Questions tagged [sentinel]
The sentinel tag has no usage guidance.
23
questions
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0answers
18 views
Mean monthly NDVI from Sentinel to CSV-files
I am trying to create monthly NDVI maps from Sentinel in Google Earth Engine. The script that I'm using is from things I gathered around the internet. When I try to download this to a CSV-file, I get ...
1
vote
1answer
56 views
Calculating EVI in Sentinel 2-2A
I am trying to calculate EVI for a Sentinel 2 Level 2A image collection. I have applied the Sentinel cloud mask provided by GEE but am not sure I am applying EVI correctly because my range is not ...
0
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0answers
11 views
Analysis of clustering results in SNAP
I have implemented K-means and Expectation- maximization algorithm on my sentinel-1 SAR image in the SNAP toolbox.
Now I want to compare which clustering result.is better using beta -cv or silhouette ...
0
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0answers
15 views
Seeking Moderate to High Resolution Forest Fire Before and After Images
I'm trying to search through the moderate to high-resolution satellite image data sets for imaging that shows forests both before and after a forest fire in order to assess the burn severity and the ...
1
vote
1answer
115 views
Authentification failed when using SentinelHub Plugin in QGIS
I downloaded SentinelHub v2 plugin into QGIS 3.14.
When I want to log in with my ID (from SentinelHub / Configuration Utility / ID) it says "Authentification failed, check your credentials"....
1
vote
1answer
57 views
Rasterio: select subset of georeferenced image by lop left coordinates and height, width
I want to subset a 10m sentinel dataset using rasterio window modul.
I have tried using the window = from_bounds(...) part in .read() however it requires for me to put in the left top right bottom ...
0
votes
2answers
155 views
Sentinel-3 single image per day
I have created a list of dates from which I would like to get Sentinel3 images, only to find that I have multiple images per day.
How can I reduce it to 1 image per day? I intend to do use median for ...
0
votes
1answer
58 views
Seeking Sentinel L1C images (.SAFE) from 2015-2019 since no longer available on Copernicus Open Access Hub
I am looking for Sentinel images from before 2019 in L1C quality and .SAFE format, as I want to correct them with sen2cor in SNAP to convert them to L2A quality.
Where can I find them now that they ...
0
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0answers
34 views
QA values on Sentinel-5p satellite data
I'm processing Sentinel-5p methane data and trying to understand the QA values held in a sidecar GeoTIFF. Data providers state a reading above 0.5 is valid, pointing to a value between 0-1. Data is ...
1
vote
0answers
73 views
Is sen2cor available as a Python library or can it only be used through the command line?
I am looking to correct older Sentinel 2 data to have BOA reflection and would like it to be part of a Python script (I'm working in Windows), but looking online it seems that you can only run sen2cor ...
0
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0answers
17 views
Sentinel 2 Conversion Relectance to Radiance?
Sentinel 2a level 2 digital number is a surface BOA reflectance. I want to convert this number to radiance, how should I do it?
I use ArcGIS or Snap (there is reflectance to radiance but it requires ...
0
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0answers
20 views
Can GEE code interactively access data from Google Cloud?
Can I interactively access raster files within GEE code if I send them to be saved in Google cloud storage and pay the fee for storage? Are there example lines of code for this?
I am trying to save ...
1
vote
1answer
75 views
How to identify landuse change with Sentinel data - specifically grassland/woodland to arable cropland changes
I have an assignment to assess whether it is viable to use sentinel data to monitor illegal changes of landuse from Grassland/Woodland to arable cropland.
This is the first time my environmental ...
0
votes
1answer
332 views
Max Pixel Value Error in Google Earth Engine
I've written below code in Google Earth Engine for carbon monthly product from sentinel-5 but when I click on the run button for save in Google drive, it shows error. How can I solve this problem?
...
2
votes
2answers
154 views
Manipulating Sentinel-1 SAR Imagery to get Pixel Information
For S1 SAR imagery data, how would I go about accessing the data of individual pixels? I need to analyze pixel intensity based on their lat and lon coordinates. I know this information is viewable in ...
1
vote
0answers
54 views
QGIS - sentinel and cubic resampling
I am having problem with cubic resampling applied on Sentinel S2 (resolution 10 m). I set Cubic resample when Zoom In, but the result is still the same - pixelated.
I have tried the same sentinel in ...
3
votes
1answer
283 views
Satellite image disappearing when zooming in
I'm trying to get a satellite image using the SentinelHub plug in.
This works, however, when I zoom in to make my other layers clearer (roads etc.) the satellite image disappears and the background ...
0
votes
1answer
100 views
Calibration annotation data for Sentinel-1 images downloaded from Sentinel Hub?
I received some Sentinel-1 tiff images that were downloaded via the WCS service, so they're just the tiff files, not the full SAFE-format products. They're for the IW GRD product, and my ...
2
votes
1answer
167 views
Sentinelsat: Error trying to download from Norweigan mirror colhub.met.no
I am trying to download the Sentinel 2 images over an area of Western Norway. Since the ESA archive is very slow, I am trying to use the Norwegian mirror for Sentinel instead (https://colhub.met.no/#/...
0
votes
1answer
264 views
How to download tile from Amazon’s Sentinel-2 service
How do I access Sentinel-2 imagery via Amazon?
I'm new to GIS and have been relying on USGS earth explorer and EO Browser but would now like to access satellite imagery with higher resolution. I ...
2
votes
2answers
379 views
Storing image with rasterio as gtiff modifies image histogram
I'm trying to store and image as as gtiff, but the resulting image is changed, and I can't explain why.
I'm reading sentinel jp2 band images using rasterio, I rescale these images from [0-10.000] to [...
0
votes
1answer
342 views
Running script with Sentinel 2 images?
How can run this script with Sentinel 2 images?
// Use a DateSlider to create annual composites of this collection.
var collection = ee.ImageCollection('LANDSAT/LC08/C01/T1');
// Use the start of the ...
2
votes
0answers
130 views
How to correct depth values with tide data? [closed]
We are trying to derive bathymetry using sentinel images using QGis 2.18.
The training data is from a boat gps track taken in 2 days. The depth value captured needs to be corrected for tidal ...
