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Report for H12938 Locality: Unalaska Island Sublocality: Nateekin Bay to Broad Bay State(s) or Region(s): Alaska Start Date: 2016-08-09 End Date: 2016-08-22 These data are not to be used for navigation. For navigation please refer to NOS Nautical Charts. Download times vary depending on file size and data transfer rates. Download All Products for H12938
Visit the full NCEI Bathymetry Viewer.

Survey Products

Descriptive Report and Metadata Documents

NOAA/NOS Descriptive Report & Survey Metadata
Products listed in the project descriptive report (DR) may not reflect final products available through NCEI.
H12938_DR.pdf	15.44MB	The document may be read using a free Adobe Reader.
H12938_DR.xml	59.0KB	Descriptive Report in XML format. May be opened using a web browser or text viewer.
NOAA/NOS ISO Metadata Record
H12938 View / Download H12938.xml		Usually presented as an XML document, which captures the basic characteristics of HSMDB metadata verified from H10000 (1982) to the present as well as F00200 (1965) to the present.

Bathymetry

Survey products may use different units, datums or projections than the associated survey. Please consult product-specific metadata for additional details.
Bathymetric Attributed Grid (BAG) Data
The BAG format is a gridded, multi-dimensional bathymetric data file (see Open Navigation Surface). Readable with various applications such as the free CARIS Easy View, ESRI ArcGIS or open source GDAL. The BAGXYZ files are ascii representations of the BAG data in XYZ format, but do not include uncertainty.
H12938_MB_8m_MLLW_4of4.bag	1.11MB
H12938_MB_1m_MLLW_1of4.bag	44.40MB
H12938_MB_2m_MLLW_2of4.bag	9.87MB
H12938_MB_4m_MLLW_3of4.bag	5.18MB
Ellipsoid Referenced BAG Files
Ellipsoid referenced Bag files have a vertical datum that may differ materially from the charted datum. Please refer to the file level metadata to ensure proper display.
H12938_MB_1m_Ellipsoid_1of4.bag	44.58MB
H12938_MB_4m_Ellipsoid_3of4.bag	5.22MB
H12938_MB_8m_Ellipsoid_4of4.bag	1.11MB
H12938_MB_2m_Ellipsoid_2of4.bag	9.93MB
NOAA/NOS Sounding Data
Download data from the Point Store database via NEXT (NCEI Extract System). Point soundings are from the survey Smooth Sheet or of similar density. Depths in meters. Vertical datum is (converted to) Mean Lower Low Water if possible. Please check the associated metadata to confirm the correct datums. The data file format is : SurveyID, Long, Lat, Depth.
H12938		XYZ format.

Images

GeoImagePDF
H12938_GeoImage.pdf	30.75MB	NOAA/NOS Layered GeoSpatial Image PDF File. Created by NOS to include chart and survey layers in a georeferenced pdf format.

Bottom Samples and Tide Documents

Bottom Sample Data
NOAA/NOS bottom sample listing in IMLGS (pre-1989)
Link to H12938 in IMLGS (pre-1989 samples)		Search NOAA/NOS seabed samples submitted to IMLGS through NMNH (pre-1989). Modern survey bottom samples are not currently viewable on a map service.
NOAA/NOS bottom sample document in PDF or ASC format
H12938_BottomSamples.ascii	1.0KB	NOAA/NOS bottom sample document in PDF or ASC format.
NOAA/NOS Tide Note in PDF Format
H12938_tn.pdf	81.4KB	This document may be read using a free Adobe Reader.
NOAA/NOS Tide Zone in PDF format
H12938_tz.pdf	103.0KB	This document may be read using a free Adobe Reader.

Project Documents

Project Sketch in JPEG format
H12938_ProjectSketch.jpg	136.4KB	Project sketch image with highlighted survey area.
Data Acquisition and Processing Report in PDF format
OPR-Q328-FA-16_DAPR.pdf	28.04MB	This document may be read using a free Adobe Reader.

Survey Metadata

Survey Summary

Locality Sublocality State or Region Unalaska Island Nateekin Bay to Broad Bay Alaska

Start Date End Date Approval Date 2016-08-09 2016-08-22 2016-11-19

Project Number Project Name Purpose OPR-Q328-FA-16

Source of Original Data and License Information

License Information These data were produced by NOAA and are in the public domain within the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0). View the license deed. View the legal code.

Reference System Information

Vertical Datum Horizontal Datum Projection Scale Mean Lower Low Water World Geodetic System (WGS) 1984 Projected UTM 3 5000

Affected Products

ENCs RNCs US5AK6EM 16530 16528

Survey Equipment

Vessel(s) Chief(s) of Party 2807 (FA) 2806 (FA) 2805 (FA) CDR Mark Van Waes, NOAA

Manufacturer Model Instrument Type RESON 7125 MBES

Source Data at NCEI

Data in Archive Size (in GB) Date Archived Data Types Raw and Processed 113.794 2020-01-08 09:39:51.0 BACKSCATTER, BATHYMETRY