This metadata record describes the Spring 2006 digital orthophotos produced for LOJIC. This 1:1200 scale orthophotography is comprised of natural color digital images collected with a GSD (Ground Sample Distance) of 0.5'. Imagery was collected with a Leica ADS40 digital sensor and processed with Leica GPro software
A digital orthophoto is a geometrically accurate photographic record of landscape conditions at the time of the corresponding aerial photography. As such, the digital orthophoto is useful for a variety of applications, such as environmental monitoring, facility engineering/maintenance, city/county planning, property line review, etc. The digital orthophoto can be used alone or as a raster basemap for corresponding vector line mapping.
The bounding coordinates in this metadata file represent the bounding coordinates for all image tiles at this scale within the project area as a whole, not an individual tile.
700 West Liberty Street
ground condition
Data access is restricted to LOJIC Participants, their contractors and Licensees only
LIMITATION OF LIABILITY: MSD and the participants of the Louisville/Jefferson County Information Consortium (LOJIC) have no indication or reason to believe that there are any inaccuracies or defects of information incorporated in this work and make NO REPRESENTATIONS OF ANY KIND, INCLUDING, BUT NOT LIMITED TO, THE WARRANTIES OF MERCHANTBILITY OR FITNESS FOR A PARTICULAR USE, NOR ARE ANY SUCH WARRANTIES TO BE IMPLIED, WITH RESPECT TO THE INFORMATION OR DATA, FURNISHED HEREIN.
| Boundary | Coordinate |
|---|---|
| Left | 1239000.000000 (survey feet) |
| Right | 1347001.000000 (survey feet) |
| Top | 380000.000000 (survey feet) |
| Bottom | 280000.000000 (survey feet) |
| Boundary | Coordinate |
|---|---|
| West | -85.653380 (longitude) |
| East | -85.271959 (longitude) |
| North | 38.538998 (latitude) |
| South | 38.260524 (latitude) |
Color orthophotos are comprised of pixels. Each pixel is assigned a value of 0 to 255. That number will refer to a color look-up table which contains red, green and blue (RGB) values, each from 0 to 255, for that pixel within the image.
None
Compliance with the accuracy standard was ensured by the placement of GPS ground control prior to the acquisition of aerial imagery. The following checks were performed: 1. The ground control and airborne GPS/INS data stream were validated through an aerotriangulation bundle adjustment using Leica's ORIMA and CAP-A software. 2. Digital orthophotography was validated through a visual inspection of control points, edge matching and general image quality.
The following methods were used to ensure image quality: 1. Use of targeted ground control during image acquisition. 2. Use of GPS/INS during image acquisition. 3. Checking of controls against ortho product. 4. Post ortho accuracy approval checks for overall image quality (tone, color balance, etc.).
This image complies with ASPRS Class I standards. It has been tested at 95% confidence level to have an RMS positional displacement within 1' of well defined ground features in obscured areas. Does not apply to vertical surface features, such as structures, appearing in the digital orthophotography due to inherent lean. Tested horizontal RMSE on controls within the project area is 0.7755 feet.
There is no vertical component for orthos.
The aerial imagery was captured with a Leica Geosystems ADS40 digital camera. The ADS40 uses a 'pushbroom' method of data collection with different sensors using forward, rearward and nadir orientations along planned flight lines. This results in one image per sensor for each flight line. The aerial images are used to AT the project and the production of orthophotos.
ground condition
Targeted ground control is used to create a digital control file and control report as well as QC check of ortho accuracy. Predefined points (usually NGS) within the county are targeted, making the points visible in the photography. These points along with their precise coordinates are used in the AT process and to check the horizontal accuracy of the resulting orthophotos. 50 control points were targeted for use throughout the project area.
Ground condition
The DEM was comprised of newly acquired LiDAR point data. The LiDAR data was classified to provide a 'bald earth' surface and then output to produce a 40' grid spacing DEM.
Ground condition
The tile definition contains the name and bounding coordinates for each tile in the image index and is used to cut orthorectified imagery into manageable, usable images. Each tile is 3010 X 4010 feet. It was provided to Kucera by LOJIC in vector format and references NAD83 Kentucky North state plane coordinates. Kucera converted to an ASCII text file for use in image processing software.
