later found this from sinodefence.
Quote:
Electro-Optical Digital Imaging Variant
Chinese media briefly reported on 25 May 2007 that the ChangZheng family of space launch vehicles had successfully conducted its 99th flight, sending two satellites into space. The CZ-2D launch vehicle, which was launched from Jiuquan at 15:12 local time (07:12 GMT) on 25 May 2007, carried the
YaoGan WeiXing 2 (Remote Sensing Satellite 2, RSS2) designed by China Academy of Space Technology (CAST, also known as 5th Space Academy), as well as a pico-satellite designed by Zhejiang University for scientific experiment.
It is understood that the satellite was actually a new-generation digital imaging reconnaissance satellite known as JianBing 6 in its military designation. It replaced the older FSW-4 film return type reconnaissance satellites to provide imagery intelligence capability for both military and civil users, with an estimated ground resolution of
0.6~1 metre. A second satellite
Yaogan Weixing 4 (RSS-4/Jianbing 8) was launched from Jiuquan on 1 December 2008.
full link:
http://www.sinodefence.com/space/spacecraf/yaogan.asp
currently, china is planning to launch yaogan-10.
even if yaogan-4,6,7 only have a similar resolution to
yaogan-2, the resolution still similar to cartosat-2 with
0.6~1 metre. (note:yaogan-1,3,5 uses sar imaging, the remote sensing method of yaogan-8 is still not public. yaogan-9 is noss type remote sensing satellite.)