Ash fall contour map of the 2009 eruption of Redoubt Volcano, Alaska: Digital shapefiles of contours and sample locations

Metadata also available as - [XML] - [Parseable text]

Frequently-anticipated questions:


What does this data set describe?

Title:
Ash fall contour map of the 2009 eruption of Redoubt Volcano, Alaska: Digital shapefiles of contours and sample locations
Abstract:
The 2009 eruption of Redoubt Volcano included 19 major tephra-producing explosions. Mass per unit area (MPUA) ash fall sampling of the resulting deposits allowed us to create isomass contours of the ash fall. This dataset contains the vector digital shapefiles of the ash fall contours for the explosive events. In addition, a point digital shapefile is included that describes more than 400 ash fall samples that were collected. For a detailed account of the 2009 eruption of Redoubt Volcano, see Schaefer, J.R., ed., 2012, The 2009 eruption of Redoubt Volcano, Alaska, with contributions by Bull, Katharine, Cameron, Cheryl, Coombs, Michelle, Diefenbach, Angie, Lopez, Taryn, McNutt, Steve, Neal, Christina, Payne, Allison, Power, John, Schneider, Dave, Scott, William, Snedigar, Seth, Thompson, Glenn, Wallace, Kristi, Waythomas, Chris, Webley, Peter, and Werner, Cynthia: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2011-5, 45 p., available at <http://www.dggs.alaska.gov/pubs/id/23123>. For a detailed description of the tephra fall deposits, see Wallace, K.L., Schaefer, J.R., and Coombs, M.L., in press, Character, mass, distribution, and origin of tephra-fall deposits from the 2009 eruption of Redoubt Volcano, Alaska—highlighting the importance of particle aggregation: Journal of Volcanology and Geothermal Research.
Supplemental_Information:
As the explosive phase of the 2009 Redoubt eruption began, AVO personnel assigned event numbers to the major ash producig explosions. Explosive events that include more than one event number are composite layers of tephra fall; overlapping deposits or snowpack melt and subsequent combining of tephra fall layers prevented differentiation of the layers in the field. Shapefile names correspond to the event number or event package number. See process steps for more information about event classification. The DGGS metadata standard extends the FGDC standard to also include elements that are required to facilitate our internal data management. These elements, referred to as 'layers', group and describe files that have intrinsic logical or topological relationships. Each layer is listed and described in detail in the Entity and Attributes section of this metadata file. The layers are as follows:
rd-mpua-samples:	tephra sample locations and descriptions
mpua-contour:	isomass contours for event or event package (The files included in this layer are:  mp143-mpua2-4-contour, mp143-mpua5-contour, mp143-mpua6-contour, mp143-mpua7-8-contour, mp143-mpua9-18-contour, mp143-mpua19-contour.)
  1. How should this data set be cited?

    Schaefer, J. R., and Wallace, K. L., 2012, Ash fall contour map of the 2009 eruption of Redoubt Volcano, Alaska: Digital shapefiles of contours and sample locations: Miscellaneous Publication MP 143, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 DVD

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -155.59800000
    East_Bounding_Coordinate: -148.41400000
    North_Bounding_Coordinate: 63.103
    South_Bounding_Coordinate: 59.382

  3. What does it look like?

    <http://www.dggs.alaska.gov/webpubs/dggs/mp/thumbnails/mp143-ashfall_samples_contours_browse.jpg> (JPG)
    unprojected screen shot image of all data layers; ash fall sample locations and isomass contours

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

    Calendar_Date: 2012
    Currentness_Reference: publication date

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

    Geospatial_Data_Presentation_Form: map, digital data

  6. How does the data set represent geographic features?

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

      This is a Vector data set.

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

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    mp143-rd-mpua-samples.shp
    Point shapefile with fields describing station id, sample id, sample descriptions, mass-per-unit-area measurments, ash fall unit assignments, event package assignments and location of samples (Source: This report)

    StationID
    Station Identifier (Source: This report)

    Station Identifier

    SampleID
    Sample Identifier (Source: This report)

    Sample Identifier

    at_num
    USGS Anchorage Tephra Lab Identifier (Source: This report)

    Sample identifier assigned by the USGS Alaska tephra lab; blank field indicates Alaska tephra lab number not assigned

    LocationDe
    General location description (Source: This report)

    General location description. This is not a required field, so some fields are left blank.

