Identification_Information: Citation: Citation_Information: Originator: Schaefer, J.R. Originator: Wallace, K.L. Originator: Kassel, C.M. Publication_Date: 2008 Title: Preliminary bathymetric map of Mother Goose Lake, Alaska Peninsula Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2008-3 Publication_Information: Publication_Place: Fairbanks, Alaska - USA Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Online_Linkage: http://dx.doi.org/10.14509/16301 Description: Abstract: In preparation for bottom sediment coring at Mother Goose Lake, bathymetric data was collected using a Lowrance Sonar "fishfinder" (model LcX-17M) in August 2006 and August 2007. A 5-meter bathymetric contour map of the lake bottom was constructed using the GPS-sonar data in conjunction with field observations. The contour data and GPS location and depth data are provided in ESRI shapefile format for use in Geographic Information System (GIS) software. Purpose: The purpose of this bathymetric data release is to provide scientific collaborators who are working on the Chiginagak volcano acid flood event, such as geologists and fisheries biologists, with depth information of Mother Goose Lake. Supplemental_Information: The layers listed below are present as ArcGIS shape files. 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: >MGL_islands_polyline Outline of the islands in Mother Goose Lake. >MGL_shore_polyline Outline of the Mother Goose Lake shoreline. >MGL_contour_5m_polyline 5-meter bathymetric contour map of Mother Goose Lake. >MGL_gps_depth_point Lat-Long-Depth point file of data collected at Mother Goose Lake used to derive the bathymetric map. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20060824 Ending_Date: 20060825 Currentness_Reference: ground condition Status: Progress: In work Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -157.403722 East_Bounding_Coordinate: -157.233482 North_Bounding_Coordinate: 57.231361 South_Bounding_Coordinate: 57.178854 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Bathymetry Theme_Keyword: Lacustrine Place: Place_Keyword_Thesaurus: Geographic Names Information System Place_Keyword: Alaska Peninsula Place_Keyword: Chiginagak Place_Keyword: Mother Goose Lake Place_Keyword: Ugashik Quadrangle 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Contact_Position: GIS Data Manager/Cartographer Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Contact_Voice_Telephone: (907) 451-5029 Contact_Voice_Telephone: (907) 451-5020 Contact_Facsimile_Telephone: (907) 451-5050 Contact_Electronic_Mail_Address: dggspubs@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 since our web site and e-mail address will remain current even if our phone number and mailing address change. Browse_Graphic: Browse_Graphic_File_Name: MGL_bathymetry.jpg Browse_Graphic_File_Description: Bathymetric contour map of Mother Goose Lake Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: Microsoft Windows XP SP2. The original data set was created in MapInfo Professional 8.0 then converted to ESRI shapefiles using the MapInfo Universal Translator. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Attributes in this dataset consist of positional information reported in latitude and longitude (decimal degrees in both NAD27 and NAD83 datums), and depth information reported in feet and meters. Original latitude, longitude, and depth attributes were recorded digitally by the Lowrance GPS-sonar unit. Original location information was recorded in a Mercator projection with the WGS84 datum. Depth in feet was converted to depth in meters by applying a conversion factor of 0.3048. The resulting data is in file MGL_gps_depth_point. Attributes in the bathymetric contour data file MGL_contour_5m_polyline consist of labels of depth in meters and were added manually as the polylines were constructed in a GIS from the MGL_gps_depth_point file. Logical_Consistency_Report: not applicable Completeness_Report: This dataset includes preliminary bathymetric data collected over a 2-day period in August of 2006 and a 5-day period in August 2007. The footprint of the GPS-sonar track data used to derive the contour map is small, thus the contour map represents a generalized illustration of the true bathymetry of Mother Goose Lake. