Bei der Erfassung von Formaldehyd auf Stufe 3 werden Spurengasinformationen auf einem regelmäßigen Raster bereitgestellt, das das TEMPO-Sichtfeld für nominale TEMPO-Beobachtungen abdeckt. Dateien der Stufe 3 werden durch Kombinieren von Informationen aus allen Dateien der Stufe 2 abgeleitet, die einen TEMPO-Scanzyklus in Ost-West-Richtung bilden. Die Raster enthalten Informationen zu vertikalen Formaldehydspalten, Hilfsdaten, die für die Berechnung von Luftmassenfaktoren und Referenzsektor- oder De-Striping-Korrekturen verwendet werden, sowie Flags für die Abrufqualität.
Der Algorithmus für die Neugitterung verwendet einen flächengewichteten Ansatz.
Eine Version dieses Datasets mit angewendeten QA-Filtern ist als NASA/TEMPO/HCHO_L3_QA verfügbar.
Summe der Überschneidungsbereiche von Pixeln der Stufe 2. Der Gewichtungsfaktor für jede Rasterzelle, der den Anteil der Rasterzellenfläche mit gültigen Daten angibt.
vertical_column
Moleküle/cm²
Meter
Vertikale HCHO-Spalte
vertical_column_uncertainty
Moleküle/cm²
Meter
Unsicherheit der vertikalen HCHO-Spalte
main_data_quality_flag
Dimensionslos
Meter
Hauptflagge für Datenqualität. Bietet eine Gesamtbewertung der Datenqualität
num_vertical_column_samples
Dimensionslos
Meter
Anzahl der Stichproben für vertikale Spalten
min_vertical_column_sample
Moleküle/cm²
Meter
Kleinste vertikale Spaltenstichprobe
max_vertical_column_sample
Moleküle/cm²
Meter
Größte vertikale Spalte – Beispiel
solar_zenith_angle
Grad
Meter
Zenitwinkel der Sonne in der Pixelmitte
viewing_zenith_angle
Grad
Meter
Zenitwinkel am Pixelmittelpunkt
relative_azimuth_angle
Grad
Meter
Relativer Azimutwinkel in der Pixelmitte
surface_pressure
hPa
Meter
Oberflächendruck
terrain_height
m
Meter
Geländehöhe
snow_ice_fraction
Dimensionslos
Meter
Anteil der Pixeloberfläche, der von Schnee und/oder Eis bedeckt ist
NASA/LARC/SD/ASDC. (ohne Datum). TEMPO gridded HCHO vertical columns V03
(PROVISIONAL) [Data set]. NASA Langley
Atmospheric Science Data Center DAAC.
Abgerufen unter https://doi.org/10.5067/IS-40e/TEMPO/HCHO_L3.003
Bei der Erfassung von Formaldehyd auf Stufe 3 werden Informationen zu Spurengasen auf einem regelmäßigen Raster bereitgestellt, das das TEMPO-Sichtfeld für nominale TEMPO-Beobachtungen abdeckt. Dateien der Stufe 3 werden durch Kombinieren von Informationen aus allen Dateien der Stufe 2 abgeleitet, die einen TEMPO-Scanzyklus in Ost-West-Richtung bilden. Die Raster enthalten Informationen zu vertikalen Formaldehydspalten, Hilfsdaten …
[null,null,[],[],[],null,["Dataset Availability\n: 2023-08-01T00:00:00Z--2025-09-05T12:26:52Z\n\nDataset Provider\n:\n\n\n [NASA ASDC](https://asdc.larc.nasa.gov/)\n\nTags\n:\n[air-quality](/earth-engine/datasets/tags/air-quality) [formaldehyde](/earth-engine/datasets/tags/formaldehyde) [nasa](/earth-engine/datasets/tags/nasa) [pollution](/earth-engine/datasets/tags/pollution) [satellite-imagery](/earth-engine/datasets/tags/satellite-imagery) [tropomi](/earth-engine/datasets/tags/tropomi) \n\nDescription \nFormaldehyde Level 3 collection provides trace gas information on a\nregular grid covering the TEMPO field of regard for nominal TEMPO\nobservations. Level 3 files are derived by combining information from\nall Level 2 files constituting a TEMPO East-West scan cycle. The\nrasters contain information on formaldehyde vertical columns,\nancillary data used in air mass factor calculations and reference sector\nor de-striping corrections, and retrieval quality flags.\nThe re-gridding algorithm uses an area-weighted approach.