extent is invalid for geotiff

[John Bonk]

Ed,

Thank you again for responding to my question.

I'm still having problems understanding extent.

When I serve up my geotiff with your extent using

MAP
   IMAGETYPE PNG
   EXTENT -13053641.3 3358256.867 -932579.471 5752577.812

   SIZE 400 300
   SHAPEPATH "data"

   LAYER # MODIS raster layer begins here
     NAME modis
     DATA RGB_mosaic_250m.tif
     STATUS DEFAULT
     TYPE RASTER
   END # MODIS raster layer ends here

END # end of map file

I end up with an image that is smaller than I would expect, and offset
vertically.

If I add an html template to the above and serve the geotiff in the browse
mode, the image in the geotiff occupies a very small area in the png that
is produced.  The geotiff image is left justified and centered vertically
in the png.

Can anyone explain why this is?  How can I get the geotiff image to fill
the entire png?

John



At 09:41 2005-02-08 -0500, Ed McNierney wrote:
>John -
>
>No, there isn't any preferred method.  A GeoTIFF will hold projection,
>datum, and bounding box information in a way that can be read by
>MapServer.  As long as the GeoTIFF is created properly (i.e. you can't
>leave out the projection) the coordinate formats used don't matter.
>
>         - Ed
>
>Ed McNierney
>President and Chief Mapmaker
>TopoZone.com / Maps a la carte, Inc.
>73 Princeton Street, Suite 305
>North Chelmsford, MA  01863
>ed at topozone.com
>(978) 251-4242
>
>-----Original Message-----
>From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
>Behalf Of John Bonk
>Sent: Monday, February 07, 2005 11:39 AM
>To: MAPSERVER-USERS at LISTS.UMN.EDU
>Subject: Re: [UMN_MAPSERVER-USERS] extent is invalid for geotiff
>
>Ed,
>
>Thank you, that worked.  I seems obvious now when I look back at the
>documentation.
>
>Perhaps someone can answer another question.  In creating geotiffs, is
>there a preferred way of specify coordinates (degrees, UTM, etc)  so
>that the image will work well with MapServer?
>
>Thanks again for the response,
>John
>At 23:10 2005-02-04 -0500, Ed McNierney wrote:
> >John -
> >
> >If that's the only data layer in your map, ignore PROJECTION
> >completely, at least for now.
> >
> >Have you tried an EXTENT of:
> >
> >EXTENT -13053641.3 3358256.867 -932579.471 5752577.812
> >
> >         - Ed
> >
> >Ed McNierney
> >TopoZone.com
> >
> >-----Original Message-----
> >From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU]
> >On Behalf Of John Bonk
> >Sent: Friday, February 04, 2005 5:08 PM
> >To: MAPSERVER-USERS at LISTS.UMN.EDU
> >Subject: [UMN_MAPSERVER-USERS] extent is invalid for geotiff
> >
> >I am very new at this.  I am having problems serving a geotiff image
> >with the following attributes:
> >
> >Projection Method: CT_Equirectangular
> >     ProjCenterLatGeoKey: 0.000000 (  0d 0' 0.00"N)
> >     ProjCenterLongGeoKey: 0.000000 (  0d 0' 0.00"E)
> >     ProjFalseEastingGeoKey: 0.000000 m
> >     ProjFalseNorthingGeoKey: 0.000000 m
> >
> >Corner Coordinates:
> >Upper Left    (-13053641.300,5752577.812)
> >Lower Left    (-13053641.300,3358256.867)
> >Upper Right   (-9325729.471,5752577.812)
> >Lower Right   (-9325729.471,3358256.867)
> >Center        (-11189685.386,4555417.340)
> >
> >I have tried all sorts of variation of these number in the EXTENT field
>
> >but  I have been getting an 'extent is invalid' message.
> >
> >Can anyone help me express the EXTENT and PROJECTION to read this file?
> >
> >John
> >=======================================
> >

=======================================
John Bonk
SSAI/NASA GES DISC
Phone:(301) 614-5280
Fax:  (301) 614-5268
For more information about
the NASA GES DISC and its services:
http://daac.gsfc.nasa.gov/