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.
Schaefer, J.R., Wallace, K.L., and Kassel, C.M., 2008, Preliminary bathymetric map of Mother Goose Lake, Alaska Peninsula: Raw Data File RDF 2008-3, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.Online Links:
This is a Vector data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.01
Ordinates (y-coordinates) are specified to the nearest 0.01
Planar coordinates are specified in meters
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 1/298.25722210088.
| Range of values | |
|---|---|
| Minimum: | 5 |
| Maximum: | 50 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 0.4 |
| Maximum: | 263.639 |
| Units: | feet |
| Range of values | |
|---|---|
| Minimum: | 0.12192 |
| Maximum: | 80.3571 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | -157.363 |
| Maximum: | -157.258 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 57.1805 |
| Maximum: | 57.2252 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | -157.361 |
| Maximum: | -157.256 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 57.1812 |
| Maximum: | 57.226 |
| Units: | degrees |
(907) 451-5029 (voice)
(907) 451-5050 (FAX)
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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.
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.
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.
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.
not applicable
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.
907-451-5020 (voice)
907-451-5050 (FAX)
dggspubs@alaska.gov
RDF 2008-3
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| Data format: | ArcGIS Shapefile (version ESRI ArcGIS 9.x) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/16301> |
Digital files on CD-ROM are available for $10.00 (contact information below). No fees charged for downloaded files.
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.
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907-451-5005 (voice)
janet.schaefer@alaska.gov