2008 Hamilton County Orthoimagery
Dataset Basics
The Hamilton County 2008 digital natural-color orthophotography
was collected during April leaf-off conditions at a resolution of 6-inch resolution. The data cover the entire land area of Hamilton County, Indiana, or 434 square miles. Data are delivered tiles, consisting of 2500'x 2500' uncompressed 24-bit natural color TIFF files. Accuracy is +/- 3.33 feet. The entire perimeter of the county is buffered by at least 2,000 feet. Adjacent flight lines overlap by a minimum of 30 percent. Imagery was collected with the Leica ADS40 digital pushbroom sensor. The file naming convention is as follows: xxxyyyy where xxx and yyyy represent the easting and northing coordinates (respectively) in state
plane feet, divided by 1000, of the tile origin (the bottom-left
pixel). TIFF files are approximately 75 MB in size. Ownership of the data products resides with Hamilton County.
Available Datasets
2008 Hamilton County Orthophotography (GeoTIFF)
Imagery from the 2008 orthoimagery project conducted by Hamilton County.
Metadata from Vendor
Bounding Coordinates:
West Bounding Coordinate: -088.160700
East Bounding Coordinate: -084.688200
North Bounding Coordinate: +41.775300
South Bounding Coordinate: +37.755400
Use Constraints:
It is requested that the Hamilton County be cited in
any products generated from this data. The following
source citation should be included: [2008 Hamilton County
Orthophotography (www.co.hamilton.in.us)].
Contact Information:
Contact Organization: Hamilton County
Contact Person: Larry Stout
Contact Position: GIS Director
Contact Address:
1 Hamilton County Square, Suite 206
City: Noblesville
State: Indiana
Postal Code: 46060
Telephone: (317)-776-8254
Dataset Credit:
This data set was acquired for the Hamilton County by
Woolpert, Inc., quality assurance was provided by
The Schneider Corporation.
Data Quality Information:
Attribute Accuracy Report:
The digital orthophotos were evaluated by The Schneider Corporation to ensure each tile extent was 2500 feet x 2500 feet in Eastings and Northings for the appropriate Indiana State Plane
coordinate system, that the world file references the center of the pixel located in the upper left hand corner of the tile as the point of origin, that the ground sample distance (GSD) is 6-inches.
Logical Consistency Report:
Compliance with the accuracy standard was ensured by comparison with previously acquired orthophotography and planimetric data.
Completeness Report:
The following methods are used to assure imagery
accuracy.
1. Use of IMU and ground control network utilizing GPS
techniques.
2. Use of airborne GPS in conjunction with the acquisition
of imagery.
Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The orthophotos were compiled to meet 3.3 feet horizontal accuracy at 95% confidence level.
Grid Coordinate System Name: State Plane Coordinate System 1983
SPCS Zone Identifier: 1301
Scale Factor at Central Meridian: .9999666667
Longitude of Central Meridian: -037.300000
Latitude of Projection Origin: +85.400000
False Easting: 100000.00
False Northing: 250000.00
Planar Coordinate Information:
Planar Coordinate Encoding Method: coordinate pair
Coordinate Representation:
Abscissa Resolution: 1.0 and .5
Ordinate Resolution: 1.0 and .5
Planar Distance Units: Survey Feet
Geodetic Model:
Horizontal Datum Name: North American Datum of 1983,1986 Adjustment
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378137.000
Denominator of Flattening Ratio: 298.2572221010