Gridded Wind Parameters of Southeast Alaska

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Frequently-anticipated questions:


What does this data set describe?

Title: Gridded Wind Parameters of Southeast Alaska
Abstract:
This file was created using the MesoMap system which consists of an integrated set of atmospheric simulation models, databases, and computers and storage systems. At the core of MesoMap is MASS (Mesoscale Atmospheric Simulation System), a numerical weather model, which simulates the physics of the atmosphere. MASS is coupled to a simpler wind flow model, WindMap, which is used to refine the spatial resolution of MASS and account for simple localized effects of terrain and surface roughness. MASS simulates weather conditions over a region for 366 historical days randomly selected from a 15-year period. When the runs are finished, the results are input into WindMap. Truewind subsequently validates the wind maps. In addition to the raster wind maps that are created, the final product is a grid of points each containing values for various wind parameters. The points are spaced at 2 kilometers apart and include predicted wind speed frequency distribution, and speed and energy in 16 directions. This information is necessary for the production of a wind rose image at a given point.
Supplemental_Information:
The layers listed below are available as ArcGIS shape files and in Google Earth format. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Layers include:
AK_SE_rose     predicted wind speed frequency distribution, wind speed, and wind energy in 16 directions (Southeast Alaska)
  1. How should this data set be cited?

    AWS Truewind, LLC, and Authority, Alaska Energy , 2006, Gridded Wind Parameters of Southeast Alaska: Wind Energy WND 2006-2B, State of Alaska, Department of Commerce, Community & Economic Development, Alaska Energy Authority, Anchorage, AK.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -141.640039
    East_Bounding_Coordinate: -127.996348
    North_Bounding_Coordinate: 60.648682
    South_Bounding_Coordinate: 54.153350

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 2006
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 7
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: 141.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.008192
      Ordinates (y-coordinates) are specified to the nearest 0.008192
      Planar coordinates are specified in meters

      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

  7. How does the data set describe geographic features?

    AK_SE_rose.shp
    Object type is vector, describing predicted wind speed frequency distribution, wind speed, and wind energy in 16 directions (Southeast Alaska) (Source: AWS Truewind, LLC)

    X
    UTM easting coordinate, Zone 7, WGS_1984 (Source: AWS Truewind, LLC)

    Range of values
    Minimum:466900
    Maximum:1216900
    Units:m

    Y
    UTM northing coordinate, Zone 7, WGS_1984 (Source: AWS Truewind, LLC)

    Range of values
    Minimum:6057700
    Maximum:6691700
    Units:m

    Longitude
    Longitude coordinate, WGS_1984 (Source: AWS Truewind, LLC)

    Range of values
    Minimum:-141.6
    Maximum:-129.639
    Units:decimal degree

    Latitude
    Latitude coordinate, WGS_1984 (Source: AWS Truewind, LLC)

    Range of values
    Minimum:54.391
    Maximum:60.349
    Units:decimal degree

    FILE
    File name of the corresponding wind rose image (Source: AWS Truewind, LLC)

    Name assigned to each wind rose image in JPEG format. Naming format is AK####_####.JPG where the numbers most likely correspond to the location's relative position on the larger grid.

    FREQ1
    Percent Frequency (N direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ2
    Percent Frequency (NNE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ3
    Percent Frequency (NE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ4
    Percent Frequency (ENE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ5
    Percent Frequency (E direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ6
    Percent Frequency (ESE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ7
    Percent Frequency (SE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ8
    Percent Frequency (SSE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ9
    Percent Frequency (S direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ10
    Percent Frequency (SSW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ11
    Percent Frequency (SW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ12
    Percent Frequency (WSW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ13
    Percent Frequency (W direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ14
    Percent Frequency (WNW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ15
    Percent Frequency (NW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    FREQ16
    Percent Frequency (NNW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    SPEED1
    Wind Speed Ratio (N direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED2
    Wind Speed Ratio (NNE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED3
    Wind Speed Ratio (NE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED4
    Wind Speed Ratio (ENE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED5
    Wind Speed Ratio (E direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED6
    Wind Speed Ratio (ESE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED7
    Wind Speed Ratio (SE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED8
    Wind Speed Ratio (SSE direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED9
    Wind Speed Ratio (S direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED10
    Wind Speed Ratio (SSW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED11
    Wind Speed Ratio (SW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED12
    Wind Speed Ratio (WSW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED13
    Wind Speed Ratio (W direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED14
    Wind Speed Ratio (WNW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED15
    Wind Speed Ratio (NW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    SPEED16
    Wind Speed Ratio (NNW direction) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:Dimensionless

