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10 votes

Why is short-wave infrared portion of electromagnetic spectrum so sensitive to fire?

According to Wien's law, the wavelength of the peak emission depends on the temperature. wavelength_of_peak = 2.898*10^(-3)/T where T is the temperature in degree Kelvin. So the wavelength of the ...
radouxju's user avatar
  • 49.8k
8 votes
Accepted

What is the annual data volume produced by the individual Sentinel satellite missions?

I found a pretty exact way to answer this question. It exploits the sentinelsat Python API to extract the desired information directly from ESA's SciHub: from sentinelsat import SentinelAPI api = ...
Michael's user avatar
  • 1,186
8 votes

Discrepancy between actual size of coordinates and clipped satellite image box sizes

Since you use .first() function, you get one image which you see after the code runs. To solve this issue: (1) remove .first() method and filter the collection by CLOUDY_PIXEL_PERCENTAGE. ...
Kadir Şahbaz's user avatar
7 votes
Accepted

Convert ERA5 data to WGS84

I ended up reaching out to the Copernicus support team and it turns out that ERA5 data is already referenced in the horizontal (lat/lon) with respect to the WGS84 ellipse so there is no need to ...
red's user avatar
  • 171
5 votes

Why is short-wave infrared portion of electromagnetic spectrum so sensitive to fire?

First, I would reword the question to "Why is fire "visible" in the short-wave infrared portion of electromagnetic spectrum ?" Second, I would like to add my 2 cents to @radouxju ...
gustavovelascoh's user avatar
5 votes

Determining if Sentinel-1 orbit is ascending or descending from absolute orbit number?

For the quick and dirty way to find out if it is ascending or descending, it is easier to look at the start (or end) time. For instance, in Belgium, you get the ascending images at around 5 PM and the ...
radouxju's user avatar
  • 49.8k
5 votes

Reclassify values of the land use land cover class of Copernicus Global Land Cover Layers in Google Earth Engine

The variable lulc1 is an image collection with 5 elements (images between years 2015 and 2019). If you want to reclassify it, it is preferable to map entire collection with a function. Following code ...
xunilk's user avatar
  • 30k
4 votes

Calculating area of snow cover in GEE

it looks like you dont have a band named 'NDSI'. Try adding this code: var ndsi = medianpixelsclipped.normalizedDifference(['B3', 'B11']).rename('NDSI'); However, you need to make some changes in ...
jfoguet's user avatar
  • 545
4 votes
Accepted

Guide book of SNAP

As of today, there is no specific book to learn how to use the program. You can always learn with the official documintation (https://step.esa.int/main/doc/) & the official tutorials : http://step....
Ofir's user avatar
  • 687
4 votes

GeoTIFF (ESA Copernicus data) georeferencing coordinates are mirrored and projection slightly off when checking on Google Maps

In case this is useful to anyone, I created a Python script that replicates the accepted answer and that can be used on a number of S5p files for a list of variables, without having to manually edit ...
curiousmind's user avatar
4 votes

Convert ERA5 data to WGS84

If you are using a NetCDF file, then your data is in EPSG:4326 geographic coordinates. To rotate the coordinates: https://github.com/corteva/rioxarray/issues/58 However, if you load in the native grib ...
snowman2's user avatar
  • 7,459
4 votes
Accepted

Filter list of objects by object property in GEE

ee.Filters are best when working with features and their properties, not dictionaries. Therefore, I recommend converting the dictionaries to features and the list to a feature collection: var ...
Kevin Reid's user avatar
  • 10.4k
3 votes
Accepted

Copernicus Sentinel - National Mirrors and Collaborative Ground Segments

A few days after the question was asked ESA started populating a list of existing and planned Collaborative Ground Segments and National Mirrors: https://sentinels.copernicus.eu/web/sentinel/missions/...
Kersten's user avatar
  • 9,919
3 votes

Copernicus Sentinel - National Mirrors and Collaborative Ground Segments

I know the Swedish and Norwegian and British ones are operational or about to be operational. I also found this resource which might be useful : https://sentinel.esa.int/web/sentinel/missions/...
O. Hagolle's user avatar
3 votes

