bathy30

Identification Information

Citation Information

Originator

Arnold Banner

Publication Date

20040224

Title

bathy30

Geospatial Data Presentation Form

raster digital data

Series Name

Maine GIS

Issue Identification

SDE server; Internet Data Catalog

Publication Place

Augusta ME

Publisher

Maine Office of Geographic Information Systems (MEGIS)

Other Citation Details

1:24000 Published 20020709 BATHY30 is U.S. Fish & Wildlife GOMGRID6 bathymetry of the Gulf of Maine from soundings, NOAA nautical charts, existing coverages, aerial photo-interpreted sources. It is a raster data set of bathymetry and intertidal cover types; for more information about the USFW Gulf of Maine Watershed Habitat Analysis and supplemental information about BATHY30 see: http://r5gomp.fws.gov/gom/habitatstudy/metadata/gombathydoc.htm. (USFWGOMP) ESRI Grid format(MEGIS) ArcInfo version 8.3, Solaris 7, Grid and GeoTIFF (regionwide) BATHY30 is available as a single raster in GRID format from the Maine GIS SDE server and as a color embedded GeoTIFF from the Maine GIS Data Catalog at http://megis.maine.gov/catalog/catalog.asp. Two .jpeg files are available, for a quick color view of the coded classification. The raster in GRID format, a colormap, an ArcView .avl legend file, and an ArcGIS .lyr layer file are also available on CD from USFW.

Online Linkage

http://megis.maine.gov/catalog/

[smcilnkh]

true

Citation Information

Originator	Gulf of Maine Program
Title	(GOMHMP)Gulf of Maine Habitat Mapping Project
Geospatial Data Presentation Form	document
Publication Place	Falmouth ME
Publisher	U.S. Fish and Wildlife Service, Northeast Region

[smcisrcs]

24000

Beginning Date

1986

Ending Date

2002

[smcisrcc]

source dates

Abstract

BATHY30 is a raster dataset of bathymetry and intertidal cover types for the Gulf of Maine developed by the U.S. Fish & Wildlife Service; Gulf of Maine Program. Sounding data was used in deeper areas to generate a relatively coarse resolution bathymetry grid. Finer spatial resolution around inshore features were achieved by use of tidal exposure classifications described from aerial photography (e.g., "regularly flooded, irregularly exposed, irregularly flooded") in the USFWS National Wetland Inventory datasets, channels and tidal flats mapped from photography in Maine's Coastal Marine Geologic Environments (CMGE), and Massachusetts orthophoto wetlands maps. These classes were not translated into absolute elevations, but instead were coded as to position within the intertidal zone, and the general cover type (e.g., high marsh, lower intertidal flats, etc.), which may convey useful ecological information. Where near shore subtidal bathymetry were inadequate, the grid was 'patched' using grids developed from scanned NOAA charts. For more information about the USFW Gulf of Maine Program and a CD of data from the Gulf of Maine Watershed Habitat Analysis plus supplemental information about BATHY30 see: http://gulfofmaine.fws.gov/ and http://r5gomp.fws.gov/gom/habitatstudy/metadata/gombathydoc.htm.

Purpose

This information is meant to be used for habitat protection in the Gulf of Maine watershed as identified by the U.S. Fish & Wildlife Service.

Supplemental Information

BATHY30 is available as a single raster in GRID format from the Maine GIS SDE server. An ArcGIS .lyr file to assist users in applying the correct legend information is available in the Maine GIS final data directory crypt83/layers/bathy30.lyr. The GRID, a color embedded GeoTIFF, two .jpgs views, and an ArcGIS .lyr file bathy30.lyr, are available from the Maine GIS Data Catalog at http://megis.maine.gov/catalog/ Two .jpeg files are available, for a quick color view of the coded classification. These data are also available from USFWS on CD, see point of contact below.

Time Period of Content

Currentness Reference	publication date

Status

Progress	Complete
Maintenance and Update Frequency	none planned

Bounding Coordinates

West Bounding Coordinate	-71.3
East Bounding Coordinate	-66.83171
North Bounding Coordinate	47.4396
South Bounding Coordinate	42.9

Keywords

Theme	imageryBaseMapsEarthCover, elevation, oceans (ISO Keyword Thesaurus)
Theme	water depth, bathymetry, estuarine (Maine GIS Thesaurus-Theme)
Place	Maine, New Hampshire, Gulf of Maine, Massachusetts, United States (Maine GIS Thesaurus-Place)
Stratum	oceans, biosphere, hydrosphere, radiance or imagery (GCMD Parameter Keyword)

