Malaeimi Special Management Area

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Frequently-anticipated questions:

What does this data set describe?

Title: Malaeimi Special Management Area
Abstract:
Almost all of the drinking water for residents of Tutuila is supplied by underground aquifers, and a majority of the groundwater is pumped from the Tafuna-Leone Plain. A critical recharge region for this aquifer is the Malaeimi Valley. The American Samoa Environmental Protection Agency (ASEPA) and American Samoa Coastal Zone Management Program (ASCMP) are proposing to designate the Malaeimi Valley as a Special Management Area (SMA), which will protect this critical recharge zone. One key step in the SMA designation process is precisely mapping the proposed region.
  1. How should this data set be cited?

    American Samoa Environmental Protection Agency, 5-2003, Malaeimi Special Management Area: ASEPA, Utulei, American Samoa.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -170.744435
    East_Bounding_Coordinate: -170.723941
    North_Bounding_Coordinate: -14.297852
    South_Bounding_Coordinate: -14.320795

  3. What does it look like?

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

    Calendar_Date: 2003
    Currentness_Reference: ground condition

  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?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • G-polygon (1)
      • Point (4)

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

      The map projection used is Transverse Mercator.

      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -171.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 10000000.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000004
      Ordinates (y-coordinates) are specified to the nearest 0.000004
      Planar coordinates are specified in meters

      The horizontal datum used is D_North_American_1983_HARN.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:

  7. How does the data set describe geographic features?

    tut_malaeimi_sma
    Malaeimi Special Management Area (Source: American Samoa Environmental Protection Agency)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    ID
    Polygon unique ID number

    Area
    Area of polygon in square meters (Source: XTOOLS 3.0 for ArcGIS 8.3)

    Perimeter
    Perimeter of polygon in meters. (Source: XTOOLS 3.0)

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?

    American Samoa Environmental Protection Agency
    Water Program
    American Samoa Environmental Protection Agency, PO Box PPA
    Pago Pago, AS 96799
    USA

    011-684-633-2304 (voice)
    011-684-633-5175 (FAX)
    amsamoaepa@yahoo.com

    Hours_of_Service: Monday - Friday, 7:30 a.m. to 4:00 p.m., -11 hours GMT

Why was the data set created?

The purpose of creating this GIS map is to clearly define the boundaries of the proposed SMA region. A detailed map will allow wise management and planning decisions affecting the future of the Malaeimi Valley.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    United States Geological Survey, 1963, tut_contour10m.shp: USGS, Reston, VA.

    Online Links:

    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: Tutuila Digital Elevation Model
    Source_Contribution: United States Geological Survey

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

    Date: Apr-2003 (process 1 of 5)
    Field survey was carried out on 17-18 April 2003 by McConnel Dowell Company to accurately position 6 concrete plinths (constructed previously) situated along Highway 1 within the EPA Special Management Area (SMA). Positioning of plinths was to be in terms of the American Samoa Datum 1962. A field traverse commencing from Pavaiai Village (utilizing Trig Pavaiai 285093.02N, 234543.59E and Trig. Olotele 291477.39N, 229918.35E) to the concrete plinths in the Malaemi Valley was made to determine the correct plan location of the plinths. This traverse was carried out using a Sokkia Powerset 3000 Total Station. Vertical determination of the plinths was by level traverse from Trig Pavaiai (elevation 253.10) with Universal A1 Automatic Optical Level. The first points of the ridge enclosing the SMA (on both the eastern and western ends) were located in plan using horizontal angles shot from two or more plinths on the desired ridge position. The remainder of the ridge was determined by tracing a topographical map by hand to determine bearing and distance of lines that would enclose the SMA around the ridge line.

    The remainder of the ridge that was determined by tracing a topographical map by hand was updated by GIS staff at the American Samoa Department of Commerce using a 10 meter contour interval ESRI shapefile. The 10 meter contour shapefile was derived from a United States Geological Survey Digital Elevation Model using the spatial analyst extension in ArcGIS 8.2.

