Large Fermat 
Pletter 
  
     
NARSAP 
Facility Diagram 
  
  
  
Figure 1 Proposed Configuration 
Protocol Ethernet connection to other systems would 
be required. 
Imagery to be supported would include: 
-Conventional black-and-white aerial 
photography 
-Color infrared aerial photography 
-Landsat MSS 1972-1979 (MSS-X data) 
-Landsat MSS 1979-present (MSS-P data) 
-Landsat TM/ETM "Fast Format" 
-Landsat MSS/TM/ETM swath data 
-Spot 1A and 1B 
-AVHRR 
The imagery would be used only in digital form. Any 
film products would have to be digitized. It was 
anticipated that an appropriate scanner would be 
acquired as part of another modernization project in 
the USGS. 
Other data formats that the system would have to be 
able to accept included: 
-Digital line graph-3 data 
-Digital line graph-O data 
-Spatial Data Transfer Standard 
-USGS digital elevation model data 
-DMA digital terrain elevation data 
-TIGER (census) data 
-Advanced  Cartographic System digital 
orthophoto export data -Published USGS 
digital orthophoto data 
The specifications would describe the basic processing 
functions in relation to image processing, mensuration 
274 
and geopositioning, and multispectral classification and 
processing capabilities. The image processing 
functions would have to make efficient use of the 
various image types within the context and capabilities 
of an interactive GIS. The image processing 
capabilities would require exploiting all specified image 
types either independently or synergistically. 
The system would also have to support the stereo 
display of images. The stereo display would be 
maintained through the use of rigorous 
photogrammetric models. Polynomial image-to-image 
transformations would be allowed only when 
knowledge of the exposure parameters was insufficient 
to permit derivation of a photogrammetric stereo 
model. Polynomials derived from rigorous 
photogrammetric models, though, would be used for 
realtime implementation of stereo models. 
For photogrammetric operations, mensuration 
functions would include the measurement of fiducials, 
pass points, control points, and profiling. Digital 
image correlation functions would also be required for 
the production of digital elevation models. 
Image mensuration capabilities would have to include 
the determination of geocoordinates and the 
computation of distances, areas, azimuths, volumes, 
and the heights of operator-selected points. Height 
measurement capabilities would have to include 
measuring heights from stereo imagery, from 
monoscopic relief displacement, and from the 
measurement of shadows. 
Geometric registration capabilities would require 
registering an image to an image or an image to à 
map Or 
projectic 
transfor: 
Transfo: 
The im 
system \ 
The bas 
include: 
A GIS 
system. 
vector ¢ 
system’: 
would b 
the GI: 
Without 
other w 
The GI 
based 
Superin 
stereos: 
have to