关于header文件的问题

<P>请教：怎么找出有用的信息了？</P>
<P>PRODUCT =08099259-01 WRS =120/04100 ACQUISITION DATE =20070507 SATELLITE =L5 INSTRUMENT =TM10 PRODUCT TYPE =MAP ORIENTED   PRODUCT SIZE =SUBSCENE                                                                                 TYPE OF GEODETIC PROCESSING =SYSTEMATIC RESAMPLING =CC RAD GAINS/BIASES =  0.99992/-0.0100  2.42430/-0.0232  1.36344/-0.0078  2.62901/-0.0193  0.58771/-0.0080  3.20107/0.25994  0.38674/-0.0040 VOLUME #/# IN SET =1/1 START LINE #=    1 LINES PER VOL=17080 ORIENTATION = -0.00 PROJECTION =TM   USGS PROJECTION # =     9 USGS MAP ZONE =     0 USGS PROJECTION PARAMETERS = 6378245.000000000000000 6356863.018773047300000       1.000000000000000       0.000000000000000     116.999987117997050       0.000000000000000  500000.000000000000000       0.000000000000000       0.000000000000000       0.000000000000000       0.000000000000000       0.000000000000000       0.000000000000000       0.000000000000000       0.000000000000000 EARTH ELLIPSOID =Krassovsky           SEMI-MAJOR AXIS =6378245.000 SEMI-MINOR AXIS =6356863.019 PIXEL SIZE =25.00 PIXELS PER LINE= 4170 LINES PER IMAGE= 2440 UL 1162400.3704E 271159.2007N    440562.500   3009962.500 UR 1172707.2640E 271201.1978N    544787.500   3009962.500 LR 1172659.3875E 263900.1992N    544787.500   2948987.500 LL 1162410.8229E 263858.2488N    440562.500   2948987.500 BANDS PRESENT =1234567 BLOCKING FACTOR =   1 RECORD LENGTH = 4170 SUN ELEVATION =66 SUN AZIMUTH =110 CENTER 1172703.3919E 265105.6192N    544819.148   2971315.438  4171  1547 OFFSET=-976 REVB</P>