Louisville District- Topographic Survey

SEAS completed approximately 142 acres between 2 sites. The survey consisted of collecting and displaying all planimetric features such as buildings, sidewalks, inlets, all visible utility lines, and more.

SEAS performed a topographic survey of approximately 100-acres of an existing skeet range and adjacent wooded areas. The topographic survey included the location of all planimetric features within the survey limits. This included but was not limited to fixed improvements such as roadways, visible utilities, road culverts, fences, manholes (with inverts), inlets, catch basins, fire hydrants and water valves, all visible utility lines, boxes and signs including electric, phone, cable, gas and water.

The survey effort consisted of the following tasks:

• Established / set two horizontal and vertical control points to perform the survey and bring the subject parcel to the desired state plane grid and published elevation
• Established a north / south baseline to perform the topographic survey of the subject parcel at the desired grid interval
• Cut grid lines and collected topographic data along the desired grid interval. The grid interval was set at 100-feet. Data was collected between and along grid lines as needed to capture terrain changes and features that were located between and along the grid lines
• Surveyed all planimetric features within the survey limits

DATA COLLECTION: SEAS used Topcon GR3 dual frequency GPS receivers to establish site control and perform topographic data collection in the open areas of the project. SEAS used a Leica 1203 robotic total station with onboard data collection to collect topographic data within the heavily wooded areas. All the data collection was point and line coded per USACE Louisville AEC CADD standards. A portion of the survey area was located on an existing skeet range, coordination with base operations were necessary to close the skeet range for the survey effort. The north portion of the survey area was located on an existing taxi way, coordination with flight line operations was necessary to provide an escort for the surveying effort that was on the taxi way.

DATA PROCESSING: After completion of the data collection, the raw data files were reviewed to ensure that the data file matched the coordinates of the control points, field book inputs and all collected data points had the correct rod height and code attached. Those data points with mismatched codes were corrected and those points that were deemed repetitive, unusable, or inaccurate where deleted from the raw data file with the deletion being noted in the field book. This data was then processed using Magnet Office software. Once the final coordinates were established an adjustment was made both horizontally and vertically to arrive at the final deliverable coordinates.