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Low Tide 2008

FGDC XML
Identification Information
Citation Information
Originator J.W. Sewall Co., Maine Department of Marine Resources (MeDMR) Maine Office of Geographic Information Systems (MEGIS)(comp)
Publication Date 200903
Title Low Tide 2008
Edition 2008
Geospatial Data Presentation Form raster digital data
Series Name Maine Coastal Low Tide Ortho-rectified Digital Images (ODI)
Issue Identification 2008
Publication Place Augusta ME
Publisher Maine Office of Geographic Information Systems (MEGIS)
Other Citation Details This service consists of 24-bit color aerial photography taken at low tide. These Sewall digital images have a pixel resolution (or ground sample distance) of 0.5 meters, are precision geo-referenced and ortho-rectified and can be used with 1"=200' mapping applications. These photographs were aquired in August, 2008.
Online Linkage http://www.maine.gov/geolib/wms.htm
[smcilnkh]  true
Abstract The Low Tide service is an OGC-compliant web mapping service (WMS) which contains high resolution 24-bit color Ortho-rectified Digital Images (ODIs) collected and processed by J. W. Sewall Co. These digital images result from ortho-rectification and mosaicking of digital color aerial photographs. Digital file features include high quality ground-level georeferencing, derived from accurate positioning and geometric corrections, and provide a digital photographic map suitable for applications requiring a 1:2400 National Map Accuracy Standard (NMAS). This service is available as a seamless mosaic. The imagery covers a portion of the Maine coastline at low tide (low water). Imagery created from scanned analog photography which was processed to for ortho-rectified mosaicks.
Purpose This photography was aquired for eelgrass, oil spill response planning, and other intertidal and shallow subtidal mapping applications.
Time Period of Content
Calendar Date 20080821
Time of Day Unknown
Currentness Reference flight date
Status
Progress Complete
Maintenance and Update Frequency irregular
Bounding Coordinates
West Bounding Coordinate -68.814148
East Bounding Coordinate -67.994664
North Bounding Coordinate 44.628199
South Bounding Coordinate 43.973918
Keywords
Theme imageryBaseMapsEarthCover (ISO Keyword Thesaurus)
Theme aerial photograph, ortho-rectified digital image (Maine GIS Thesaurus-Theme)
Place Maine (Maine GIS Thesaurus-Place)
Stratum land surface (GCMD Parameter Keyword)
Access Constraints The seamless presentation is available to Maine GIS users through an OGC-compliant WMS service presented by the Maine Office of GIS and the Maine GeoLibrary Board.
Use Constraints There are no licensing limitations.
Contact Organization Maine Department of Marine Resources
Contact Person Seth Barker
Contact Position GIS Manager
Address Type mailing address
Address State House Station 38
City Augusta
State or Province ME
Postal Code 04333-0038
Country USA
Contact Voice Telephone (207) 633-9500
Hours of Service Monday through Friday 0800 - 1700 EST
Data Set Credit James W. Sewall Co., Sanborn Mapping Co., Maine Dept. of Marine Resources.
Native Data Set Environment Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.1.1850
[smbrowse]  false
Logical Consistency Report The Coastal Maine Low Water Ortho-rectified Digital Images (ODIs)presented in ORTHO_LW cover a portion of the Maine coast from Eastern Penobscot Bay to Schoodic Point. The aerial photography was flown in 2008. The orthoimages produced from the photography have a pixel resolution (or ground sample distance) of 0.5 meters.
Horizontal Positional Accuracy Report Digital file features provide a digital photographic map suitable for applications requiring a 1:2400 National Map Accuracy Standard (NMAS).
Process Description Data captured.