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: GPS-sonar data was collected with a Lowrance "fishfinder" (model LcX-17M) with a positional accuracy of approximately 15 meters. However, after mapping the sonar data in a GIS in conjunction with a vector shoreline constructed from Landsat imagery, the position of data points appears to be up to 150m off (for example, the track data in the file MGL_gps_depth_point shows points going up onto shore. Lineage: Process_Step: Process_Description: Lowrance (model LcX-17M) GPS-Sonar data was collected at Mother Goose Lake on August 24-25, 2006 and August 15-19, 2007 . Lowrance GPS data is collected and stored in a Mercator projection with a datum of WGS84. Sonar log file data was converted to a comma-delimited text file using a free utility from Lowrance called Sonar Viewer (http://www.lowrance.com/Software/PCSoftware/sonar_viewer.asp). This text file was imported into Microsoft Excel, and the following conversion was applied to convert the Mercator WGS84 projection to Geographic decimal degree coordinates in a NAD83 datum: Excel formula to convert Mercator WGS84 location (X,Y) to Geographic Coordinates NAD83 to (longitude, latitude) decimal degrees Latitude =RadToDeg*((2*ATAN(EXP(Y/SemiMinor))-PI()/2)) Longitude =(X*RadtoDeg)/SemiMinor Where RadtoDeg = 57.2957795132 SemiMinor = 6356752.3142 X = Lowrance position X in Mercator WGS84 Y = Lowrance position Y in Mercator WGS84 Depth information stored in feet was converted to meters by applying a conversion factor of 0.3048. This data was then imported into MapInfo Professional 8.0 to display the depth data geospatially. The projection was converted to UTM zone 4, NAD83. Decimal degree latitude and longitude information in both NAD83 and NAD27 datums were generated by projecting and updating columns in MapInfo. Using both field observations of lake depth, and the geospatially accurate sonar data, a contour of lake depth was created by digitizing around depth points in MapInfo. The file was then exported to ESRI shapefile format using MapInfo Professional 8.0 Universal Translator. Shoreline and Islands (MGL_shore_polyline and MGL_islands_polyline): The polylines defining both the Mother Goose Lake shoreline and island shorelines were created in MapInfo Professional 8.0 using a May 8, 2005, 30-meter-pixel-width, Landsat 7 image as the base. The Landsat image was provided in a UTM zone 4 projection with a datum of WGS84. After construction, the polyline files were reprojected in MapInfo to UTM zone 4, NAD27, before exporting to shapefile format. The Landsat 7 image was set at a zoom scale of 1:10,000 during construction of the shoreline and island polyline files. Process_Date: 200608 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 4 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -159 Latitude_of_Projection_Origin: 0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.01 Ordinate_Resolution: 0.01 Planar_Distance_Units: meters Planar_Coordinate_Layer_Name: MGL_contour_5m_polyline Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 4 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -159 Latitude_of_Projection_Origin: 0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.01 Ordinate_Resolution: 0.01 Planar_Distance_Units: meters Planar_Coordinate_Layer_Name: MGL_islands_polyline Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 4 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -159 Latitude_of_Projection_Origin: 0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.01 Ordinate_Resolution: 0.01 Planar_Distance_Units: meters Planar_Coordinate_Layer_Name: MGL_gps_depth_point Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 4 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -159 Latitude_of_Projection_Origin: 0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.01 Ordinate_Resolution: 0.01 Planar_Distance_Units: meters Planar_Coordinate_Layer_Name: MGL_shore_polyline Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.25722210088 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: MGL_islands_polyline Entity_Type_Label: MGL_islands_polyline.shp Entity_Type_Definition: 1 object. Polyline defining the outline of the islands in Mother Goose Lake. This feature was not assigned any user defined attribute. Entity_Type_Definition_Source: This report Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: MGL_contour_5m_polyline Entity_Type_Label: MGL_contour_5m_polyline.shp Entity_Type_Definition: Polyline file representing 10-meter bathymetric contours of Mother Goose Lake. Entity_Type_Definition_Source: This report Attribute: Attribute_Label: contour_m Attribute_Definition: line joining points of equal depth in 5-meter intervals Attribute_Definition_Source: This report Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 5 Range_Domain_Maximum: 50 Attribute_Units_of_Measure: meters Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 5 Attribute_Value_Accuracy_Explanation: See vertical accuracy report Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: MGL_gps_depth_point Entity_Type_Label: MGL_gps_depth_point.shp Entity_Type_Definition: 25823 points of decimal degree latitude and longitude listed in both NAD83 datum and NAD27 datum. Depth listed in both feet and meters. Entity_Type_Definition_Source: This report Attribute: Attribute_Label: Depth_ft Attribute_Definition: depth, in feet, below lake surface Attribute_Definition_Source: This report Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.4 Range_Domain_Maximum: 263.639 Attribute_Units_of_Measure: feet Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 