[Openev-discuss] geotiff coordinates

[Wendell T. <we...@pm...>]

I have a tif image of an aeronautical sectional which is displayed
using the gview.app.file_open_by_name(), but the coordinates are
not correct.  Does the .tif file need processing to get the
coordinates into openev?

The tiffinfo about the file is shown below.  Are the unknown field
tags causing the problem?  Is the file a proper geotiff file in
the first place?  In hugo (and ancient mapping package I found
somewhere), it loaded fine.  In xastir (the ham-radio tracking
package) the file loaded ok, but needed some 'streaching' to get
lat/lng to line up right.

In openev, the '0,0' position is on the map, and the coordinates
are in the hundreds of thousands, not what I would expect for
lat/long values.

Wendell

------------------------------------------

 > tiffinfo Washington_77_North.tif
TIFFReadDirectory: Warning, Washington_77_North.tif: unknown field with tag 33550 (0x830e) encountered.
TIFFReadDirectory: Warning, Washington_77_North.tif: unknown field with tag 33922 (0x8482) encountered.
TIFFReadDirectory: Warning, Washington_77_North.tif: unknown field with tag 34735 (0x87af) encountered.
TIFFReadDirectory: Warning, Washington_77_North.tif: unknown field with tag 34736 (0x87b0) encountered.
TIFFReadDirectory: Warning, Washington_77_North.tif: unknown field with tag 34737 (0x87b1) encountered.
TIFF Directory at offset 0x2b8350a
   Image Width: 11061 Image Length: 4125
   Resolution: 1, 1 (unitless)
   Bits/Sample: 8
   Sample Format: unsigned integer
   Compression Scheme: None
   Photometric Interpretation: palette color (RGB from colormap)
   Orientation: row 0 top, col 0 lhs
   Samples/Pixel: 1
   Rows/Strip: 1
   Planar Configuration: single image plane
   Color Map: (present)
   Software: IMAGINE TIFF Support
Copyright 1991 - 1999 by ERDAS, Inc. All Rights Reserved
@(#)$RCSfile: etif.c $ $Revision: 1.9.1.2 $ $Date: 2001/12/05 00:33:12Z $
   Tag 33550: 63.712169,63.712169,0.000000
   Tag 33922: 0.000000,0.000000,0.000000,-378189.279676,241388.855341,0.000000
   Tag 34735: 
1,1,0,16,1024,0,1,1,1025,0,1,1,1026,34737,235,192,2048,0,1,4269,3072,0,1,32767,3073,34737,192,0,3074,0,1,32767,3075,0,1,8,3076,0,1,9001,3078,34736,1,0,3079,34736,1,1,3080,34736,1,2,3084,34736,1,3,3085,34736,1,4,3086,34736,1,5,3087,34736,1,6
   Tag 34736: 38.666667,33.333333,-75.500000,0.000000,38.108333,0.000000,0.000000
   Tag 34737: IMAGINE GeoTIFF Support
Copyright 1991 - 2001 by ERDAS, Inc. All Rights Reserved
@(#)$RCSfile: egtf.c $ $Revision: 1.9.2.4 $ $Date: 2002/01/24 16:43:13Z $
Projection = Lambert Conformal Conic|IMAGINE GeoTIFF Support
Copyright 1991 - 2001 by ERDAS, Inc. All Rights Reserved
@(#)$RCSfile: egtf.c $ $Revision: 1.9.2.4 $ $Date: 2002/01/24 16:43:13Z $
Projection Name = Lambert Conformal Conic
Units = meters
GeoTIFF Units = meters|