Just thought I'd stick my oar in! Ordnance Survey DO NOT RECOMMEND individual software packages, being the National Mapping Agency we have to maintain a position of neutrality. The link to the OS web site provided by Tim is an area where OS' partners are able to post a statement of compatibility for their software - if you look further down the list you will see other partners advertising compatibility with MapInfo.
As to the question in hand - if a 3rd party translator was not the route you wanted to take then the best way to get all the OS MasterMap 'chunks' in a single table without duplication would be to write some MapBasic to automate the process, something like: 1) Uncompress all files (supplied by OS as gzip compressed) 2) Batch import GML files 3) Merge all tables 4) Query for duplicates (Steve's idea would work here) This process is quite manually intensive since you would need to decompress the files before being able to work with them in MapInfo. What would you do about Change Only Update? This is where the value of 3rd party software becomes apparent! Regards, -------------------------------------------------------- Colin Henderson Data Consultant Ordnance Survey Southampton, SO16 4GU Web: http://www.ordnancesurvey.co.uk Tel: ++44 (0)2380 792034 Mob: ++44 (0)7771 972307 --------------------------------------------------------- -----Original Message----- From: Tim Smith [mailto:[EMAIL PROTECTED] Sent: 24 November 2004 15:51 To: Storey, Paul Cc: [EMAIL PROTECTED] Subject: RE: MI-L Coverting multiple OS MasterMap GML 'chunks' to Tab format Paul, I'm dealing with large amounts of Mastermap data too. You can only import the files one-by-one using the converter supplied in MapInfo 7.5. You could be a masochist and do this and then create a seamless layer, but then you can't process a seamless layer table! I would be interested in anyone who may have written a MapBasic program to automate this. I tried MapGML (see http://www.mapsbydesign.co.uk/mastermap.html) This works well and can converts straight from the .gz files. You can change the convertion script to split the layers how you want. There is a demo version available on the site. Ordnance Survey recommend MapGML for MapInfo... http://www.ordnancesurvey.co.uk/oswebsite/products/osmastermap/systems/ Keep me updated with what you find & I'll do likewise. Cheers Tim -----Original Message----- From: Storey, Paul [mailto:[EMAIL PROTECTED] Sent: 24 November 2004 14:18 To: [EMAIL PROTECTED] Subject: MI-L Coverting multiple OS MasterMap GML 'chunks' to Tab format I am using MapInfo Pro 7.5 and am looking to create a OS MasterMap datasets in Tab format. I have requested the GML data from OS but this has been supplied in 5km by 5km 'chunks' (or tiles). In the past I have only imported individual GML files to Tab by using the 'Table > Import...' option, but now I have 75 GML 'chunk' files which need merging into 1 Tab file (ideally without causing overlaps/duplication). Does anyone know how MapInfo deals with multiple GML 'chunk' files? 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