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MODIS/Terra Calibrated Radiances 5-Min L1B Swath 500m - NRT

Metadata Updated: December 7, 2023

The 500 meter MODIS Level 1B Near Real Time (NRT) data set contains calibrated and geolocated at-aperture radiances for 7 discrete bands located in the 0.45 to 2.20 micron region of the electromagnetic spectrum. These data are generated from the MODIS Level 1A scans of raw radiance and in the process converted to geophysical units of W/(m^2 um sr). Additional data are provided including quality flags, error estimates and calibration data.

Visible, shortwave infrared, and near infrared measurements are only made during the daytime (except band 26), while radiances for the thermal infrared region (bands 20-25, 27-36) are measured continuously. Channel locations for the MODIS 500 meter data are as follows:

        Band   Center Wavelength (um)    Primary Use
        ----   ----------------------    -----------
        1          0.620  - 0.670        Land/Cloud Boundaries
        2          0.841  - 0.876        Land/Cloud Boundaries
        3          0.459  - 0.479        Land/Cloud Properties
        4          0.545  - 0.565        Land/Cloud Properties
        5          1.230  - 1.250        Land/Cloud Properties
        6          1.628  - 1.652        Land/Cloud Properties
        7          2.105  - 2.155        Land/Cloud Properties

Channels 1 and 2 have 250 m resolution, channels 3 through 7 have 500 m resolution. However, for the MODIS L1B 500 m product, the 250 m band radiance data and their associated uncertainties have been aggregated to 500m resolution. Thus the entire channel data set has been co-registered to the same spatial scale in the 500 m product. Separate L1B products are available for the 250 m resolution channels (MOD02QKM) and 1 km resolution channels (MOD021KM). For the latter product, the 250 m and 500 m channel data (bands 1 through 7) have been aggregated into equivalent 1 km pixel values.

Spatial resolution for pixels at nadir is 500 km, degrading to 2.4 km in the along-scan direction at the scan extremes. However, thanks to the overlapping of consecutive swaths and respectively pixels there, the resulting resolution at the scan extremes is about 1 km. A 55 degree scanning pattern at the EOS orbit of 705 km results in a 2330 km orbital swath width and provides global coverage every one to two days. A single MODIS Level 1B 500 m granule will contain a scene built from 203 scans sampled 2708 times in the cross-track direction, corresponding to approximately 5 minutes worth of data; thus 288 granules will be produced per day. Since an individual MODIS scan will contain 20 along-track spatial elements for the 500 m channels, the scene will be composed of (2708 x 4060) pixels, resulting in a spatial coverage of (2330 km x 2040 km). Due to the MODIS scan geometry, there will be increasing scan overlap beyond about 20 degrees scan angle.

To summarize, the MODIS L1B 500 m data product consists of:

  1. Calibrated radiances, uncertainties and number of samples for (2) 250 m reflected solar bands aggregated to 500 m resolution

  2. Calibrated radiances and uncertainties for (5) 500 m reflected solar bands

  3. Geolocation for 1km pixels, that must be interpolated to get 500 m pixel locations. For the relationship of 1km pixels to 500m pixels, see the Geolocation ATBD ttp://modis.gsfc.nasa.gov/data/atbd/atbd_mod28_v3.pdf .

  4. Calibration data for all channels (scale and offset)

  5. Comprehensive set of file-level metadata summarizing the spatial, temporal and parameter attributes of the data, as well as auxiliary information pertaining to instrument status and data quality characterization Users requiring all geolocation and solar/satellite geometry fields at 1km resolution can obtain the separate MODIS Level 1 Geolocation product (MOD03) from LAADS http://ladsweb.nascom.nasa.gov/ .

The Shortname for this product is MOD02HKM and is stored in the Earth Ob

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources

Dates

Metadata Created Date November 12, 2020
Metadata Updated Date December 7, 2023

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date November 12, 2020
Metadata Updated Date December 7, 2023
Publisher NASA/GSFC/EOS/ESDIS/LANCEMODIS
Maintainer
Identifier C1426415307-LANCEMODIS
Data First Published 2017-10-11
Language en-US
Data Last Modified 2023-07-20
Category DODS, EOSDIS, ESIP, OPENDAP, TERRA, geospatial
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Citation LANCEMODIS. 2017-09-10. MODIS/Terra Calibrated Radiances 5-Min L1B Swath 500 m - NRT. Version 6.1NRT. MODAPS at NASA/GSFC. Archived by National Aeronautics and Space Administration, U.S. Government, The Land, Atmosphere Near real-time Capability for EOS (LANCE). https://doi.org/10.5067/MODIS/MOD02HKM.NRT.061. https://earthdata.nasa.gov/earth-observation-data/near-real-time/download-nrt-data.
Creator LANCEMODIS
Harvest Object Id 550e7e39-5826-4fc5-86af-76686c7430a1
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
Homepage URL https://doi.org/10.5067/MODIS/MOD02HKM.NRT.061
Metadata Type geospatial
Old Spatial -180.0 -90.0 180.0 90.0
Program Code 026:001
Release Place MODAPS at NASA/GSFC
Source Datajson Identifier True
Source Hash 51b0f45605e0d726b75b87b98d8e9a8e0bf6d7e578b3e9d1e9b538d3c4ac0343
Source Schema Version 1.1
Spatial
Temporal 2017-10-11T00:00:00Z/2023-07-24T00:00:00Z

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