Presentation on theme: "Design to Improve the Productivity and Execution of Gravity Surveys"— Presentation transcript:
1Design to Improve the Productivity and Execution of Gravity Surveys https://hazards.fema.gov/femaportal/wps/portal/!ut/p/c5/04_SB8K8xLLM9MSSzPy8xBz9CP0os3gDCyNfM_OAYGcLA2cjdwMnwwADKADKR2LKmxrD5fHrDgfZh18_WB4HcDTQ9_PIz03Vj9SPMscwxSLABGZKZE5qemJypX5BboRBlkmoIgDulWf9/dl3/d3/L0lDU0lKSWdrbUNTUS9JUFJBQUlpQ2dBek15cXpHWUEhIS80QkVqOG8wRmxHaXQtYlhwQUh0Qi83XzA4Mk02N1BTQzgwQzJHMEI5UDQwMDAwMDAwLzdoYllFNjcxNDAwNTQvc2EubGVnZW5kLkxlZ2VuZEZvcm1BY3Rpb24!/#7_082M67PSC80C2G0B9Phttps://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&docid=SC06goSEFfTi3M&tbnid=qdrtgfCHBDOx7M:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.nydailynews.com%2Fnews%2Fhurricane-sandy-strikes-east-coast-gallery &ei=21slUZFhtIbRAZ3OgeAK&psig=AFQjCNGZ9NxEcDTpqGKb1L8X5SahubO8bg&ust=Evan DemickKyle LuukkonenSadeep NonisYuri ZhylenkoSponsor: Sandra Preaux - NOAA
2Agenda Context Review Stakeholder Analysis Problem & Need Statements Method of Analysis & SimulationRecommendation & Conclusion
3What is a Gravity Survey? Collection of measurements of the acceleration of gravity.Accelerations are used to model the earth’s geoid.The geoid model is usedto determine elevations.Mountains have greater massthan a valley, so the pull ofgravity is stronger nearmountains
4Importance of Gravity Surveys Accurately measure the height and flow of water in flat areas to make efficient use of water resources.Variations in gravity represent different densities beneath the surface.Variations may represent petroleum, natural gas, and various metals.Plan evacuation routes for low lying coastal areas.FEMA requires the use of survey data for flood control certificates.
5History of Gravity Surveys National Geodetic Vertical Datum of 1929 (NGVD 29)Originally known as the Sea Level Datum of 1929.Based on mean sea level (MSL) at 26 tidal gauges between the United States and Canada.21 in the U.S. and 5 in CanadaDefined by the observed heights at each tidal gauge and the elevations of all benchmark locations.MSL is not a constant.Impacted through wind, atmospheric pressure, water temperature and salinity.
6History of Gravity Surveys North American Vertical Datum of 1988NAVD ‘88 was established in 1991 to replace NGVD 29’.Data points collected through geodetic leveling and satellites.Data is very sparse.Errors in measurements as high as 2 meters.Majority of data collected in the 70’s and 80’s.
7Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Created in 2007 to complete a thorough survey of the gravity field over the United States and it’s territories.NGS Federally Mandated project (80-373).Designed to replace existing gravity measurements from NAVD ‘88.Could see a potential economic benefit of $4.8 billion over fifteen years.Based primarily on flood plain mapping and avoidance costs for leveling.
8Logistics DiagramNeed to add an aditional slide either before or after this to elaborate more on this process.Need to talk about our data distributions at this point (at least introduce them to the audience so they can get a feel for where they are coming from) and talk about how they play a role in the process.
9Annual Target Identification FY13FY14FY15FY16FY17FY18FY19FY20FY21FY2228%36%44%52%60%68%76%84%92%100%Percentages represent the annual goals for the GRAV-D project starting in FY2013.Currently, NOAA has been reaching their yearly targets of 5.6% per year.NOAA will need to increase yearly output to 8% to reach 2022 completion goal.We need an exact percentage for out target instead of 5-6%.It would also be helpful to show the yearly breakdown of past surveys instead of this estimate.
11Historical Survey Data Timeframe – 2008 through 2012Important factorsWeather, Aircraft Maintenance, Aircraft Repair, Instrument Issues, and Personnel Days.Need to add in the exact start date and the “end” date for this set of data. Probably sometime in 2008 (if anyone knows a month, good) and ending in Its easy for us to see, but we can add some text below with the specifics.Also might want to point out any outliers.
