v20180710

Precision GPS Videos

General Videos

Even if you are an experienced GIS, Mapping or Survey user you may have some questions about the realities of precision GPS real-world use:

  • Grid vs. Ground Measurements
  • U.S. Survey Feet vs. International Feet
  • Reference Frames vs. Datum: WGS84, NAD83, NAD83-CORS96, NAD83-2011, ITRF2000...
  • Best Practices for Collecting Data in the Field
  • Ellipsoid vs. Orthometric Elevations: Hey! My GPS always reads elevations that are 100 feet off

Mark Silver's videos may help you sort out these questions. Here is a recommended viewing list:

#1 Thumbnail U.S. Survey Feet vs. International Feet

  0.3048 vs. 0.30480061 what is the difference?

#2 Thumbnail Grid vs. Ground Distance Measurements

  Why does my GPS measure distances short?

#3 Thumbnail Ellipsoid vs. Orthometric Elevations

  Why is the elevation on my GPS receiver off 70 feet?

# 4 Thumbnail Best Practices for Maximizing GPS Accuracy

  How do you hold your receiver while collecting data to maximize accuracy?

#5 Thumbnail OPUS Projects Example

Matches the American Surveyor Article found [ here ]

Other videos that you should watch:

Spectra Precision / Ashtech MobileMapper Field V3.0

Carson Survey, Carlson Civil Suite, Carlson Desktop

#16.1

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Which Carlson Desktop product should you purchase?
Survey, Civil Suite, Construction, Takeoff? Have an evaluation plan!
#16.2

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Installing Carlson Desktop Products
Step-by-step guide to installing Carlson Desktop products
#16.3 Thumbnail A Simple Survey Job
Step-by-step guide to a simple survey job, field to plotter.
#16.4 Thumbnail Mouse Selections
Crossing - Window - Fence - Selections
#16.5 Toolbar Disaster Recovery
HELP! All my toolbars are missing!
#16.6 Command Line Dialog Offscreen
I have two monitors (dual screens) at the office on my laptop, when I left the office, I still had the command line dialog on the second screen. How do I get it back to the main screen?
#16.7 Thumbnail Carlson Software: Changing the Default Project Folder
How to change the default project folder.
#16.8 Thumbnail Carlson Software: Mouse Moves and Buttons
Left click, right click, middle click and roll. Step-by-step tricks.
#16.9 Carlson Software: Lines, 2D and 3D Polylines
What's the difference!?
#16.10

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Carlson Software: Locking points in CRD Files
Step-by-step guide to using CRDB files which allow point locking.
#16.11 Carlson Software: Labeling BOTH Grid and Ground
Step-by-step guide to dimensioning both GRID and GROUND, automatically on a drawing.
#16.12 Carlson Software Geodetic Bearings and Distances
You can dimension and inverse to Geodetic Mean Bearings and Elevation Distances in Carlson. This is a step-by-step guide.
#16.13 Is the InteliCAD Engine Slow?
It is plenty dang fast. Here is an example of a large subdivision with a big raster background. Seems to be instantaneous on my little laptop.
#16.14 Carlson Software: Surface from ASCII Point List
Quick, simple, step-by-step.
#16.15 Carlson Software: Using a ESRI Mapserver for background maps in Carlson Products
You can download, import and display raster objects in Carlson with the built in map server option. Step-by-step example.
#16.16 Carlson Survey: Dynamic Scale Factors for Grid to Ground

For large surveys it is usually not possible to select a single Grid to Ground combined scale factor that satisfies an accuracy expectation if there is substantial elevation difference or a significant change in the Grid (projection) scale factor over the job extents.

It is possible to configure Carlson Survey to use a dynamic scale factor that is computed for each vector (based on the endpoints) that will exactly express the ground distance. This results in boundary lines that are annotated with the correct Ground distance, even if the project is huge or has extreme elevation changes.