Access Constraints

none

Use Constraints

Users must assume responsibility in determining the usability of this data for their purposes. Digital maps retain the accuracy of their source materials. The best use of data mapped at scales of 1:500,000 and 1:250,000 is in statewide planning and studies; at 1:100,000 in regional planning and studies; at 1:62,500 and 1:24,000 in detailed studies and local planning; and at 1:12,000 and 1:5,000 or larger scales in parcel level studies and detailed local planning. In the use of Maine GIS data, please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the correct copy of both data and metadata from the Maine GIS Data Catalog. Updates, corrections, and feedback, incorporated in the Maine GIS database are made in accordance with "Data Standards for Maine Geographic Information Systems", 2002, and coordinated by MEGIS.

Contact Organization

(USFWGOMP) US Fish and Wildlife Service, Gulf of Maine Program

Contact Position

Wildlife Biologist / GIS Specialist

Address Type

mailing and physical address

Address

4R Fundy Road

City

Falmouth

State or Province

Postal Code

04105-1764

Country

USA

Contact Voice Telephone

(207) 781-8364

Contact Facsimile Telephone

(207) 781-8369

Contact Electronic Mail Address

fw5es_gomp.gis@fws.gov

[smcoemhy]

true

Hours of Service

Monday through Friday 0800 - 1630 EST

Native Data Set Environment

(USFWGOMP) Maine Office of Information Technology (OIT) Oracle 9i, Maine Office of Geographic Information Systems (MEGIS), Maine GIS SDE, SDEUSER, SDE.DEFAULT, Maine GIS Internet Data Catalog http://megis.maine.gov/catalog/

Attribute Accuracy Report

The mapped areas were compared to geo-referenced digital NOAA nautical charts as a general check for processing and data errors.

Completeness Report

The coverage may erroneously characterize depths because of limitations of the source data and processing errors from averaging point values.

Horizontal Positional Accuracy Report

Data set accuracy generally ranges from that of the 1:24,000 base data (inshore) to the 15 second raster data (used offshore).

Horizontal Positional Accuracy Value

Horizontal Positional Accuracy Explanation

Compilation base data meets National Map Accuracy Standards for 1:24,000 scale.

Vertical Positional Accuracy Report

The distribution of sounding data available for deeper areas is sufficient to generate a relatively coarse resolution bathymetry grid. Finer spatial resolution around inshore features is needed, but soundings in intertidal areas are not abundant. As an alternative the bathymetric depth values is supplemented in intertidal areas with tidal exposure classifications.These classes were not translated into absolute elevations, but instead coded as to position within the intertidal zone, and the general cover type, which may convey useful ecological information.

Citation Information

Originator	U.S. Fish and Wildlife Service (USFW) National Wetlands Inventory (NWI) Maine Office of Geographic Information Systems (MEGIS) (ed.)
Publication Date	1998
Publication Time	Unknown
Title	nwi_old
Geospatial Data Presentation Form	vector digital data
Series Name	Maine GIS
Issue Identification	SDE server; Internet Data Catalog
Publication Place	MEGIS Library and Data Catalog
Publisher	Maine Office of Geographic Information Systems
Other Citation Details	1:24000 For more information on the Cowardin System see L.M.Cowardin, et al, 1979 "Classification of Wetland and Deepwater Habitats of the United States". U.S. Department of the Interior, Fish and Wildlife Service FWS/OBS-79/31. http://www.nwi.fws.gov/Pubs_Reports/Class_Manual/class_titlepg.htm
Online Linkage	http://megis.maine.gov/catalog/
[smcilnkh]	false
[smcisrcs]	24000
[smcisrcm]	online
Beginning Date	197102
Beginning Time	Unknown
Ending Date	199212
Ending Time	Unknown
[smcisrcc]	source dates

Source Scale Denominator

24000

Type of Source Media

online

Beginning Date

197102

Beginning Time

Unknown

Ending Date

199212

Ending Time

Unknown

Source Currentness Reference

source dates

Source Citation Abbreviation

nwi

Source Contribution

Intertidal cover type and tidal position modifier used for Maine, New Hampshire, and Massachusetts.

