529 
also shipped to the NOAA DDC to serve as archival 
masters for user digital products. Products 
produced by TIPS are determined by user acquisition 
and product orders placed by NOAA or the Landsat 
Science Office at GSFC, 
TM SYSTEM PERFORMANCE 
The following statement of TIPS performance is based 
upon an analysis of TM data from Landsat-4 processed to final 
products by the TIPS. Geometric correction accuracy was 
determined by direct measurement of errors in corrected 
imagery using control points. The results of the evaluation 
are summarized in Table 3. The range of 90% geodetic 
accuracy and temporal registration errors in the cross track 
and along track directions are shown. The results indicate 
that the TM data can meet the temporal registration and 
geodetic specifications. During the Research and Development 
phase the geometric correction system will be further 
calibrated and performance improvements are expected. 
  
  
  
TABLE 3 
SUMMARY OF 90% ERRORS (PIXELS) 
CROSS ALONG 
TRACK TRACK 
-CASE RANGE RANGE SPECIFICATION 
Direct Measurement 
Tempora] Registration: ^.16 - .,32 25 = 432 2 
Geodetic Registration: .46 - .52 ‚32 = ,56 ‚5 
  
  
Radiometric performance was evaluated by computing 
the range for each scan based on scan line means after 
variation due to scene content has been filtered out. The 
specified requirement calls for the scan range to be less 
than 2 (+1) quantum levels. Table 4 shows a Radiometric 
Quality Index (RQI) for 9 areas, averaged over the number of 
scans indicated. Also indicated (in parenthesis) is the 
number of scans that exceed the 2 quantum level range, where 
applicable. 
The system is correcting within specification, 
except occasionally-for-band-7/.--Ihe:band-”. problem is caused 
by an extremely noisy detector (detector 7) and solutions are 
under consideration. 
TIPS is currently processing all, TM data acquired, 
up to a maximum of 100 scenes per day (700 scenes per week) 
to archival product (HDTA) and producing 12 film products 
and 2 digital products per day in preparation for ramping up 
to the specified production. levels of 50 film products and 10 
digital products peroday by/January:;1985.