Presentation on theme: "State of Indiana Orthophotography and LiDAR Program"— Presentation transcript:
1 State of Indiana Orthophotography and LiDAR Program R.N. WilkinsonSpecial thanks to:Jim SparksJim StoutPhil Worrall
2 Indiana’s Statewide GIS Framework Data Layers At the edge of some great accomplishments
3 Statewide GIS Initiatives IndianaMap Data Sharing InitiativeBroadband Mapping ProgramLocal-Resolution NHD DevelopmentOrthophotography & LiDAR ProgramIGIC/ISPLS Height Modernization Pilot & the INDOT CORS NetworkThe New IndianaMap Viewer R3If you look at Indiana’s large project compared to other states – for a number of these, Indiana is often in the lead pack for these types of initiatives!For example, our 2005 IndianaMap Statewide Orthophotography project was the first in the Nation to require a 100% digital camera solution. Now this requirement is commonplace.Indiana’s new Statewide geospatial data program continues to lead the way, by incorporating the collection of both new digital imagery and digital elevation data into the same program.Our Statewide Local-resolution NHD project is also one of the first such statewide projects in the Nation!
4 2011 -2013 Statewide Ortho – LiDAR Deliverable Products Ortho Data Products (Delivered by County)1-foot Pixel 4-band GeoTIFF tiles (NSSDA)ECW Compressed Tiles (~20:1)FGDC MetadataElevation Data Products (Delivered by County)LAS 1.2 Classified Point Cloud, 1.5 meter NPS (nominal point spacing, Bare Earth, first & last return data, and intensity (NSSDA & USGS Ver. 12/13)Bare-Earth Hydro-Flattened DEM (IMG format 5-foot pixel tiles)Hydro Breaklines in ESRI format
5 LiDAR & LAS Files Light Detection and Ranging (LiDAR) LAS file: An ASPRS open format to store LIDAR point data records. LAS files combine GPS, IMU, and laser pulse range data to produce X, Y, and Z point data.LAS was designed as a data exchange format between different systems and software more than anything else (.img, .tif, .grd, .xyz, .tin)LAS files are becoming in greater demand because of the richness of the data they contain, and the growing ability to easily process the point cloud data on demand to create the exact product and data format users need.
6 Program History 2005 Statewide Imagery Project DHS Grant was stimulus Program the result of the IGIC Orthophoto WorkgroupPrimary goal was a one-year statewide acquisition$8.5 Million costCompleted in 2006
7 2005 Ortho Project Benefits $1.7 Billion worth of project and operations support
9 Deliverables - Orthophotography LiDAR ECW files GeoTiff Metadata Compressed filesGeoTiffLocated geographicallyMetadataTile Index5000 x 5000 indexLiDARDigital Elevation ModelsDEMsLAS filesHydro Line WorkUsed to hydro flatten water bodiesTile Index5000 x 5000 index
10 2011 Indiana Statewide Program Administered through Indiana Office of Technology – State Geographic Information Officer – Jim SparksBase Products1’ Pixel Resolution – 4-Band ImageryUSGS-compliant, 1.5 meter post spacing LiDARDigital Elevation ModelAvailable Buy-up Options6”-inch Resolution Ortho3”-inch Resolution Ortho1-meter post spacing LiDAR
11 What is an Orthophotograph? Definition:A digital (electronic) aerial photograph that has been modified to remove distortion from the camera & airplane and adjusted to fit the ground surface.It is a photo that can be used as a MAP.
16 Orthophoto UsesOrthophotography has the geometric characteristics of a map and the image qualities of a photograph.distance measurementsarea calculationsdetermination of feature shapedirection calculationsdetermination of coordinates at a locationanalyze change
21 Indiana LiDAR Program Capture 1/3 of state/year Base LiDAR product is: LiDAR Point Cloud 1.5 Meter Post Spacing 1st & Last & Intensity (LAS v12 format)Digital Elevation Model 5-foot pixel, 5k-foot tiles, hydro-flattened (ERDAS Imagine IMG format)Buy-up:1-meter LiDARContours
22 Statewide LiDAR Data Sources Blue counties (new LiDAR capture planned)Other Counties (recent County LiDAR projects)Other Areas (recent FEMA LiDAR projects )All data homogenized into statewide data product / delivery standard
23 Indiana LiDAR Program Objective New LiDAR data – with many benefits beyond standard DEM and DTM production, especially when combined with 4-band imagery:Automatic Feature ExtractionChange DetectionImpervious Surface AnalysisLand Use/Land Cover ExtractionForestry AnalysisFlood AnalysisLine of Site Analysis
24 LiDARLight Detection and Ranging – laser range finding from an airplane or helicopter.Builds a “cloud” of X,Y,Z points reflected back to the receiver.Captures all reflective surfaces (ground, buildings, trees, utility lines). Not water.Reflectivity can be used to determine type of surface.
26 LiDAR shaded blue to red, oblique view LiDAR shaded blue to red, oblique view. Arrow shows perspective of next slide.
27 LiDAR of tree stand, oblique view LiDAR of tree stand, oblique view. Note Cyan dots represent points on the ground. So, about 1/1000 points get to the ground through dense forest.
28 Definition – Digital Elevation Model A 3D computerized representation of the variation of relief of the earth’s surface in the form of points of elevation (often supplemented by breaklines depicting severe changes in slope).Used for: - Rectifying aerial photography. - Calculating ground contours. - 3D modeling of slope and drainage.
32 LiDAR shaded red to blue elevations. Trees are easily identifiable.
33 Depth GridsDepth of flooding derived from subtracting WSEL and terrain gridsTo be a standard deliverable for FEMA Flood Insurance Study modeling under RiskMAPAlso a standard input for HAZUS-MH to determine flood loss impacts
38 Access to Data IU Indiana Spatial Data Portal Indiana Map Single file downloadMulti-file download toolIndiana MapState of IndianaCounty GovernmentsOpen Topography websiteIGIC Corporate or Institutional MembersHard drives available through Phil Worrall
49 Open Topography Server Classes of data types available LiDAR point cloud dataStandard digital elevation models (DEMs)For LiDAR point cloud data, web-based tools are also available to process these data into custom DEMs.