Presentation on theme: "State of Indiana Orthophotography and LiDAR Program R.N. Wilkinson Special thanks to: Jim Sparks Jim Stout Phil Worrall."— Presentation transcript:
State of Indiana Orthophotography and LiDAR Program R.N. Wilkinson Special thanks to: Jim Sparks Jim Stout Phil Worrall
Indianas Statewide GIS Framework Data Layers At the edge of some great accomplishments
IndianaMap Data Sharing Initiative Broadband Mapping Program Local-Resolution NHD Development Orthophotography & LiDAR Program IGIC/ISPLS Height Modernization Pilot & the INDOT CORS Network The New IndianaMap Viewer R3 Statewide GIS Initiatives
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 Metadata Elevation Data Products (Delivered by County) Elevation 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 – FGDC Metadata
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.
Program History 2005 Statewide Imagery Project – DHS Grant was stimulus – Program the result of the IGIC Orthophoto Workgroup – Primary goal was a one-year statewide acquisition – $8.5 Million cost – Completed in 2006
$1.7 Billion worth of project and operations support 2005 Ortho Project Benefits
Deliverables - Orthophotography – ECW files Compressed files – GeoTiff Located geographically – Metadata – Tile Index 5000 x 5000 index LiDAR – Digital Elevation Models DEMs – LAS files – Hydro Line Work Used to hydro flatten water bodies – Tile Index 5000 x 5000 index
2011 Indiana Statewide Program Administered through Indiana Office of Technology – State Geographic Information Officer – Jim Sparks Base Products 1 Pixel Resolution – 4-Band Imagery USGS-compliant, 1.5 meter post spacing LiDAR Digital Elevation Model Available Buy-up Options 6-inch Resolution Ortho 3-inch Resolution Ortho 1-meter post spacing LiDAR
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. What is an Orthophotograph?
2002 Orthos with 2002 Orthos with old DEM 2003 Orthos with 2003 Orthos with new DEM
Orthophotography has the geometric characteristics of a map and the image qualities of a photograph. distance measurements distance measurements area calculations area calculations determination of feature shape determination of feature shape direction calculations direction calculations determination of coordinates at a location determination of coordinates at a location analyze change analyze change Orthophoto Uses
Indiana LiDAR Program Capture 1/3 of state/year Base LiDAR product is: –LiDAR Point Cloud 1.5 Meter Post Spacing 1 st & Last & Intensity (LAS v12 format) –Digital Elevation Model 5-foot pixel, 5k-foot tiles, hydro-flattened (ERDAS Imagine IMG format) Buy-up: –1-meter LiDAR –Contours
Statewide LiDAR Data Sources Blue counties (new 2011 -2013 LiDAR capture planned) Other Counties (recent County LiDAR projects) Other Areas (recent FEMA LiDAR projects ) All data homogenized into statewide data product / delivery standard
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 Extraction – Change Detection – Impervious Surface Analysis – Land Use/Land Cover Extraction – Forestry Analysis – Flood Analysis – Line of Site Analysis
LiDAR Light 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.
LiDAR shaded blue to red, oblique view. Arrow shows perspective of next slide.
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.
Definition – Digital Elevation Model A 3D computerized representation of the variation of relief of the earths 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.
LiDAR shaded red to blue elevations. Trees are easily identifiable.
Depth Grids Depth of flooding derived from subtracting WSEL and terrain grids To be a standard deliverable for FEMA Flood Insurance Study modeling under RiskMAP Also a standard input for HAZUS-MH to determine flood loss impacts
Access to Data IU Indiana Spatial Data Portal – Single file download – Multi-file download tool Indiana Map State of Indiana County Governments Open Topography website IGIC Corporate or Institutional Members – Hard drives available through Phil Worrall
Open Topography Server Classes of data types available LiDAR point cloud data Standard digital elevation models (DEMs) For LiDAR point cloud data, web-based tools are also available to process these data into custom DEMs.