Indiana Spatial Data Portal

Dataset Basics

Woolpert acquired new ADS40 color aerial photography at 0.5-foot pixel resolution covering 396 square miles encompassing all of Marion County plus a one mile buffer outside the county and the distance required to extend to edge of the county's tile grid on all sides .The aerial photography was acquired at an appropriate altitude capable of producing 1"= 100' scale countywide digital orthophotography mapping at 0.5-foot pixel resolution. Woolpert acquired Marion County, Indiana, digital imagery on March 02, March 13, and March 17, 2009. All digital imagery was acquired at a sun angle meeting or exceeding 30 degrees.

Woolpert targeted ± 30 existing horizontal and vertical ground control points and provide airborne GPS to support the digital orthophotography mapping production.

The horizontal datum used for this project was North American Datum 1983 (NAD83), Indiana State Plane Coordinate System, East Zone, and expressed in U.S. Survey Feet. The vertical datum used for this project was North American Vertical Datum 1988(NAVD88). This control was sufficient to meet the required accuracy necessary to support the subsequent mapping.

Woolpert produced a new color digital orthophotography countywide coverage area at 1"= 100' scale with 0.5-foot pixel resolution. The orthophoto tiling format followed a modular layout, with each 1"= 100' scale image covering 2,500' x 2,500' defined by even NAD-83 Indiana State Plane Coordinate grid lines. Orthophoto tiles were clipped to eliminate overlap between adjacent tiles. The file size for each tile was 75 MB. Woolpert used an interactive mosaicking process for tone balancing and image mosaicking. Full tiles were used for both the interior and perimeter of the project area. The above digital orthophotography will be in .TIFF format with a .TIFF world file for geo-referencing.

Available Datasets

File Format

Description:
Abstract: Color digital orthophotography countywide coverage area at 1"= 100' scale with 0.5-foot pixel resolution. The orthophoto tiling format will follow a modular layout, with each 1"= 100' scale image covering 2,500' x 3,500' defined by even NAD-83 Indiana State Plane Coordinate grid lines. Orthophoto tiles will be clipped to eliminate overlap between adjacent tiles. The file size for each tile will be 75 MB.
Purpose: This digital orthophotography for Marion County, Indiana, (including a 1 mile buffer) will be used in the enterprise GIS. One of the primary uses will be to update the planametric base map information for Marion County, therefore considerations used during production include minimizing shadows, minimizing building "lean" with adequate sidelap flights, and optimal placement of seam and mosaic lines along features.
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20090420
Single_Date/Time:
Calendar_Date: 20070402
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -86.355360
East_Bounding_Coordinate: -85.917210
North_Bounding_Coordinate: 39.951144
South_Bounding_Coordinate: 39.613098
Keywords:
Theme:
Theme_Keyword_Thesaurus: Raster
Theme_Keyword: Orthophoto
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: United States
Place_Keyword: Marion
Place_Keyword: Indiana
Place_Keyword: Indianapolis
Temporal:
Temporal_Keyword: Spring
Temporal_Keyword: 2009
Access_Constraints: This data may be used by the requested party for stated purposes and should not be re-distributed.
Use_Constraints: This data is for planning purposes only and should not be used for legal or cadastral purposes.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Information Services Agency
Contact_Person: Chuck Carufel
Contact_Address:
Address_Type: mailing and physical address
Address: 200 East Washington Street, Suite 2441
City: Indianapolis
State_or_Province: Indiana
Postal_Code: 46204
Country: USA
Contact_Voice_Telephone: 317.327.4957
Contact_Electronic_Mail_Address: ccarufel@indygov.org
Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.1.3000
Cross_Reference:
Citation_Information:
Originator: Woolpert, Inc.
Publication_Date: Unknown
Title: Ortho Tiles
Data_Quality_Information:
Logical_Consistency_Report: This orthophoto image follows the modular layout, with each 1"= 100' scale image covering 2,500' x 3,500' defined by even NAD-83 Indiana State Plane Coordinate grid lines. The area of coverage for orthophoto imagery indicates the full area covered by the footprint feature class.
Completeness_Report: This feature class represents one image within the the complete set of data for the image tiles within Marion County.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: In accordance with the specifications of the RFP, the digital orthophotography and topographic data produced for this project was consistent across the entire project area, and met the specifications of the county's GIS system. The processes and data was produced at National Map Accuracy Standards (NMAS) for 1"= 100' scale mapping.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 3.30
Horizontal_Positional_Accuracy_Explanation: The accuracy assessment was performed using a standard method to compute the root mean square error (RMSE) based on a comparison of field surveyed coordinate values and the measured coordinates on the orthophotos.
Vertical_Positional_Accuracy:
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Title: Marion County Digital Orthophoto
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20070420
Source_Currentness_Reference: ground condition