none 10.14358/PERS.85.7.475 American Society for Photogrammetry and Remote Sensing American Society for Photogrammetry and Remote Sensing 5468 107971237 229722 202110140442460000 10.14358 2021-10-14T00:44:09Z 2019-06-28T00:32:38Z 1 Photogrammetric Engineering & Remote Sensing photogramm eng remote sensing 0099-1112 07 01 2019 85 7 Clifford J. Mugnier The Grids & Datums column has completed an exploration of every country on the Earth. For those who did not get to enjoy this world tour the first time, PE&RS is reprinting prior articles from the column. This month's article on the Democratic and Popular Republic of Algeria was originally printed in 2001 but contains updates to their coordinate system since then. 07 01 2019 475 478 0099-1112(20190701)85:7L.475;1- 10.14358/PERS.85.7.475 https://www.ingentaconnect.com/content/10.14358/PERS.85.7.475 https://www.ingentaconnect.com/content/asprs/pers/2019/00000085/00000007/art00008 https://www.ingentaconnect.com/content/asprs/pers/2019/00000085/00000007/art00008