List of Figures

Frontmatter

• Fig. 1: OPUS Projects supports the submission of GNSS survey data to NGS for publication on Datasheets

Quick Start Guide

• Fig. 2: NGS Survey Project Proposal Form

• Fig. 19: GVX Vector Listing

• Fig. 20: Scatter Plots for Baseline “brun-mas2”

• Fig. 21: “Update GVX” Button (highlighted in yellow)

• Fig. 22: GVX Baseline Statistics Window

• Fig. 25: “Set up Adjustment” Button (highlighted in yellow)

• Fig. 26: Horizontal-Free Adjustment Available Solutions

• Fig. 27: Horizontal-Free Adjustment Settings

• Fig. 28: Map Window with Adjustment Results

• Fig. 29: Map Window with Mark Info Tooltip

• Fig. 30: Mark Page

• Fig. 5: “Preferences” Button (highlighted in yellow)

• Fig. 3: Input screen to create a project in OPUS Projects

• Fig. 31: “Show File” Window

• Fig. 6: “Data & Solution Quality Thresholds” Window

• Fig. 4: Location of the Preferences button on the OP Manager’s Page

• Fig. 12: “Upload GNSS Vectors” Button (highlighted in yellow)

• Fig. 7: Location of upload descriptions and field log buttons on the OP Manager’s Page

• Fig. 8: Upload a photo button on the user mark page

• Fig. 13: Upload GNSS Vectors Window

• Fig. 9: OPUS GNSS data file upload page

• Fig. 14: GVX-file Selection Confirmation

• Fig. 10: OPUS single file processing results are available under “Show File” and on the individual user mark page

• Fig. 15: “Upload GNSS Vector (.gvx) File” Button (highlighted in yellow)

• Fig. 11: Add/Delete CORS pop-up window

• Fig. 16: Map Display with GNSS Vectors

• Fig. 23: Session processing sequence

• Fig. 17: Vectors for Baseline “e087-umbc”

• Fig. 24: Network adjustment window showing sequence of five network adjustments when a NGS Tracking ID is used.

• Fig. 18: Repeat Measurements Scatter Plot

1. Introduction

• Fig. 1.1: Sample OPUS Projects Manager’s Page showing all five network adjustments

• Fig. 1.2: OPUS Projects Create, Session, and Manager access page

• Fig. 1.3: Conceptual diagram of OPUS Projects workflow

2. NGS Survey Proposal

• Fig. 2.1: NGS home page showing how to access NGS Survey Project Proposal Form

• Fig. 2.2: The NGS Survey Project Proposal Form

3. Create Your Project in OP

• Fig. 3.1: Access to OPUS Projects by way of the OPUS Front Page

• Fig. 3.2: Create New Project

• Fig. 3.3: * Fields, Information to Enter

• Fig. 3.4: Click Map

• Fig. 3.5: Create Project

• Fig. 3.6: Project Creation Confirmation Report

4. Review and Edit Project Preferences

• Fig. 4.1: Review and Edit Project Preferences

• Fig. 4.2: Save Project Preferences

• Fig. 4.3: Project Title, ID and Keywords Report

• Fig. 4.4: CC’ing Team Members

• Fig. 4.5: Data & Solution Quality Thresholds

• Fig. 4.6: Data Processing Defaults

• Fig. 4.7: Session Definition

• Fig. 4.8: Mark Co-location Definition Settings

• Fig. 4.9: Saving Your Preferences

5. Naming Files Correctly for Best Results in OP

• Fig. 5.1: RINEX File Header

• Fig. 5.2: Close-up, Eye-level and the Horizon

6. Loading GNSS Observation Files

• Fig. 6.1: OPUS processing customization options

• Fig. 6.10: Click on a user marks for access to the corresponding Mark page

• Fig. 6.11: User Mark web page

• Fig. 6.2: Project Identifier Option

• Fig. 6.3: Options Customization Confirmation Report, “Skip Description” National Spatial Reference Network Inclusion or Not

• Fig. 6.4: Data upload verification email indicating a project preference was not met

• Fig. 6.5: Rejection of an upload to OPUS providing an explanation of probably cause

• Fig. 6.6: Show File button to access all solution reports

• Fig. 6.7: OPUS Solution results

• Fig. 6.8: Manager’s Page, showing information on data files associated with a user mark

• Fig. 6.9: Manager’s Page showing “Occupation” information from the “ALL OPUS Results” Report Table

7. Walking Through OP Visualizations

• Fig. 7.1: The Project Manager’s web page

• Fig. 7.10: The Controls bar

• Fig. 7.11: Top page control options

• Fig. 7.12: Preferences button on the Controls bar

• Fig. 7.13: Project List button on the Controls bar

• Fig. 7.14: Solutions button on the Controls bar

• Fig. 7.15: Manage Solutions pop-up window

• Fig. 7.16: Add Tracking ID button on the Controls bar

• Fig. 7.17: Attach NGS Project Tracking ID pop-up window

• Fig. 7.18: Show File button on the Controls bar

• Fig. 7.19: Pop-up window showing a sample solution from a processed session

• Fig. 7.2: The Notices banner on the OPUS Projects Manager’s Page

• Fig. 7.20: Send Email button on the Controls bar

• Fig. 7.21: Send Email Message pop-up window

• Fig. 7.22: Upload Description button on the Controls bar

• Fig. 7.23: Choose WinDesc Description Files for loading into project (pop-up window)

