LiDAR & Oblique Solutions Sanchit Agarwal, CP, CMS, GISP … · 2016-02-26 · 1 . LiDAR & Oblique...
Transcript of LiDAR & Oblique Solutions Sanchit Agarwal, CP, CMS, GISP … · 2016-02-26 · 1 . LiDAR & Oblique...
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LiDAR & Oblique Solutions Sanchit Agarwal, CP, CMS, GISP Director of Mapping Operations, Sanborn
“Sanborn” and “Sanborn Map” are Trademarks owned by The Sanborn Library, LLC and used under license by The Sanborn Map Company, Inc.
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Overview • Summary of 2015 Michigan State LiDAR Program
• LiDAR Quality Levels
• Calibration and Accuracy Reporting
• LiDAR Products – Classified LAS
– DSM/DTM
• Hydro-flattenning
– Intensity Images
– Building Footprints
10/10/2014 ©2013, The Sanborn Map Company, Inc. 2
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Summary of 2015 Michigan LiDAR program
10/10/2014 ©2013, The Sanborn Map Company, Inc. 3
All the work will be carried out according to the USGS LiDAR Base Specifications Version 1.0 & the FEMA Guidelines
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DEM Quality Levels
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LiDAR Point Density
0.35m NPS (QL-1) 0.7m NPS (QL-2) 1.4 m NPS (QL-3)
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QL3 1.4 NPS Flight Plan
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QL2 0.7 NPS Flight Plan
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1st (and only)
return from
ground 3rd return from
ground
1st return from
tree top
2nd return from
branches
Provided by Leica Geosystems GIS and Mapping, LLC
Multiple Return Capability
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TIN of First Return Lidar Data
Advantages of the Multiple Return Capability
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Last Return Data Processed to Bare Ground
Advantages of the Multiple Return Capability
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LiDAR Calibration Overview • GPS-IMU Processing
• Installation Calibration
• Compute mission calibration parameters using calibration lines
• Final LiDAR Calibration Using TerraMatch
• DZ Ortho process: for relative accuracy
• Control-Point Z Adjustment
• Run FVA, SVA and CVA reports to independently validate and report the accuracy (After Manual Classification and QC).
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LiDAR Calibration
Flightline Width
Vertical Separation
Roll Correction = atan(Vertical Separation/Flightline Width)
Flight Direction
Flight Direction
Cross-Section
Location
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Horiz. Shift
Pitch Correction = atan((Horiz Shift/2)/Flying Height)
LiDAR Calibration
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LiDAR Calibration
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Bare-Earth & Low Grass
Wooded/Forest
Weeds/Crops
Scrub/Shrub
Urban/Built-up
USGS QA/QC for Lidar
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New Upcoming Specs • Accuracy specifications for all Geospatial products including LiDAR will be
defined by the new ASPRS Specs ASPRS_Accuracy_Standards_for_Digital_Geospatial_Data
• Instead of the FVA and SVA, there will be new terminologies about accuracy assessment in NVA (Non Vegetated areas) and VA (Vegetated Areas) and there accuracies will be called NVVA and VVA
• There are some changes in the LAS Version requirements but software are not ready for that yet.
• There will be a requirement to report horizontal accuracy for LiDAR datasets
• USGS/Dewberry is working on a methodology to report relative accuracy between swaths. That might be a part of the new requirement.
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Typical LiDAR Products
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Hydro-Flattening
– The USGS Hydro-flattening/Hydro-Enforcement Specs are
– Water bodies bigger than 2 Acres are flat
– River wider than 100 ft are flat bank-to-bank and follow downhill gradient
Lidar only Hydro-flattened Lidar
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Hydro-Flattening Examples
Lidar only
Hydro-flattened Lidar
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Hydro Enforced Breaklines
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Contouring
• Breaklines required to support accuracy (base)
• Additional Breaklines; ‘Planimetric Style’ – All hydrography lines
– Bridges, buildings
– Road and parking lot edges rail centerlines “hard” and “soft” breaklines
• Sanborn works closely with customer to determine degree of smoothing
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Automated Building Extraction: Example 1
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Automated Building Extraction: Example 2
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Automated Building Extraction
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Automated Building Extraction
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Sanborn
Oblique Imagery Solution
“Sanborn” and “Sanborn Map” are Trademarks owned by The Sanborn Library, LLC and used under license by The Sanborn Map Company, Inc.
