Re: [postgis-users] New algorithms on the spheroid: intersecting lines and minimum distance point-line. Current software error assesment.

2021-08-01 Thread Дорофей Пролесковский
Hi, Fundamental issue is that the world is 4D and geodetic computation is 2D. You can get a result that's nice mathematically, but the idea of "carry out the calculations in full on the ellipsoid and thus be able to forget about the projected CRS, and leave them purely for aesthetic purposes"

Re: [postgis-users] New algorithms on the spheroid: intersecting lines and minimum distance point-line. Current software error assesment.

2021-08-01 Thread José
Jose Carlos,Buena respuesta. Tienes toda la razón. Un abrazo. Jose Enviado desde mi iPhone > El 31 jul 2021, a las 18:53, José Carlos Martínez > escribió: > >  > Hi, > > I was not expecting that answer and less to hear about calculations on the > sphere when we are talking about geodesy!.

Re: [postgis-users] New algorithms on the spheroid: intersecting lines and minimum distance point-line. Current software error assesment.

2021-07-31 Thread José Carlos Martínez
Hi, I was not expecting that answer and less to hear about calculations on the sphere when we are talking about geodesy!. The comparison between the spheroidal (local sphere) and spherical intersection has already been made in the article. We did it because some software uses this approach.

Re: [postgis-users] New algorithms on the spheroid: intersecting lines and minimum distance point-line. Current software error assesment.

2021-07-28 Thread Paul Ramsey
This is very interesting, but from a practical point of view the problems around doing intersections on the spheroid are not to do with the difficulty of calculating spheroidal intersection points, but the difficulty in programming things that are relatively simple in cartesian (R2) space in

[postgis-users] New algorithms on the spheroid: intersecting lines and minimum distance point-line. Current software error assesment.

2021-07-27 Thread José Carlos Martínez
Hi list, I want to share our last research about gemetric operations on the spheroid [1] Considering two segments defined by 2 points each one over the spheroid. We want to get the intersection point defined by these two segments. Several points to note: 1.- We could not find any software