Florida Division of Emergency Management …...2010 Southeast Regional User Group Conference -- User Presentation, SERUG, Florida Division of Emergency Management Statewide Coastal

Florida Division of Emergency Management Statewide Coastal LiDAR

Overview and QA lessons learned

Bill Millinor

April 26, 2010

Presentation Overview

Project Overview– Governors’ Initiative (HB 7121)

Baseline Specifications & Statewide Coordination Existing LiDAR Inventory QA WorkflowCommon QA IssuesQA Lessons Learned QA ToolsBrief Terrain DiscussionQuestions

Jones Edmundswww.floridadisaster.org/gis/lidar

FDEM Project Scope

Terrestrial LiDAR ($22 million)

Update Storm Surge Models ($2

million)

Update 11 Regional Evacuation

Studies ($4 million)

FDEM Project Roles

Program Management: FDEM & Jones EdmundsPrime Contractors:– Woolpert– Merrick– CH2MHill (3001)– Program Data Solutions

(Dewberry, PBS&J, URS)

http://www.floridadisaster.org/

Project Management Responsibilities

Create Statewide baseline specifications

~15,000 sq. miles of new LiDAR mapping

Data management

Quality assurance

Manage Expectations – issues of scale, statewide

vs. watershed

Enforce consistency throughout the project areahttp://www.floridadisaster.org/gis/lidar/

Baseline Specifications LiDAR and Orthophotography

Intended to provide a dataset for use by the broadest number of stakeholders. LiDAR Specifications based on:– Input from stakeholders ranging from the

WMDs, FDEP, ACOE, Universities and private sector

– SWFWMD LiDAR and Orthophotography Specifications

– FEMA Appendix A– FGDC Geospatial Positioning Accuracy

Standards– National Standard for Spatial Data Accuracy

(NSSDA)– ASPRS Guidelines: Vertical Accuracy Reporting

for Lidar Data– LAS Specifications 1.1

http://www.floridadisaster.org/gis/lidar/


Orthophotography1 foot pixel orthorectified imagesGeoTiff and sid deliverables3.8 foot horizontal accuracy Florida State Plane, US Feet, NAD83/HARN

LiDAR4 foot post spacing0.6 foot fundamental vertical accuracy (FEMA requires 1.2’)3.8 foot horizontal accuracyFlorida State Plane, US Feet, NAD83/HARN and Geographic NAD83/HARN, NAVD88 feetHydrologically correct breaklinesOne and two foot contoursLAS 1.1 classified into Classes 1, 2, 7, 9, and 12

– Unclassified, Ground, Noise, Water, Overlap

http://www.floridadisaster.org/gis/lidar/


LiDAR Deliverables:LAS format, not ASCII– Full point cloud

Geodatabase for contours and breaklinesAllows data to be easily used to create an ESRI terrain

Simple feature classCOASTALSHORELINE Contains Z values

Contains M valuesGeometry Polygon

NoYes

Data typeField namePrec-ision Scale LengthDomainDefault value

Allow nulls

OBJECTID Object ID Shape Geometry Yes

DATESTAMP_DT Date Yes 0 0 8Shape_Length Double Yes 0 0 Shape_Area Double Yes 0 0

Simple feature classCONTOUR Contains Z values

Contains M valuesGeometry Polyline

NoNo

Data typeField namePrec-ision Scale LengthDomainDefault value

Allow nulls

OBJECTID Object ID Shape Geometry Yes

CONTOUR_ELEVATION_MS Double Yes 0 0 CARRYING_CONTOUR_ELEVATION_MS Double Yes 0 0

CONTOUR_TYPE_DESC String Yes dCONTOURTYPE 50DATESTAMP_DT Date Yes 0 0 8

Shape_Length Double Yes 0 0

Existing LiDAR Inventory

Inventoried existing LiDAR data, compiling:– Project Footprint– Scope of Work or

Specifications– Accuracy Assessment

Evaluated compatibility of LiDAR w/ Baseline SpecificationsData deemed compatible was not reflown as part of our LiDAR mapping efforts

QA Workflow Overview

Review geodatabase schemaCheck topologyRun LAS Statistics (MARS)Create a 20-ft DEM from Class 2 pointsRun vertical accuracy testsCheck LAS Header InformationReview MetadataComplete overview of LAS and breaklines Detail review of 10% of tilesReview QA Calls from previous deliverableCheck edge matching between adjacent deliverablesReview LiDAR Processing ReportsHydro feature 3D checks