13Historical Data Distributions FactorsType of DistributionMean(days)Standard DeviationSquare ErrorAircraft MaintenanceBeta5.578.180.036Aircraft Repair3.856.770.025Equipment Repair2.143.800.035Weather Delay4.984.000.021Personnel DayGamma3.061.840.005Need to rank these by their importance.Also need to discuss the difference between maintenance and repair (one is scheduled, the other is not). Probably should talk about this at the cartoon.
14Deming’s TheoryTheory - Anomalies in quality are variations outside the control limits of a process.W. Edwards DemingTo meet program target completion goals the variation of the delays in each process must be reduced.Quality Variance
15Agenda Context Review Stakeholder Analysis Problem & Need Statements Method of Analysis & SimulationRecommendation & Conclusion
16Stakeholder Relationship Diagram Drive home the positives and the negatives. So, who helps the process.Also talk through the loops instead of just randomly pointing.
17Planning Stakeholders ObjectivesTensionsNOAAResponsible for project management.Limited funding for implementing gravitational survey.Airplane ContractorsSupports gravitational survey objectives.Limitations on flight paths and aircraft use.Pilots and Support CrewsMain objective is to collect physical data.Limited amount of time and funding.Department of CommerceProvides funding for project.Requires annual completion targets.ResidentsReceive elevation measurements.Needs to give additional support to NOAAFEMAAcquire the survey data for flood control certificates.Limited on survey data completed for flood control certificates.Again, Positives and Negatives. Also, don’t just read off of this.
19Execution Stakeholders ObjectivesTensionsNOAAResponsible for project management.Limited funding for implementing gravitational survey.PilotsFlies the planes to allow the data to be collected.Limited hours that can be flown.Ground CrewsRepairs the planes.Limited amount of time and supplies or parts for repairs.SurveyorsCollects the physical datum.Limited amount of time and accuracy with equipment.
20Agenda Context Review Stakeholder Analysis Problem & Need Statements Method of Analysis & SimulationRecommendation & Conclusion
21Problem StatementNOAA has to reach 8% geographic area coverage annually.A plan to reduce variability within the gravitational survey is needed to maximize coverage within budget.Before Fiscal Year 2022
22Need StatementNOAA must complete the 8% annual quota but receives limited funding from the Department of Commerce.Making the gravity survey reduce variability will remove the tension with the Department of Commerce on NOAA’s need for more financial backing by decreasing the time needed to complete a survey block.Lets see if we can combine the problem and need into one clear slide.
23Agenda Context Review Stakeholder Analysis Problem & Need Statements Method of Analysis & SimulationRecommendation & Conclusion
24Design Alternatives Alternative 1 Alternative 2 Alternative 3 Focus on Logistics ProcessImprove the execution of gravitational surveys and reduce variance in several variables which cause extra delays and unnecessary downtime.Alternative 2Acquire additional resourcesThe number of aircraft, equipment suites, and personnel limits the amount of surveys that can be completed annually.Alternative 3Combine Alternatives 1 & 2Maximizes the output, but is constrained by budget.These are items that may need to be introduced in the context
25Value Hierarchy US Gravity Survey Availability (0.35) Area Coverage (0.43)Time(0.22)Get rid of budget and make utility vs costNeed to add in the utility chartRank each process based on difficulty to implement.
26Black Box ModelExplain each part of this (inputs and outputs), don’t leave anything out
27SimulationUsed historical data to build a distribution for each process block.Assume process independence.Run the simulation for 10,000 replications and compare results.Make sure to talk through the simulation and explain each part of it!!
28Verification – Data Comparison Simulation Output (Base Case)Mean: daysWorst case: daysHistorical Data AnalysisMean: daysWorst Survey: 76 daysWorst Values: 130 daysExplain where these come from
29Verification – Data Correlation Weather DelayAircraft MaintenanceAircraft RepairEquipment RepairPersonnel Day1-0.21-0.0660.490.17-0.160.62-0.029-0.240.33May need a new titleWhat should the takeaway be from this slide??? Need to add text and talk about why we did this and make the case that these are independent.Symmetric correlation coefficientNegative relationship – As the duration of one process increases, the duration of the corresponding process decreasesPositive relationship – As the duration of one process increases, the duration of the corresponding process increases
30Design of ExperimentReduce the variance of each input variable by 5%, 10%, 15%, 20%, and 25%.Run 10,000 replications after each change.Calculate the days to completion.(10%) = (μ - min) * min(50%) = μ(90%) = (max - μ) * μAnalyze which variables have the biggest impact on the survey by subtracting the new value from the base case.
