GIS / IT Environment

Spatial Adjustment Engine (SAE)
take description from user manual.
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View SAM & SAE Screen videos SAM Utilities - Extents SAM Utilities - Operators SAM Utilities - Allocation SAM - Progress SAM - Data Explorer SAM - Data Explorer FME Objects SAE - Equivalent Points SAM Orthophotos - Control
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The SAE processes each individual tile as orchastrated by SAM. There are two algorithms available to upgrade spatial data: Least Squares Adjustment Algorithm Least Squares Adjustment Technique is generally preferred as it does provide the higest quality result, normally in reasonable times. For further reading on this algorithm see links below. The Best Guess Algortihm The Best Guess Algorithm, whilst not returning the best results, most often returns acceptable results in a fraction of the time. It has been found to be more than adequate in some scenarios. SAM OrthoPhotos is used to upgrade the orthophotgraphy digital cadastre and requires an operator to select matching points in the raster and vector layers. The speed of the Best Guess algorithm is sufficient to make the process fairly interactive. After running the Best Guess algorithm while interactively capturing matching points, the Least Squares Adjustment algorithm can still be run to generate the final results. The second situation where the Best Guess algorithm is the preferred solution is in utility upgrades where the utility layers are extremely detailed, being more of a cartographic product.
• Further, the Spatial Adjustment Engine has been designed right from the beginning to be scaleable, in all respects. This means 1. Small areas to large areas 2. Types of adjustments, including Road Centreline Upgrades using GPS, Utility Upgrades caused by upgraded Cadastre, and DCDB Upgrades to more accurately represent the true location of each parcel. 3. The SAE allows great flexibility in adding various types of control, now and in the future, from State Survey Marks, Deposited Plans, known bearings and distances, parallel lines, inclined lines, straight lines, etc.
Links to various papers from Spatial Web Consulting DCDB Upgrade Using Title Dimensions in a GIS Environment - The Pyrmont Project Aurisa 2000 - Roger Merritt, Alan Keown and Ewan Masters Digital Cadastral Upgrades - A Progress Report International Symposium on Spatial Data Quality - Roger Merritt and Ewan Masters Maintaining Spatial Relativity of Utilities after DCDB Upgrade International Symposium on Spatial Data Quality - Roger Merritt and Ewan Masters Maintaining Spatial Relativity of Utilities after DCDB Upgrade APAS '99 - Roger Merritt and Ewan Masters The Adjustment of Spatial Data An overview of the technique - Roger Merritt and Ewan Masters DCDB Upgrade - The Sutherland Shire Project PowerPoint Presentation - Roger Merritt The New Approach to the Upgrade of Cadastre and Utility Data OZRI '97 Conference Paper - Roger Merritt and Ewan Masters Upgrading Cadastre using Survey Accurate Measurements OZRI '98 Conference Paper - Roger Merritt and Ewan Masters