Re: [Flightgear-devel] Scanned sectional charts online
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 ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] Scanned sectional charts online
Try using the ignore dependencies flag on RPM to override the dependency checking. Ugly, but it might work. Alternatively, start from source and built it yourself. Richard you wrote 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. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Scanned sectional charts online
On Wednesday 12 Nov 2003 12:10 pm, Jonathan Richards wrote: Frustratingly, I can't get the geotiff packages to install. snip Anyone know how to unstick this? geotiff gives us a tool to read the tags in the TIFF files. Sorry to follow up my own post. I gave up on the rpm packages and tried to install from source. Segmentation fault! So I took the binary package from ftp://ftp.remotesensing.org/pub/geotiff/libgeotiff/libgeotiff-linux-bin.1.1.4.tar.gz and copied the files under /usr/local. There are NT and MacOS binaries there, too. listgeo gives a whole shedload of information about the mapping, too much to report here unless anyone's interested, in which case mail me. Jonathan ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Scanned sectional charts online
On Wednesday 12 November 2003 13:10, Jonathan Richards wrote: [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. You could try rpm -ivh --nodeps geotiff-1.1.4-6mdk.i586.rpm --Ivo ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Scanned sectional charts online
Jonathan Richards writes: listgeo gives a whole shedload of information about the mapping, too much to report here unless anyone's interested, in which case mail me. I'd just like to take another opportunity to express my appreciation to the U.S. government for making so much geodata available free -- without their resources and (enlightened) policies, it would be awfully hard to do any free GIS work, much less a Flight Simulator (even the international projects are often mainly U.S.-led and -funded). FlightGear users who are Americans need to remember how important this kind of free information is. Those of us who are not Americans need to press our own governments to follow suit. All the best, David ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Scanned sectional charts online
On Wednesday, 12 November 2003 16:36, David Megginson wrote: Those of us who are not Americans need to press our own governments to follow suit. Bwaahahaha! Over here that would be like the ant asking an elephant to not step on him. Even our constitution get's changed without any consultation to suite the ruling party. The USGS is unfortunately a rare example of good governance. Where I live the tax payers pay to get the government to do surveys and then the government sells us the data. :( It's a pity spatial data is so damn expensive to purchase and full of copyright restrictions. Paul ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] Scanned sectional charts online
David Megginson writes: Jonathan Richards writes: listgeo gives a whole shedload of information about the mapping, too much to report here unless anyone's interested, in which case mail me. I'd just like to take another opportunity to express my appreciation to the U.S. government for making so much geodata available free -- without their resources and (enlightened) policies, it would be awfully hard to do any free GIS work, much less a Flight Simulator (even the international projects are often mainly U.S.-led and -funded). Hear hear ! I downloaded one of the charts and yes undeed these are the real thing, to include many introduced colors due to the scanning process. I am not positive but I believe these are originally produced with either 16 or 20 distinct colors only. It is probably worth while finding out, but in any case I managed to produced a significantly smaller disk image by running an adaptive color reducer that recolored the map to use 16 colors and then remaped the white replacement color back to white This reduced the disk size to 17 megs from 40 with very little or no loss in percieved image quality. Note one should be able to get a moving map display out of these by setting up a mapserver http://mapserver.gis.umn.edu and having fgfs output a simple http request at fixed intervals. Of course Atlas could be modified too but it's probably less work to use mapserver since the geotiff support is already builtin Regardless the toughest part of getting this going should be 'collar clipping' the charts so as to get a seamless display :-) Cheers Norman ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Scanned sectional charts online
Paul Surgeon writes: The USGS is unfortunately a rare example of good governance. Where I live the tax payers pay to get the government to do surveys and then the government sells us the data. :( Ditto for Canada. Fortunately, the U.S. is making more and more data free for our countries as well. All the best, David ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] Scanned sectional charts online
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-Charts/San%20Francisco%20TAC%2063.tif I'm just downloading now, so I'm not sure about the quality yet. All the best, David ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