Citation Information

Originator	Maine Geological Survey (MGS)
Publication Date	2000
Publication Time	Unknown
Title	cmges
Geospatial Data Presentation Form	vector digital data
Series Name	Maine GIS
Issue Identification	SDE server
Publication Place	Augusta ME
Publisher	Maine Office of Geographic Information Systems (MEGIS)
Other Citation Details	1:24000
[smcilnkh]	false
[smcisrcs]	24000
[smcisrcm]	online
Beginning Date	19740101
Beginning Time	Unknown
Ending Date	19761231
Ending Time	Unknown
[smcisrcc]	source dates

Source Scale Denominator

24000

Type of Source Media

online

Beginning Date

19740101

Beginning Time

Unknown

Ending Date

19761231

Ending Time

Unknown

Source Currentness Reference

source dates

Source Citation Abbreviation

cmges

Source Contribution

Used for Maine as an alternative data set for intertidal flats and improved tidal channel characterization, to supplement NWI.

Citation Information

Originator	U.S. Geological Survey (USGS)
Publication Date	multiple dates
Publication Time	Unknown
Title	(24k) USGS 1:24,000 scale quadrangles
Geospatial Data Presentation Form	map
Series Name	National Mapping Program Standard Series Topographic Maps
Issue Identification	USGS 7.5 Minute Map Series
Publication Place	Reston VA
Publisher	U.S. Geological Survey
Other Citation Details	24000 Publication date is unique to each quadrangle in the map series. Standard 7.5x7.5 minute quadrangles cover geographic areas of 49 to 71 square miles. 1 inch at map scale represents 2000 feet.
Online Linkage	http://mapping.usgs.gov/mac/maplists/howtoselectmaps.html
[smcilnkh]	false
[smcisrcs]	24000
[smcisrcm]	stable-base material (mylar)
Beginning Date	19480101
Beginning Time	Unknown
Ending Date	Present
Ending Time	Unknown
[smcisrcc]	publication date

Source Scale Denominator

24000

Type of Source Media

stable-base material (mylar)

Beginning Date

19480101

Beginning Time

Unknown

Ending Date

Present

Ending Time

Unknown

Source Currentness Reference

publication date

Source Citation Abbreviation

24k

Source Contribution

USGS hydrologic feature polygons were coded with national wetlands attributes (based on NWI paper maps), to fill in areas without digital NWI or orthophoto wetlands (part of Massachusetts).

Citation Information

Originator	U.S. Department of Commerce (USDOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Special Projects (SP)
Publication Date	1997
Title	(GEODAS) National Ocean Service-Hydrographic Survey Data
Geospatial Data Presentation Form	map
Publication Place	Boulder CO
Publisher	NOAA, National Environmental Satellite, Data and Information Service (NESDIS), National Geophysical Data Center (NGDC)
Other Citation Details	hydrographic soundings
Online Linkage	http://www.ngdc.noa.gov:80/mgg/geodas/hydass.html
[smcilnkh]	false
[smcisrcm]	CD-ROM
Beginning Date	1839
Beginning Time	Unknown
Ending Date	1991
Ending Time	Unknown
[smcisrcc]	survey date

Type of Source Media

CD-ROM

Beginning Date

1839

Beginning Time

Unknown

Ending Date

1991

Ending Time

Unknown

Source Currentness Reference

survey date

Source Citation Abbreviation

geodas

Source Contribution

Used for Maine, New Hampshire, Massachusetts.

Citation Information

Originator	U.S. Department of Commerce (USDOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Special Projects (SP)
Publication Date	19980606
Title	(NOAABATHY30) Estuarine Bathymetric Digital Elevation Models(30 Meter and 3 arc second resolution)
Geospatial Data Presentation Form	raster digital data
Publication Place	Silver Spring MD
Publisher	NOAA's Ocean Service Special Project
Online Linkage	http://mapfinder.nos.noaa.gov and http://spo.nos.noaa.gov/bathy/finddata.htm
[smcilnkh]	false
[smcisrcm]	CD-ROM
Beginning Date	1839
Beginning Time	Unknown
Ending Date	1989
Ending Time	Unknown
[smcisrcc]	ground condition

Type of Source Media

CD-ROM

Beginning Date

1839

Beginning Time

Unknown

Ending Date

1989

Ending Time

Unknown

Source Currentness Reference

ground condition

Source Citation Abbreviation

noaabathy30

Source Contribution

Used for identification of subtidal and deeper areas within the Gulf of Maine.

Citation Information

Originator	U.S. Geological Survey (USGS)
Publication Date	Unpublished Material
Title	(USGSBATHY)Digital Bathymetry for the Gulf of Maine
Other Citation Details	USGS project for construction of digital bathymetry for the Gulf of Maine
Online Linkage	http://woodshole.er.usgs.gov/project-pages/oracle/gomaine/bathy/data.htm
[smcilnkh]	false
Time of Day	Unknown

Time of Day

Unknown

Source Citation Abbreviation

usgsbathy

Source Contribution

USGS depth contours were digitized for Cobscook Bay, Maine.

