TOPS Alaska 1km Climate

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: NASA Ames Ecological Forecasting Lab
Publication_Date: 201110
Title:
TOPS Alaska 1km Climate
Edition: 1.1
Geospatial_Data_Presentation_Form: raster digital data
Online_Linkage: http://ecocast.arc.nasa.gov/
Description:
Abstract:
This dataset was produced by the Ecological Forecasting Lab at NASA Ames Research Center for use by the Yellowstone Ecological Research Center (YERC) and partners in research to develop and apply predictive species models to evaluate current and future changes in the range of individual species in response to changes in the land surface. The NASA Terrestrial Observation and Prediction System (TOPS) was applied to produce satellite data composites from the MODerate resolution Imaging Spectroradiometer (MODIS) onboard the Terra satellite, interpolated meteorological surfaces, and modeled data products for Alaska. This metadata file describes the meteorological surfaces produced by TOPS. For more information on TOPS, please see http://ecocast.arc.nasa.gov. For more information about ongoing modeling work at YERC, please see http://www.yellowstoneresearch.org/.
Purpose:
This dataset was compiled for research and evaluation purposes only. This data is intended solely for use in modeling studies to understand and predict potential drivers of recent and future changes in ecosystem boundaries and the range of individual species.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19800101
Ending_Date: 20091231
Currentness_Reference:
observed
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Description_of_Geographic_Extent:
Alaska
Bounding_Coordinates:
West_Bounding_Coordinate: 177.830
East_Bounding_Coordinate: -114.36
North_Bounding_Coordinate: 69.709
South_Bounding_Coordinate: 51.206
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Climate
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: temperature
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: precipitation
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: radiation
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: vapor pressure deficit
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Alaska
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 1980-2009
Access_Constraints: None
Use_Constraints:
None
Data_Set_Credit:
NASA Ames Ecological Forecasting Lab
Mail Stop 232-21
Moffett Field, CA 94035
Analytical_Tool:
Analytical_Tool_Description:
See http://ecocast.arc.nasa.gov/topwp/
Tool_Access_Information:
Tool_Access_Instructions:
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
TOPS meteorological surfaces for maximum temperature, minimum temperature, and precipitation are evaluated via a cross-validation analysis in which each meteorological station is removed from the dataset, and the remaining stations are used to estimate the value for the grid cell which contains the station (please see Jolly et al., 2005 for a full technical description of the cross-validation method, http://ecocast.arc.nasa.gov/pubs/pdfs/2005/Jolly_SOGS.PDF). The observed value is compared against the interpolated value, and this process is repeated for all stations for each day in the dataset. The average error for the meteorological surface is calculated on a daily basis as the mean absolute error for all stations used to produce to the meteorological surface. These error reports are produced as separate text files associated with each daily data file for the maximum temperature, minimum temperature, and precipitation surfaces. Observations of vapor pressure deficit and shortwave radiation are usually not widely available. Errors may be expected to fall within the range of those reported by Thornton et al. (1999), and if observations of vapor pressure deficit and shortwave radiation are available for the region of interest, additional validation is recommended for these parameters prior to use.
Logical_Consistency_Report:
Data from 1980-2009 was produced at an 1km resolution by the NASA Ames Ecological Forecasting Lab. Precipitation for 2006-2009 were generated using fewer meteorological base stations than the earlier years. The baseline files (i.e., the daily average values used for anomaly calculations) for all variables are 30-year averages calculated on a per-day basis.
Completeness_Report:
Missing files:
Data files are missing on the dates listed below.

Maximum Temperature:
5/4/1986
10/14/2066

Minimum Temperature:
6/10/1985
6/11/1985
6/12/1985
6/13/1985
6/14/1985
6/15/1985
6/16/1985
6/17/1985
6/18/1985
6/19/1985
6/20/1985
6/21/1985
6/22/1985
3/14/1988
10/14/2006

Vapor pressure deficit:
6/16/1984
6/10/1985
6/11/1985
6/12/1985
6/13/1985
6/14/1985
6/15/1985
6/16/1985
6/17/1985
6/18/1985
6/19/1985
6/20/1985
6/21/1985
3/14/1988
10/8/1993
10/14/2006

Shortwave radiation:
6/16/1984
6/10/1985
6/11/1985
6/12/1985
6/13/1985
6/14/1985
6/15/1985
6/16/1985
6/17/1985
6/18/1985
6/19/1985
6/20/1985
6/21/1985
3/14/1988
10/14/2006



All Variables - (08/28/2007), Srad and VPD (07/29/2005)
Lineage:
Process_Step:
Process_Description:
TOPS meteorological surfaces are produced using the Surface Observation and Gridding System (please see Jolly et al., 2005 for a full technical description of SOGS, http://ecocast.arc.nasa.gov/pubs/pdfs/2005/Jolly_SOGS.PDF). SOGS employs a modified version of the DAYMET algorithms developed by Thornton et al. (1997) and Thornton et al. (1999). Daily meteorological observations from surface meteorological stations are retrieved by SOGS and all available, high quality observations available for each day are used to produce the interpolated meteorological surfaces for maximum temperature, minimum temperature, precipitation, vapor pressure deficit and shortwave radiation. The raw data provided by NASA Ames Ecological Forecasting Lab were converted from their native 32-bit floating point format (.flt32) to GeoTIFFs (.tif) using an ENVI/IDL script.
Process_Date: 20110505
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 2168
Column_Count: 2537
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Azimuthal Equal Area
Lambert_Azimuthal_Equal_Area:
Longitude_of_Projection_Center: -150.00000
Latitude_of_Projection_Center: 65.00000
False_Easting: 0
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 1000
Ordinate_Resolution: 1000
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Spheroid
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 0
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Minimum Temperature
Entity_Type_Definition:
Interpolated surface for daily minimum temperature (degrees C)
Entity_Type_Definition_Source:
TOPS Surface Observation Gridding System
Detailed_Description:
Entity_Type:
Entity_Type_Label: Maximum Temperature
Entity_Type_Definition:
Interpolated surface for daily maximum temperature (degrees C)
Entity_Type_Definition_Source:
TOPS Surface Observation Gridding System
Detailed_Description:
Entity_Type:
Entity_Type_Label: Precipitation
Entity_Type_Definition:
Interpolated surface for daily total precipitation (mm)
Entity_Type_Definition_Source:
TOPS Surface Observation Gridding System
Detailed_Description:
Entity_Type:
Entity_Type_Label: Shortwave Radiation
Entity_Type_Definition:
Interpolated surface for incident shortwave radiation (W/M^2)
Entity_Type_Definition_Source:
TOPS Surface Observation Gridding System
Detailed_Description:
Entity_Type:
Entity_Type_Label: Vapor Pressure Deficit
Entity_Type_Definition:
Interpolated surface for vapor pressure deficit (Pa)
Entity_Type_Definition_Source:
TOPS Surface Observation Gridding System
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Metadata_Reference_Information:
Metadata_Date: 20120219
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NASA Ames Ecological Forecasting Lab
Contact_Address:
Address_Type: mailing
Address: Mail Stop 232-21
City: Moffett Field
State_or_Province: CA
Postal_Code: 94035
Contact_Voice_Telephone: 650-604-2787
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001.1-1999
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