{"id":419,"date":"2015-02-05T15:22:36","date_gmt":"2015-02-05T15:22:36","guid":{"rendered":"http:\/\/www.strata-smith.com\/?page_id=419"},"modified":"2015-03-19T17:40:02","modified_gmt":"2015-03-19T17:40:02","slug":"new-county-maps-projection","status":"publish","type":"page","link":"https:\/\/www.strata-smith.com\/?page_id=419","title":{"rendered":"NEW COUNTY MAPS: PROJECTION"},"content":{"rendered":"<p><a href=\"http:\/\/www.strata-smith.com\/wp-content\/uploads\/2015\/03\/website_02-52_1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-420\" src=\"http:\/\/www.strata-smith.com\/wp-content\/uploads\/2015\/03\/website_02-52_1.jpg\" alt=\"\" width=\"1406\" height=\"2145\" \/><\/a><\/p>\n<p>Internal lines of longitude and latitude do not occur on Cary\u2019s New County Maps, only a framing graticule.\u00a0 \u00a0However, the General Index Map for Cary\u2019s 1794 New Map of England and Wales and Part of Scotland does have internal longitude and latitude lines, as does the New Map of England (1811) which was sold as a summary map with the New County Maps. The red grid is in 1\u00b0longitude and latitude in a Cassini projection. When transformed, both maps show a good fit to this projection and provide indirect evidence that the New County Maps may be in a Cassini projection.<\/p>\n<p>In order to get some more information on the coordinate system used for the New County maps and their accuracy, nearly two thousand \u00a0longitude and latitude points, at an interval of 5 minutes, were \u00a0plotted from the framing graticules of all published New County maps. \u00a0The map (1) shows these points. \u00a0When the New County maps were transformed to real world coordinates (Cassini) based on georeferencing to modern towns and villages, the graticule points became distorted to a greater or lesser extent (see Map2). \u00a0The residual (RMS) error in metres, generated for each county is shown on the large coloured map. \u00a0The general trend shows the best fit to be in the central and south east England, with errors increasing to the north and to the west. The same general trend is seen in longitude and latitude plots shown in maps (A) and (B).<\/p>\n<p style=\"text-align: right;\"><a title=\"NEW COUNTY MAPS: PROJECTION TRANSFORMATION AND ERRORS\" href=\"http:\/\/www.strata-smith.com\/?page_id=422\"><em>Read More&#8230;<\/em><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Internal lines of longitude and latitude do not occur on Cary\u2019s New County Maps, only a framing graticule.\u00a0 \u00a0However, the General Index Map for Cary\u2019s 1794 New Map of England and Wales and Part of Scotland does have internal longitude &hellip; <a href=\"https:\/\/www.strata-smith.com\/?page_id=419\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-419","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.strata-smith.com\/index.php?rest_route=\/wp\/v2\/pages\/419","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strata-smith.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.strata-smith.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.strata-smith.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strata-smith.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=419"}],"version-history":[{"count":4,"href":"https:\/\/www.strata-smith.com\/index.php?rest_route=\/wp\/v2\/pages\/419\/revisions"}],"predecessor-version":[{"id":1334,"href":"https:\/\/www.strata-smith.com\/index.php?rest_route=\/wp\/v2\/pages\/419\/revisions\/1334"}],"wp:attachment":[{"href":"https:\/\/www.strata-smith.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=419"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}