{"id":1407,"date":"2014-02-06T11:40:17","date_gmt":"2014-02-06T11:40:17","guid":{"rendered":"http:\/\/www.geoplanit.co.uk\/?p=1407"},"modified":"2014-02-07T18:14:07","modified_gmt":"2014-02-07T18:14:07","slug":"one-of-our-bridges-is-missing-mapping-discrepancies","status":"publish","type":"post","link":"https:\/\/www.geoplanit.co.uk\/?p=1407","title":{"rendered":"One of our Bridges is Missing! Mapping Discrepancies (update: no it isn’t)"},"content":{"rendered":"
\"One_of_our_BRIDGES_is_missing_movie_poster\"<\/a>
Yes, I did spend sometime in Photoshop doing that… quite proud of the bridge…<\/figcaption><\/figure>\n

UPDATE 07\/02\/2014 : \u00a0Read the associated comment on this post from Phil at the Ordnance\u00a0Survey<\/a>, quite\u00a0possibly\u00a0the best response I’ve ever had on this blog, thank you.<\/strong><\/p>\n

UPDATE 07\/02\/2014 2:\u00a0<\/strong>Old Maps at end of this post courtesy of ‘Phil Allen’ FSE Manager at the Ordnance Survey, thank you!<\/strong><\/p>\n

Working with real\u00a03D models of London<\/a> it sometimes makes sense to place this in context on a boundary map, but I’ve run into to something that’s given me pause for thought….<\/p>\n

The City of London is an odd and special part of London I think you’ll agree<\/a>, I’ve always known it’s administrative boundary as being a little odd (something about bridges…) sure enough on the City of London website there is the boundary showing clearing two bridges are covered in its area.<\/p>\n

\"city_of_london_boundary\"<\/a><\/p>\n

Now being a GIS sort of fellow I want to download this boundary set, so visiting the OS OpenData site<\/a>, I see that something’s up whilst one bridge is clearly there on the left, London Bridge has been excluded (hence my clever title). \u00a0 What does it all mean? \u00a0 Well I think probably OS Opendata is generalised in some way and this bit got missed… but I don’t really know. \u00a0 Downloading boundary data from the Greater London Authority data site doesn’t fix things either (it is just the data set the OS gives)<\/a>.<\/p>\n

\"cc3d_london_terrain3_londonbridge\"<\/a>
The 3D London Bridge is from Trimble Warehouse (click on image for more 3D London)<\/figcaption><\/figure>\n

So what does this all mean? \u00a0Well it means that the OS may well be the<\/strong>\u00a0‘authoritative geographic data’ set for the UK, but it doesn’t mean everything you get from it is without ‘issues’. \u00a0 Know your data, know its limitations<\/strong>, also did I mention OpenStreetMap<\/a> seems to get it right? \u00a0Why am I relying on data from the OS again?<\/p>\n

\"city_of_london_boundary_OSM\"<\/a>
OpenStreetMap better than some give it credit for… (actually maybe not, see comments<\/strong>)<\/figcaption><\/figure>\n

UPDATE 07\/02\/2014 1: \u00a0Read the associated comment on this post from Phil at the\u00a0Ordnance\u00a0Survey<\/a>, quite\u00a0possibly\u00a0the best response I’ve ever had on this blog, thank you.<\/strong><\/p>\n

UPDATE 07\/02\/2014 2:\u00a0<\/strong>Old Maps below courtesy of ‘Phil Allen’ FSE Manager at the Ordnance Survey, thank you!<\/strong><\/p>\n

\"image001\"<\/a>
1875<\/figcaption><\/figure>\n
\"image002\"<\/a>
1916<\/figcaption><\/figure>\n
\"image003\"<\/a>
1953<\/figcaption><\/figure>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

UPDATE 07\/02\/2014 : \u00a0Read the associated comment on this post from Phil at the Ordnance\u00a0Survey, quite\u00a0possibly\u00a0the best response I’ve ever had on this blog, thank you. UPDATE 07\/02\/2014 2:\u00a0Old Maps at end of this post courtesy of ‘Phil Allen’ FSE Manager at the Ordnance Survey, thank you! Working with real\u00a03D models of London it sometimes […]<\/p>\n","protected":false},"author":161,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[93,7,140,164,83,25,240],"tags":[],"class_list":{"0":"post-1407","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-3d","7":"category-gis","8":"category-opendata","9":"category-openstreetmap","10":"category-ordnance-survey","11":"category-planning","12":"category-realurban3d"},"_links":{"self":[{"href":"https:\/\/www.geoplanit.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1407","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.geoplanit.co.uk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.geoplanit.co.uk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.geoplanit.co.uk\/index.php?rest_route=\/wp\/v2\/users\/161"}],"replies":[{"embeddable":true,"href":"https:\/\/www.geoplanit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1407"}],"version-history":[{"count":9,"href":"https:\/\/www.geoplanit.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1407\/revisions"}],"predecessor-version":[{"id":1430,"href":"https:\/\/www.geoplanit.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/1407\/revisions\/1430"}],"wp:attachment":[{"href":"https:\/\/www.geoplanit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1407"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.geoplanit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1407"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.geoplanit.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1407"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}