31Data Analysis Inputs Outputs Process Variance Reduction 10% to completion (days)50% to completion (days)90% to completion (days)Aircraft Maintenance5%22.6743.9796.7910%22.6643.9296.3815%22.6443.8295.8020%22.9243.4492.8825%22.9843.3892.46Aircraft Repair43.9496.9522.6543.8896.7143.8496.4622.6343.8096.1922.6243.7495.87Equipment Repair22.7143.9996.9422.7443.9696.7022.7743.9396.4722.7943.8796.1622.9794.15Weather Delay44.0197.2044.0097.2497.2797.3097.31Personnel Day23.1623.1196.6623.0796.6123.0496.5723.0196.53Lablel the inputs and outputs (up top)Rank in terms of importance and circle the important parameters.
33Max Delay Reduction (days) Mitigation Strategies ResultsFactorsRank in VariabilityMax Delay Reduction (days)Mitigation StrategiesAircraft Maintenance14.70Additional maintenance personnel.Preventative maintenance.Aircraft Repair31.29Improved maintenance.Available spare parts.Equipment Repair23.01Back up equipment.Weather Delay5-0.15Weather analysis from regional historical data.Personnel Day40.63Schedule days off around other delays.Actually brief this slide and talk about it rather than just saying, here are resultsAlso rank 1 – 5, not 1,3,2…The preventative maintenance could be trouble, remember a,b,c,d checks for aircraft. I know them.
35Agenda Context Review Stakeholder Analysis Problem & Need Statements Method of Analysis & SimulationRecommendation & Conclusion
36RecommendationsAlternative 1 – Focus on the logistics process of the surveys by allocating budget and resources towards improving parameters based on their rank in variability.This method has the least cost while still providing good way for survey execution based on the output value.Follow delay mitigation strategies to maximize the performance and data gathering of the survey.Need to add quantitative data to this.
37ConclusionVariability reduction will reduce the time to conduct an average survey by days based on 25% variability reduction.More surveys will be completed in 44 days or less.Save up to 47.4 days of survey time annually.Enough time to conduct another survey.Fewer days spent on survey results in less spending.Mention where the 3 and 9 came from!Need to explain moreAdd chart of survey days on 25% variability reduction
40Design to Improve the Productivity and Execution of Gravity Surveys Evan Demick, Kyle Luukkonen, Sadeep Nonis, Yuri Zhylenko
41National Geodetic Survey The National Geodetic Survey (NGS) has a clearly defined mission statement:“Define, maintain and provide access to the National Spatial Reference System (NSRS) to meet our nation’s economic, social, and environmental needs.” (NOAA 2012)The National Geodetic Survey (NGS) is a government supported program that provides positioning information to the nation.NGS has several different projects currently underway (including GRAV-D and CORS) to aid in the measuring of elevation, longitude, latitude, and shoreline data.
42History of Gravity Surveys NAVD ‘88 was established in 1991 to replace the existing Sea Level Datum from 1929.Surface measurements were taken using a technique called leveling.Surveys were conducted over many years by numerous outside sources.Data is very sparse.Locations like Alaska have very few measurements due to terrain.A gap is also present along the coastlines.Need to consider doing a history of vertical datums.
43North American Vertical Datum Measurements are outdated and have been skewed due to crustal movements (last collected in the 70’s and 80’s).Many markings have been destroyed by regional development and poor maintenance.There is a transcontinental tilt from the SE to NW of the U.S. for short wavelength gravity measurements.Errors in measurements as high as 2 meters.
44Importance of Gravity Surveys FEMA requires the use of survey data for flood control certificates.Floodplain maps also determine whether or not homes or buildings require flood insurance under the National Flood Insurance ProgramA FEMA run program with over $650 billion in insured assets.Mapping gravity can improve the accuracy of atomic clocks which are used in many electronic systems.Provide measurements that are geographically continuous rather than points based on physical monuments.