• Fig. 7.24: Upload Field Logs button on the Controls bar

• Fig. 7.25: Choose Field Log to upload pop-up window

• Fig. 7.26: Refresh PID Information button on the Controls bar

• Fig. 7.27: Confirmation or Cancel PID Refresh

• Fig. 7.28: Setup Adjustment button on the Controls bar

• Fig. 7.29: Setup Adjustment Type, Include Available Solutions pop-up window

• Fig. 7.3: Drop-down menu location for displaying results on the Manger’s Page

• Fig. 7.30: Upload Project Report button on the Controls bar

• Fig. 7.31: Review and Submit to NGS button on the Controls bar

• Fig. 7.32: Delete Project button on the Controls bar

• Fig. 7.33: Delete Project confirmation pop-up window

• Fig. 7.34: MARKS and Sessions Table showing summary occupation data for all sessions

• Fig. 7.35: Solution Statistics for All Sessions Table that can be displayed on the Manager’s Page

• Fig. 7.36: Symbology for distinguishing between user marks, CORSs, and baselines

• Fig. 7.37: Add Marks and Add/Delete CORS buttons on the Manger’s Page

• Fig. 7.38: Reminder pop-up window for uploading observation files to the project through the OPUS upload page

• Fig. 7.39: The Add/Del CORS management pop-up window

• Fig. 7.4: Map zooming toggles

• Fig. 7.40: Submitting Comments to & Asking Questions of the OPUS team

• Fig. 7.41: Restricted access to session processing

• Fig. 7.42: Sessions Page prior to session processing

• Fig. 7.43: Solution Quality Indicators

• Fig. 7.44: Session solution quality indicators showing a threshold exceeded

• Fig. 7.45: Satellite Data Availability

• Fig. 7.46: The Set up Processing button on the Session page Controls bar

• Fig. 7.47: Accessing a mark page from the Manager’s Page

• Fig. 7.48: Example mark page

• Fig. 7.49: Mark page toggling from the map

• Fig. 7.5: Map background options

• Fig. 7.50: Mark page zoom controls

• Fig. 7.51: Datasheet Retrieval by way of a user mark with a PID in the NG database

• Fig. 7.52: Show File button on the mark page Controls bar

• Fig. 7.53: OPUS Solution Report for a user mark

• Fig. 7.54: The Change Mark ID button on the Mark page Controls panel

• Fig. 7.55: Change Mark ID pop-up window

• Fig. 7.56: The Remove Mark button on the Mark page Controls bar

• Fig. 7.57: Confirmation pop-up window for removing a mark from the project

• Fig. 7.58: Mark Description Summary

• Fig. 7.59: Upload A Photo button within the mark description summary

• Fig. 7.6: Mark ID shown by hovering over mark

• Fig. 7.60: Upload photos pop-up window

• Fig. 7.61: Example showing successfully loaded photos on a mark page

• Fig. 7.62: Save Description button within the mark description summary

• Fig. 7.63: Occupation information on a mark page

• Fig. 7.64: Manage Data Files button on the mark occupations table

• Fig. 7.65: Manage a mark’s data file pop-up window

• Fig. 7.66: Save Occupations button on the mark occupations table

• Fig. 7.67: Manage Coordinates button on the mark processing results table

• Fig. 7.68: Manage a mark’s coordinate pop-up window showing coordinates, reference frame, and assumed errors (sigmas)

• Fig. 7.7: Mark data information shown when clicking on a user mark icon

• Fig. 7.8: CORS ID shown when hovering over a CORS

• Fig. 7.9: CORS data information shown when clicking on the CORS icon

8. Mark Descriptions

• Fig. 8.1: WinDesc program main screen

9. Selecting CORS

• Fig. 9.1: Add/Delete CORS button on the project map

• Fig. 9.10: Example of a CORS coordinates page showing reference to the CORS monument

• Fig. 9.11: Example of a CORS position referencing the monument

• Fig. 9.12: Example of a CORS position referencing the Antenna Reference Point (ARP)

• Fig. 9.13: CORS network accuracy shown on the station’s datasheet

• Fig. 9.14: Example of CORSs plotted with respect to a 250 km radius from the centroid of the project

• Fig. 9.15: CORS map showing CORSs plotted with respect to a 250 km radius from the centroid of the project

• Fig. 9.16: Example of a CORS short-term plot showing both bias and random error

• Fig. 9.17: Example of a short-term CORS plot exhibiting little bias and low error

• Fig. 9.18: Screen captures showing the steps used in adding a CORS from the Manager’s Page (see 7.1.7)

