RE: [Flightgear-devel] Georegistered imagery
Terraserver.homeadvisor.msn.com has aerial photographs of the US and Alaska down to 1m resolution (though most of it is 10yrs old, for obvious reasons). Most of the US and Alaska, at least. No, we can't get photo-scenery for Groom Lake. They get the photographs from USGS, but I can't find out if it's possible to just grab the lot. I take it that it isn't, though they also seem to have colour-infrared photographs available. I'm not sure how much a non-US national can help if anybody wants the data. Giles Robertson [EMAIL PROTECTED] [EMAIL PROTECTED] -Original Message- From: Jon Stockill [mailto:[EMAIL PROTECTED] Sent: 25 May 2004 15:31 To: FlightGear developers discussions Subject: Re: [Flightgear-devel] Georegistered imagery Corrubia, Stacie K wrote: Is it possible to bring in either raw or TIFF imagery to the flight gear environment? The imagery has been georegistered and is part of a set of stereo pair images used to create 3-D models and DEMs. Can the imagery data (as well as 3-models and high resolution DEMs (3 meter DEMs) be overlaid on an existing lower resolution dataset already in the environment? Now I've stopped drooling and repeatedly saying 3 meters! I'll reply :-) All the flightgear scenery is preprocessed using the tools available at www.terragear.org. If you're wanting to create high resolution scenery then this is where you'll need to start. There's a tutorial here: http://www.terragear.org/docs/scenery-tutorial/fg-scenery-tutorial.html That will cover the basics. The code for the positioning of photographic images is very under-developed, and not really in a usable state yet. It can be made to work reasonably effectively but imposes a very high load on the graphics subsystem as flightgear does not yet support texture paging. -- Jon Stockill [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Georegistered imagery
A good updated version of the Scenery Tutorial is here: http://glennm.orcon.net.nz/flightgear/fg-scenery-tutorial2.html Not sure why this has not been adopted on the main site. Earlier in the year I had some success with a simple method of placing photo scenery here are some results: http://freespace.virgin.net/mamaloucos.circus/Flightgearweb/index.html Pressure of work has kept me away from Flightgear for a while which is a shame so have made no further progress. Happy to explain how this was done if anyone is interested. There is no theoretical limitation to the coverage achievable by this method. Apparently the potential limitations are to do with the dynamic loading of textures and a need for a scenery LOD system. As an update I have been trying to get something in writing from coch media and getmapping to confirm the usability of the aerial imagery in the getmapping series CDs under the eula. This is what I had used to create the above scenery. There's been several emails between us, but no decision as such, have chased them again today. Mat ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Georegistered imagery
Corrubia, Stacie K wrote: Is it possible to bring in either raw or TIFF imagery to the flight gear environment? Yes, it's possible, although we don't have good facilities built in for paging high volumes of textures. This is ok if you want to do a small demo area, but you'd have problems currently doing large areas. This is something I'd like to fix some day, but it hasn't risen high enough on my todo list yet. The imagery has been georegistered and is part of a set of stereo pair images used to create 3-D models and DEMs. Can the imagery data (as well as 3-models and high resolution DEMs (3 meter DEMs) be overlaid on an existing lower resolution dataset already in the environment? You can populate the environment with custom 3d objects. You can use your own DEM data if you like and give it a higher priority than other data sources. Currently we are using SRTM 3 arcsec data for the North and South America, Europe, Asia, and Africa. Feel free to contact me on or off line if you have more specific questions. Regards, Curt. -- Curtis Olsonhttp://www.flightgear.org/~curt HumanFIRST Program http://www.humanfirst.umn.edu/ FlightGear Project http://www.flightgear.org Unique text:2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Georegistered imagery