    DateVisite
    Date the station was visited (Source: This report)

    Range of values
    Minimum:3/23/2009
    Maximum:7/11/2009

    DateSample
    Date the sample was taken (Source: This report)

    Range of values
    Minimum:3/23/2009
    Maximum:7/11/2009

    SampleType
    Sample type (Source: This report)

    ValueDefinition
    Tephra FallTephra fall deposit

    SampleTy_1
    Sample subtype that further desribes the sample type from the SampleType attribute field (Source: This report)

    Description of sample type

    TextDescri
    Text description of the sample; unedited from geologist's field notes (Source: This report)

    Description of sample; extracted from AVO's sample database where this field has unlimitied text, so some text descriptions may be truncated as a result of transferring the data to shapefile format.

    mpua_gm2
    mass-per-unit-area of tephra fall in grams per square meters (Source: Wallace, K.L., Schaefer, J.R., and Coombs, M.L., in press, Character, mass, distribution, and origin of tephra-fall deposits from the 2009 eruption of Redoubt Volcano, Alaska—highlighting the importance of particle aggregation, Journal of Volcanology and Geothermal Research.)

    Range of values
    Minimum:2
    Maximum:60814
    Units:grams per square meter

    Blank: No MPUA value determined

    FinalUnit
    Explosive event or event package assigned to a sample. Blank entry indicates no event or event package could be assigned. If ash fall could be specifically assigned to an explosive event, the event number or numbers are listed in this field. (Source: This report)

    Where confidently known, the event or event package is listed. Blank field indicate an event or event package could not be determined.

    event_pack
    Explosive event or event package assigned to a sample. (Source: This report)

    ValueDefinition
    uaunassigned. stratigraphy was looked at closely, but an event or event package could not be assigned.

    Explosive event or event package number that was assigned to a sample.

    lat_nad83_
    Latitude, NAD83 datum, decimal degrees (Source: This report)

    Range of values
    Minimum:59.434803
    Maximum:63.06955
    Units:decimal degrees

    long_nad83
    Longitude, NAD83 datum, decimal degrees (Source: This report)

    Range of values
    Minimum:-154.55103
    Maximum:-149.168935
    Units:decimal degrees

    mpua-contour
    The 2009 eruption of Redoubt volcano included 19 major tephra-producing explosions. Mass per unit area (MPUA) ash fall sampling of the resulting deposits allowed us to create isomass contours of the eruption plumes. This dataset contains the vector digital shapefiles of the ashfall contours for the explosive events. Each shapefile is numbered to indicate the eruption or eruption package number. Actual shapefile names are as follows: Event package 2-4 = mp143-mpua2-4_contour; Event 5 = mp143-mpua5-contour; Event 6 = mp143-mpua6-contour; Event package 7-8 = mp143-mpua7-8-contour; Event package 9-18 = mp143-mpua9-18-contour; Event 19 = mp143-mpua19-contour. See attribute accuracy section and entity attribute overview for additional information about eruption event numbering and file naming. (Source: This report)

    CONTOUR
    Isomass contour in grams per square meter (Source: This report)

    ValueDefinition
    visual MODIS extentThe extent to which ash could be visually recognized on snow in MODIS imagery following Event 6, see Entity_and_Attribute_Overview

    label for isomass contour, the numeric value indicates the interpreted surface ash density in grams per square meter

    Entity_and_Attribute_Overview:
    This dataset contains 7 shapefiles; 1 point file and 6 polyline files. The point file rd-mpua-samples, describes the tephra fall samples taken during the 2009 eruption of Redoubt volcano. The other shapefiles are isomass contours of the ash fall produced during the major tephra-producing explosive events. (1) Shapefile mp143-mpua2-4-contour: Isomass contours for Event Package 2-4 (2) Shapefile mp143-mpua5-contour: Isomass contours for Event 5 (3) Shapefile mp143-mpua6-contour: Isomass contours for Event 6 (4) Shapefile mp143-mpua7-8-contour: Isomass contours for Event Package 7-8 (5) Shapefile mp143-mpua9-18-contour: Isomass contours for Event Package 9-18 (6) Shapefile mp143-mpua19-contour: Isomass contours for Event 19 A complete description of the 2009 explosive events can be found in Schaefer, J.R., ed., 2012, The 2009 eruption of Redoubt Volcano, Alaska, with contributions by Bull, K.F., Cameron, C.E., Coombs, M.L., Diefenbach, A.K., Lopez, Taryn, McNutt, S.R., Neal, C.A., Payne, A.L., Power, J.A., Schneider, D.J., Scott, W.E., Snedigar, S.F., Thompson, Glenn, Wallace, K.L., Waythomas, C.F., Webley, P.W., and Werner, C.A.: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2011-5, 45 p. A paper describing the tephra deposits is in press at the time of this writing: Wallace, K.L., Schaefer, J.R., Coombs, M.L., in press, Character, mass, distribution, and origin of tephra-fall deposits from the 2009 eruption of Redoubt Volcano, Alaska—highlighting the importance of particle aggregation, Journal of Volcanology and Geothermal Research.
    Entity_and_Attribute_Detail_Citation: This report