Citation Information

Originator	National Oceanic and Atmospheric Administration (NOAA)
Publication Date	multiple dates
Title	(NOAANAUT)Nautical Charts
Geospatial Data Presentation Form	map
Publication Place	Silver Springs MD
Publisher	National Ocean Service
[smcilnkh]	false
Time of Day	Unknown

Time of Day

Unknown

Source Citation Abbreviation

noaanaut

Source Contribution

NOAA nautical charts were used as background for checking sources. Also, some line and point features were digitized for use in New Hampshire and Maine. Rasterized versions of charts were used to 'cut and paste' some channel and inlet depth zones where these were an improvement over the interpolation from limited point or line data. Arcs digitized from NOAA metric charts were provided by Richard Kelley/MEGIS, for use in Maine.

Process Description

Data from all sources was converted to depth in feet, reference mean low water, and projected as coverages to UTM. TINs (triangulated irregular network; ESRI, ArcInfo) were created from the following data sets. Subtidal bathymetry components: Mean low water (0 depth line): The intertidal (0) line was the outer boundary of the intertidal grid, based on aerial photo-interpreted this was supplemented with arcs digitized from NOAA charts and USGS quad sheets. Mean high water (elevation varies along coast): Used the USGS coast line coverage as mhw; made the depth value +19' at Calais, 16' at West Quoddy Head, 15' at Moose Cove, etc, based on tide table: 'Rise for substations of Portland'; set at + 6 to + 7 for Massachusetts and New Hampshire. Soundings: NOAA points, from CDROM, < 30 meters only; used all Jackson Laboratory and Corps of Engineers, New Hampshire soundings; USGS and NOAA arcs. TINs were created and used to produce grids of near shore bathymetry from the above sources, at 15 m and at 30 m resolution. The USGS 15 - second grid was used to fill in deeper areas; the resultant grid was overlain with the NOAA embayment data where this more closely corresponded with NOAA charts. Finally, the intertidal grids were superimposed. Subtidal bathymetry, of certain embayments and channels, mostly on the Maine coast, still was a poor match with the published NOAA charts. This was because the TINS were based on limited digital data for these areas, while the charts were based on far more complete soundings. Using scanned versions of the charts, the author converted the images to grids, then used the color rendition as the link to the depth range designated on the chart, and clipped out replacement 'patches' for each of the embayments to be corrected. The NOAA chart soundings were inspected, and a intermediate depth value was assigned each patch. Patches and base grid were combined by retaining the deeper value from either source. Two final grids were produced: one retained all integer depth values, and a "descriptive" attribute to group intertidal features and depths into a few classes (see below). The other grid has only the classes, and therefore has a smaller file size.

Process Date

2002/06/10

Contact Organization

(USFWGOMP) US Fish and Wildlife Service, Gulf of Maine Program

Contact Position

Wildlife Biologist / GIS Specialist

Address Type

mailing and physical address

Address

4R Fundy Road

City

Falmouth

State or Province

Postal Code

04105-1764

Country

USA

Contact Voice Telephone

(207) 781-8364

Contact Facsimile Telephone

(207) 781-8369

Contact Electronic Mail Address

fw5es_gomp.gis@fws.gov

[smcoemhy]

true

Hours of Service

Monday through Friday 0800 - 1630 EST

Indirect Spatial Reference

image Gulf of Maine Watershed

Direct Spatial Reference Method

Raster

Raster Object Type

Grid Cell

Row Count

21381

Column Count

13972

[smcaptur]

false

Grid Coordinate System Name

Universal Transverse Mercator 1983

UTM Zone Number

Scale Factor at Central Meridian

0.9996

Longitude of Central Meridian

-69

Latitude of Projection Origin

False Easting

500000

False Northing

Planar Coordinate Encoding Method

Coordinate Pair

Abscissa Resolution

Ordinate Resolution

Horizontal Datum Name

North American Datum of 1983

Ellipsoid Name

Geodetic Reference System 80

Semi-major Axis

6378137

Denominator of Flattening Ratio

298.257

Entity Type Label

BATHY30

Entity Type Definition

value attribute table

Entity Type Definition Source

Environmental Systems Research Institute, Inc. (ESRI)

Attribute Label

COUNT

Attribute Definition

number of pixels with same value

Attribute Definition Source

software generated

[smcaptur]

false

Attribute Label

VALUE

Attribute Definition

descriptive attribute used to group intertidal features and depths into a few classes.

Enumerated Domain Value

Enumerated Domain Value Definition

upper intertidal; high marsh