This video show how to implement dynamic combined scale factors and how to insert a table that includes the geodetic coordinates, ellipsoid elevation, convergence, state plane coordinates, orthometric height and the point scale and CSF's.

SurvCE and FAST Survey

#20.0 Thumbnail Setting Power Line Anchors
#20.1 Thumbnail Carlson SurvCE: Using IGS08/WGS84 framed corrections sources to record NAD83 features
#20.2 Thumbnail SurvCE: Adding Raster Background Maps
#20.3 Thumbnail SurvCE: Setting and Using Scale Factors in the Field
#20.4 Thumbnail SurvCE: Aligning Record and Found Data
#20.5 Making a Geoid Separation File.
Required to display orthometric elevations
while working in the field.
#20.6 Thumbnail Configuring a CHC X91+ or X900+ RTK Receiver as a UHF Base
Step-by-step base configuration.
#20.7 Thumbnail Configuring a CHC X91+ or X900+ RTK GPS as a UHF Radio (Internal CHC Radio)
Step-by-step UHF rover configuration.
#20.8 Thumbnail Configuring a CHC X91+ or X900+ RTK GPS as a NTRIP Rover in a VRS Network
Step-by-step Network Rover configuration.
#20.9 Grid to Ground and Localization https://youtu.be/22qjTzfyLqE
#20.10 Aligning a new survey, at ground, to the record bearing.

How do you start a new survey, in local coordinates, at ground (scaled to ground) and aligned to a record bearing?

#20.11 Changing distance units of collected data.
#20.12 Rover side Base translation
#20.13 SurvCE: Grid to Ground with Averaged Scale Factor

If a project covers a very large area there may be significant differences in combined scaled factor over the project. SurvCE has a simple tool to average two or more points and compute a CSF that better represents Grid to Ground Scale Factors.

#20.14 SurvCE: Total Station at Grid, merging GPS and optical data

Usually you mix Total Station data with GPS at Ground. Is is possible to mix data at Grid? What are the advantageous of using a single scale factor vs. using automatic scale factors for each optical shot?

#20.15 SurvCE: Mixing Geographic Coordinates with Projected Coordinates using the COGO calculator

You can use the COGO: Calculator: LLH-Grid tool to insert Lat/Lon coordinates,Ellip or Ortho Heights into a LDP or Local Coordinate System at ground. This video shows how.

#20.16 SurvCE: Defining a LDP in the field

How to quickly define a custom Low Distortion Projection (LDP) in the field using SurvCE. The LDP generates a projected surface, at ground, with True North as the basis-of-bearings.

#20.17 Carlson Survey: Dynamic Scale Factors for Grid to Ground

For large surveys it is usually not possible to select a single Grid to Ground combined scale factor that satisfies an accuracy expectation if there is substantial elevation difference or a significant change in the Grid (projection) scale factor over the job extents.

It is possible to configure Carlson Survey to use a dynamic scale factor that is computed for each vector (based on the endpoints) that will exactly express the ground distance. This results in boundary lines that are annotated with the correct Ground distance, even if the project is huge or has extreme elevation changes.

This video show how to implement dynamic combined scale factors and how to insert a table that includes the geodetic coordinates, ellipsoid elevation, convergence, state plane coordinates, orthometric height and the point scale and CSF's.

Grid to Ground Specific

Carlson Survey: Dynamic Scale Factors for Grid to Ground

For large surveys it is usually not possible to select a single Grid to Ground combined scale factor that satisfies an accuracy expectation if there is substantial elevation difference or a significant change in the Grid (projection) scale factor over the job extents.

It is possible to configure Carlson Survey to use a dynamic scale factor that is computed for each vector (based on the endpoints) that will exactly express the ground distance. This results in boundary lines that are annotated with the correct Ground distance, even if the project is huge or has extreme elevation changes.

This video show how to implement dynamic combined scale factors and how to insert a table that includes the geodetic coordinates, ellipsoid elevation, convergence, state plane coordinates, orthometric height and the point scale and CSF's.