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?

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

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    GIS Data Manager/GIS Analyst
    3354 College Road
    Fairbanks, AK 99709-3707

    (907) 451-5029 (voice)
    (907) 451-5050 (FAX)
    dggsgis@alaska.gov

    Contact_Instructions:
    You may view our web site at <http://www.dggs.alaska.gov> for the latest information on available data. Please e-mail your questions and data requests when possible.


Why was the data set created?

The purpose of this publication is to provide digital GIS files of ash fall isomass contour data, ash fall sample locations, event package assignments, and mass per unit area measurements for the ash fall that occurred during the 2009 eruption of Redoubt Volcano. These GIS files represent the data used to create Figure 12, on p.13 in Schaefer, J.R., ed., 2012, The 2009 eruption of Redoubt Volcano, Alaska, with contributions by Bull, Katharine, Cameron, Cheryl, Coombs, Michelle, Diefenbach, Angie, Lopez, Taryn, McNutt, Steve, Neal, Christina, Payne, Allison, Power, John, Schneider, Dave, Scott, William, Snedigar, Seth, Thompson, Glenn, Wallace, Kristi, Waythomas, Chris, Webley, Peter, and Werner, Cynthia: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2011-5, 45 p., available at <http://www.dggs.alaska.gov/pubs/id/23123>.


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: Mar-2009 (process 1 of 5)
    Ash fall collection - Field samples of ash fall and mass per unit area (MPUA) measurements were collected during the 2009 eruption of Redoubt Volcano as described in Wallace, K.L, and others, in press.

    Date: 2009 (process 2 of 5)
    MODIS imagery analysis of ash fall - MODIS imagery was downloaded from the Geographic Information Network of Alaska (GINA) website, <http://www.gina.alaska.edu/>. Before and after ash fall images were analyzed for visual indications of dark ash on white snow. Areas of ash fall were digitized in MapInfo GIS at a course scale of approximately 1:900,000. MODIS imagery acquired throughout the eruption provided a visual picture of both ash deposition (dark gray ash on white snow) as well as ash clouds in the atmosphere. A custom projection was created in MAPINFO to accommodate the MODIS imagery native projection of the following: Driver: GTiff/GeoTIFF Size is 10000, 10000 Coordinate System is: PROJCS["unnamed", GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.2572235630016, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4326"]], PROJECTION["Lambert_Azimuthal_Equal_Area"], PARAMETER["latitude_of_center",60.8], PARAMETER["longitude_of_center",-147.8], PARAMETER["false_easting",0], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]]] Origin = (-1250000.000000,1250000.000000) Pixel Size = (250.00000000,-250.00000000) Metadata: AREA_OR_POINT=Area Corner Coordinates: Upper Left (-1250000.000, 1250000.000) (179d22'52.86"E, 69d 4'59.06"N) Lower Left (-1250000.000,-1250000.000) (164d40'48.43"W, 48d 8'20.81"N) Upper Right ( 1250000.000, 1250000.000) (114d58'52.86"W, 69d 4'59.06"N) Lower Right ( 1250000.000,-1250000.000) (130d55'11.57"W, 48d 8'20.81"N) Center ( 0.0000000, 0.0000000) (147d48'0.00"W, 60d48'0.00"N) Band 1 Block=10000x1 Type=Byte, ColorInterp=Red Band 2 Block=10000x1 Type=Byte, ColorInterp=Green Band 3 Block=10000x1 Type=Byte, ColorInterp=Blue

    An ArcGIS world file (tfw) was also created with the followig parameters: 250 0 0 -250 -1249875 1249875

    Date: 2012 (process 3 of 5)
    Radar reflectivity data analysis - FAA NEXRAD base reflectivity data was converted to GIS shapefiles using NOAA's Weather and Climate Toolkit. Above background reflectivity data was digitized in a GIS to encompass all ash signals in the atmosphere. This NEXRAD data was used to target field sites for tephra collection, provided plume size, location, and trajectory information, and was used to interpret time-stratigraphic relationships of ash fall layers.

