2017 Vendor Showcase Track: Tracking Z: Limitations of the World We Live In
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The document discusses digital elevation models and how they are used to create terrain features and analyze spatial relationships. It notes that digital elevation models can be represented as TINs or rasters and are used to derive slope, hillshade, viewsheds, watersheds and point visibility. The document also mentions potential errors from GPS, data, projections and geodesy that can impact digital elevation models.
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2017 Vendor Showcase Track: Tracking Z: Limitations of the World We Live In
- 1. Presented by Brady Hustad President Argis Solutions
- 2. 9/20/2017© 2017 Argis Solutions | Z and the World | GISITR17 2 Contour s TINDEM Digital Elevation Model Triangulated Irregular Network Hypsography
- 3. 9/20/2017© 2017 Argis Solutions | Z and the World | GISITR17 3 slope hill shade viewsheds watersheds point to point visibility
- 4. 9/20/2017© 2017 Argis Solutions | Z and the World | GISITR17 4
- 5. © 2017 Argis Solutions | Z and the World | GISITR17 59/20/2017
- 6. 9/20/2017© 2017 Argis Solutions | Z and the World | GISITR17 6 GPS Error General Data Error Projection Error Geodesic Error
- 7. © 2017 Argis Solutions | Z and the World | GISITR17 79/20/2017
- 8. 89/20/2017© 2017 Argis Solutions | Z and the World | GISITR17
- 9. © 2017 Argis Solutions | Z and the World | GISITR17 99/20/2017
- 10. 9/20/2017© 2017 Argis Solutions | Z and the World | GISITR17 10
- 11. 9/20/2017© 2017 Argis Solutions | Z and the World | GISITR17 11 (relative elevation)
- 12. 9/20/2017© 2017 Argis Solutions | Z and the World | GISITR17 12
Editor's Notes
- Title slide: Z and the Real World: Beyond the Restraints of the Flat Map
- Elevation Data Quick Overview DEM (Digital Elevation Model) – Grid pattern of elevation, same for all areas TIN (Triangulated Irregular Network) - Irregulars triangles marking elevation, lots in high relief, few in low relief Contours (Hypsography) – lines that follow specific elevations
- Why Elevation? Slope Hill Shade Viewsheds Watersheds Point to Point Visibility All these can be done with a 2 D maps with the x/y of your data in a 3D world.
- 3D is critical why you should care Escape plans are now in 3D. The new 911 plan from the federal government will require knowing what floor a person on in an evacuation based on the GPS in their cell phone. Impractical yes but it’s a mandate now so its coming. But Seriously Why Elevation? 2D world elevation wasn’t helpful in general 3D world elevation is one of the 3 primary coordinates!
- How do you collect Elevation? - Must be a better way. GPS? DEM? LiDAR? Models for why aren’t they use this.
- Inherent Inaccuracy Geodesic Error GPS Error General Data Error Projection Error (projection is a ellipsoid flattened, projecting on to a round earth. Can we can we skip projection?
- Does this accuracy matter? Yes! And No… We are caught in a trap, we need to constantly strive for better more accurate data, while not forgetting to realize that the data we currently have is still very valuable in it’s current accuracy No projection! 3D model (x,y,z) A: surveys striving to have more accurate data. Elevate reverse triangle – who has more budget: manager of many things has more money. The manager of may things is off by 50 feet. What does it hit? His map is off. If you have to make him care about his data elevate the value of your accurate data so you can. And you can do that because technology is ready to help you. 3d models –sit in front your elevate to more important SLIDE: red ex through middle picture (projection) simplify the geometric math, vectors working in a pure 3d model. WHAT IF: you already had xyz data in the field with no projection?
- The different use of elevation data in the future Putting the data on the real world is different than laying data on a 2d map Accuracy to the real world versus projection Ability to use the real world to add accuracy
- Introduce Relative Elevation (Why z inaccurate? Why is GPS inaccurate N.S inaccurate) GPS Z – Inaccurate picture Many data sets without Z, or without accurate Z Z mattering more in relation to the world than accurate to a projection Make Z relatives to the world. Z man slide to slide – hugging the earth – Make DATA Z FRIENDLY <3 MAKING OUR Z’s MATTER TO THE WORLD. (relative elevation)
- What is Relative Elevation Elevation tracked in relation to an accurate DEM. Pipe -1 meter relative (999 meters) Overhead line +4 meters relative (1004 meters) Earth 0 meter relative (1000 meters) If you have Z, simply do basic subtraction from a DEM in your projection. By doing this, your view in a 3D real world, will be accurate to the real world, or more accurate. Allows a quick starting part to get 3D (z) data setup for your existing data sets. Takes away GPS Inaccuracy – the gps is still inserting GPS inaccuracy. You will always have that accuracy. The person is connected to z. the person and pipe – range of GPS accuracy. Its always going to be on the earth to texgture not pfigurte its creates a level to work with.
- Conclusion Accuracy OR What, realistically needs to be visualized to get the job done in the field? What can you do to make it more accurate? *(RELATIVE ELEVATION) * Elevation Relative to the world is what 3D AR needs, otherwise relative to the model you are putting your data into and what you can do to make it accurate there - projection maps are going away A new way to get a better, usable elevation Quick, effective for real world use Gets a starting point
- The future AR in the field. Things are changing. And 3d a revolution accurate X-YZ Transitional data. Need a slide?: BECAUSE AR IS COMING. Just like capturing GIS data for hidden assets was a game changer in the last 20 years, creating data that is AR “friendly” will guarantee its continued use in the next 2 decades and beyond. Tim Cook is already on record saying that augmented reality will be "one of those huge things that we’ll look back at and marvel on the start of it," indicating a deep interest and commitment to the possibilities that imposing virtual objects on the real world could offer. https://www.wsj.com/articles/apple-aims-to-take-augmented-reality-mainstream-1504876464 (subscription)
- Questions and Answers – available out after this for demo of our AR mobile technology – the Argis Lens < YOUR CALL