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What is Sanborn Oblique Imagery?
Camera
1
Camera
2 Camera
3 Camera
4
Camera
5
The Sanborn Oblique Imagery Solution enables users to see multiple aerial views of any location while providing access to the Oblique Analyst (a browser-based tool) & an Application that runs on ESRI platform that allows users to extract measurements and derive important information from oblique imagery views.
Sanborn has collected, processed and staged more than 20K sq miles (~15 million oblique images) in last 3 years.
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Sensors
Sanborn owns and operates 4 Oblique Camera Systems
In Oblique sensors we use calibrated lenses, photogrammetric camera mounts, and full Aerial Triangulation for generating mapping level accuracies.
In the production workflow Sanborn computes refined exterior and interior orientation parameters using an integrated Nadir and Oblique Bundle block adjustment
Rotation Tube
Optional Applanix IMU
Manual Leveling
Aircraft Floor Plate
Camera Holding Bracket
Camera
Safety Retainer
Clamp
Drift Motor
Mount Assembly
Pneumatic Suspension
Video Camera Mount
Quick Disconnect Flange
A Typical Multi-Camera Oblique Digital Acquisition System
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Sanborn | Oblique Imagery Solution
Final, georeferenced imagery is delivered to the end-user in a format that makes it easy to see, analyze, and extract data from effectively.
Sample: 6-inch Oblique Colorado Springs, CO Acquired: 2008
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Sanborn Oblique AnalystTM
The Oblique Analyst viewer is equipped with tools designed to easily derive information from oblique imagery. In addition, with one click, all annotations, measurements, and drawings in the window can be easily output to PDF for distribution.
Tool Bar
Users can verify information such as location / coordinates / search by address , while having access to tools that allow for direct measurement of height, area, length, etc.
Locations Panel
Interactive panel which simultaneously shows -- and provides instant access to -- all five views of a location. Users also can change the current window view using the rotary tool at the bottom of the window.
Google Map
This panel displays the current location view overlaid on a Google map, providing helpful spatial context for the user.
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Oblique Analyst Functionality
Measure Area Measure the surface area of an object in the imagery.
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Oblique Analyst Functionality
Measure Height A featured tool is provided to measure an object’s height in the image.
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Measure Length A tool is provided to measure length along the side of an object in the image.
Oblique Analyst Functionality
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Show Coordinates
Oblique Analyst Functionality
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Drawing and Text Annotation Create points, lines, polygons, or input text on the image. Create a PDF from the image for easy distribution. Output includes measurements, drawings, and annotations.
Oblique Analyst Functionality
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8-inch Resolution
Sanborn | Oblique Imagery Solution
Dallas, Texas
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3.7-inch Resolution
Sanborn | Oblique Imagery Solution
Dallas, Texas
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2.5-inch Resolution
Sanborn | Oblique Imagery Solution
Dallas, Texas
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Moore, Oklahoma - 2012
Before and After Comparison
Sanborn | Oblique Imagery Solution
Moore, Oklahoma - Tornado Destruction – 2013 On May 20, 2013, an F5 tornado devastated a swath of the Oklahoma City suburb. The storm destroyed homes, businesses and severely damaged a hospital and two elementary schools, leaving a trail of destruction in some spots that was as much as 1.3 miles wide and 17 miles long. This imagery depicts the before and after for an isolated area.
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3D Mesh Model
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High-resolution, textured, 3D mesh model made from 2D oblique images.
End product is a true-3D (as opposed to 2.5D height maps), high-resolution, and photo-textured model