    Date: 2009 (process 4 of 5)
    Isomass contour construction - Our final interpretation of the shape and value of the isomass contours results from the integrative analysis of the location and value of mass-per-unit-area (MPUA) samples, ash seen in MODIS imagery, and ash in the atmosphere interpreted from NEXRAD base reflectivity data. All three of these datasets (MPUA value and location, MODIS-interpreted ash and snowfall, and NEXRAD-interpreted ash and snowfall) were plotted together in a GIS to construct the contours using a projection of NAD_1983_UTM_Zone_5N. Contour values are based on the actual MPUA values of the ash fall samples. The sample density, quality and timing of visual MODIS data, and occasional stratigraphic complexities result in varying degrees of certainty in the location and value of the isomass contours. These uncertainties are described in detail for each event or event package in the Attribute Accuracy Report section of this metadata file.

    Date: Feb-2012 (process 5 of 5)
    All isomass contour layers and sample locations were reprojected to Geographic NAD83 in ArcGIS for distribution

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

    Wallace, K.L., Schaefer, J.R., and Coombs, M.L., Unknown, Character, mass, distribution, and origin of tephra-fall deposits from the 2009 eruption of Redoubt Volcano, Alaska—highlighting the importance of particle aggregation: Journal of Volcanology and Geothermal Research in press.

    Schaefer, Janet R., 2012, The 2009 eruption of Redoubt Volcano, Alaska, with contributions by Bull, K.F., Cameron, C.E., Coombs, M.L., Diefenbach, A.K., Lopez, Taryn, McNutt, S.R., Neal, C.A., Payne, A.L., Power, J.A., Schneider, D.J., Scott, W.E., Snedigar, S.F., Thompson, Glenn, Wallace, K.L., Waythomas, C.F., Webley, P.W., and Werner, C.A.: Report of Investigation RI 2011-5, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 45 p.


