Mapping Utilities with Mobile GIS Applications

Transcription

1 Mapping Utilities with Mobile GIS Applications Kristy M. Capobianco Reynolds, Smith and Hills, Inc. GIS Analyst (904) ESRI Southeast User Group Conference May 5, 2007

2 JEA JEA is the 8 th Largest Utility Company in the Country JEA Services 360,000 Electric Customers 240,000 Water Customers 184,000 Sewer Customers JEA Electric Owns 3 Generating Plants and Shares Ownership of 2 Others Total Generating Capacity Is 2,361 MW of Power JEA Water Uses Groundwater from 150 Wells. JEA Has 44 Water Treatment Plants and 3,480 Miles of Water Piping JEA Sewer Has 2,500 Miles of Collection Piping and 6 Waste Water Treatment Plants

3 Project Background Engineering, Construction and Services (EC&S) 50 Million Dollar a Year Program Manages Projects from Conception to Design to Permitting to Construction to Close Out

4 EC&S Problems Projects Are Established with Sometimes Millions of Dollars Allotted to Them Close Out of Projects/As-Builts Required Months of Time Slow Close Outs Left Large Sums of Money Encumbered Money That Should Be Used on Other Projects Accuracy of the As-Builts Are Sometimes, at the Least, Questionable Information Needed for JEA Crews with Leakage Problems

5 Solution Take the As-Built Responsibilities from the Contractor Use GPS/GIS Technology to Increase Accuracy Continue with AutoCAD Drawings for Operations Personnel Include GIS Maps for Data Evaluation and Hydraulic Analysis Allows for a QA/QC Evaluation During Construction

6 New JEA Specifications Standard Requirements for JEA Contractors All contracts now include requirements which allow for more accurate As-Builts at a faster pace Stand pipe at every 100 feet allows a great degree of information for future maintenance crews Shooting every fitting and valve provides exact information immediately during emergencies regarding which valves must be closed Benchmark every 500 feet ensures the GPS Technician need only set up once for many points required Allows immediate QA/QC on the final product

7 Pipe Construction

8 Data Collection Methodology GPS Collection Standards The GPS data collector collects with a Trimble GeoXH handheld unit coupled with a Zephyr antenna to acquire the highest horizontal accuracy possible (sub- meter in field or better if H-Star H lock is acquired). The JEA As-Builts Data Dictionary shall be used for all projects undertaken. This Data Dictionary contains all the features, attributes and standards of data needed for the project. Mission planning must be conducted daily by the GPS data collector before heading into the field to determine the optimal time(s) for data collection. Some items that must be considered are PDOP and number of satellites available.

9 Data Collection Methodology Point Features (valves, fittings, stand pipes, benchmarks) All data will be collected using TerraSync software. Point features must have a minimum of 30 positions collected at a logging interval of 1 second. Line Features (water, sewer, reclaim main) Line features shall be collected using the averaged vertices method. This method allows several positions to be collected at each vertex (stand pipe), then averages these positions together to calculate one vertex position.

10 Differential Correction Differential correction (post-processing) must be conducted on each file that is downloaded from the GPS receiver. This process will output a summary of estimated accuracies for all corrected positions. If features fall outside the acceptable range of accuracy (3-feet) they must be recollected by the GPS data collector.

11 Differential Correction After post-processing all data are exported as ESRI shapefiles with the same coordinate system that the data was collected (US State Plane 1983, Florida East, NAD83 Feet). The following attributes are generated on creation: Time and Date Recorded, Horizontal Precision, and Position (Northing and Easting).

12 Shapefile Creation and Editing

13 SAMPLE GIS MAPS

14 Data Storage File Geodatabase Easily and logically stores GIS data. Each draft has its own feature dataset that is populated with the newly created data. Feature-Linked Annotation If an attribute of the GIS feature class is changed/deleted the annotation will automatically update with changes to the feature class.

15 Conversion to CAD Format ArcInfo License DWG 2004 format (JEA Standard). Select feature (valve, fitting, etc.) along with the annotation layer. JEA STANDARD

16 Conversion to CAD Format

17 Creation of As-Built Plans

18 Next Steps: 3D Profile View

19 Benefits of GPS Data Collection Savings Over Contractor s s Costs Lake Forest Contractor at $105,000 JEA Collection & As Built Costs at $71,336 Savings on One Job of $33,664 or 32% Improvement of the Accuracy of the Drawings 85% of Data Is Within 15 cm or Less Than 1 Foot Closeout Contracts Sooner Releasing Funding Accurate QC & QA as the Project Is Installed Increase the Speed of the Process with GPS Equipment vs. Old Survey Methods Indirect Costs Savings Less Administrative Costs Due to Long Closeout Periods Import Directly into GIS Database GIS Shapefiles for the Records Department AutoCAD for Design Engineers

20 Questions? Contact Information: Kristy M. Capobianco Reynolds, Smith and Hills, Inc. GIS Analyst (904)