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

Metadata Updated: August 9, 2018

The 500 meter MODIS Level 1B 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 Observing System Hierarchical Data Format (HDF-EOS). A typical MOD02HKM file size is approximately 135 MB.

Environmental information derived from MODIS L1B measurements will offer a comprehensive and unprecedented look at terrestrial, atmospheric, and ocean phenomenology for a wide and diverse community of users throughout the world.

See the MODIS Characterization Support Team webpage for more C6 product information at:

http://mcst.gsfc.nasa.gov/l1b/product-information

or visit Science Team homepage at: http://modis.gsfc.nasa.gov/data/dataprod/

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

References

http://modaps.nascom.nasa.gov/services/about/product_descriptions_terra.html
https://ladsweb.nascom.nasa.gov/data/search.html
ftp://ladsweb.nascom.nasa.gov/allData/61/MOD02HKM/
http://mcst.gsfc.nasa.gov/l1b/product-information

Dates

Metadata Created Date August 9, 2018
Metadata Updated Date August 9, 2018

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 9, 2018
Metadata Updated Date August 9, 2018
Publisher Not provided
Unique Identifier C1378577630-LAADS
Maintainer
ASAD ULLAH
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 2d3e6818-7a54-4259-8602-43260428d3df
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2017-05-05T00:00:00.000Z
Language en-US
Metadata Type geospatial
Data Last Modified 2018-04-04T00:00:00Z
Program Code 026:001
Publisher Hierarchy U.S. Government > National Aeronautics and Space Administration > Not provided
Related Documents http://modaps.nascom.nasa.gov/services/about/product_descriptions_terra.html, https://ladsweb.nascom.nasa.gov/data/search.html, ftp://ladsweb.nascom.nasa.gov/allData/61/MOD02HKM/, http://mcst.gsfc.nasa.gov/l1b/product-information
Source Datajson Identifier True
Source Hash ed66d29bab7180aa144f1a651deb77cd76821f60
Source Schema Version 1.1
Spatial -180.0 -90.0 180.0 90.0
Temporal 1999-12-18T00:00:00Z/2018-04-04T00:00:00Z
Category EOSDIS, ESIP, TERRA, geospatial

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