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model wishes to include analytical partial derivatives and/or analytical ground to image projection, the triangulation 
framework will accept them. The numerical methods can be used as a computational check for the analytical 
expressions. 
3.3.6 Robust Estimation 
The Danish Method of weight reduction for gross error detection will be first implemented into the framework level of 
the triangulation software. This method has the advantage of a relatively direct implementation. We are in the process 
of designing an implementation of the Data Snooping Method for gross error detection with external and internal 
reliability estimation. 
3.3.7 Sensor Factory 
Currently, the sensor factory contains several sensor classes: SPOT, LANDSAT, IRS-1C, various frame models, and a 
production version of the OrbView sensor. The geometric calibration sensor model for the OrbView satellites is under 
development. Future research is to include embedding the Alignment Kalman Filter into the triangulation software to 
allow for a simultaneous determinate of the all the attitude interlock angles. 
4 COMPUTER HARDWARE 
Off the shelf computer hardware suited to analytical triangulation is becoming widely available at reasonable prices. 
The computer hardware component of the Geometric Calibration System is one such example. The computer hardware 
requirements for the Geometric Calibration System are in the upper range of a high end workstation class machine. In 
particular, the system contains: dual Pentium III processors at 550MHZ; 1 GB of memory; 230 GB of storage in a 
RAID 5 disk tower; 24 inch (60cm) monitor; CD-RW; and a 100 BaseT network connection. The system currently 
inputs imagery through the CD-RW or the network connection. Prior to launch, the system will include either an 8mm 
or DLT tape drive for image transport and system backup. No stereo-viewing technology is required to measure points. 
The operating system for the computer system is Windows NT. X windows support is provided through a software 
package called Interix. UPS and backup generators maintain the electrical power for the computer system at a facilities 
level. 
Experience gained in developing the calibration range has shown that the hardware is sufficient for geometric 
calibration of the OrbView satellites. 
S ADDITIONAL REMARK 
The components of the Geometric Calibration System are suitable for geometric calibration of many types of 
photogrammetric and remote sensing cameras. Higher resolution sensors can be accommodated by augmenting the 
calibration range with a high resolution insert. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part Bl. Amsterdam 2000. 213