    Person who carried out this activity:

    American Samoa Environmental Protection Agency
    Water Program
    American Samoa Environmental Protection Agency, PO Box PPA
    Pago Pago, AS 96799
    USA

    011-684-633-2304 (voice)
    011-684-633-5175 (FAX)
    amsamoaepa@yahoo.com

    Hours_of_Service: 7:30 a.m. to 4:00 p.m., -11 hours GMT
    (process 2 of 5)
    Metadata imported.

    Data sources used in this process:

    • C:\GIS\Databank\Infrastructure\UTM_NAD83\tut_villages_pt.shp.xml

    (process 3 of 5)
    Metadata imported.

    Data sources used in this process:

    • C:\GIS\Temp\WhileServerIsDown\tut_counties.shp.xml

    (process 4 of 5)
    Dataset copied.

    Data sources used in this process:

    • G:\Projects\Roads\Data\tut_roads03_east

    (process 5 of 5)
    Metadata imported.

    Data sources used in this process:

    • G:\Databank\Infrastructure\UTM_NAD83\tut_roads03_east.shp.xml

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

    .

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

  1. How well have the observations been checked?

    Area and perimeter numbers were generated using XTOOLS 3.0 in ArcGIS 8.3.

  2. How accurate are the geographic locations?

    Total Station used for survey is accurate to +/- 1 second in horizontal angle and +/- 0.02 feet in distance. Survey mis close for traverse was 0.17 feet (unadjusted) giving an absolute horizontal positional error of 0.2 feet.

  3. How accurate are the heights or depths?

    Optical Level Accuracy is +/- 0.01 feet. Survey mis close for traverse was 0.04 feet (unadjusted) giving an absolute vertical positional error of 0.05 feet.

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

    The required information submitted is complete as required. However, it should be noted that the position of the ridge line beyond the points closest to the Concrete Plinths is approximate only as it was not practical (or necessary) to climb the ridge to accurately determine its position.

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

    The Malaemi Special Management Area is contained within the areas to the east and north of azimuth 324deg 03min 36sec from Concrete Plinth MV1 290361.63N, 238556.11E, 140.12L ASD 1962. And the west and north of azimuth 215deg 08min 51sec from Concrete Plinth MV6 291277.71N, 240730.46E, 126.60L. And to the extents of the watershed contained by Tuasivi Ridge, Taumata Mountain, and Tau Mountain.

How can someone get a copy of the data set?

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

Access_Constraints:
Data set is not for use in litigation. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, ASEPA and ASCMP cannot assume liability for any damages, or misrepresentations, caused by any inaccuracies in the data, or as a result of the data to be used on a particular system. ASEPA and ASCMP make no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Use_Constraints: none.

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

    American Samoa Department of Commerce
    GIS Section
    Department of Commerce, Executive Office Building
    Pago Pago, AS 96799
    USA

    011-684-633-5155 (voice)
    011-684-633-4195 (FAX)
    info@doc.asg.as

    Hours_of_Service: Monday - Friday, 7:30 a.m. to 4:00 p.m., -11 hours GMT
  2. What's the catalog number I need to order this data set?

    Delineation of Malaeimi Special Management Area on the island of Tutuila in American Samoa.

  3. What legal disclaimers am I supposed to read?

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    Download from internet @ <http://dusk.geo.orst.edu/djl/samoa/>

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

    Requires software that can read/display the ESRI shapefile format.

Who wrote the metadata?

Dates:
Last modified: 23-May-2003
Last Reviewed: 05-Nov-2002
Metadata author:
American Samoa Department of Commerce
GIS Section
Executive Office Building
Pago Pago, AS 96799
USA

684-633-5155 (voice)
684-633-4195 (FAX)
info@doc.asg.as

Hours_of_Service: Monday - Friday, 7:30 a.m. to 4:00 p.m., -11 hours GMT
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.14 on Thu Dec 02 12:35:56 2004