    POWER1
    Percent Wind Power Density (direction N) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER2
    Percent Wind Power Density (direction NNE) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER3
    Percent Wind Power Density (direction NE) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER4
    Percent Wind Power Density (direction ENE) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER5
    Percent Wind Power Density (direction E) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER6
    Percent Wind Power Density (direction ESE) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER7
    Percent Wind Power Density (direction SE) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER8
    Percent Wind Power Density (direction SSE) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER9
    Percent Wind Power Density (direction S) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER10
    Percent Wind Power Density (direction SSW) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER11
    Percent Wind Power Density (direction SW) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER12
    Percent Wind Power Density (direction WSW) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER13
    Percent Wind Power Density (direction W) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER14
    Percent Wind Power Density (direction WNW) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER15
    Percent Wind Power Density (direction NW) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    POWER16
    Percent Wind Power Density (direction NNW) (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:100
    Units:percent

    WEIBC1
    Weibull C (direction N): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC2
    Weibull C (direction NNE): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC3
    Weibull C (direction NE): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC4
    Weibull C (direction ENE): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC5
    Weibull C (direction E): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC6
    Weibull C (direction ESE): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC7
    Weibull C (direction SE): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC8
    Weibull C (direction SSE): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC9
    Weibull C (direction S): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC10
    Weibull C (direction SSW): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC11
    Weibull C (direction SW): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC12
    Weibull C (direction WSW): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC13
    Weibull C (direction W): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC14
    Weibull C (direction WNW): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC15
    Weibull C (direction NW): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBC16
    Weibull C (direction NNW): weighted average speed. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:3
    Units:m/s

    WEIBK1
    Weibull K (direction N): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK2
    Weibull K (direction NNE): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK3
    Weibull K (direction NE): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK4
    Weibull K (direction ENE): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK5
    Weibull K (direction E): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK6
    Weibull K (direction ESE): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK7
    Weibull K (direction SE): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK8
    Weibull K (direction SSE): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK9
    Weibull K (direction S): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK10
    Weibull K (direction SSW): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK11
    Weibull K (direction SW): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK12
    Weibull K (direction WSW): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK13
    Weibull K (direction W): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK14
    Weibull K (direction WNW): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK15
    Weibull K (direction NW): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    WEIBK16
    Weibull K (direction NNW): shape parameter, specifies how sharp a peak the curve has. See <http://nswep.electricalcomputerengineering.dal.ca/tools/weibull.html> for more information. (Source: AWS Truewind, LLC)

    Range of values
    Minimum:0
    Maximum:4
    Units:Dimensionless

    Rose
    Indicates which records have an associated wind rose image (Source: AWS Truewind, LLC)

    ValueDefinition
    0Record has an associated wind rose image
    1Record does not have an associated wind rose image

    Hyperlink
    Indicates relative directory location of each wind rose image; often set up as a GIS hyperlink for each point in the grid (Source: AWS Truewind, LLC)

    Name and directory assigned to each wind rose image in JPEG format. Naming format is WindRose\AK####_####.JPG where the numbers most likely correspond to the location's relative position on the larger grid.


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    AWS Truewind, LLC

  3. To whom should users address questions about the data?

    AWS Truewind
    c/o Michael Brower
    463 New Karner Road
    Albany, New York 12205
    United States

    (518) 213-0044 (voice)


Why was the data set created?

The purpose of creating this file was to use MesoMap to create high-resolution wind maps and to provide wind resource data in a format enabling the assessment of potential wind development sites in a GIS. By combining a sophisticated numerical weather model capable of simulating large-scale wind patterns with a microscale wind flow model responsive to local terrain and surface conditions, they enable the mapping of wind resources with much greater accuracy than has been possible in the past. In addition, they do not require surface wind data to make accurate predictions. While on-site measurements will be required to confirm the predicted wind resource at any particular location, mesoscale-microscale modeling can greatly reduce the time and cost required to identify and evaluate potential wind project sites.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: 2006 (process 1 of 4)
    The MesoMap system creates a wind resource map in several steps. First, the MASS model simulates weather conditions over 366 days selected from a 15-year period. The days are chosen through a stratified random sampling scheme so that each month and season is represented equally in the sample; only the year is randomized. Each simulation generates wind and other weather variables (including temperature, pressure, moisture, turbulent kinetic energy, and heat flux) in three dimensions throughout the model domain, and the information is stored at hourly intervals. When the runs are finished, the results are compiled into summary data files, which are then input into the WindMap program for the final mapping stage. The two main products are usually (1) color-coded maps of mean wind speed and power density at various heights above ground and (2) data files containing wind speed and direction frequency distribution parameters. For the standard MesoMap configuration MASS is run on the following nested grids: First (outer) grid level: 30 km, Second (intermediate) grid level: 8 km, Third (inner) grid level: 2.5 km.

    Person who carried out this activity:

    Brower, Michael
    AWS Truewind, LLC
    Principal
    463 New Karner Road
    Albany, New York 12205
    United States

    (518) 213-0044 (voice)

    Date: 2006 (process 2 of 4)
    Metadata imported.

    Date: 2006 (process 3 of 4)
    Written summary of the data processing procedures that are performed on the raw measured data in order to create an annual dataset of "typical" wind speeds, which could then be used to calculate potential power production from wind turbines. There are various methods and reasons for adjusting the raw data, so the purpose of these notes is to document what is typically done in AEA reports. See the associated PDF file, <http://akenergyinventory.org/metadata/WND2006_process.pdf> for more information.

