The 1 km AVHRR Global Land Data set project is an international effort to acquire, archive, process and distribute the data of the entire global land surface observed by the NOAA/AVHRR satellite mission at 1 km resolution, in order to meet the needs of the international science community, (IGBP, 1992). A network of 29 High Resolution Picture Transmission (HRPT) stations, along with data recorded by the NOAA, has been acquiring daily global land coverage from the NOAA-11 satellite since the first of April 1992. The continuous flow of data coming from these stations is routinely archived by USGS and ESA. A common archive exists at the EROS data centre of the USGS and at the ESRIN of ESA. The number of pass acquired per year is around 15000. The project intends to process all acquired data to generate for any 10-days period in the project time-span (April 92 - September 94) a land composite product (1444k) covering the whole world surface, as defined by Townsend et al., 1992. AVHRR floating scenes are provided in SHARP format. SHARP is the ESA Earthnet format for AVHRR and TOVS data generated to provide an easy data access for the international Remote sensing user community. SHARP-1 consists of two volumes: AVHRR volume and TOVS volume. In order to save user time in extracting from the raw data the useful quantities needed for the problem at hand, a family of higher level products has been proposed by Earthnet: this is SHARP level-2. The SHARP level-2A (Geophysical Product) contains geophysical parameters extracted from AVHRR raw data (Vegetation Index and Sea Surface Temperature) as well as calibrated data and a classification of the image. Each pixel contains image data (calibrated), a classification and geographical information (boundaries, coastlines and lat/long grid flags). Each pixel consists of 2 bytes; 10 bits are used for image data, 3 bits for the classification and 3 bits for geographical data. The classification includes land, cloud, sea, snow/ice and unclassified pixels. SHARP-2 products are produced from archived SHARP-1 day-time data. SHARP-2 products will not be archived. TOVS data remains the same as for SHARP-1 products. The SHARP-2B product consists of: - 2 bands (1 and 5) containing class depending geophysical parameters - 3 bands (2,3 and 4) containing calibrated data converted in equivalent Reflectance (band 2), AVHRR channel 3 spectral Radiance (band 3) and AVHRR channel 4 Brightness Temperature (band 4). Characteristics of Band 1, Class dependent parameter: --------------- Land: Normalized Difference Vegetation Index (NDVI) Sea: Equivalent Reflectance from Channel 1 cloud: Equivalent Reflectance from Channel 1 snow/ice: Equivalent Reflectance from Channel 1 glint: Equivalent Reflectance from Channel 1 unclass: Equivalent Reflectance from Channel 1 ------------ Characteristics of other Bands: --------------- Band 2: Channel 2 Equivalent Reflectance Band 3: Channel 3 Spectral Radiance Band 4: Channel 4 Brightness Temperature Band 5 over sea: Sea Surface Temperature (SST) Band 5 over other areas: Brightness Temperature from Channel 5 ----------------- Note: 'Band' refers to the output data structure of the SHARP products; 'Channel' refers to the input satellite data acquired in different wavelengths. This product can be produced with data from all the operating NOAA satellites; however, if the data is derived from the even-numbered satellites, band 5 is empty. Geometric Correction: Image navigation (location) is carried out during Level 1 data generation, using the orbital model for the satellite location and is tested by an operator who carries out further correction if necessary. SHARP-2 products are in the original spacecraft projection. A location grid of tie points (lat/long) is given in the suffix data (every 16th image file record). To order data, please see "http://earth.esa.int/"

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• 1KM.AVHRR.TOVS.SHARP2B

ESA Short Name: 1KM.AVHRR.TOVS.SHARP2B Version ID: Not provided Unique ID: C1214559954-ESA

