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V rámci distribuce ERA5 dat jsou uživatelům poskytovány datasety [ERA5 hourly data on single levels](https://cds.climate.copernicus.eu/datasets/reanalysis-era5-single-levels?tab=overview)a[ERA5 hourly data on pressure levels](https://cds.climate.copernicus.eu/datasets/reanalysis-era5-pressure-levels?tab=overview). Data v těchto redistribuovaných datasetech zahrnují celé území České republiky, jež je specifikováno bounding boxem[48.48, 12.07, 51.08, 19.00](http://bboxfinder.com/#48.480000,12.070000,51.080000,19.00000).
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As part of the ERA5 data distribution, users are provided with the datasets [ERA5 hourly data on single levels](https://cds.climate.copernicus.eu/datasets/reanalysis-era5-single-levels?tab=overview)and[ERA5 hourly data on pressure levels](https://cds.climate.copernicus.eu/datasets/reanalysis-era5-pressure-levels?tab=overview). These redistributed datasets cover the entire territory of the Czech Republic, specified by the bounding box[48.48, 12.07, 51.08, 19.00](http://bboxfinder.com/#48.480000,12.070000,51.080000,19.00000).
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K dnešnímu dni (7. listopadu 2023) jsou stažena data od října 2023 do srpna 2018, přičemž jsou stále stahovány starší data, až do prvního poskytovaného měsíce ledna 1940.
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As of today (November 7, 2023), data from October 2023 to August 2018 have been downloaded, and older data is still being downloaded, up to the first available month of January 1940.
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Seznamy proměnných, jež jsou v datasetech zahrnuty, jsou dostupné na stránkách:
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The list of variables included in the datasets is available at the following pages:
Veřejnosti jsou data zpřístupněna bez potřeby registrace prostřednictvím STAC katalogu na adresách [https://stac.cesnet.cz/collections/reanalysis-era5-single-levels](https://stac.cesnet.cz/collections/reanalysis-era5-single-levels) a [https://stac.cesnet.cz/collections/reanalysis-era5-pressure-levels](https://stac.cesnet.cz/collections/reanalysis-era5-pressure-levels).
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The data is available to the public without the need for registration via the STAC catalog at the following addresses:
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Data nejsou připravována pro specifický dotaz uživatele, ale jsou předpřipravená, kdy pro každý dostupný měsíc uvažovaného datasetu jsou k dispozici čtyřy produktové typy:
The data is not prepared for specific user queries but is pre-processed. For each available month of the considered dataset, four product types are available:
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- Reanalysis
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- Ensemble mean
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- Ensemble members
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- Ensemble spread
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Dle specifikace dat mohou být dále měněna a upravována a to až tři měsíce zpětně.
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According to the data specification, they can be further modified and adjusted up to three months retrospectively.
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Pro reflektování této skutečnosti jsou nyní data stahována do konce měsíce předcházejícímu aktuálnímu měsíci. Tedy například v listopadu bude posledním staženým měsícem říjen. Je ale nutné mít na paměti, že tato data se ještě můžou měnit.
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To reflect this, data is now downloaded up to the end of the month preceding the current month. For example, in November, the last downloaded month will be October. However, it should be noted that this data may still change.
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Dále pak dochází k aktualizaci a finalizaci dat, kdy je po 2. dni aktuálního měsíce stažen aktuálnímu měsící čtyři měsíce předcházející měsíc s finálními daty. Například tedy v listopadu budou stažena finální data pro červenec.
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Additionally, the data undergoes an update and finalization process, where the data for the current month is downloaded along with the final data for the previous four months after the 2nd day of the current month. For example, in November, final data for July will be downloaded.
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## Postup stažení
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## Download Procedure
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Data pro každý uvažovaný dataset a produktový typ jsou distribuovány ve formátu `.grib`a obsahují kompletní hodinová data pro všechny dostupné proměnné uvažovaného měsíce a pro dataset `reanalysis-era5-pressure-levels`také pro všechny úrovně tlaku.
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Data for each considered dataset and product type are distributed in `.grib`format and contain complete hourly data for all available variables of the considered month. For the `reanalysis-era5-pressure-levels`dataset, data is also available for all pressure levels.