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

  1. How well have the observations been checked?

    Isomass contours for all depositional event packages are based on three datasets: (1) mass-per-unit-area (MPUA) measurement of tephra samples, (2) ash on the ground as seen in MODIS imagery, and (3) FAA NEXRAD base reflectivity data. Tephra samples with MPUA measurements were used to define the contour location and contour values of each depositional event package. MODIS imagery acquired throughout the eruption provided a visual picture of both ash deposition (dark gray ash on white snow) as well as ash clouds in the atmosphere. All 19 ash-producing explosive events were mapped in a GIS using the NEXRAD base reflectivity data. This NEXRAD data was used to target field sites for tephra collection, provide plume size, location, and trajectory information, and interpret time-stratigraphic relationships of ash fall layers. Our final interpretation of the shape and value of the isomass contours results from the integrative analysis of all three of these datasets. The sample density, quality and timing of visual MODIS data, and occasional stratigraphic complexities results in varying degrees of certainty in the location and value of the isomass contours. To better define this qualitative uncertainty, a description of how the data was used to define the contours for each event package is summarized below. Event Package 2-4 (mp143-mpua2-4-contour): The value of the contours for event package 2-4 is defined by 32 samples collected between about 9 and 240 km from the vent. The overall shape of the contours is based on this sample data, a March 23 MODIS image showing ash on snow, and NEXRAD data. The 10 g/m2 boundary is highly uncertain, due to both lack of sample density and the difficulty in distinguishing the ash on snow versus lowland vegetation in the MODIS image. The construction of contours within about 70 km of the vent was inhibited by the deposition of Event 5 tephra directly on top of Event 4 tephra. In some cases, enough snow fell between events 4 and 5 to distinguish the deposits, however in some cases a composite sample had to be taken. The NEXRAD base reflectivity clearly defines a northeast trajectory that progressively moves northwestward with each successive explosion and this data was critical in determining the stratigraphic relationship of the samples collected and in understanding the mass-per-unit area values obtained. Event 5 (mp143-mpua5-contour): The shape and location of the outer 10 g/m2 contour for Event 5 is based on NEXRAD base reflectivity data showing the plume trajectory, as well as a MODIS image showing ash on the snow. The MODIS image was acquired on March 23, 2009, at 13:49 AKDT, approximately 9 hours after the Event 5 explosion, and clearly shows fresh ash on snow. The value assigned to this outer contour is well-defined by 17 MPUA samples collected within the northeastern lobe of ash fall, between 200 and 300 km from the vent. Twenty other samples taken closer to the vent define the 100 g/m2 and 1,000 g/m2 contours. Event 6 (mp143-mpua6-contour): Nineteen MPUA samples are assigned to Event 6 and are used to define the 20,000 g/m2, 3,000 g/m2, and 400 g/m2 contours. The outer line, with an unassigned value, marks the outer boundary of ash on snow seen in two MODIS images: March 24, 2009, at 12:54pm AKDT, and March 26, 2009, at 12:41pm AKDT. Even though ash could be seen on the snow in the MODIS images, we were unable to collect distal samples in the region so this area could not be included in the contouring and derivative volume calculation for Event 6. Event Package 7-8 (mp143-mpua7-8-contour): Event 7 was small compared to Event 8 and ash from this event was immediately covered by Event 8 deposits within about 20 km of the vent making the deposits from these two explosions indistinguishable within this area. All tephra collected on March 26 across Cook Inlet along the road system between Soldotna and Seldovia (~90-120 km from the vent) are Event 8 deposits. A total of 26 MPUA samples define the Event Package 7-8 contours. Much of the tephra from Event 8 fell into Cook Inlet so sampling density is sparse along the southeast-directed plume axis between about 40 and 70 km from the vent. A lack of sample density made it difficult to close the 10 and 2 g/m2 contours so open ended lines are drawn to designate approximate isomass contours between Ninilchik and Anchorage. Two MODIS images on March 26 clearly show ash deposition along the entire length of the Crescent River valley and lingering ash in the atmosphere for more than 300 km to the southeast along the plume trajectory as well as 300 km to the northeast in the upper Cook Inlet over Anchorage. Event Package 9-18 (mp143-mpua9-18-contour): Overlapping east-northeast trajectories, combined with little snowfall between Events 9 through 18, made it impossible to distinguish these events stratigraphically. A total of 58 samples are used to define event package 9-18 contours. NEXRAD data for all events helped constrain the shape of each contour. This is especially true for the northern and northeastern section of the 10 g/m2 contour where sample density is sparse. Here the contour encloses the area of high NEXRAD base reflectivity following Event 18. Event 19 (mp143-mpua19-contour): In eight near-vent locations within 30 km of the vent, Event 19 tephra was deposited directly on Event 8 tephra, so MPUA samples in these locations represent a composite of both Events 8 and 19. Seven other near-vent locations can be properly distinguished as Event 19, as well as ten other Event 19 samples that were collected the day of deposition across Cook Inlet on the road system between Ninilchik and Homer. The path of Event 19 airborne ash as well as ground deposition is easily seen in April 4 MODIS imagery. As with Event 8, sample density was limited due to deposition of ash in Cook Inlet, but the 10 distal samples combined with the eight proximal samples allow us to confidently construct four isomass contours.

  2. How accurate are the geographic locations?

    Latitude and longitude locations of tephra fall samples were acquired with a hand-held GPS with a standard accuracy of approximately 10 to 20 meters. See Attribute Accuracy Report for a description of the uncertainties involved with the creation of the isomass contours.

  3. How accurate are the heights or depths?

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

    Although several hundred geologic samples were collected during the 2009 Redoubt eruption, the sample descriptions included in this report consist only of tephra fall samples where a specific ash fall event or event package determination could be made. If ash fall could be specifically assigned to an explosive event, the event number or numbers are listed in the field 'FinalUnit' of shapefile: mp143-rd-mpua-samples.

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

    Positional accuracy was checked by plotting sample locations and contours in a GIS and comparing placed points and contours with topography and map attributes.


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 dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data 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 or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

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

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    907-451-5020 (voice)
    907-451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (<http://www.dggs.alaska.gov>) 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?

    MP 143

  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?


Who wrote the metadata?

Dates:
Last modified: 13-Mar-2012
Metadata author:
Metadata manager
3354 College Road
Fairbanks, AK 99709-3707
USA

907-451-5020 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.6 on Tue Mar 20 16:20:39 2012