The goal of the Alaska Advanced Very High Resolution Radiometer (AVHRR) project is to compile a time series data set of calibrated, georegistered daily observations and twice-monthly maximum normalized difference vegetation index (NDVI) composites for Alaska's annual growing season (April-October). This data set has applications for environmental monitoring and for assessing impacts of global climate change. An Alaska AVHRR data set is comprised of twice-monthly maximum NDVI composites of daily satellite observations. The NDVI composites contain 10 bands of information, including AVHRR channels 1-5, maximum NDVI, satellite zenith, solar zenith, and relative azimuth. The daily observations, bands 1-9, have been calibrated to reflectance, scaled to byte data, and geometrically registered to the Albers Equal-Area Conic map projection. The 10th band is a pointer to identify the date and scene ID of the source daily observation (scene) for each pixel. The compositing process required each daily overpass to be registered to a common map projection to ensure that from day to day each 1-km pixel represented the exact same ground location. The Albers Equal-Area Conic map projection provides for equal area representation, which enables easy measurement of area throughout the data. Each daily observation for the growing season was registered to a base image using image-to-image correlation. The NDVI data are calculated from the calibrated, geometrically registered daily observations. The NDVI value is the difference between near-infrared (AVHRR Channel 2) and visible (AVHRR Channel 1) reflectance values divided by total measured reflectance. A maximum NDVI compositing process was used on the daily observations. The NDVI is examined pixel by pixel for each observation during the compositing period to determine and retain the maximum value. Often when displaying data covering large areas, such as AVHRR data, it is beneficial to include an overlay of either familiar linework for reflectance or polygon data sets to derive statistical summaries of regions. All of the linework images represent lines in raster format as 1-km cells and the strata are represented as polygons registered to the AVHRR data. The linework and polygon data sets include international boundaries, Alaskan roads with the Trans-Alaska Pipeline, and a raster polygon mask of the State.

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• AK_AVHRR

USGS_LTA Short Name: AK_AVHRR Version ID: Not provided Unique ID: C1220565954-USGS_LTA

The AMSU/MSU Lowtroposphere Day/Month Temperature Anomalies and Annual Cycle V6 dataset consists of temperature anomalies and annual cycle temperatures derived from the Microwave Sounding Unit (MSU) and the Advanced Microwave Sounding Unit-A (AMSU-A) radiance data since January 1978. All products are derived for the lower troposphere. The dataset begins on January 1, 1978 and is still currently ongoing. The data are available in netCDF-4 and ASCII formats.

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GHRC_CLOUD Short Name: msutlt Version ID: 6 Unique ID: C1625128413-GHRC_CLOUD

The AMSU/MSU Tropopause Day/Month Temperature Anomalies and Annual Cycle V6 dataset consists of temperature anomalies and annual cycle temperatures derived from the Microwave Sounding Unit (MSU) and the Advanced Microwave Sounding Unit-A (AMSU-A) radiance data since January 1978. All products are derived for the tropopause. The dataset begins on January 1, 1978 and is still currently ongoing. The data are available in netCDF-4 and ASCII formats.

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GHRC_CLOUD Short Name: msuttp Version ID: 6 Unique ID: C1625128218-GHRC_CLOUD

Aquarius Level 3 ancillary sea surface temperature (SST) standard mapped image data are the ancillary SST data used in the Aquarius calibration for salinity retrieval. They are simply the daily SSTs from the Reynolds National Climatic Data Center (NCDC) 0.25 degree dataset, gridded and averaged using the Aquarius processing L2-L3 processing scheme to the same 1 degree spatial resolution and daily, 7 day, monthly, 7-Day, and annual time intervals as Aquarius L3 standard salinity and wind speed products. This particular data set is the 28-Day running mean, ancillary sea surface temperature product associated with version 5.0 of the Aquarius data set, which is the official end of mission public data release from the AQUARIUS/SAC-D mission.

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PODAAC Short Name: AQUARIUS_L3_ANCILLARY_SST_SMI_28DAY-RUNNINGMEAN_V5 Version ID: 5.0 Unique ID: C1649547519-PODAAC