On Wednesday 12 Nov 2003 1:22 am, David Megginson wrote:
> There are raw, scanned sectionals and terminal charts available
> online. I haven't downloaded and unpacked the zipfiles yet, so I'm
> not sure of the format.
>
> Sectionals, at 1:500,000 scale, are the most commonly-used charts for
> VFR flying -- in Canada, we have the same thing, but call them VNC's
> (Visual Navigation Charts). For busy terminal areas, there are also
> special 1:250,000 scale charts available. The other popular charts
> are the World Aeronautical Charts (WAC), at 1:1,000,000 -- it's harder
> to make out small details, but there's less chart folding and
> switching for a long flight.
>
> Here are the U.S. 1:500,000 Sectionals and 1:250,000 terminal charts,
> in TIFF format:
>
> http://aviationtoolbox.org/raw_data/FAA_sectionals/East/
>
> Here's the 1:250,000 chart for the SFO area:
>
>
> http://aviationtoolbox.org/raw_data/FAA_sectionals/West/Terminal-Area-Chart
>s/San%20Francisco%20TAC%2063.tif
>
> I'm just downloading now, so I'm not sure about the quality yet.
>
>
Wow, these are big, beautiful, 8-bit-colo[u]r scans, sure enough. I notice
that they have geoTIFF tags. My brief reading and hazy understanding of the
geoTIFF specification at
http://remotesensing.org/geotiff/spec/geotiffhome.html
leads me to believe that there is useful information in there which allows one
to translate between the raw raster image coordinates and what the spec.
refers to as Model space, i.e. geodetic coordinates.
Frustratingly, I can't get the geotiff packages to install. I have installed
libproj0-4.4.5-2mdk.i586.rpm, libgeotiff1-1.1.4-6mdk.i586.rpm and
libgeotiff1-devel-1.1.4-6mdk.i586.rpm. But...
[EMAIL PROTECTED] rpms]# rpm -ivh geotiff-1.1.4-6mdk.i586.rpm
error: failed dependencies:
libgeotiff.so is needed by geotiff-1.1.4-6mdk
I don't really understand why this is a problem, because the libraries seem to
be installed OK (the indirect symbolic linking seems odd, but valid)
[EMAIL PROTECTED] rpms]# ls -l /usr/lib/libgeo* /usr/lib/geo*
## listing edited to reduce line length ##
/usr/lib/libgeotiff.so -> geotiff.so.1.1.4*
/usr/lib/geotiff.so.1.1.4 -> /usr/lib/libgeotiff.so.1.1.4*
1789726 Jan 30 2003 /usr/lib/libgeotiff.a*
1633716 Jan 30 2003 /usr/lib/libgeotiff.so.1.1.4*
...and ldconfig knows about them...
[EMAIL PROTECTED] rpms]# ldconfig -p | grep geo
libgeotiff.so.1.1.4 (libc6) => /usr/lib/libgeotiff.so.1.1.4
libgeotiff.so (libc6) => /usr/lib/libgeotiff.so
Anyone know how to unstick this? geotiff gives us a tool to read the tags in
the TIFF files.
Regards
Jonathan
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