QA WorkflowReview geodatabase schema– Created a custom

Schema Validation tool for the FDEM project

Class1 Rule Class2 ErrorsCONTOUR_1FT Must Not Intersect 0

CONTOUR_1FT Must Not Self-Overlap 0

CONTOUR_1FT Must Not Self-Intersect 0

CONTOUR_2FT Must Not Intersect 0

CONTOUR_2FT Must Not Self-Overlap 0

CONTOUR_2FT Must Not Self-Intersect 0

HYDROGRAPHICFEATURE Must Not Self-Overlap 0

HYDROGRAPHICFEATURE Must Not Self-Intersect 0

OVERPASS Must Not Intersect 0

OVERPASS Must Not Self-Overlap 0

OVERPASS Must Not Self-Intersect 0

ROADBREAKLINE Must Not Intersect 0

ROADBREAKLINE Must Not Self-Overlap 0

ROADBREAKLINE Must Not Self-Intersect 0

SOFTFEATURE Must Not Intersect 0

SOFTFEATURE Must Not Overlap With ROADBREAKLINE 0

SOFTFEATURE Must Not Overlap With HYDROGRAPHICFEATURE 0

SOFTFEATURE Must Not Self-Overlap 0

SOFTFEATURE Must Not Self-Intersect 0

Check topology

QA WorkflowCustom LAS Statistics Tool (Merrick)

Create a 20-ft DEM from Class 2 points (look for striping and anomalies)

QA Workflow

Vertical accuracy tests against LiDAR TIN (via MARS)FVA < 0.6’

QA Workflow

Check LAS Header Information Review Metadata

Common Deliverable Issues

Missing hydrographic features

Failing vertical accuracy test (0.60 required)

Deliverable FVA Value

Levy d1 0.67

Jefferson d1 0.62

Dixie d1 0.74

Dixie d2 0.69

Bay d1 0.74

Nassau d1 1.51

Taylor d1 0.73


Errors in LAS Statistics– LAS Files have classes that do not meet specs

– Out of range Z values

Breakline Comparisons

Delivery Soft features Hydrographic Features # Tiles

# Linear Miles

# per tile

Linear Mile/Tile

# Linear Miles

# per tile

Linear Mile/Til

e

Gulf 1,345 255 1.86 0.35 3,559 1,055 4.9 1.45 725

Franklin 2,172 401 2.76 0.59 2,942 885 3.73 1.12 788

Herbert Hoover Dike

23,013 494 70.2 1.6 86,181 3,074 263 9.4 328

Broward 7,968 559 14.25 1.06 2,687 1,455 527 2.76 527

Sarasota 217,306 12,484 379 21.7 92,003 4,316 160 7.5 574

18

Enforcing consistency from different contractors and subcontractors

Common Deliverable IssuesBreakline Comparison

Deliverable from Contractor A83 Linear Hydrographic Features

Deliverable from Contractor B340 Linear Hydrographic Features

Common Deliverable IssuesBreakline Comparison

Deliverable from Contractor A0 Soft features

Deliverable from Contractor B1,334 Soft features


Flight line calibration - DEM


Flight line calibration – overlapping LAS flight lines


High intensity return values resulting in dips in elevation of 1.2 feet on bare earth masspoints

Breaklines and Hydro-Enforcement

Hydro-enforced breaklines critical to accurate representation of heavily vegetated channels

Minimizes subsequent ground survey x-sections for modeling

Better more-accurate floodplains


2-D Draped Soft-hydro features with undulation in elevation values

Flow

Flow


Lessons learned

More guidance examples in SpecificationsReceive pilot datasets earlyEnsure contractor follows pilotDocument everythingDifficult to enforce consistency across multiple primes with multiple subsProvide a good sample dataset if possiblePlan for schedule slipping…

Tools Used in the FDEM Project

Plan to use multiple tools to review the data– ESRI’s ArcInfo – breakline review and terrain and

DEM generation– LP360 – viewing LAS within ArcMap– MARS – native LAS software suite– Lastools – command line LAS software, reads

header http://www.cs.unc.edu/~isenburg/lastools/– PointView – standalone LAS viewer, reads header– GlobalMapper – fast LAS and DEM viewer– MP (USGS) – metadata parser

Project Updates and What’s Next?

FDEM Website and Interactive Project Viewer – includes list of sites to download the data– http://www.floridadisaster.org/gis/LiDAR/– http://map.floridadisaster.org/lidar/

Ongoing Distribution to Partner AgenciesOngoing DEM uploads to USGS NEDFuture LiDAR data collection funding?

Data Access

Florida International University's International Hurricane Research Center - http://mapping.ihrc.fiu.edu/fldemlidarNOAA's Digital Coast - http://csc-s-maps-q.csc.noaa.gov/dataviewer/viewer.html?keyword=lidarUSGS Center for LiDAR Information Coordination and Knowledge (CLICK) - http://lidar.cr.usgs.gov/USGS National Map Seamless Server - DEMs http://seamless.usgs.gov/website/seamless/viewer.htmSouth Florida Water Management District GISUniversity of Florida's Florida Geographic Data Library http://www.fgdl.org/

Terrain Discussion

Data Sources– Surface Feature

Types

Pyramid Type– Window Size is faster– Bugs to be corrected in

9.3.1 sp2

Terrain Discussion

Terrains have scaled well Terrain to Raster– Minimize memory usage

for large terrains

Questions

Bill Millinor, [email protected]

352-377-5821

Documents

Florida Division of Emergency Management …...2010 Southeast Regional User Group Conference -- User Presentation, SERUG, Florida Division of Emergency Management Statewide Coastal