    Person who carried out this activity:

    Jensen, James
    AEA
    Project Manager
    813 W. Northern Lights Blvd.
    Anchorage, AK, Alaska 99503
    United States

    (907) 771-3043 (voice)

    Date: 2009 (process 4 of 4)
    Formal FGDC metadata (this document) was rewritten for the entire AK wind dataset (K.R. Papp, AEA, 18-Jun, 2009). The dataset will be viewable/distributed online via the Alaska Energy Data Inventory (<http://akenergyinventory.org>) project.

  3. What similar or related data should the user be aware of?

    AWS Truewind, LLC, and Authority, Alaska Energy , 2006, High-resolution Wind Resource Maps of Alaska: Wind Energy WND 2006-1A, State of Alaska, Department of Commerce, Community & Economic Development, Alaska Energy Authority, Anchorage, AK.

    Online Links:

    AWS Truewind, LLC, and Authority, Alaska Energy , 2006, High-resolution Wind Resource Maps of Southeast Alaska: Wind Energy WND 2006-2A, State of Alaska, Department of Commerce, Community & Economic Development, Alaska Energy Authority, Anchorage, AK.

    Online Links:

    AWS Truewind, LLC, and Authority, Alaska Energy , 2006, Gridded Wind Parameters of Alaska: Wind Energy WND 2006-1B, State of Alaska, Department of Commerce, Community & Economic Development, Alaska Energy Authority, Anchorage, AK.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Raster cell values of the average wind speed (m/s) and wind power (W/m^2) density were computed from the MASS (Mesoscale Atmospheric Simulation System), a numerical weather model, which simulates the physics of the atmosphere. The maps and data can then be compared with land and ocean surface wind measurements, and if significant discrepancies are observed, adjustments to the wind maps can be made. The usual geophysical and meteorological inputs were used. The WindMap program adjusted the wind resource estimates to reflect local topography and surface roughness changes on a grid spacing of 200 m. For the topographical data, we used the National Elevation Dataset, a digital terrain model produced on a 30 m grid by the US Geological Survey (USGS). For the land cover, we used the National Land Cover Dataset, which is derived from Landsat imagery. It was also produced by the USGS on a 30 m grid. In converting from land cover to surface roughness, certain roughness length values were assumed to be typical of conditions in the region. The displacement height is defined as the height at which the wind speed becomes zero in the logarithmic shear formula. For this project, we assumed that the displacement height was 10 times the surface roughness length, which was in turn defined to be approximately 7.5% of the vegetation height. For deciduous forests with a roughness length of 0.9 m, this resulted in a displacement height of 9 m.

  2. How accurate are the geographic locations?

    The WindMap program adjusted the wind resource estimates to reflect local topography and surface roughness changes on a grid spacing of 200 m. The data presented in this data set, however, are spaced at 2-km intervals.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    The shaded raster images display the average wind speed (m/s) and wind power (W/m^2) density for a large portion of mainland Alaska (North Slope and the Aleutians not included).

  5. How consistent are the relationships among the observations, including topology?

    MASS is coupled to a simpler wind flow model, WindMap, which is used to refine the spatial resolution of MASS and account for simple localized effects of terrain and surface roughness. MASS simulates weather conditions over a region for 366 historical days randomly selected from a 15-year period. When the runs are finished, the results are input into WindMap. Truewind subsequently validates the wind maps.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This report, map, and/or data set have been published as part of the Alaska Energy Data Inventory (AEDI) project. The vector layers may be accessed and downloaded at the user's convenience. All of the data are available directly from AWS Truewind, LLC.
Use_Constraints:
This data was created by AWS Truewind using the MesoMap system and historical weather data. Although it is believed to represent an accurate overall picture of the wind energy resource, estimates at any location should be confirmed by measurement. Please site AWS Truewind, LLC when using this data.

  1. Who distributes the data set? (Distributor 1 of 1)

    State of Alaska, Department of Commerce, Community & Economic Development, Alaska Energy Authority
    Wind Program Manager
    813 W. Northern Lights Blvd.
    Anchorage, AK 99504
    USA

    907-771-3043 (voice)
    907-771-3044 (FAX)
    jjensen@aidea.org

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our web site (<http://akenergyinventory.org>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set?

    Wind Energy 2006-2B

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    ESRI ArcGIS 9.+, MapInfo, and/or Google Earth. Please check the MapInfo web site (<http://www.mapinfo.com/>) for the latest documentation on importing ESRI shape files.


Who wrote the metadata?

Dates:
Last modified: 23-Jun-2009
Last Reviewed: 23-Jun-2009
To be reviewed: 23-Jun-2011
Metadata author:
State of Alaska, Department of Commerce, Community & Economic Development, Alaska Energy Authority
Energy Data Project Manager
813 W. Northern Lights Blvd.
Anchorage, AK 99504
USA

907-771-3049 (voice)
907-451-5050 (FAX)
kpapp@aidea.org

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays.
Contact_Instructions:
Please contact us through the e-mail address above whenever possible.
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.8 on Wed Jun 24 20:48:29 2009