Unable to add a Copernicus WMS to QGIS

The URL you give is not a WMS URL, despite it working for you in ArcGIS. The WMS URL for the service is at: https://copernicus.discomap.eea.europa.eu/arcgis/services/GioLand/VeryHighResolution2012/...
nmtoken's user avatar
  • 13.4k
3 votes
Accepted

GeoTIFF (ESA Copernicus data) georeferencing coordinates are mirrored and projection slightly off when checking on Google Maps

I think you are already there. I got the same extent as you, and this image: Note that the extent of the warped tif is now a rectangle in EPSG:4326, with corners different to the bended satellite ...
AndreJ's user avatar
  • 76.7k
3 votes

Getting water depth data in QGIS

If I understand your question correctly, you are looking for bathymetric data, that is, the topography of the seabed. As a general remark, bathymetric data is taken using echo-sounders. As echo-...
crafter6029's user avatar
2 votes
Accepted

Unable to add a Copernicus WMS to QGIS

Got it to work by using http instead of https. So instead of using the URL that you find on the Copernicus website: https://copernicus.discomap.eea.europa.eu/arcgis/services/GioLand/...
BritishSteel's user avatar
  • 6,647
2 votes

Downloading Sentinel images from Copernicus Scihub?

To download radar products such as sentinel 1 I would recommend Alaska satellite facility. https://search.asf.alaska.edu/#/
OscarBau's user avatar
  • 700
2 votes

Initiating offline product retrieval with wget for Scihub Copernicus

I had to escape the '$', '(', and ')' characters in terminal with a backslash. So: ~$ wget --content-disposition --continue --user="USERNAME" --password="PASSWORD" "https://...
Corbjn's user avatar
  • 349
2 votes

Sensing data Sentinel-3 time zone

As @JeffreyEvans said it's in GMT (or UTC to be more precise). This can be confirmed by checking out the time format seen in the manifest xml file, as well as the filename of the product. This is the ...
KostasVlachos's user avatar
2 votes

Convert ERA5 data to WGS84

Using Juanma Cintas' solution I found a simpler way of "flipping" the variable in the Xarray dataset was to use the .sortby(coordinate) method after converting the 0-360 longitude to ...
Simigant's user avatar
  • 141
2 votes
Accepted

Indexing Copernicus Global Land Service data into ODC

You may use the eodatasets3 library to index data hosted remotely, I've done it by indexing official Copernicus Global Land Cover data you can find in this S3 bucket (data access is documented here). ...
giob12's user avatar
  • 108
2 votes

Export hourly wind speed ERA5 data

If your aim is just to get the csv you mentioned, you don't need to map ERA5DOM to an ImageCollection and to make a chart. Instead, it is adequate to get a FeatureCollection from the function as shown ...
Kadir Şahbaz's user avatar
1 vote

Filtering clouds from average in Google Earth Engine

Im not sure for GEE , try this https://www.researchgate.net/post/atmospheric_correction_in_sentinel-2_images From doing it off GEE: see https://labo.obs-mip.fr/multitemp/theias-sentinel-2-l3a-monthly-...
Keryn A's user avatar
  • 11
1 vote

UMEP Copernicus downloader ERA5 throwing Python Error

It seems your dask installation is not a complete one, which is required by xarray. Install the complete dask as follows: pip install dask[complete] --user UMEP related issues should be submitted ...
sunt05's user avatar
  • 201
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.
André Rosa's user avatar
1 vote

Calculating area of snow cover in GEE

For me you would have to rewrite the last line like this: var area = ee.Number(reducer.get('ndsi')).multiply(scale).multiply(scale).divide(1000000); print('area of ndsi ', area.getInfo() + ' km2');
JUAN MANUEL's user avatar
1 vote
Accepted

Downloading Sentinel-1 SLC in individual bursts

Currently, the Copernicus Scihub does not feature to download single bursts, nor does any of the other portals (ASF, PEPS, AWS...). This is because of the data structure of Sentinel-1 SLC products. ...
AndyB's user avatar
  • 812
1 vote
Accepted

Downloading Sentinel images from Copernicus Scihub?

I would suggest using the Python API for this. Especially if you wish to download a lot of data, as it automates the process, unlike the Scihub. You're able to define an AOI as a geojson, and type in ...
Rhodri_22's user avatar
  • 360

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