• Fig. 9.2: Add/Delete CORS pop-up window

• Fig. 9.3: CORS information bubble on the Add/Delete CORS window

• Fig. 9.4: List of all CORS included in the project as seen on the Manager’s Page

• Fig. 9.5: Map of CORS stations on the CORS web page, showing a 250 km radius around a selected location

• Fig. 9.6: Example of a spreadsheet used to help select the best CORSs for a project

• Fig. 9.7: EData availability for the CORS “GODE” in early April 2021

• Fig. 9.8: Data availability for a CORS not in the NOAA CORS network will appear blank

• Fig. 9.9: Example coordinates page for the CORS LOY8 showing computed velocities

10. Session Processing

• Fig. 10.1: Accessing the Session Processing Page

• Fig. 10.10: The seven email attachments (sent to the project manager) resulting from session processing

• Fig. 10.11: Select “ALL SESSIONS” from the Manger’s Page to reveal the results of any/all session processing

• Fig. 10.12: Clicking on the session of interest in the “Occupation” table showing “ALL SESSIONS” will open the session page

• Fig. 10.13: Mark information displayed on at particular session page

• Fig. 10.14: Session results presented on a mark page

• Fig. 10.15: Session Solution Statistics are available from the Manager’s Page

• Fig. 10.16: Example of session solution statistics

• Fig. 10.17: The Show File button on the Manager’s Page controls bar

• Fig. 10.18: Example of a session solution processing report (*.txt file)

• Fig. 10.19: Example solution statistics for all sessions

• Fig. 10.2: Example Session processing page

• Fig. 10.3: Example session processing page noting the one hub constrained 3D under “User” selected network design

• Fig. 10.4: Manage a mark’s data file pop-up window

• Fig. 10.5: Manage a mark’s data file pop-up window

• Fig. 10.6: Manage a mark’s data file pop-up window

• Fig. 10.7: The “Perform Processing” button at the top of the Session Processing Page

• Fig. 10.8: The OP Session Processing confirmation window

• Fig. 10.9: Manager’s Page showing six successfully processed sessions

11. Network Adjustments

• Fig. 11.1: Conceptual work flow for running adjustments in OP1

• Fig. 11.10: Sample network solution processing report showing a “no check” mark

• Fig. 11.11: The explanation of a solution processing report showing “MARK ESTIMATED - A PRIORI COORDINATE SHIFTS”

• Fig. 11.12: Network solution processing report showing the coordinates of unconstrained marks

• Fig. 11.13: Network solution processing report showing coordinates of a constrained mark and the coordinate shifts between computed and published coordinates

• Fig. 11.14: Sample output from the PREPLT2 file

• Fig. 11.15: Preliminary Network Adjustment window showing OP recommendation for a single hub 3D constraint

• Fig. 11.16: (1) a rejected vector; (2) a session (0987A) with large residuals; and (3) the large residual in the “Up” direction

• Fig. 11.17: Example of a histogram plotting the unadjusted vector differences from the COMPVECS output

• Fig. 11.18: Sample Horizontal Constrained Adjustment window showing 3-D constraints

• Fig. 11.19: Network solution processing report from the Horizontal Constrained Adjustment showing “MARK ESTIMATED - HORIZONTAL-FREE ADJUSTMENT COORDINATE SHIFTS”

• Fig. 11.2: Set up Adjustment button on the Manager’s Page controls bar

• Fig. 11.20: Network solution processing report from the Horizontal Constrained Adjustment showing “MARK ESTIMATED – PUBLISHED HORIZONTAL COORDINATE SHIFTS”

• Fig. 11.21: Computed - Observed residual values shown in the processing log output for the Horizontal Constrained Adjustment

• Fig. 11.22: Processing Report from the Horizontal Constrained Adjustment showing the results of the F-Test

• Fig. 11.23: Constraint Ratio Test as seen in the Processing Report of the Horizontal Constrained Adjustment

• Fig. 11.24: Network accuracies as shown in the Processing Log

• Fig. 11.25: Sample Vertical Free Adjustment constraint selection

• Fig. 11.26: Sample Vertical Constrained Adjustment constraint selection

• Fig. 11.27: the Horizontal Free Adjustment, the Horizontal Constrained Adjustment, and the published orthometric heights

• Fig. 11.28: Upload Project Report button on the Controls Bar on the Manager’s Page

• Fig. 11.29: The Review and Submit to NGS button on the Controls Bar on the Manager’s Page

• Fig. 11.3: Network adjustment windows with NGS Tracking ID and without

• Fig. 11.30: Example of the result of a project check where two items are missing or incomplete

• Fig. 11.4: The Manage Solutions window, enabling the user to rename or delete any solution in the project

• Fig. 11.5: Conceptual diagram of the relationships between session solutions and network solutions in OP

• Fig. 11.6: Sample Network Adjustment window showing the OP recommended selections for a Preliminary Adjustment

• Fig. 11.7: The “Perform Adjustment” button on the network adjustment page

• Fig. 11.8: Sample network adjustment confirmation pop-up window

• Fig. 11.9: Sample network solution selected from the individual user mark page