45Importance of Gravity Surveys Floodplain maps are used to determine land use and building code requirements.Builders must have site plans and matching elevation data to help minimize any potential damage.Planning the development of new buildings and infrastructure.Variations in gravity represent different densities beneath the surface which can be used to detect petroleum, natural gas, and various metals.Mapping gravity can improve the accuracy of atomic clocks which are used in many electronic systems.Provide measurements that are geographically continuous rather than points based on physical monuments.
46Importance of Gravity Surveys Road construction currently uses conventional geodetic leveling.Upgraded gravity surveys could replace conventional leveling for road works and save state and local municipalities as much as $300 billion per year.Replace leveling for sewage systems, water supply, and mass transit activities.Monitor changes over time in crustal motion to predict earthquakes and water flow.
47GRAV-D ObjectivesRedefine the US vertical datum and replace geodetic leveling in large areas with GPS measurements and a gravimetric geoid model to determine orthometric heights.Redefine and improve the vertical component of NSRS.Provide a vertical datum that is more economical than traditional leveling.
48EquipmentA test mass is first dropped and allowed to fall freely inside a vacuum chamber.The test mass will fall roughly 7 cm and the actual distance will be measured precisely using a laser interferometer and a rubidium standard atomic clock.As the test body falls, optical interference fringes are generated by the laser interferometer.These fringes are counted and timed with the atomic clock.The measurements of time and distance are then fitted to a parabolic trajectory that produces an accurate measure of the gravitational acceleration.The A10 provides measurements without the need for post-processing, and so reduces any additional overhead required to run the machine.
49Areas with Completed Surveys The GRAV-D program has already covered several areas since starting in 2007.Eastern Alaska.Gulf of Mexico (focusing primarily on Louisiana and areas struck by Hurricane Katrina).The Great Lakes Region.California Coastline.
55Wavelength Measurements Measurements close to the planet capture short-wavelength and low-magnitude features.Measurements by plane capture intermediate-wavelength and midrange-magnitude features.Measurements by the satellites “GOCE” and “GRACE” capture long-wavelength and high-magnitude features.The satellites measure in 250x250 km data points and because of this the Satellite data cannot help fix the surface data because many of the surface surveys are smaller than 200x200 km.
56GRAV – DEllipsoidal heights are more common and much easier to find using GPS technology.Cannot be used to model water flow.Orthometric heights are related to water flow and can be used in floodplain mapping.Sometimes referred to as “height above sea level”To find orthometric heights, a model of the geoid must be created using measurements of the acceleration of gravity near the earth’s surface.
57Coast and Geodetic Survey Act Public LawObjective is to provide a national coordinated spatial reference system.Will provide orientation, coordinated positions, and elevations at specific points for mapping, planning, and development.Extend the National Spatial Reference System into areas that are not currently covered to meet infrastructure needs.Removehttps://www.cfda.gov/?s=program&mode=form&tab=step1&id=40dbf9b68027de96a134c38f069efa3d
58EquipmentThe main pieces of technology in an equipment suite are a Gravimeter, Inertial Measurement Unit (IMU), and GPS Base stationA gravimeter is a device used to measure the vertical acceleration of gravity on the earth’s surface.The gravimeters run on the Turnkey Airborne Gravity System (TAGS).An IMU utilizes three accelerometers and three gyroscopes to measure the aircrafts current rotation and acceleration.A base station is a GPS receiver at a fixed location.It gives corrected position data for increased accuracy.Remove
59Project ConstraintsNGS only owns two equipment suites, so only two field teams may run at one time$2.4 million budget per year for all survey operations (including aircraft, fuel, pilots, and NOAA personnel travel costs)Must use an airport with contract fuel when working on a government aircraftA standard block is 400 km by 500 km, which is approximately a 100 flight hour surveyBlocks must overlap by km on the sides to make the survey data continuousRemove
60Project ConstraintsGenerally northern areas in the summer, southern areas in the winterAvoid Eastern seaboard (especially SE) during Hurricane seasonAvoid Tornado Alley in Spring and FallGo to Oregon/Washington area June-AugustGo to Western Alaska June - SeptemberRemove