Ground condition
This first level of orthorectified images are the product of using the AT solution and the DEM in GPRO. They are large 4GB swaths that have yet to be mosaicked into manageable tiled orthos.
Ground condition
The tiled orthophoto is the result of mosaicking orthorectified imagery and using the tile definition to cut into manageable, usable orthophotos.
Ground condition
At selected locations throughout the site, accurate GPS coordinates and elevations are surveyed and the points are marked with targets which will be visible in the aerial photography.
Targeted ground control is used to create a digital control file and control report as well as QC check of ortho accuracy. Predefined points (usually NGS) within the county are targeted, making the points visible in the photography. These points along with their precise coordinates are used in the AT process and to check the horizontal accuracy of the resulting orthophotos. 50 control points were targeted for use throughout the project area.
Ground condition
New digital, color aerial imagery of the site is acquired using the Leica ADS40 camera. Airborne GPS/IMU data is recorded along with the imagery
The aerial imagery was captured with a Leica Geosystems ADS40 digital camera. The ADS40 uses a 'pushbroom' method of data collection with different sensors using forward, rearward and nadir orientations along planned flight lines. This results in one image per sensor for each flight line. The aerial images are used to AT the project and the production of orthophotos.
ground condition
Imagery and GPS/IMU data is downloaded from disc on the plane to disc on the ground. GPS/IMU mission data is processed together with simultaneously collected ground-based GPS base station data in forward and reverse directions. This precisely determines the aerial camera's position and orientation in the terrain (project) coordinate system and allows for correct orientation of the imagery.
The aerial imagery was captured with a Leica Geosystems ADS40 digital camera. The ADS40 uses a 'pushbroom' method of data collection with different sensors using forward, rearward and nadir orientations along planned flight lines. This results in one image per sensor for each flight line. The aerial images are used to AT the project and the production of orthophotos.
ground condition
The aerial imagery was captured with a Leica Geosystems ADS40 digital camera. The ADS40 uses a 'pushbroom' method of data collection with different sensors using forward, rearward and nadir orientations along planned flight lines. This results in one image per sensor for each flight line. The aerial images are used to AT the project and the production of orthophotos.
ground condition
Using the processed GPS/IMU data and correctly oriented imagery, a bundle adjustment is computed (AT) in Leica Geosystems ORIMA/CAP-A software.
Orthorectified imagery is produced using Leica Geosystems GPRO software. They are large 4GB swaths that have yet to be mosaicked into manageable tiled orthos.
This first level of orthorectified images are the product of using the AT solution and the DEM in GPRO. They are large 4GB swaths that have yet to be mosaicked into manageable tiled orthos.
Ground condition
Orthorectified imagery is mosaicked, locally color-balanced and cut to the tile definition boundaries using Stellacore OrthoVista software. The tiled orthos are checked for accuracy against the surveyed ground control before further image editing.
The tiled orthophoto is the result of mosaicking orthorectified imagery and using the tile definition to cut into manageable, usable orthophotos.
Ground condition
Tiled orthophotos then go through a rigorous manual QC process to evaluate for remaining hotspots (sun reflectance over water), tone quality, color balance and the feathering area between flight lines Any imperfections at this point are manually edited. If necessary, the tiled images are then converted to required format. All images are either recorded on DVD, transferred to HD or posted on FTP for client access.
The tiled orthophoto is the result of mosaicking orthorectified imagery and using the tile definition to cut into manageable, usable orthophotos.
Ground condition
The tiled orthophoto is the result of mosaicking orthorectified imagery and using the tile definition to cut into manageable, usable orthophotos.
Ground condition
Metadata imported.
Metadata imported.
Metadata imported.
LOJIC 1:1200 Digital Color Orthophotography (2006)
LOJIC provides the geographic data "as is". This organization makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. Also, this organization makes no warranty, either express or implied, regarding the condition of the product or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these files have been processed successfully on computers at this organization, no warranty is made by this organization regarding the use of these data on any other system, nor does the fact of distribution constitute or imply such a warranty.
PC with CDROM or DVD drive
700 West Liberty Street
Contact Jane Poole 502-540-6435 or Ken Bailey 502-540-6150
Contact LOJIC
700 West Liberty Street