tag:blogger.com,1999:blog-21167013.post3316357356526417836..comments2010-06-12T04:34:01.331-07:00Matt Gigerhttp://www.blogger.com/profile/08948284981378368476noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-21167013.post-11482271450715118482010-06-12T04:34:01.318-07:002010-06-12T04:34:01.318-07:00how to calculate bounding box from a given lat lng for ploting 3d model on google earthdsdfdsfdsfhttp://www.blogger.com/profile/04039563795845087147noreply@blogger.comtag:blogger.com,1999:blog-21167013.post-18725701436516922892010-06-12T04:33:37.325-07:002010-06-12T04:33:37.325-07:00how to calculate bounding box from a given lat lng for ploting 3d model on google earthdsdfdsfdsfhttp://www.blogger.com/profile/04039563795845087147noreply@blogger.comtag:blogger.com,1999:blog-21167013.post-77905018530626535692007-09-19T20:04:00.000-07:002007-09-19T20:04:00.000-07:00Is this still better than using bounding boxes?<BR/>I can see that you in many cases get better inclusion of the object itself.<BR/>But since indexes are used in a tree structure, how efficient are the solid angles that emcompass the child solid angles? This is important because this is where most of the checking and quick elimination will be done. Furthermore how efficient is it to do intersection test against a solid angle vs. solid angle compared to bounding box vs. bounding box?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-21167013.post-87350829476993871172007-09-19T11:03:00.000-07:002007-09-19T11:03:00.000-07:00I stand corrected. The problem is not distortion around the poles, but that the minimal coverage gets distorted with the bounding box method. Outlier points can stretch the corners of the bounding box so the coverage is far from minimal. The solid angle must encompass the lat/lon bounding box to ensure completeness, but the points may all lie within a circle that is completely enclosed within the lat/lon box.matt_gigerhttp://www.blogger.com/profile/08948284981378368476noreply@blogger.comtag:blogger.com,1999:blog-21167013.post-56252615039369408492007-09-19T10:48:00.000-07:002007-09-19T10:48:00.000-07:00What do you mean by the bounding boxes getting distorted? Just because it uses values close to the poles doesn't make them more distorted than anywhere else.<BR/>Distortion is only a problem when projecting data onto a flat paper/screen, but your indexes never gets projected, but remain in lat/long.Anonymousnoreply@blogger.com