[求助]请问下边这段信息说的是投影和坐标么？

 
<P>Data Type: Personal Geodatabase Feature Class <BR>Location: D:\等高线\kalamali2.mdb<BR>Feature Dataset: 2<BR>Feature Class: line<BR>Feature Type: Simple<BR>Geometry Type: Line</P>
<P>Projected Coordinate System: Beijing_1954_GK_Zone_15<BR>Projection: Gauss_Kruger<BR>False_Easting: 15500000.00000000<BR>False_Northing: 0.00000000<BR>Central_Meridian: 87.00000000<BR>Scale_Factor: 1.00000000<BR>Latitude_Of_Origin: 0.00000000<BR>Linear Unit: Meter</P>
<P>Geographic Coordinate System: GCS_Beijing_1954<BR>Datum: D_Beijing_1954<BR>Prime Meridian: 0<BR>Angular Unit: Degree<BR>上面这段信息是说的图的投影和坐标么？这是什么投影呢和坐标系呢？为什么我只添加Projected Coordinate System，没有Geographic Coordinate System就使图有Geographic Coordinate System的信息。这样的图能在上面计算面积么</P>

<P>没有geographic何来Projected，看来地图学没学好啊。高斯投影分带15带，6度，偏移500km，中央经线87度。</P>
<P>基础地理坐标系统， 椭球为北京1954系统所用椭球，基准面也是54，没了。</P>