## Re: [PanoTools-devel] [hugin-ptx] Re: Lambert projection

 Re: [PanoTools-devel] [hugin-ptx] Re: Lambert projection From: Daniel M. German - 2006-12-12 17:36:20 ```Since last night I have been struggling to get the Lambert Azimuthal to work. I have been beaten by numerical analysis problems (or numerical paralysis as my colleague that teaches it here at Uvic calls it). http://turingmachine.org/~dmg/temp/lambertazith.jpg I get jagged edges and I can't compute properly its size :( I think I need to get a numerical analysis book (it was my _worst_ subject in my computer science education :) but I plan to teach it in the future. dmg JD Smith twisted the bytes to say: JD> On Mon, 2006-12-11 at 23:12 -0800, Daniel M. German wrote: >> >> I just committed the implementation of the lambert projection into the >> panotoos. >> >> Some technical data about it: >> >> * Its width is PI times its height >> >> * It is a projection of the sphere to a cilinder that is tangent to >> the equator. >> >> From the practical point of view it compresses the nadir and the >> zenith. >> >> It is projection type #8 in panotools. >> >> I'll post a bit more details on what its implications are to the panotoolsNG list. JD> Awesome. I had advocated adding just that projection long ago: http://www.panotools.org/mailarchive/msg/22350#msg22350 JD> There are a few others of interest too, including the Miller Equidistant JD> with 37.5deg parallel, a cylindrical equidistant projection with the JD> least scale distortion. Here's a nice page with a picture of most JD> common projections: http://www.3dsoftware.com/Cartography/USGS/MapProjections/ JD> Can PTMender take a nona .pto script without difficulty? It would be JD> nice to use nona for normal workflow to generate 16bit or multi-layer JD> TIFFs, and then modify the output type to Lambert and re-run PTMender on JD> the script to create a Lambertian preview image. JD> JD JD> --~--~---------~--~----~------------~-------~--~----~ JD> You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. JD> A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ JD> To post to this group, send email to hugin-ptx@... JD> To unsubscribe from this group, send email to hugin-ptx-unsubscribe@... JD> For more options, visit this group at http://groups.google.com/group/hugin-ptx JD> -~----------~----~----~----~------~----~------~--~--- -- Daniel M. German "If I were stuck on a desert island with only one compiler Brian Kernighan -> I'd want a C compiler" http://turingmachine.org/ http://silvernegative.com/ dmg (at) uvic (dot) ca replace (at) with @ and (dot) with . ```

 [PanoTools-devel] Lambert projection From: dmg - 2006-12-12 07:28:02 ```I just committed the implementation of the lambert projection into the panotoos. Some technical data about it: * Its width is PI times its height * It is a projection of the sphere to a cilinder that is tangent to the equator. >From the practical point of view it compresses the nadir and the zenith. It is projection type #8 in panotools. I'll post a bit more details on what its implications are to the panotoolsNG list. -- Daniel M. German "Language alone protects us from the scariness of things with no names. Toni Morrison -> Language alone is meditation. " http://turingmachine.org/ http://silvernegative.com/ dmg (at) uvic (dot) ca replace (at) with @ and (dot) with . ```
 Re: [PanoTools-devel] [hugin-ptx] Lambert projection From: JD Smith - 2006-12-12 17:27:58 ```On Mon, 2006-12-11 at 23:12 -0800, Daniel M. German wrote: > > I just committed the implementation of the lambert projection into the > panotoos. > > Some technical data about it: > > * Its width is PI times its height > > * It is a projection of the sphere to a cilinder that is tangent to > the equator. > > From the practical point of view it compresses the nadir and the > zenith. > > It is projection type #8 in panotools. > > I'll post a bit more details on what its implications are to the panotoolsNG list. Awesome. I had advocated adding just that projection long ago: http://www.panotools.org/mailarchive/msg/22350#msg22350 There are a few others of interest too, including the Miller Equidistant with 37.5deg parallel, a cylindrical equidistant projection with the least scale distortion. Here's a nice page with a picture of most common projections: http://www.3dsoftware.com/Cartography/USGS/MapProjections/ Can PTMender take a nona .pto script without difficulty? It would be nice to use nona for normal workflow to generate 16bit or multi-layer TIFFs, and then modify the output type to Lambert and re-run PTMender on the script to create a Lambertian preview image. JD ```
 Re: [PanoTools-devel] [hugin-ptx] Re: Lambert projection From: Daniel M. German - 2006-12-12 17:36:20 ```Since last night I have been struggling to get the Lambert Azimuthal to work. I have been beaten by numerical analysis problems (or numerical paralysis as my colleague that teaches it here at Uvic calls it). http://turingmachine.org/~dmg/temp/lambertazith.jpg I get jagged edges and I can't compute properly its size :( I think I need to get a numerical analysis book (it was my _worst_ subject in my computer science education :) but I plan to teach it in the future. dmg JD Smith twisted the bytes to say: JD> On Mon, 2006-12-11 at 23:12 -0800, Daniel M. German wrote: >> >> I just committed the implementation of the lambert projection into the >> panotoos. >> >> Some technical data about it: >> >> * Its width is PI times its