[Mapserver-users] ArcMap and Geo-referenced TIFF file problem

[Dylan Keon]

All good suggestions from Mike.  I think it might be his third 
suggestion - that ArcMap is just exporting the view extent as an image. 
  If that's the case you can use ArcToolbox to generate your GeoTIFF, as 
Mike suggested, or you can use GRIDIMAGE from command line ArcInfo 
Workstation (assuming you're working with a grid).  That's what I would try.

--Dylan


On 07/14/2004 09:16 AM, Davis Michael A DPW GIS TECH wrote:
> I am not sure why you are having problems with the GeoTIFF, here are a 
> couple of things to check:
> 
> -Are you checking the box to create a world file under options in the 
> export dialog?
> 
> -Are you exporting from "Map" view or "Layout" view?  If you are in 
> Layout mode you might be exporting a GeoTIFF of an 8.5x11 sheet of paper.
> 
> -Arc map will export whatever is in the view extent.  If you need to 
> convert the whole image to GeoTIFF you are better off using ArcToolbox 
> or ERDAS Imagine.
> 
> -What is your source data? Is is another image format, or is it map data? 
> 
> If you cant figure it out, you might try converting your imagery to ECW 
> with the free compressor here:
> 
> http://www.ermapper.com/downloads/
> 
> I have had great success with ECW imagery on low compression settings.
>  
> 
> Mike Davis
> GIS Analyst
> Fort Richardson, AK
> 
> 
> -----Original Message-----
> From: P Wilkerson [mailto:1wilkerson at charter.net]
> Sent: Wednesday, July 14, 2004 7:30 AM
> To: mapserver-users at lists.gis.umn.edu
> Subject: [Mapserver-users] ArcMap and Geo-referenced TIFF file problem
> 
> I am nearing a critical deadline and I am really stumped and need help.
> 
> I cannot generate a georeferenced  TIFF using ArcMap that works within
> Mapserver  The resolution is either too low or only a section of the map is
> exported.
> 
> Help!
> 
> Peter
> 
> 
> ==============
> 
> BACKGROUND INFORMATION
> 
> The group I am working with is trying to get a geo-referenced TIFF image
> file exported from ArcMap so it can be used by Mapserver.   The problem is
> that we can export a low-resolution map that is a working geo-referenced
> TIFF but when we go to export the same map at, say, 300 dpi one of two
> things happen:
> 
>     1) We only get an output of a part of the map that we can see on our
> monitor screen rather than the whole map.   The resulting map also has its
> colors changed to some unexpected colors, or...
> 
>     2) We get a high-resolution TIFF file that has lost its 
> geo-referencing.
> 
> -----------------
> 
>     I tried the Geotiffe utility without success to set the values for the
> high-resolution, non-georeferenced TIFF (scenario #2 above).
> 
> -----------------------
> 
> Below is a copy of a portion of my map file.   The boston1844 layer works
> fine.  I cannot generate a georef TIFF that works for the  a1874 layer.
> 
> MAP
>   NAME bostonstreets
>   SIZE 600 450
>   IMAGECOLOR 195 195 195
> # Extent below is for Ortho map which covers a wider area than the 1874a 
> map
>   EXTENT  232128.515      897273.863                     239515.676
> 903627.798
>   UNITS meters
> # IMAGETYPE PNG
>   SHAPEPATH "/usr/local/www/htdocs/pwilkerson.decimaldegrees.com/data/"
>   SYMBOLSET
> "/usr/local/www/htdocs/pwilkerson.decimaldegrees.com/data/etc/symbols.sym"
>   FONTSET
> "/usr/local/www/htdocs/pwilkerson.decimaldegrees.com/data/etc/fonts.txt"
> 
> WEB
>   IMAGEPATH "/usr/local/www/htdocs/pwilkerson.decimaldegrees.com/tmp/"
>   IMAGEURL "/tmp/"
>   MAXSCALE 44956.225339
>   MINSCALE 1100.000
> END
> 
> REFERENCE
>    IMAGE
> "/usr/local/www/htdocs/pwilkerson.decimaldegrees.com/data/keymap/2001keymap. 
> 
> gif"
> # Extent below is for Ortho map which covers a wider area than the 1874a 
> map
>   EXTENT  232128.515      897273.863                     239515.676
> 903627.798
>    STATUS ON
>   COLOR -1 -1 -1
>   OUTLINECOLOR 255 0 0
>  SIZE 200 150
> END
> 
> 
> #-------------------------------------
> 
> LAYER
>      NAME "boston1844"
>      STATUS Off
>      TYPE RASTER
>      DATA
> "/usr/local/www/htdocs/pwilkerson.decimaldegrees.com/data/m1844/dickinson_18 
> 
> 44.tiff"
> END # Layer for Boston 1844 map
> 
> LAYER
>      NAME "a1874"
>      STATUS ON
>      TYPE RASTER
>      DATA
> "/usr/local/www/htdocs/pwilkerson.decimaldegrees.com/data/a1874/1874_index.t 
> 
> if"
> END # Layer for Boston 1874 map
> 
> ....
> 
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