Everybody Produces Quality Products
Quality is:
1. Measure of excellence
2. Free from Defects
3. Fitness for Use
4. Customer Satisfaction
5. Compliance with Specifications
6. ISO 9000 “the totality of features and characteristics of a product or service that bears it ability to satisfy stated or implied needs”
Quality Assurance (QA) is a plan or process designed to ensure that development of a product or service will meet its objectives (Prevent Defects)
Quality Control (QC) is a set of activities designed to evaluate, or test, the final product or service. (Identify Defects)
Quality Review is independent review of a QA and QC process.
Types of Quality Control
100% Sampling
Random Sampling
QR Process
Metadata
Vertical Accuracy
Horizontal Accuracy
Classifications
Automated Checks
File Naming and
Correct Geographic Coverage
Project Coverage
Point Density
All Points
Ground Points
Data Voids
Duplicate Points
Data Consistency
Relative Accuracy
Absolute Accuracy
LAS Version
Projections and Coordinate System
Tile Size
Correct Point Records
GPS Time Stamps
X,Y,Z Coordinates
Intensity
Return Number
Flight Source I
Manual Checks
Seam Lines
Corn Rows
Classifications
90% artifacts
95% Outliers
95% Vegetation
98% Buildings
Bridges?
Intensity Returns
Break Lines
Hydro Enforcem
Vertical Accuracy
Root Mean Square Error (RMSE)
RMSE = Sqrt ( Σ ( Z – Zi )2 ÷ N)
1 RMSE = 68% of the Area Under a Normal Distribution Curve
1.96 x RMSE = 95% of the Area Under the Normal Distribution Curve
281-750-6709
21417 Lambeth Ridge Lane Kingwood, Texas 77339