Corrubia, Stacie K wrote: Is it possible to bring in either raw or TIFF imagery to the flight gear environment? The imagery has been georegistered and is part of a set of stereo pair images used to create 3-D models and DEMs. Can the imagery data (as well as 3-models and high resolution DEMs (3 meter DEMs) be overlaid on an existing lower resolution dataset already in the environment? Now I've stopped drooling and repeatedly saying 3 meters! I'll reply :-) All the flightgear scenery is preprocessed using the tools available at www.terragear.org. If you're wanting to create high resolution scenery then this is where you'll need to start. There's a tutorial here: http://www.terragear.org/docs/scenery-tutorial/fg-scenery-tutorial.html That will cover the basics. The code for the positioning of photographic images is very under-developed, and not really in a usable state yet. It can be made to work reasonably effectively but imposes a very high load on the graphics subsystem as flightgear does not yet support texture paging. -- Jon Stockill [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] Georegistered imagery
Thank you for the quick reply! Is a circle with a 4.5mi radius small enough to model without bogging down the system? We have a NVIDIA Quadro FX 1000 video graphics card. So I should be able to bring in my high resolution imagery and be able to orient it and place it at the correct Lat/Lon? Great! The scenery tutorial seemed to cover DEMs and vector maps but not imagery files and their placement. Are they handled in the same way? The GIS software I have available is pretty flexible in terms of output formats so I hope to create georegistered products directly compatible with the Flight Gear environment. On another note is there a way to maintain object annotations (i.e. oak tree, brick building, concrete road, etc) within the system? Stacie -Original Message- From: Curtis L. Olson [mailto:[EMAIL PROTECTED] Sent: Tuesday, May 25, 2004 9:23 AM To: FlightGear developers discussions Subject: Re: [Flightgear-devel] Georegistered imagery Corrubia, Stacie K wrote: Is it possible to bring in either raw or TIFF imagery to the flight gear environment? Yes, it's possible, although we don't have good facilities built in for paging high volumes of textures. This is ok if you want to do a small demo area, but you'd have problems currently doing large areas. This is something I'd like to fix some day, but it hasn't risen high enough on my todo list yet. The imagery has been georegistered and is part of a set of stereo pair images used to create 3-D models and DEMs. Can the imagery data (as well as 3-models and high resolution DEMs (3 meter DEMs) be overlaid on an existing lower resolution dataset already in the environment? You can populate the environment with custom 3d objects. You can use your own DEM data if you like and give it a higher priority than other data sources. Currently we are using SRTM 3 arcsec data for the North and South America, Europe, Asia, and Africa. Feel free to contact me on or off line if you have more specific questions. Regards, Curt. -- Curtis Olsonhttp://www.flightgear.org/~curt HumanFIRST Program http://www.humanfirst.umn.edu/ FlightGear Project http://www.flightgear.org Unique text:2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Georegistered imagery
Corrubia, Stacie K wrote: Thank you for the quick reply! Is a circle with a 4.5mi radius small enough to model without bogging down the system? We have a NVIDIA Quadro FX 1000 video graphics card. The answer to this really depends on your texture / dem resolution. So I should be able to bring in my high resolution imagery and be able to orient it and place it at the correct Lat/Lon? Great! There is a tool in the terragear suite called photo which can be used to cut a photo or texture into the scenery. In the same subdirectory there is a perl script called chop.pl which can chop larger textures down into sub pieces that are within a card's maximum texture size (probably on the order of 4096x4096 for your card.) The scenery tutorial seemed to cover DEMs and vector maps but not imagery files and their placement. Are they handled in the same way? It's similar. The basic ideas is that you run the various prep tools to chop up and place the data in the correct intermediate format. The you run the fgfs-construct utility to assemble all the pieces of a particular tile. There are also some wrapper scripts for leveraging multiple machines to build a lot of tiles quickly. The GIS software I have available is pretty flexible in terms of output formats so I hope to create georegistered products directly compatible with the Flight Gear environment. On another note is there a way to maintain object annotations (i.e. oak tree, brick building, concrete road, etc) within the system? Our scene graph allows you to name any sub branch. Most of the 3d object loaders preserve any of these labels that are stored in the 3d file. That may or may not be helpful depending on what you want to do with these labels at run time. Regards, Curt. -- Curtis Olsonhttp://www.flightgear.org/~curt HumanFIRST Program http://www.humanfirst.umn.edu/ FlightGear Project http://www.flightgear.org Unique text:2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