15 Attribute_Value_Accuracy_Explanation: Large swells in the lake during data collection may result in value accuracies of up to +/- 15 feet. Attribute: Attribute_Label: Depth_m Attribute_Definition: Depth, in meters, below lake surface Attribute_Definition_Source: This report Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.12192 Range_Domain_Maximum: 80.3571 Attribute_Units_of_Measure: meters Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 5 Attribute_Value_Accuracy_Explanation: Large swells in the lake during data collection may result in value accuracies of up to +/- 5 meters. Attribute: Attribute_Label: LongNAD83 Attribute_Definition: Longitude of depth measurement in decimal degrees, NAD83 datum Attribute_Definition_Source: This report Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -157.363 Range_Domain_Maximum: -157.258 Attribute_Units_of_Measure: degrees Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 150 Attribute_Value_Accuracy_Explanation: Attribute value accuracy reported in meters. Attribute: Attribute_Label: LatNAD83 Attribute_Definition: Latitude of depth measurement reported in decimal degrees, NAD83 datum Attribute_Definition_Source: This report Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 57.1805 Range_Domain_Maximum: 57.2252 Attribute_Units_of_Measure: degrees Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 150 Attribute_Value_Accuracy_Explanation: Attribute value accuracy reported in meters. Attribute: Attribute_Label: LongNAD27 Attribute_Definition: Longitude of depth measurement in decimal degrees, NAD27 datum. Attribute_Definition_Source: This report Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -157.361 Range_Domain_Maximum: -157.256 Attribute_Units_of_Measure: degrees Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 150 Attribute_Value_Accuracy_Explanation: Attribute Value Accuracy reported in meters. Attribute: Attribute_Label: LatNAD27 Attribute_Definition: Latitude of depth measurement in decimal degrees using NAD27 datum. Attribute_Definition_Source: This report Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 57.1812 Range_Domain_Maximum: 57.226 Attribute_Units_of_Measure: degrees Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 150 Attribute_Value_Accuracy_Explanation: Attribute Value Accuracy reported in meters. Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: MGL_shore_polyline Entity_Type_Label: MGL_shore_polyline Entity_Type_Definition: 1 object. Polyline defining the shore of Mother Goose Lake. This feature was not assigned any user defined attribute. Entity_Type_Definition_Source: This report Overview_Description: Entity_and_Attribute_Overview: Below is a brief description of the four ESRI shapefiles found in this dataset: MGL_islands_polyline - Outline of the islands in Mother Goose Lake. MGL_shore_polyline - Outline of the Mother Goose Lake shoreline. MGL_contour_5m_polyline - 5-meter bathymetric contour map of Mother Goose Lake. MGL_gps_depth_point - Point file of GPS-sonar track data used to construct the bathymetric map. Positional data is reported in decimal degrees of latitude and longitude (NAD 27 datum). Depth data is provided in both feet and meters. Entity_and_Attribute_Detail_Citation: This report Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709 Contact_Voice_Telephone: 907-451-5020 Contact_TDD/TTY_Telephone: None available Contact_Facsimile_Telephone: 907-451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our Web site (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Resource_Description: RDF 2008-3 Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ArcGIS Shapefile Format_Version_Number: ESRI ArcGIS 9.x File_Decompression_Technique: No compression applied Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://dx.doi.org/10.14509/16301 Fees: Digital files on CD-ROM are available for $10.00 (contact information below). No fees charged for downloaded files. Ordering_Instructions: Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). The DGGS web site (http://www.dggs.alaska.gov/) has a list of electronic data available and an order form that can be printed. Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround: Digital downloads: less than 30 minutes for most files. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid. Technical_Prerequisites: Please check the MapInfo web site (http://www.mapinfo.com/) for the latest documentation on importing ESRI shape files. Metadata_Reference_Information: Metadata_Date: 20080506 Metadata_Review_Date: 20080506 Metadata_Future_Review_Date: 20090319 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Janet Schaefer Contact_Address: Address_Type: mailing and physical Address: 3354 College Rd City: Fairbanks State_or_Province: AK Postal_Code: 99709 Contact_Voice_Telephone: 907-451-5005 Contact_Electronic_Mail_Address: janet.schaefer@alaska.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998