RE: MI-L MrSID error "Image control points cannot be in a straight line"

[Lawson Key]

Thanks everyone.  I was not at the proper zoom to view the image.  I wondered what the 
purple check was all about.

-----Original Message-----
From: Jay C Russell [mailto:[EMAIL PROTECTED]
Sent: Friday, April 02, 2004 2:51 PM
To: Lawson Key
Subject: Re: MI-L MrSID error "Image control points cannot be in a
straight line"



When you register the image choose Univeral Transverse Mercator (NAD 83).

I believe the reason you don't see the image can be solved by going to
layer control and removing any zoom display control
by selecting the image layer in the list, hitting the display button, and
unchecking the "Display within zoom range".

Jay Russell




                                                                                       
                                
                    "Lawson Key"                                                       
                                
                    <[EMAIL PROTECTED]        To:     <[EMAIL PROTECTED]>              
                 
                    ryTel.com>               cc:                                       
                                
                                             Subject:     MI-L MrSID error "Image 
control points cannot be in a        
                    04/02/04 02:37 PM        straight line"                            
                                
                                                                                       
                                
                                                                                       
                                




Hi,

I'm new to MrSID and raster imaging.  I have an ortho quad, which appears
to be registered, but I'm not real sure.  When I open the file, I am
prompted to choose a projection, but am unsure of exactly what to choose
(see below).  When I select the Lat/Lon category, and any category member,
I get the error message "Image control points cannot be in a straight
line".  When I select any UTM projection, I don't get an error message, but
I don't see the blasted thing on my map!  Even when I open a new map window
for the image, i see nothing.

Any help opening this is greatly appreciated.  If anyone can direct me
toward a good resource for understanding geo-projections, I'd appreciate
that too.

Am running MI 6.5.  Some of the reference information that came with the
file is below:

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 15
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -93.000000
Latitude_of_Projection_Origin: +00.000000
False_Easting: 500000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257

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