SurvCE: Defining a LDP in the field

How to quickly define a custom Low Distortion Projection (LDP) in the field using SurvCE. The LDP generates a projected surface, at ground, with True North as the basis-of-bearings

SurvCE: Total Station at Grid, merging GPS and optical data

Usually you mix Total Station data with GPS at Ground. Is is possible to mix data at Grid? What are the advantageous of using a single scale factor vs. using automatic scale factors for each optical shot?

SurvCE: Grid to Ground with Averaged Scale Factor

If a project covers a very large area there may be significant differences in combined scaled factor over the project. SurvCE has a simple tool to average two or more points and compute a CSF that better represents Grid to Ground Scale Factors.

Here is a great resource for Grid-to-Ground and Localization in Carlson SurvCE

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Grid vs. Ground Distance Measurements

  Why does my GPS measure distances short?

   

GNSS Soltions

 MobileMapper 100, ProMark 100/120/200/220 Hints

ProMark 3 Training Videos

[ Click here to download the data files used in the PM3 training video ]

#51 ProMark 3 GPS Training Chapter 0: Introduction
#52 ProMark 3 GPS Training Chapter 01A Setting Up A Base
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ProMark 3 GPS Training Chapter 01B Bar Initialization Stop And Go

#54 Thumbnail

ProMark 3 GPS Training Chapter 01C Post-Processing Stop And Go

 

#55 Thumbnail

ProMark 3 GPS Training Chapter 02A Full Static Rover Shots

#56 Thumbnail

ProMark 3 GPS Training Chapter 02B: Post-Processing Static Rover Shot

#57 Thumbnail

ProMark 3 GPS Training Chapter 03A Stop And Go without Bar Init

#58 Thumbnail

ProMark 3 GPS Training Chapter 3B Processing Stop And Go

#59 Thumbnail

ProMark 3 GPS Training Chapter 4A Processing Against Real World Coordinates

#60 Thumbnail

ProMark 3 GPS Training Chapter 04B Establishing Control For Base Or Reference

#61 Thumbnail

ProMark 3 GPS Training Chapter 04C GNSS Archiving

#62 Thumbnail

ProMark 3 GPS Training Chapter 04D Mission Planning

#63 Thumbnail

ProMark 3 GPS Training Chapter 04E Importing NGS Antenna Calibrations Into GNSS

#64 Thumbnail

ProMark 3 GPS Training Chapter 05B Loading background GeoTiff

#65 Thumbnail

ProMark 3 GPS Training Chapter 05C PM3 USB Cable

#66 Thumbnail

ProMark 3 GPS Training Chapter 06A Setting Up a Tripod

OPUS-S; OPUS-RS

All Topo Maps Videos
 

#70 ATM101: All Topo Maps Version 7 Training Suite

The complete All Topo Training DVD is available for viewing online:

[ Training Video: Click Here! ]

 also available on DVD:

#71 Building Topomaps for Garmin GPS Receivers
using BigTopo9 to build topographic basemaps for the Garmin: Astro 320, Colorado, Dakota, eTrex 20/30/25/35, GPSMap 62/64/78, Montana, Oregon, Rino 600 and Dakota GPS receivers.
This will work on any Garmin receiver that can accept 'Custom Maps'.
[ Watch on YouTube ]

#72 Building and using BigTopo base maps for ArcPad
using BigTopo to build topographic basemaps for ArcPad projects.
[ Watch on YouTube ]

#74 Building and using raster background maps on the Magellan ProMark 3 (Survey and MM)
using BigTopo to build topographic basemaps for the 'Survey' and 'MobileMapping' program on the Magellan ProMark 3 GPS receiver.
[ Watch on YouTube ]

#75 Building and using raster background maps in Fast Survey/Carlson SurvCE
The latest versions of Ashtech FAST Survey and Carlson SurvCE allow you to register background raster images. BigTopo9 will directly build tiled coverage and image database files for your data collector. This is a real time saver!

 

 

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