Spatial Adjustment Manager (SAM)
   
Need to have Java enabled browser and Flash Player 6 to view these files  
   
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
 
To download these screen animation files, go to the Downloads page  

Tiling of the data
SAM tiles the data into 1 km squares (default square size can be modified) for the SAE. Tiles should not be so big as to increase processing time or so small as to involve unnecessary and reduntant processing due to the 100 metre buffer around each tile. One square km tiles offer a good compromise.

 

Allocation of these tiles to multiple PC's / users

On smaller jobs where all tiles are processed by one operator on one computer, allocation of tiles is not really an issue. On larger jobs where in order to fully ustilise resources it is necessary to allocate tiles to multiple PCs or operators, SAM provides for two levels of users: supervisors and operators. The supervisor allocates tiles to the operators.

Using the "Operators tab", each operator's name is entered and given a colour to represent the tiles they have been allocated. Allocating squares is done in the "Allocation tab" by clicking and dragging over the squares to be allocated to an operator. The Allocation tab then displays those squares with a coloured diagonal line in the colour of the operator.

 

Monitoring the progress of single / parallel processing over one or many PCs
Using the "Progress tab" the supervisor can determine the progress of the spatial adjustment. By placing the cursor over a square tile one can determine if the adjustment has been started on that particular tile, if it's in progress or if it has been completed and thereby determine the overall progress for a particular user / PC as well as the overall progress.

 

Compiling the adjusted spatial data
Compiling the adjusted spatial data consists of bringing together the adjusted tiles for error detection using feature level reporting later saving to the temporary work area. There is a 100 metre buffer around each of the 1square km tiles causing an overlap with surrounding tiles. SAM uses a weighted mean averaging process to deal with any mis-alignment between points in the buffer zone of multiple tiles.

 

Generating feature level reporting and detecting errors
Normally less than 0.2% of features end up having an error in the adjusted coordinates. To detect these possible errors SAM compares the co-ordinates of the original feature and the adjusted feature to calculate the changes in length, position and angles. These changes are sorted displayed from the biggest to the smallest. The Supervisor can use this list to zoom to each feature and inspect for possible errors.

 

Correcting errors found and writing the upgraded data to the temporary work area
Some errors may be rectified in SAM/SAE whilst other errors have to be fixed in the corporate GIS application. SAM links to the SAE's "Find, Fix and Forget" functionality which can be used to rectify many errors. SAM can also transfer the location of features to the corporate GIS application for final editing

For more information see the the SAM / SAE White Paper