4
votes
Accepted
Why are there no Sentinel-2 images in northern latitudes from November to January?
The Sentinel-2 mission uses a sun-synchronous orbit and was planned to produce image products with similar local constant viewing conditions. The planned Local Time at Descending Node per image is 10:...
- 3,603
3
votes
Opening a Sentinel-2 image downloaded from esa scihub in QGIS
Open the metadata file "MTD_MSIL1C.xml" and select which dataset you want, the 10m, 20m or 60m bands.
- 69.6k
3
votes
What causes difference between two sources?
Geographic vs. Projected Coordinate Systems
The CRS (Coordinate Reference System) of the files you are using is EPSG:4326, which is the identifier of the plain WGS84 in EPGS's nomenclature.
Since ...
- 6,579
2
votes
Sentinel-1a real azimuth resolution
The formula that gives the azimuth resolution as being equal to half the antenna length is only true in Stripmap mode, where the satellite scans the ground as fast as it moves along its orbit.
The ...
- 271
2
votes
Accepted
Which time format does ESA use for Sentinel-3 file names?
This is the UTC time format according to the official source1, source2:
The time reference system in the SRAL/MWR Level-2 products is the Universal Time Coordinated (UTC).
- 8,208
2
votes
Accepted
Which version of Sen2Cor is used by the ESA?
You can check the processing baseline in the MTD_MSIL2A.xml file (inside .SAFE) under the tag . Sen2Cor v 02.08 started with the processing baseline 02.12. But notice that the S2 PDGS is using more ...
- 376
1
vote
Accepted
Transforming categorical land use raster to raster with continuous values
Example data with four classes
library(terra)
r <- rast(nrows=10, ncols=10)
set.seed(1)
values(r) <- sample(1:4, 100, replace=TRUE)
A solution is to use segregate to get a layer for each class. ...
- 11k
1
vote
Accepted
Less data from Sentinel 1B
The Sentinel-1 observation scenario shows your where and how the earth is imaged with the S1 pair.
https://sentinels.copernicus.eu/web/sentinel/missions/sentinel-1/observation-scenario
As you can see,...
- 8,718
1
vote
Opening a Sentinel-2 image downloaded from esa scihub in QGIS
They are inside the GRANULE folder. There are several subfolders and image format is JPEG2000. Everthing is explained here:
https://sentinels.copernicus.eu/web/sentinel/user-guides/sentinel-2-msi/data-...
- 914
1
vote
How can I know which Sentinel Tile is further north?
You could write a function that extracts and compares the last letter of each id.
The tile whose letter has the highest lexicographic order, is further north than the other.
- 111
1
vote
Projects using compatible Sentinel-2 and Landsat-8 reflectance data
I would check out the citing articles (n=108) from the 2018 NASA HLS paper:
https://www.sciencedirect.com/science/article/pii/S0034425718304139?via%3Dihub
That should give you an idea of some of the ...
- 225
1
vote
Limit to download images from Open Access Hub
There is a limitation with how many images you can download at a time. This is 2. But i don't believe there is a limitation overall.
However, if you're using Python, try the "sentinelsat" API.
...
- 360
1
vote
Changes in extent in sentinel image while calibration with snap tool
I believe your problem lies in the fact that you are using an SLC product. The IW mode is taken in the TOPS mode and requires TOPS processing. The process is to TOPS Split > Calibrate > TOPS Deburst.
...
- 131
1
vote
Accepted
Importing AWS downloaded Sentinel-2 data into SNAP software?
The Sentinel-2 L1C AWS bucket is populated by Sinergise, who also publish a Python library called sentinelhub-py that allows you to reconstruct the .SAFE format as expected by SNAP including the ...
- 9,947
1
vote
Can a satellite go over the same area in different passes overtime
Sentinel-1 definitely takes images of the same point on Earth in both ascending and descending passes. Just search for all images intersecting a point (or tiny area) on any service that provides ...
- 527
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