From 916d93a65410b6fd1dd005789e3c68cacc8fadda Mon Sep 17 00:00:00 2001 From: Wetitpig Date: Sat, 5 Sep 2020 12:09:42 +0800 Subject: [PATCH] Add reference --- README.md | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/README.md b/README.md index 224c22f..4eef2c4 100644 --- a/README.md +++ b/README.md @@ -25,7 +25,7 @@ geodesic [-i file] [-o file] [-k precision] [-p problem] [-f projection] [-s] [- `-f [sphere|ellipsoid|block]` Select projection for evaluating the azimuths and distances. * Sphere projection employs the haversine algorithm and spherical triangle formula. Error is higher (error ~0.5%). * Ellipsoid projection employs the Vincenty's algorithm with modifications by Charles Karney. It is more resource-intensive (2x sphere projection). -* Block projection means following parallels of latitude and meridians of longitude. For meridian arcs Bessel's series is implemented. All inputted coordinates should follow meridians of longitude and parallels of latitude. +* Block projection means following parallels of latitude and meridians of longitude, assuming the Earth is an ellipsoid. For meridian arcs Bessel's series is implemented. All inputted coordinates should follow meridians of longitude and parallels of latitude. `-s` Different computations for different problems. * Distance between coordinates for inverse problems. @@ -159,3 +159,4 @@ Where 4. [Determination of areas on the plane, sphere and ellipsoid](https://www.tandfonline.com/doi/abs/10.1179/sre.2006.38.301.583?journalCode=ysre20) 5. [Geodesics on an ellipsoid of revolution](https://arxiv.org/pdf/1102.1215.pdf) 6. [Meridian arc @ Wikipedia](https://en.wikipedia.org/wiki/Meridian_arc) +7. [Longitude @ Wikipedia](https://en.wikipedia.org/wiki/Longitude#Length_of_a_degree_of_longitude)