Nasa satellite data formats
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NASA SATELLITE DATA FORMATS. Ana I. Prados, UMBC/JCET Steve Lloyd, Wyle Information Systems, Inc. AMS Giovanni Short Course January 11 th , 2009 . NASA Satellite Data. Formats in which the data are available Spatial resolution of the data

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NASA SATELLITE DATA FORMATS

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Nasa satellite data formats

NASA SATELLITE DATA FORMATS

Ana I. Prados, UMBC/JCET

Steve Lloyd, Wyle Information Systems, Inc.

AMS Giovanni Short Course

January 11th, 2009


Nasa satellite data formats

NASA Satellite Data

  • Formatsin which the data are available

  • Spatial resolutionof the data

  • Level of Processingof the data

  • Versions of the data

  • How to access datain various formats at the NASA GES DISC


Nasa satellite data formats

Data Formats

  • Text/ASCII

    pros: easy to read and examine the data right away (can read with used tools such as excel and GIS software)

    cons: large data files

  • Binary – HDF, NetCDF

    pros: takes less space, more information (metadata,SDS)

    cons: need specific tools or code to read the data

  • KML or KMZ (zipped KML)

    pros - easy 2D and 3D visualization of the data

    through free tools such as Google Earth. Data are very low volume


Nasa satellite data formats

Spatial Resolution of NASA Satellite Data Products

  • High Spatial resolution

  • 250x250m; 500x500 m; 1x1 km; 0.05x0.05 degrees

  • Example: MODIS True Color Imagery (RGBs)

  • Moderate Spatial Resolution

  • 0.25x0.25 degrees

  • Example: OMI Tropospheric NO2 (Giovanni and NASA

  • AVDC); TRMM precipitation products.

  • Giovanni Data Products

  • Primarily at 1x1 degree resolution (derived from each

  • data set’s native resolution product).

  • Example: AIRS surface air temperature


Nasa satellite data formats

Example of NASA High Spatial Resolution Product

2x2 km resolution MODIS TERRA

True Color Image over Southern California

January 4th, 2009

Source:NASA GSFC Rapidfire AERONET Subset for Fresno, CA


Nasa satellite data formats

Example of NASA Moderate Spatial Resolution Product (KMZ format)

0.25x0.25 degree OMI NO2

KMZ data format Eastern China (image saved from Google Earth)

September 1st, 2008

Source:NASA Giovanni


Nasa satellite data formats

Example of NASA Moderate Spatial Resolution Product (KMZ format)

0.25x0.25 degree OMI NO2

KMZ data format Eastern China (image saved from Google Earth)

September 1st, 2008

Source:NASA Giovanni


Nasa satellite data formats

1x1 degree product

(from data file in HDF format)

1 x 1 degree MODIS Aqua Aerosol Optical Depth

Giovanni generated GIF image (from HDF data file)

October 24th, 2007

Source:NASA Giovanni


Nasa satellite data formats

Levels of Data Processing


Nasa satellite data formats

Levels of Data Processing and Spatial Resolution

  • Level 1 and Level 2data products have the highest spatial and temporal resolution

  • Level 3 productsare derived products with equal or lower spatial and temporal resolution than Level 2 products


Nasa satellite data formats

Levels of Data Processing:

L2 (Level 2) Tropospheric NO2 (Swath Data)

Plotted from HDF data file

Grid is irregular (pixels are larger – lower resolution at swath edge)

Eastern China September 1st, 2008

Source:NASA GES DISC


Nasa satellite data formats

Levels of Data Processing:

L2G Tropospheric NO2 (Gridded Data)

0.25x0.25 degree L2G OMI NO2

KMZ data format. Eastern China (image saved from Google Earth).

September 1st, 2008

Source:NASA Giovanni


Nasa satellite data formats

Levels of Data Processing:

L3 (Level 3) TRMM 10-Day Rainfall

0.25x0.25 degree TRMM rainfall (some datasets can be recalculated)

Temporally averaged Global Map

November 1-10, 2008

Source:NASA Giovanni


Nasa satellite data formats

Data Versions

  • For each level of processing versions of data are periodically released as retrieval algorithms or other sources of information improve, e.g. V001, V002, V003

  • For some GES DIS products more than one version may be available

  • Note: Giovanni products are the most recent data version publicly available


Nasa satellite data formats

Accessing different data formats(Example: Giovanni Download Page)

GIF KMZ HDF Net CDF ASCII


Nasa satellite data formats

Putting it all together: data file names

OMI-Aura_L2G-OMNO2G_2009m0102_v003-2009m0103t171930.he5

Data product (OMI L2G Tropospheric NO2)

Time (hour minute, second)

Date (1/2/09)

Version (version 3)

Processing Date (1/3/09)

Data Format (HDF5)

Data format is HDF5

Level of Processing is L2G

Version 3

Source:GES DISC


Nasa satellite data formats

Conclusions

  • NASA satellite data formats are varied and the most appropriate depends on specific user needs

  • Available data formats include, ASCII, HDF, NetCDF, and KMZ

  • Satellite data vary in spatial resolution depending on instrument characteristics and the level of processing (L2, L2G, L3). The standard Giovanni resolution is 1x1 degrees. Re-gridding services and a few products allow access to other spatial resolutions


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