Indiana Spatial Data Portal

Dataset Basics

Hamilton County acquired imagery during leaf-off, cloudless conditions April, 2007, at a resolution of 6-inch. The data cover the entire land area of Hamilton County, Indiana, or 434 square miles. The county's vendor Kucera International, 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.

It is requested that Hamilton County be cited in any products generated from this data. The following source citation should be included:[2007 Hamilton County Orthophotography (www.co.hamilton.in.us).

The Indianapolis Mapping and Geographic Infrastructure System (IMAGIS) staff provided a copy of the TIFF and MrSID MG3 images to University Information Technology Services at Indiana University. UITS created GeoTIFFs with JPG compression and ECW compressed images.

Available Datasets

[collection id=71332]

File Formats

Each image is archived in a .zip file which includes the image and all ancillary files provided to UITS.

Tiles
Cell Size (X,Y): 0.5, 0.5
Pixel Type: Unsigned integer; Pixel Depth: 8 Bit
Units: Feet
File formats: Untiled GeoTIFF, GeoTIFF with JPG compression (75 % quality), and ECW
Dataset size: 1,936 images; 135.4 GB total size GeoTIFF format

Township Mosaics
Coordinate System: State Plane Indiana East 1301, NAD83, feet
Units: Feet
Target Compression Ratio: 20:1
Format: MrSID MG3

County Mosaic
Coordinate System: State Plane Indiana East 1301, NAD83
Units: Feet
Format: MrSID MG3 and ECW

Dataset Contact

Larry Stout, GIS Director, lcs@co.hamilton.in.us