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Ortho & LiDAR. Accuracy Assessment. Mike Tully President & CEO, Aerial Services, Inc. Cedar Falls, Iowa. FAIL. George Washington Bridge, NY. FAIL. FAIL. FAIL. Now What? . Take Away: Why you should care about positional accuracy !. “Intended Use”. What do you mean by

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Presentation Transcript
ortho lidar

Ortho & LiDAR

Accuracy Assessment

Mike Tully

President & CEO, Aerial Services, Inc.

Cedar Falls, Iowa

slide7

Take Away:

Why you should care

about positional accuracy!

slide10

What do you mean by

“accuracy”?

Accuracy

Consistency

Others

Precision

Completeness

Currency

accuracy defined

Accuracy Defined

Simple & Sweet

how tall are you
How Tall Are You?

“Measurement Error

is InEscapable

measuring error
Measuring Error

Surveyed XYZ

∆R

∆Y

Image XYZ

∆X

probability confidence
Probability & Confidence

±2 SD

95%

±1 SD

68%

Mean

Below Mean

Above Mean

nmas 2 contours to nssda standards
NMAS 2’ Contours to NSSDA Standards

Mean

NMAS 2’ Contours requires ½ Contour Interval = 1.0’ Accuracy.

NSSDA with 95% Confidence requires 1 RMSE of 0.61’

2 SD

Frequency

95% Confidence

Observed

Error in Z

Actual Data

non normal
Non-”Normal”

Skewed

“Peakedness”

“Normal”

changing technology evolving standards
Changing Technology … Evolving Standards

Orthos (GSD)

Lidar (points/sq m)

next gen standards
Next-Gen Standards

ASPRS [Draft] Accuracy Standards for Digital Geospatial Data, 2012

Includes a new high accuracy level “X”

Class IIA = USGS minimum vertical accuracy (unclassified lidar)

assessing accuracy

Assessing Accuracy

Ortho & Lidar

advanced visual metrics
Advanced Visual Metrics

Visual inspection of hydro-flattening seems to be

predominant quality metric. There are BETTER ways!

error reporting lidar orthos
Error Reporting: Lidar & Orthos

SIS Topo Analyst™

Co-Registered LiDAR and Ortho accuracies are reported.

lidar accuracy metrics
LiDAR Accuracy Metrics

COVERAGE

OVERLAPS

lidar accuracy metrics1
LiDAR Accuracy Metrics

Point Density Plots

Water Voids / Holes

lidar accuracy metrics2
LiDAR Accuracy Metrics

Relative Accuracy (RMSD)

Z-diff Rasters

lidar accuracy
LiDAR Accuracy

Control Point Errors

Metadata

Errors

Classification Errors

Error Distribution

Rigorous Statistics

Automated QA / Verification