Identification_Information: Citation: 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.lyr Edition: 2008 Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: Maine Coastal Low Tide Ortho-rectified Digital Images (ODI) Issue_Identification: 2008 Publication_Information: 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://mapserver.maine.gov/wms/mapserv.exe?map=c:/wms/orthos.map& Description: 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: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 8-21-2008 Time_of_Day: unknown Single_Date/Time: Calendar_Date: 8-22-2008 Time_of_Day: unknown Currentness_Reference: flight date Status: Progress: Complete Maintenance_and_Update_Frequency: Irregular Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -68.814148 East_Bounding_Coordinate: -67.994664 North_Bounding_Coordinate: 44.628199 South_Bounding_Coordinate: 43.973918 Keywords: Theme: Theme_Keyword_Thesaurus: Maine GIS Thesaurus-Theme Theme_Keyword: aerial photograph Theme_Keyword: ortho-rectified digital image Theme_Keyword: ground sample distance 0.5 meters Theme_Keyword: OTHER SCALES Theme_Keyword: IMAGERY AND REMOTE SENSING Place: Place_Keyword_Thesaurus: Maine GIS Thesaurus-Place Place_Keyword: Maine Stratum: Stratum_Keyword_Thesaurus: GCMD Parameter Keyword Stratum_Keyword: land surface 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Maine Department of Marine Resources Contact_Person: Seth Barker Contact_Position: GIS Manager Contact_Address: 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 Data_Quality_Information: 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. These images are available as an OGC-compliant WMS. The imagery covers a portion of the Maine coastline. The imagery consists of 3 bands - red, green, and blue. Completeness_Report: The Coastal Maine Low Water Ortho-rectified Digital Images were acquired by the Maine Department of Marine Resoures to provide low tide orthophotography for eelgrass mapping, oil spill response planning, and other low tide and shallow subtidal mapping. Positional_Accuracy: Horizontal_Positional_Accuracy: Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Explanation: Digital file features provide a digital photographic map suitable for applications requiring a 1:2400 National Map Accuracy Standard (NMAS). Lineage: Source_Information: Source_Citation_Abbreviation: MeDMR Process_Step: Process_Description: Data captured. Process_Date: 20080821 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: J. W. Sewall Company Contact_Person: Nicol Cyr Contact_Position: Imaging Production Manager Contact_Address: 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_Step: 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 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: (MEGIS) Maine Office of Geographic Information Systems Contact_Address: Address_Type: mailing address Address: State House Station 145 City: Augusta State_or_Province: ME Postal_Code: 04333-0145 Country: USA Contact_Voice_Telephone: (207) 624-7700 Contact_Facsimile_Telephone: (207) 287-4563 Hours_of_Service: Monday through Friday 0800 - 1700 EST Process_Step: 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. Cloud_Cover: 0 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 19 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -69.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 0.500000 Ordinate_Resolution: 0.500000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Resolution: 1.000000 Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: (MEGIS) Maine Office of Geographic Information Systems Contact_Address: Address_Type: mailing address Address: State House Station 145 City: Augusta State_or_Province: ME Postal_Code: 04333-0145 Country: USA Contact_Voice_Telephone: (207) 624-7700 Contact_Facsimile_Telephone: (207) 287-4563 Hours_of_Service: Monday through Friday 0800 - 1700 EST Resource_Description: OGC-compliant web mapping service available at: http://mapserver.maine.gov/wms/mapserv.exe?map=c:/wms/orthos.map& Distribution_Liability: Users must assume responsibility to determine the usability of this data for their purposes. Standard_Order_Process: Custom_Order_Process: Data may be ordered through Sewall Company. Metadata_Reference_Information: Metadata_Date: 20090305 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: (MEGIS) Maine Office of Geographic Information Systems Contact_Person: GIS Manager Contact_Address: Address_Type: mailing address Address: State House Station 145 City: Augusta State_or_Province: ME Postal_Code: 04333-0145 Country: USA Contact_Voice_Telephone: (207) 624-7700 Contact_Facsimile_Telephone: (207) 287-4563 Hours_of_Service: Monday through Friday 0800 - 1700 EST Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile