[求助]地理坐标转换

<P> <BR>GEOMETRIC DATA MAP PROJECTION =TM   ELLIPSOID =KRASSOVSKY         DATUM =KRASSO</P>
<P>USGS PROJECTION PARAMETERS = 6378245.0000000000000    6356863.0187999997000    <BR>1.0000000000000          0.0000000000000          111000000.0000000000000      <BR>0.0000000000000          500000.0000000000000     0.0000000000000              <BR>0.0000000000000          0.0000000000000          0.0000000000000              <BR>0.0000000000000          0.0000000000000          0.0000000000000              <BR>0.0000000000000          USGS MAP ZONE =0                                      <BR>UL = 1121948.0486E 223626.4368N 636758.586    2501709.138                     </P>
<P>UR = 1142003.8335E 221855.0969N 843695.593    2472559.255                      </P>
<P>LR = 1140332.0228E 204320.3987N 818738.674    2295388.381                      </P>
<P>LL = 1120431.1673E 210033.9386N 611801.667    2324538.264                      </P>
<P>CENTER = 1131200.0000E 214000.0000N 727748.630    2398548.760   3483  2982     </P>
<P>OFFSET =138    ORIENTATION ANGLE =-8.02                                        <BR>SUN ELEVATION ANGLE =38.3 SUN AZIMUTH ANGLE =145.9         </P>
<P>ETM影像头文件里的投影参数，规定数据源的投影为克拉索夫，基准面是克拉索夫，投影坐标是墨卡托投影，请问是否四个角的控制点坐标就是在这个地理参考条件下的坐标值？</P>
<P>现在想求算土地面积，如果想要做投影和坐标转换，该怎么进行？</P>
<P>Projected Coordinate System: Krasovsky_1940_Albers<BR>Projection: Albers<BR>False_Easting: 0.00000000<BR>False_Northing: 0.00000000<BR>Central_Meridian: 105.00000000<BR>Standard_Parallel_1: 25.00000000<BR>Standard_Parallel_2: 47.00000000<BR>Latitude_Of_Origin: 0.00000000<BR>Linear Unit: Meter<BR>Geographic Coordinate System: GCS_Krasovsky_1940<BR>Datum: D_Krasovsky_1940<BR>Prime Meridian: Greenwich<BR>Angular Unit: Degree<BR></P>