Process Date 20080821
Contact Organization J. W. Sewall Company
Contact Person Nicol Cyr
Contact Position Imaging Production Manager
Address Type mailing address
Address Two DeLorme Drive, P.O. Box 298
City Yarmouth
State or Province ME
Postal Code 04096
Contact Voice Telephone 207-827-4456 ext. 264
Contact Facsimile Telephone 207-827-3641
Contact Electronic Mail Address nicole.cyr@sewall.com
Process Description A proprietary software program from Space Imaging was used to re-calculate some pixel values in the images. Pixels in which 1 or 2 of the 3 bands had values of zero were re-calculated to one. If all 3 bands equaled zero than the zero values were left untouched.Before loading into the ArcSDE database, the pixels in the .tiff images were adjusted to each other so that the pixels overlapped, allowing mosaicking. To adjust the pixels, an ESRI program name world_file_adjuster was used.The sderaster command was used to load the images into the ArcSDE database to create the ORTHO_MCP mosaic. During the load, the sderaster -o option was used for values equaled to zero. This loaded the images with a mask for pixels with a value of zero (one, two, or three bands).
Process Date 200401
Contact Organization (MEGIS) Maine Office of Geographic Information Systems
Contact Person Mike Smith
Contact Position GIS Manager
Address Type mailing address
Address State House Station 174
City Augusta
State or Province ME
Postal Code 04333-0174
Country USA
Contact Voice Telephone (207) 624-7700
Contact Facsimile Telephone (207) 287-3842
Contact Electronic Mail Address michael.smith@maine.gov
Hours of Service Monday through Friday 0800 - 1700 EST
Process Description The individual tiles were converted to MrSID imagery using LizardTech software. The original tiles were then resampled to create overview images for WMS. The resulting data are served from a MapServer-based system over the Internet.
Contact Organization (MEGIS) Maine Office of Geographic Information Systems
Contact Person Mike Smith
Contact Position GIS Manager
Address Type mailing address
Address State House Station 174
City Augusta
State or Province ME
Postal Code 04333-0174
Country USA
Contact Voice Telephone (207) 624-7700
Contact Facsimile Telephone (207) 287-3842
Contact Electronic Mail Address michael.smith@maine.gov
Hours of Service Monday through Friday 0800 - 1700 EST
Direct Spatial Reference Method Raster
Raster Object Type Pixel
Vertical Count 1
Grid Coordinate System Name 
UTM Zone Number 19
Scale Factor at Central Meridian 0.9996
Longitude of Central Meridian -69
Latitude of Projection Origin 0
False Easting 500000
False Northing 0
Planar Coordinate Encoding Method 
Planar Distance Units meters
Horizontal Datum Name North American Datum of 1983
Ellipsoid Name Geodetic Reference System 80
Semi-major Axis 6378137
Denominator of Flattening Ratio 298.257
Altitude Resolution 1.000000
Altitude Encoding Method 
Contact Organization Maine Office of Geographic Information Systems
Contact Position GIS Coordinator
Address Type mailing address
Address State House Station 174
City Augusta
State or Province ME
Postal Code 04333-0174
Country USA
Contact Voice Telephone (207) 624-7700
Contact Facsimile Telephone (207) 287-3842
Hours of Service Monday through Friday 0800 - 1700 EST
Distribution Liability Users must assume responsibility to determine the usability of this data for their purposes.
Format Name WMS
Format Version Number 1.1
Format Specification OpenGIS (OGC) Web Map Service (WMS)
[accinstr]  The Maine Office of GIS and the GeoLibrary Board provide web mapping services to distribute aerial photos and other digital data. A WMS is not a web application which you can see in a web browser; rather, it requires you to add the service to a GIS software application.
[smdistty]  1
Fees None
Ordering Instructions http://www.maine.gov/geolib/wms.htm
Metadata Reference Information
Metadata Date 20100305
Metadata Review Date 
Metadata Future Review Date 
Metadata Contact
Contact Organization (MEGIS) Maine Office of Geographic Information Systems
Contact Person GIS Coordinator
Contact Position GIS Coordinator
Address Type mailing address
Address State House Station 174
City Augusta
State or Province ME
Postal Code 04333-0174
Country USA
Contact Voice Telephone 207 624-7700
Contact Facsimile Telephone 207 287-3842
Hours of Service Monday through Friday 0800 - 1700 EST
Metadata Standard Name FGDC-STD-001-1998
Metadata Access Constraints none
Metadata Use Constraints none
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