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Jednotlivé měsíce jsou organizovány v ploché struktuře:
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Individual months are organized in a flat structure:
Copy file name to clipboardexpand all lines: docs/related/collgs/landsat.md
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Landsat is a program of Earth observation satellites operated by NASA and the U.S. Geological Survey.
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On July 23, 1972, the Earth Resources Technology Satellite (ERTS-1) was launched into Earth's orbit, later renamed Landsat 1.
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In subsequent years, additional Landsat satellites were launched, enabling the creation of a comprehensive archive of Earth observation data.
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Currently, two active satellites, Landsat 8 and Landsat 9, are in Earth's orbit.
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NASA and USGS are already collaborating on the development of future SLI (Sustainable Land Imaging) missions, which will include Landsat Next, the successor to Landsat 9.
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The satellites in the Landsat missions have optimal resolution and spectral bands, making it possible to efficiently monitor changes on Earth caused by climate change, urbanization, drought, fires, biomass changes, and numerous other natural and human activities.
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The Landsat program archive, containing data since 1972, provides critical information about Earth's surface and atmosphere that is unavailable from other sources.
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It represents the longest continuously operating archive of Earth observation data with optimal resolution.
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The Landsat program archive, containing data since 1972, provides critical information about Earth's surface and atmosphere that is unavailable from other sources. It represents the longest continuously operating archive of Earth observation data with optimal resolution.
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This archive serves not only as a fundamental data source for the U.S. Department of the Interior but also as a vital resource for the global population, supporting research, education, business, and many other activities.
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## Data Download
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The data is available to the public without the need for registration via the STAC catalog.
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According to the [STAC](https://stacspec.org/en) format specifications, data is divided into individual collections, as described in the section [Data Acquisition and Redistribution](#data-acquisition-and-redistribution).
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A detailed API description in English is available [here](https://stac.cesnet.cz/api.html).
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Additional information is also provided in the [section on the STAC Catalog](./stac.md).
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Items available in individual collections can be accessed via the [`/items`](https://stac.cesnet.cz/api.html#featuresapi--getfeaturesincollection) endpoint.
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For example, for the collection [Landsat 8-9 OLI/TIRS C2 L1](https://stac.vm.cesnet.cz/collections/landsat_ot_c2_l1), individual items are available at the endpoint `https://stac.vm.cesnet.cz/collections/landsat_ot_c2_l1/items`.
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The `items` endpoint returns 20 items by default; to browse the entire catalog, you need to paginate using the URL parameter `?page=page_number` or adjust the number of displayed items using the URL parameter `?limit=item_count`.
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Data is distributed in the `.tar` format, with each `.tar` file corresponding to one image. The download link for this archive is stored for each item in the JSON key `assets`. For example, for the item **[LC09_L2SP_191025_20240412_02_T1](https://stac.vm.cesnet.cz/collections/landsat_ot_c2_l2/items/8bb8514b-7e73-5a73-8c20-5835018825f3)**, the `assets` node contains metadata available in the `xml` format (**assets/mtl.xml**) and the actual data file (**assets/data**). The download link is stored in the subkey `href`.
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Data is distributed in the `.tar` format, with each `.tar` file corresponding to one image. The download link for this archive is stored for each item in the JSON key `assets`.
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For example, for the item **[LC09_L2SP_191025_20240412_02_T1](https://stac.vm.cesnet.cz/collections/landsat_ot_c2_l2/items/8bb8514b-7e73-5a73-8c20-5835018825f3)**, the `assets` node contains metadata available in the `xml` format (**assets/mtl.xml**) and the actual data file (**assets/data**). The download link is stored in the subkey `href`.
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It is recommended to download data using `wget`, as downloading via a web browser may be unstable.
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The STAC catalog can also be conveniently browsed using a graphical interface running directly in a web browser: [STAC Browser](https://stac.cesnet.cz/browser/).
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For example, for the dataset **[Landsat 8-9 OLI/TIRS C2 L1](https://stac.vm.cesnet.cz/collections/landsat_ot_c2_l1)**, the browser is available [here](https://stac.cesnet.cz/browser/external/stac.vm.cesnet.cz/collections/landsat_ot_c2_l1).
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