height >> >> * It is a projection of the sphere to a cilinder that is tangent to >> the equator. >> >> From the practical point of view it compresses the nadir and the >> zenith. >> >> It is projection type #8 in panotools. >> >> I'll post a bit more details on what its implications are to the panotoolsNG list. JD> Awesome. I had advocated adding just that projection long ago: http://www.panotools.org/mailarchive/msg/22350#msg22350 JD> There are a few others of interest too, including the Miller Equidistant JD> with 37.5deg parallel, a cylindrical equidistant projection with the JD> least scale distortion. Here's a nice page with a picture of most JD> common projections: http://www.3dsoftware.com/Cartography/USGS/MapProjections/ JD> Can PTMender take a nona .pto script without difficulty? It would be JD> nice to use nona for normal workflow to generate 16bit or multi-layer JD> TIFFs, and then modify the output type to Lambert and re-run PTMender on JD> the script to create a Lambertian preview image. JD> JD JD> --~--~---------~--~----~------------~-------~--~----~ JD> You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. JD> A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ JD> To post to this group, send email to hugin-ptx@... JD> To unsubscribe from this group, send email to hugin-ptx-unsubscribe@... JD> For more options, visit this group at http://groups.google.com/group/hugin-ptx JD> -~----------~----~----~----~------~----~------~--~--- -- Daniel M. German "If I were stuck on a desert island with only one compiler Brian Kernighan -> I'd want a C compiler" http://turingmachine.org/ http://silvernegative.com/ dmg (at) uvic (dot) ca replace (at) with @ and (dot) with . ```
 Re: [PanoTools-devel] [hugin-ptx] Re: Lambert projection From: Daniel M. German - 2006-12-12 17:37:19 ``` JD> Can PTMender take a nona .pto script without difficulty? It would be JD> nice to use nona for normal workflow to generate 16bit or multi-layer JD> TIFFs, and then modify the output type to Lambert and re-run PTMender on JD> the script to create a Lambertian preview image. Not yet, but it is in the todo list. I meant ignoring several of the nona-only parameters. If anybody wants to step up the plate that would be great. dmg JD> JD JD> --~--~---------~--~----~------------~-------~--~----~ JD> You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. JD> A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ JD> To post to this group, send email to hugin-ptx@... JD> To unsubscribe from this group, send email to hugin-ptx-unsubscribe@... JD> For more options, visit this group at http://groups.google.com/group/hugin-ptx JD> -~----------~----~----~----~------~----~------~--~--- -- Daniel M. German "A machine --computer-- can only do Lady Lovelance -> what we tell it to do" http://turingmachine.org/ http://silvernegative.com/ dmg (at) uvic (dot) ca replace (at) with @ and (dot) with . ```
 Re: [PanoTools-devel] [hugin-ptx] Re: Lambert projection From: Daniel M. German - 2006-12-12 21:49:10 ``` Daniel M German twisted the bytes to say: JD> Can PTMender take a nona .pto script without difficulty? It would be JD> nice to use nona for normal workflow to generate 16bit or multi-layer JD> TIFFs, and then modify the output type to Lambert and re-run PTMender on JD> the script to create a Lambertian preview image. Daniel> Not yet, but it is in the todo list. I meant ignoring several of the Sorry, sometimes I should be more careful in my typing: "It means ignoring several of the nona-only parameters. dmg Daniel> nona-only parameters. If anybody wants to step up the plate that would Daniel> be great. -- Daniel M. German "Programming is like sex --one mistake and you'll have to support it for Anonymous -> the rest of your life." http://turingmachine.org/ http://silvernegative.com/ dmg (at) uvic (dot) ca replace (at) with @ and (dot) with . ```
 Re: [PanoTools-devel] [hugin-ptx] Re: Lambert projection From: Daniel M. German - 2006-12-13 05:52:37 ``` JD> Awesome. I had advocated adding just that projection long ago: http://www.panotools.org/mailarchive/msg/22350#msg22350 I looked at the others you mentioned. Miller. I don't think it is very useful. Its poles are too stretched for my taste Orthographic. Perhaps, but it is restricted to 180x180 Of interest would be to be able to parametrize the projections with an standard parallel (such as the Behrmann cylindrical which is a variation of the lambert). I do like the Berhmann The one that I'd like to implement is the quincuncial, but I have not been able to find its math (even the original paper that presents is cryptic--for a non geographer). -- Daniel M. German "C is brutal and raw, Anonymous -> therefore low level and powerful." http://turingmachine.org/ http://silvernegative.com/ dmg (at) uvic (dot) ca replace (at) with @ and (dot) with . ```
 Re: [PanoTools-devel] [hugin-ptx] Re: Lambert projection From: Sebastien Perez-Duarte - 2006-12-13 08:04:20 ```On 12/13/06, Daniel M. German wrote: > > The one that I'd like to implement is the quincuncial, but I have not > been able to find its math (even the original paper that presents is > cryptic--for a non geographer). I second the request for the quincucial transformation http://www.progonos.com/furuti/MapProj/Normal/ProjConf/projConf.html http://en.wikipedia.org/wiki/Quincuncial_map Here are some formulas http://groups.google.com/group/comp.graphics.apps.gimp/browse_thread/thread/bd0179dcf164d078/821afe9833a9039e Seb ```