67Process Chart Process Controllable Tensions (affects air crews, contractors, and NOAA’s projected time for completion)TransitnoTime variability affects total completion time for surveyPrepSurveyyesData collection time restraints and accuracy of measurementsBreak-down DelaysUnplanned time delayWeather DelaysUnplanned time delay, seasonal awareness can aid delay severityEquipment RemovalLow time variability calls for no variability reduction analysis
68Planning ProcedureMap out the survey blocks across all the required regionsSelect airports that maximize area coverage and meet the necessary constraintsAssign survey blocks to each aircraft for a specific yearCalculate the total cost by adding all the variablesFuel cost, hangar cost, hourly wages, hotel / meal cost, travel costCalculate cost risk for design comparison
69Need Statement (old)NOAA needs to complete the 8% annual quota but receives limited funding from the Department of Commerce. Making the gravity survey more efficient will remove the tension with the Department of Commerce on NOAA’s need for more budget.Each Airplane Contractor needs to have their planes used evenly and fairly. The plan that is created needs to not rule out certain aircraft based on its constraints to minimize tension between each Airplane Contractor.NOAA needs the physical gravity datum but the pilots and support crews have a limited amount of time that they can work. NOAA needs to hire more pilots and/or implement a more efficient use of the pilot’s hours to maximize time in the air for gravity surveys.NOAA tries to prioritize each state based on State Government requests.NOAA needs to be willing to deviate from their set flight plans if in return a State Government can help fund the gravity survey.
70Problem Statement (old) NOAA needs to complete 8% coverage of Continental U.S., Alaska, Hawaii, Puerto Rico, U.S. Virgin Islands, Guam, and American Samoa per year. Since 2008 NOAA has not reached their annual goal and have only covered around 5-6% per year of the U.S. and territories. A plan to reduce variability within NOAA's budget is needed to reach their 8% per year quota so they can complete the GRAV-D project by the Fiscal Year 2022.
81Design AlternativesAllocate current resources which would reduce the variance in major points of the project.Currently, NOAA operates with six aircraft, 4 teams, and two equipment packages.Determine major factors in reducing variability (backup aircraft or equipment maintenance).Add additional resources.To reduce variability add additional aircraft, equipment suites, or personnel.
82Design Alternatives Allocate current resources (focus on performance). Currently, NOAA operates with six aircraft, 4 teams, and two equipment suites.Determine major factors in reducing variability (backup aircraft or equipment maintenance).Add additional resources (focus on availability).To reduce variability add additional aircraft, equipment suites, or personnel.Add additional contract aircraft to increase aircraft availability.Additional resources and allocation (combination)
83Design AlternativesThe second alternative would be to add additional resources such as aircraft, equipment suites, or personnel as well as allocating them in an optimal manner.By having limited resources, NOAA is severely deterred in the number of surveys they can complete during a fiscal year. Additional assets will cost more money, but will speed up the process by allowing multiple surveys to be done at the same time and may be more beneficial in the long run of the project.
84Sensitivity AnalysisIdentify Parameter with biggest impact on time and cost.Identify the percent change in a parameter to…
85Preliminary Recommendations Our simulation is similar to the real thing
114Works CitedGRAV-D Science Team (2011). "Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Project, Airborne Gravity Data; Block AS01". Available 09/28/2012. Online at:GRAV-D Science Team (2011). "Block AS01 (Central South 01); GRAV-D Airborne Gravity Data User Manual." Theresa Diehl, ed. Version 1. Available 09/28/2012. Online at:GRAV-D Science Team (2011). "GRAV-D General Airborne Gravity Data User Manual." Theresa Diehl, ed. Version 1. Available 09/28/2012. Online at:LaCoste , Micro-g . "A-10 Gravimeter User’s Manual." A-10 Outdoor Absolute Gravimeter. Micro-g LaCoste, July Web. 10 Oct <http://www.microglacoste.com/pdf/A-10Manual.pdf>."IEEE-USA Consultants Fee Survey Report." Exality.com. IEEE-USA E-Books, Web. 14 Oct <http://www.exality.com/files/ConsultantFeeSurvey2011.pdf>.Special thanks to the project managers at NOAA for providing much of the information needed for the context and constraints.
115Assist Tool PreviewThis thing seems problematic. I think we get rid of it from the presentation and work on it on the side. They seem really confused by this and seem to think we are using it to make our recommendations with it.