Re: [OSSIM] Getting cib geometry

[Oscar L. K. <Kra...@ge...>]

The tie point lat/lon (or easting northing) corresponds to image point (0,0)

-----Original Message-----
From: Bunch, Walter L (388D) [mailto:wal...@jp...] 
Sent: Tuesday, January 10, 2012 12:50 PM
To: Ossim users
Subject: [OSSIM] Getting cib geometry

Some time ago, I could get lines, samples, and corner lat/lons from a cib dataset by calling ossimImageHandler.getImageGeometry(), which now produces keyword value pairs like:

projection.datum:  WGE
projection.elevation_lookup_flag:  0
projection.ellipse_code:  WE
projection.ellipse_name:  WGS 84
projection.false_easting_northing:  (0,0)
projection.false_easting_northing_units:  meters
projection.major_axis:  6378137
projection.minor_axis:  6356752.3142
projection.origin_latitude:  34.7493606138107
projection.pixel_scale_units:  degrees
projection.pixel_scale_xy:  (9.73857340720222e-06,8.99136828644501e-06)
projection.srs_name:  EPSG:4326
projection.tie_point_units:  degrees
projection.tie_point_xy:  (-118.510798454813,35.0117602101982)

Given the pixel_scale_xy and tie_point_xy, I could calculate the lat/lons of particular pixels, but this doesn't tell me the width and height in pixels. I also don't know which pixel this tiepoint is for (I assume the upper-left pixel), and I don't know whether the tiepoint is in the center of the pixel or at the upper-left corner of that pixel area. So my questions are:

Where can I find the width and height in pixels?
Which pixel does the tiepoint tie to?
Does the tiepoint tie to the center or upper-left corner of the pixel?

Thanks,
Walt


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