Table of Contents
Using CORS Workshop (Continuously Operating Reference Stations)
CORS Information
Global Positioning System GPS
GPS Satellite
GPS Receivers
Standalone Positioning: Since May 1, 2000
Pseudorange From Code Data
Standalone Positioning: By 2011
GPS Error Sources
Atmospheric Delays
Signal Multipath
Differential GPS Positioning
Real Time Kinematic: Today
Real Time Kinematic: Tomorrow
National CORS Accuracy
Continuously Operating Reference Stations
Regional CORS Coverage
Local CORS Coverage
CORS Sites
CORS Overview
CORS Overview-Continued
Cooperative CORS
National CORS & Cooperative CORS
CORS Sites near Houston, TX
National CORS Partners
CORS Partners: Federal
CORS Partners: States
CORS Partners: Scientific
CORS Partners: International
Civil GPS Use
Consumer/Recreational
Future GPS Users
Higer Accuracy Examples
Timing Applications
CORS Applications
Height Modernization
Geographic Information Systems (GIS)
LIDAR images of Manhattan before and after 11 SEP 2001
DGPS & NDGPS Coverage
Sites With "MET" Sensors
Monitoring Precipitable Water Vapor
Mapping Total Electron Content (TEC)
Monitoring Crustal Motion
Knowing Where You Are!
National Spatial Reference System
A geodetic reference framework forms the spatial foundation for the creation of any Land-Information System (LIS).”
National Spatial Reference System
Improving Positional Accuracy
High Accuracy Reference Networks
NAD 83 Readjustment
NAD 83 Readjustment
CORS Advantages
CORS Data Quality
CORS Disadvantages
CORS Density and Position Redundancy
Non-Differential GPS (Autonomous or Stand-alone)
Differential GPS
Real-Time Differential GPS
Variations on GPS Positioning
Continuously Operating Reference Stations
Three Tests for Positioning Precision
Test Design: dual-frequency carrier phase
Baselines Used In Accuracy Tests
RMS versus Distance
RMS versus Time Carrier-Phase (North)
RMS versus Time Carrier-Phase (East)
RMS versus Time Carrier-Phase (Up)
Positioning Accuracy Using CORS
National CORS Accuracy
Multiple Sessions (North) twice the rms (cm)
Multiple Sessions (East) twice the rms (cm)
Comments
Test Design: Single-Frequency Code
Precision Relative to Baseline Length GPS Code (North)
Precision Relative to Baseline Length Code (East)
Multiple Sessions (North) twice the rms (m)
Multiple Sessions (East) twice the rms (m)
Comments
Maritime/Nationwide DGPS
Overall Summary
Surveying Applications Using CORS
Surveying Applications Using CORS
Surveying Applications Using CORS
Surveying Applications Using CORS
Accessing CORS Data & Metadata
CORS Web page
CORS Coverage
Sampling Rates
Detail Map
Metadata for a CORS Site
CORS Position & Velocity (NAD 83)
CORS Position & Velocity (ITRF)
CORS Data Availability and Profile
CORS Data Availability...con't
CORS Site Photo
Position Time Series (Long Term)
Position Time Series (Last 60 Days)
Station Log File
Station Log File, Con't
Station Log File, Con't
Station Log File, Con't
Primary Data FileS
GPS Data Files -- RINEX Format v2.10
How Does NGS Collect CORS Data?
RINEX File Naming Conventions
RINEX File Naming Conventions, Con't
Meteorological Data
NGS Satellite Emphemerides
Three ways to download CORS Information
CORS Home Page
UFCORS - Page 1
UFCORS - Page 2
UFCORS - Standard Download Page
Access To CORS ArchivE Via FTP
FTP
FTP Directory Structure
What is OPUS?
How does OPUS work?
How do I use OPUS?
OPUS Home Page
How is the antenna height measured?
Why do I need antenna type?
What does OPUS output look like?
How are OPUS positions computed?
How are OPUS errors estimated?
How would I get Help?
What are some OPUS guidelines?
GPS Antenna Phase Center Variation
GPS Antenna Phase Pattern Calibrations
Antenna Calibration Facility in Corbin, VA
Phase Center Variation
File Compression Format
Software / RINEX Utilities
Utility Examples
Utility Examples, Con't
Estimated Cost For CORS Equipment
Guidelines For Setting a CORS Monument
Guidelines for Constructing a CORS Antenna Mount
Guidelines for Constructing a CORS Antenna Mount - continued
Defining a ECEF Reference System
3-D ECEF Coordinates
North American Datum of 1983 (NAD 83)
North American Datum of 1983 (NAD 83) (continued)
World Geodetic System of 1984 (WGS 84)
Tracking Network Defining WGS 84
International Terrestrial Reference Frame (ITRF)
International Terrestrial Reference Frame (ITRF) - (continued)
Sites Defining ITRF96
ITRF Horizontal Velocities
Simplified Concept of ITRF 97 vs. NAD 83
Effect of Rotation About the Y-axis
Reference Frame Transformation
Transformation Parameters ITRF96 to NAD_83
Transforming Positions
GPS vs. Leveling
GEOID99, the Link
Future Directions of the National CORS
Future Directions of the National CORS (continued)
GPS Modernization
Global Navigation Satellite Systems (GNSS)
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