Identification_Information: Citation: Citation_Information: Originator: City of South Portland Publication_Date: 20050506 Title: South Portland 2005.lyr Description: Abstract: This OGC-compliant web mapping service (WMS) provides 6" pixel resolution orthoimagery of South Portland from May 6, 2005. This WMS is provided by the Maine Office of GIS and the Maine GeoLibrary Board. As the prime contractor, Bradstreet Consultants, Inc. used the aerial photography flown in one session on May 6, 2005, by Richard Crouse & Associates, Inc. of Frederick, MD who acquired approximately 1335 photos @ 1"=600' with airborne GPS using a Wild RC-30 (#13261) aerial camera. Bradstreet Consultants, Inc. painted and repainted ground targets for photo survey control points (~200) to support full analytical aerotriangulation. The aerotriangulation solution was used to set up each stereopair of photos for orthorectification and DTM compilation. The ortho imagery was created by scanning (14 microns (um) per pixel or 1815 dpi) the original 1"=600' scale film and employing a digital terrain model (DTM) from updating some town's original DTM and some town's from scratch using the 1"=600' scale negatives or diapositives using both analytical and softcopy (digital) stereoplotter in the Kork KDMS format. Purpose: Use in GIS for viewing and analysis along with sale to surveying, engineering, GIS and other intersted individuals and companies. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20050506 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -70.38 East_Bounding_Coordinate: -70.22 North_Bounding_Coordinate: 43.66 South_Bounding_Coordinate: 43.59 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: Digital orthophotos Theme_Keyword: Digital image map Theme_Keyword: Aerial photograph Theme_Keyword: Rectified photograph Theme_Keyword: Rectified image Theme_Keyword: Orthophoto Theme_Keyword: Ground sample distance .15m Place: Place_Keyword_Thesaurus: none Place_Keyword: South Portland Place_Keyword: Maine Access_Constraints: None Use_Constraints: Data should not be used beyond the scale of 1:2400. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Mark Bradstreet Contact_Organization: Bradstreet Consultants Contact_Position: President Contact_Address: Address_Type: mailing and physical address Address: 69 Peters Road City: Searsmont State_or_Province: ME Postal_Code: 04973 Country: USA Contact_Voice_Telephone: 207-621-8500 Contact_Electronic_Mail_Address: markb@bradstreet.com Data_Set_Credit: Data Set Produced by Bradstreet Consultants, Inc., 69 Peters Road, Searsmont, ME04973 www.bradstreet.com Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.1.1850 Data_Quality_Information: Completeness_Report: Orthoimagery for South Portland, Maine clipped to within about 100 feet beyond the town line. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The horizontal accuracy of the aerial photos is +/- 1 foot. Ground control used in aerotriangulation solution accurate to within 0.1 ft. Said solution was used to compile 1:1200 vector base mapping, which was subsequently used to control the orthorectification process. Vector data was compiled to meet ASPRS Class 1 accuracy standards. The orthorectification process was applied to the imagery and those features which are at ground level. No attempt was made to correctly rectify elevated structures as part of this project. Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Explanation: Comparison to Source Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Gound control used in aerotriangulation solution accurate to within 0.1 ft. Said solution was used to compile terrain data to support generation of 2 foot contour data. This elevation data was subsequently used to control the orthorectification process. The elevation data was compiled to meet ASPRS Class 1 accuracy standards. The orthorectification process was applied to the imagery and those features which are at ground level. No attempt was made to correctly rectify elevated structures as part of this project. Lineage: Source_Information: Source_Scale_Denominator: 6000 Type_of_Source_Media: Aerial photography film Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20050506 Source_Currentness_Reference: ground condition Process_Step: Process_Description: Bradstreet Consultants, Inc. used the aerial photography flown in one session on May 6, 2005, by Richard Crouse & Associates, Inc. of Frederick, MD who acquired approximately 1335 photos @ 1"=600' with airborne GPS using a Wild RC-30 (#13261) aerial camera. Bradstreet Consultants, Inc. painted and repainted ground targets for photo survey control points (~200) to support full analytical aerotriangulation. The aerotriangulation solution was used to set up each stereopair of photos for orthorectification and DTM compilation. The ortho imagery was created by scanning (14 microns (um) per pixel or 1815 dpi) the original 1"=600' scale film and employing a digital terrain model (DTM) from updating some town's original DTM and some town's from scratch using the 1"=600' scale negatives or diapositives using both analytical and softcopy (digital) stereoplotter in the Kork KDMS format. Cloud_Cover: 0 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: State Plane Coordinate System State_Plane_Coordinate_System: SPCS_Zone_Identifier: Maine West NAD83 Entity_and_Attribute_Information: Overview_Description: Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Mark Bradstreet Contact_Organization: Bradstreet Consultants Contact_Position: President Contact_Address: Address_Type: mailing and physical address Address: 69 Peters Road City: Searsmont State_or_Province: ME Postal_Code: 04973 Contact_Voice_Telephone: 207-621-8500 Contact_Electronic_Mail_Address: markb@bradstreet.com Resource_Description: Downloadable Data Metadata_Reference_Information: Metadata_Date: 20090629 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Bradstreet Consultants Contact_Person: Mark Bradstreet Contact_Position: President Contact_Address: Address_Type: mailing and physical address Address: 69 Peters Rd City: Searsmont State_or_Province: ME Postal_Code: 04973 Country: USA Contact_Voice_Telephone: 207-621-8500 Contact_Electronic_Mail_Address: markb@bradstreet.com 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 Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile