EarthData International 20050308 Contours2004 vector digital data Contours2004 withheld This metadata record describes the development of a bare earth digital terrain model and contours from lidar of Rutherford County. Rutherford County has contracted the production of digital terrain models and contours from LIDAR data to support land-use planning, risk-assessment and emergency response agencies. en 20050308 Publication Date Complete Unknown -86.703807 -86.141303 36.102035 35.616926 1760579.136488 1926502.531478 467977.625389 643850.639793 EDI Thesaurus LIDAR Digital Elevation Model Reflective Surface Digital Terrain Model Bare Earth Breaklines Contours Geographic Names Information System Rutherford County Tennessee None None Earth Data International Raquel Charrois Project Manager mailing and physical address
7320 Executive Way
Frederick Maryland 21704 USA (301)948-8550 Mon - Fri 9:00 am to 5:00 pm ESRI ArcCatalog 9.2.2.1350 Feature Class This data has been produced to be fully compliant with National Map Accuracy Standards for mapping at a scale of 1 to 1,200. Compliance with the accuracy standard was ensured by the placement of GPS ground control prior to the acquisition of aerial photography. The following checks were performed. 1. The ground control and airborne GPS/IMU data stream were validated through a "bore site" calibration sensor overflight. 2. The lidar was checked against the project control. The technician visited and confirmed the accuracy of the points during initial processing. The following methods are used to assure imagery accuracy. 1. Use of IMU and ground control network utilizing GPS techniques. The following software was used for the validation. 1. Bentley - Microstation 2. Terrasolid - Terrascan 3. Trimble - Terramodeler 4. ESRI - ArcInfo 6. EarthData Proprietary software Ensuring the National Standard for Spatial Data Accuracy (NSSDA) published by the Federal Geographic Data Committee (FGDC) in 1998 standards are met. The LIDAR data fully complies with National Map Accuracy Standards for production of 2 foot contours. The LIDAR data fully complies with National Map Accuracy Standards for production of 2 foot contours. BWSC 20060406 GPS Ground Control model 1200 electronic mail system 20040224 20040226 Ground Condition Ground Control BWSC, under contract to EarthData International of Maryland targeted 50 locations prior to aerial imagery acquisition. The points were surveyed using GPS for both vertical and horizontal coordinate values. Ground control references Tennessee State Plane NAD83, NAVD88 both in US Survey Feet. EarthData Aviations 20040412 Rutherford County LIDAR Acquisition profile 1200 firewire 20040311 20040322 Ground Condition Acquisition The LIDAR acquisition for Rutherford County was flown to support the creation of 2 inch pixel. The LIDAR data was acquired in three sorties at 6000 feet AMT using the Leica ALS40 sensor. EarthData has developed a unique method for processing lidar data to identify and remove elevation points falling on vegetation, buildings, and other aboveground structures. The algorithms for filtering data were utilized within EarthData's proprietary software and commercial software written by TerraSolid. This software suite of tools provides efficient processing for small to large-scale, projects and has been incorporated into ISO 9001 compliant production work flows. The following is a step-by-step breakdown of the process. 1. Using the lidar data set provided by EarthData, the technician performs calibrations on the data set. 2. Using the lidar data set provided by EarthData, the technician performed a visual inspection of the data to verify that the flight lines overlap correctly. The technician also verified that there were no voids, and that the data covered the project limits. The technician then selected a series of areas from the dataset and inspected them where adjacent flight lines overlapped. These overlapping areas were merged and a process which utilizes 3-D Analyst and EarthData's proprietary software was run to detect and color code the differences in elevation values and profiles. The technician reviewed these plots and located the areas that contained systematic errors or distortions that were introduced by the lidar sensor. 3. Systematic distortions highlighted in step 2 were removed and the data was re-inspected. Corrections and adjustments can involve the application of angular deflection or compensation for curvature of the ground surface that can be introduced by crossing from one type of land cover to another. 4. The lidar data for each flight line was trimmed in batch for the removal of the overlap areas between flight lines. The data was checked against a control network to ensure that vertical requirements were maintained. Conversion to the client-specified datum and projections were then completed. The lidar flight line data sets were then segmented into adjoining tiles for batch processing and data management. 5. The initial batch-processing run removed 95% of points falling on vegetation. The algorithm also removed the points that fell on the edge of hard features such as structures, elevated roadways and bridges. 6. The operator interactively processed the data using lidar editing tools. During this final phase the operator generated a TIN based on a desired thematic layers to evaluate the automated classification performed in step 5. This allowed the operator to quickly re-classify points from one layer to another and recreate the TIN surface to see the effects of edits. Geo-referenced images were toggled on or off to aid the operator in identifying problem areas. The data was also examined with an automated profiling tool to aid the operator in the reclassification. 6.The data were separated into a bare-earth DEM. A grid-fill program was used to fill data voids caused by reflective objects such as buildings and vegetation. The final DEM was written to an ASCII XYZ format. 7. The reflective surface data were also delivered in ASCII Grid format. withheld 20040624 withheld EarthData International Raquel Charrois Project Manager mailing and physical address
7320 Executive Way
Frederick MD 21704 USA (301)948-8550 This process describes the method used to compile breaklines to support the lidar digital elevation model data. Around the perimeter of the lidar data set to complete the surface model all breaklines were photogrammetrically derived . The following step-by-step procedures were utilized for breakline development. The breakline file contains three dimensional accurate line strings describing topographical features. The relationship of lidar points to breaklines will vary depending on the complexity and severity of the terrain. Breaklines are collected where necessary to support the final product. Examples of some such locations include along the edges of roads, stream banks and centerlines, ridges, and other features where the slope of the terrain changes. 1. Using the ADS40 imagery provided by EarthData Aviations the technician loaded the data into the ISTAR processing system. Aerotriangulation is perfumed and stereo pairs created. 2. Stereo pairs are then imported in to the ZI SSK softcopy mapping system. 3. Breakline data was captured in the MicroStation environment, which allowed the photogrammetrist to see graphically where each lidar X, Y, and Z point and any breaklines fall in relation to each other. This unique approach allowed for interactive editing of the breakline by the photogrammetrist. The technician generated a set of temporary contours for the stereo model in the ZI work environment to provide further guidance on the breakline placement. The technician added and/or repositioned breaklines to improve the accuracy as required. Once these processes were completed, the temporary guidance contours were deleted, and the data was passed to the editing department for quality control and formatting. 4. The breakline data set was then put into an ESRI shape file format. withheld 20040705 withheld EarthData International Raquel Charrois Project Manager mailing and physical address
7320 Executive Way
Frederick MD 21704 USA (301) 948-8550 EarthData International generated 2 foot contours from the Lidar Bare Earth DEM and supplemental breaklines by using the following methodology. The contours were generated and edited using the following software packages. 1. MicroStation V8 2. TerraScan 4.14 3. TerraSolid 4.008 Using TerraScan the Lidar points were edited, thinned, merged with the breaklines and smoothed. Terramodel was used to generate the contours. Elevation and Index were the attribute fields which represent each contour line. The contours were cut into sheets and delivered in shape file format. withheld 20040903 withheld EarthData International Raquel Charrois Project Manager mailing and physical address
7320 Executive Way
Frederick MD 21701 (301) 948-8550 Metadata imported. withheld 20070810 Dataset copied. withheld 20080626 Dataset copied. withheld 20080627 Dataset copied. withheld 20080627 0 Vector Simple Polyline FALSE 1146885 TRUE TRUE String 1146885 coordinate pair 0.000118 0.000118 survey feet Lambert Conformal Conic 35.250000 36.416667 -86.000000 34.333333 1968500.000000 0.000000 North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 NAD_1983_StatePlane_Tennessee_FIPS_4100_Feet North American Vertical Datum of 1988 0.250000 Meters Explicit elevation coordinate included with horizontal coordinates Rutherford County Barbara Seivers mailing and physical address
104 Rutherford County Courthouse
Murfreesboro TN TN (615) 907-3155 None Downloadable Data 20070813 EarthData International Raquel Charrois Project Manager mailing and physical address
7320 Executive Way
Frederick MD 21701 (301) 948-8550 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 en local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile Rutherford County LIDAR 20121211 17001000 FALSE 20070813 08463900 20070813 08463900 1.0 ESRI ArcCatalog 9.2.2.1350 Contours2004 1760579.136488 1926502.531478 643850.639793 467977.625389 1 -86.703807 -86.141303 36.102035 35.616926 1 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 withheld Local Area Network Feature Class NAD_1983_StatePlane_Tennessee_FIPS_4100_Feet 1146885 Contours2004 Feature Class 1146885 OBJECTID OBJECTID OID 4 10 0 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. ELEV ELEV Double 8 11 0 TYPE TYPE String 12 0 0 SHAPE SHAPE Geometry 4 0 0 Feature geometry. ESRI Coordinates defining the features. SHAPE.len SHAPE.len Double 0 0 0 20070813