mask out clouds in a collection and display the ...
1 vote
0 answers
64 views

Quality Control process for MODIS Leaf Area Index in GEE

I am trying to mask certain features from MODIS LAI image such as cloud cover and image quality. MODIS LAI has two quality control measures - FparLai_QC and FparExtra_QC. I tried doing it with the ...
  • 87
1 vote
0 answers
132 views

Landsat 8 Collection 2 cloud-free mosaics in Earth Engine

I am trying to get cloud-free mosaics from 6-months periods of Landsat 8 Collection 2 Surface Reflectance. So far I've used geetools. My code consists of multiple modules so I can't paste it all here, ...
  • 656
0 votes
0 answers
157 views

The QA band of some Landsat 8 images seems to be invalid

I am quite confused about some invalid qa masks. In some images, the VALUE of the QA band is shown as 21824 (cloudless), but the location is actually covered by cloud. In addition to Landsat images, ...
  • 11
1 vote
1 answer
359 views

Masking clouds on Landsat8 with Python before NDVI [closed]

I'm new to remote sensing and trying to mask clouds with Python. I'm using the same method in Earth Data Science website (https://www.earthdatascience.org/courses/use-data-open-source-python/...
2 votes
1 answer
1k views

How to make a cloud-free composite for Landsat 8 Collection 2 surface reflectance in Earth Engine

Suppose I want to create a cloud-free composite of Landsat 8 Collection 2 surface reflectance images for summer 2021 of Washington state, USA. How can I do it? Here is the code to build the collection ...
0 votes
1 answer
137 views

Keeping the property system:time_start after applying a cloud mask to a Sentinel-2 level 2A collection in Google Earth Engine

I am using the following collection: 'COPERNICUS/S2_SR' for a project in Google Earth Engine. I used the suggested code to mask clouds (mask2collection). However when I print some images of the ...
1 vote
1 answer
341 views

Landsat 8 Collection 2 anomalies in TIRS1 data (from QA_PIXEL and ST_QA)

I am looking to use Landsat 8 TIRS1 data over a region in the Yukon, Canada and I am getting persistent masked pixels (from the PIXEL_QA or the ST_QA bands) along what appears to be the same Focal ...
1 vote
1 answer
187 views

Creating mean image from cloud free images over ROI in GEE for the Landsat SR products

I want to filter all the available cloud-free images of the Landsat series of each year separately and find the mean image in Google Earth Engine. As my ROI is very small, I want images that don't ...
  • 199
0 votes
1 answer
255 views

Masking clouds in S2 image collection and then fill null gaps?

I am trying to mask clouds in a Sentinel 2 image collection following this procedure: https://developers.google.com/earth-engine/tutorials/community/sentinel-2-s2cloudless#...
  • 3
0 votes
1 answer
35 views

Cloud Mask Assesment without Reference Cloud Mask

We have a cloud mask but we don't have reference data set to assess its accuracy. Without generating a reference dataset by ourselves is it possible to assess the cloud mask's accuracy?? For example; ...
  • 139
2 votes
0 answers
450 views

Generation of snow cover area time series in GEE using MODIS Snow Cover product

My aim is to resample MOD10A1/MYD10A1 to the same scale as that of MOD11A1/MYD11A1, mask the image collection to obtain the best pixels, and finally to obtain the time series plot of the total area ...
  • 37
1 vote
0 answers
44 views

Displaying the 8-Bit image's bits [closed]

I have an 8-Bit cloud mask derived using cloud masking software from Sentinel-2 L1C and want to visualize each bit separately. Is it possible? If yes, what kind of software can I perform this task? (...
  • 139
4 votes
1 answer
2k views

Understanding the Cloud Mask in Google Earth Engine

I would like to understand what the logic of this code is (I know that with this code it is possible to mask the pixels classified as cloud and cloud shadow of Landsat 8 images). I'm still having some ...
0 votes
0 answers
55 views

MAJA cloud mask TIFF file comparison with shapefile

I have created could mask using MAJA the result is TIFF file. I have a reference mask file which is a shapefile. I would like to see how accurately MAJA can produce the cloud mask as much as possible. ...
  • 139
-1 votes
1 answer
829 views

Removing Cloud From Landsat 7/8 using Google Earth Engine?

I am beginner in GEE and trying to apply cloud mask in my study area. I found one code and trying to apply in my area: link: https://code.earthengine.google.com/31b5b21913eefdc05563dfec72c4ee08 I am ...
2 votes
1 answer
1k views

Displaying the cloud free composite of Sentinel2 using s2cloudless in GEE [closed]

I applied the tutorial for 'Sentinel-2 Cloud Masking with s2cloudless' and have this script in GEE: https://code.earthengine.google.com/c525b3926841d4953e016e64682a4e5c In this tutorial, I do not ...
  • 483
0 votes
1 answer
401 views

Cloud masking the Landsat-8 Surface Reflectance product without using GEE

I have a collection of Landsat8 Collection2 Level2 images (surface reflectance) and I would like to cloud mask those images somehow, so I can further make a time series of NDVI and other remote sensor ...
  • 1
1 vote
0 answers
574 views

Median vs mean in GEE

I applied the cloud masking on Sentinel 2 imagery in GEE. The original image collection without masking clouds is this: First I tried the script exactly as written at the bottom of this page Sentinel-...
  • 483