\n\n- A version of this dataset with QA filters applied is available as [NASA/TEMPO/HCHO_L3_QA](/earth-engine/datasets/catalog/NASA_TEMPO_HCHO_L3_QA)\n- [General Documentation](https://asdc.larc.nasa.gov/documents/tempo/guide/TEMPO_Level-2-3_trace_gas_clouds_user_guide_V1.2.pdf)\n\nBands\n\n\n**Pixel Size**\n\n2226 meters\n\n**Bands**\n\n| Name | Units | Pixel Size | Description |\n|-----------------------------------|-----------------|------------|--------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `weight` | km\\^2 | meters | Sum of Level 2 pixel overlap areas. Represents the weighting factor for each grid cell, indicating the fraction of the grid cell area with valid data. |\n| `vertical_column` | molecules/cm\\^2 | meters | HCHO vertical column |\n| `vertical_column_uncertainty` | molecules/cm\\^2 | meters | HCHO vertical column uncertainty |\n| `main_data_quality_flag` | Dimensionless | meters | Main data quality flag. Provides an overall assessment of the data quality |\n| `num_vertical_column_samples` | Dimensionless | meters | Number of vertical column samples |\n| `min_vertical_column_sample` | molecules/cm\\^2 | meters | Smallest vertical column sample |\n| `max_vertical_column_sample` | molecules/cm\\^2 | meters | Largest vertical column sample |\n| `solar_zenith_angle` | deg | meters | Solar zenith angle at pixel center |\n| `viewing_zenith_angle` | deg | meters | Viewing zenith angle at pixel center |\n| `relative_azimuth_angle` | deg | meters | Relative azimuth angle at pixel center |\n| `surface_pressure` | hPa | meters | Surface pressure |\n| `terrain_height` | m | meters | Terrain height |\n| `snow_ice_fraction` | Dimensionless | meters | Fraction of pixel area covered by snow and/or ice |\n| `fitted_slant_column` | molecules/cm\\^2 | meters | HCHO fitted slant column |\n| `fitted_slant_column_uncertainty` | molecules/cm\\^2 | meters | HCHO fitted slant column uncertainty |\n| `albedo` | Dimensionless | meters | Surface albedo |\n| `amf` | Dimensionless | meters | HCHO air mass factor |\n| `eff_cloud_fraction` | Dimensionless | meters | Effective cloud fraction |\n| `amf_cloud_fraction` | Dimensionless | meters | Cloud radiance fraction for AMF calculation |\n| `amf_cloud_pressure` | hPa | meters | Cloud pressure for AMF calculation |\n\n**main_data_quality_flag Class Table**\n\n| Value | Color | Description |\n|-------|-------|-------------|\n| 0 | None | good |\n| 1 | None | suspect |\n| 2 | None | bad |\n\nTerms of Use\n\n**Terms of Use**\n\nThis dataset is in the public domain and is available\nwithout restriction on use and distribution. See [NASA's\nEarth Science Data \\& Information Policy](https://www.earthdata.nasa.gov/engage/open-data-services-and-software/data-and-information-policy)\nfor additional information.\n\nCitations \nCitations:\n\n- NASA/LARC/SD/ASDC. (n.d.). TEMPO gridded HCHO vertical columns V03\n (PROVISIONAL) \\[Data set\\]. NASA Langley\n Atmospheric Science Data Center DAAC.\n Retrieved from https://doi.org/10.5067/IS-40e/TEMPO/HCHO_L3.003\n\nDOIs\n\n- \u003chttps://doi.org/10.5067/IS-40e/TEMPO/HCHO_L3.003\u003e\n\nExplore with Earth Engine **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)\n\nCode Editor (JavaScript) \n\n```javascript\nvar collection = ee.ImageCollection('NASA/TEMPO/HCHO_L3')\n .filterDate('2024-04-01', '2024-04-05')\n\nvar visParams = {\n min: 0,\n max: 1.5e16,\n bands: ['vertical_column'],\n palette: [\n '000080', '0000D9', '4000FF', '8000FF', '0080FF',\n '00D9FF', '80FFFF', 'FF8080', 'D90000', '800000'\n ]\n};\nMap.setCenter(-95.06, 42.02, 3)\nMap.addLayer(collection, visParams, 'HCHO vertical column')\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_TEMPO_HCHO_L3) \n[TEMPO gridded HCHO vertical columns V03](/earth-engine/datasets/catalog/NASA_TEMPO_HCHO_L3) \nFormaldehyde Level 3 collection provides trace gas information on a regular grid covering the TEMPO field of regard for nominal TEMPO observations. Level 3 files are derived by combining information from all Level 2 files constituting a TEMPO East-West scan cycle. The rasters contain information on formaldehyde vertical columns, ancillary ... \nNASA/TEMPO/HCHO_L3, air-quality,formaldehyde,nasa,pollution,satellite-imagery,tropomi \n2023-08-01T00:00:00Z/2025-09-05T12:26:52Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/IS-40e/TEMPO/HCHO_L3.003](https://doi.org/https://asdc.larc.nasa.gov/)\n- [https://doi.org/10.5067/IS-40e/TEMPO/HCHO_L3.003](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_TEMPO_HCHO_L3)"]]
