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1<!--#set var="title" value="FAQ" -->
2<!--#set var="link" value="/FAQ.html" -->
3<!--#set var="shownav" value="yes" -->
4<!--#include virtual="inc/header.shtml" -->
5
6<ul>
7<li><a href="#whatIsIt">What is it?</a></li>
8<li><a href="#licence">What licence does the data have?</a></li>
9<li><a href="#junkMail">Will I get more junk mail if I enter my postcode?</a></li>
10<li><a href="#whatMaps">What maps are you using?</a></li>
11<li><a href="#doAnything">So can I do what I like with your scans/tiles?</a></li>
12<li><a href="#download">Okay; I can use the tiles for some things; can I download the complete set?</a></li>
13<li><a href="#worldFiles">It'd be really great if I could get a world file / .jpw / etc</a></li>
14<li><a href="#orthorectifying">Isn't orthowotsiting an old map hard?</a></li>
15<li><a href="#openstreetmap">Why don't you use maps created from OpenStreetMap data?</a></li>
16<li><a href="#freethepostcode">Will this data be imported back into Free the Postcode?</a></li>
17<li><a href="#accuracy">If you are using scans of old maps, how accurate will the locations be?</a></li>
18<li><a href="#houseMissing">My house isn't on a 1950s map</a></li>
19<li><a href="#pickDecade">How do I view maps from different decades?</a></li>
20<li><a href="#gps">I know exactly where I am, and what my postcode is</a></li>
21<li><a href="#islands">I can't seem to find a certain island on your overview map</a></li>
22<li><a href="#howToUse">So, how do I use it?</a></li>
23<li><a href="#code">Is the code behind the site available?</a></li>
24<li><a href="#otherdata">Here's another source of free postcodes</a></li>
25<li><a href="#codepointBusiness">Won't you drive codepoint out of business?</a></li>
26<li><a href="#tileJoins">The map doesn't join up.</a></li>
27<li><a href="#helpOrthorectifying">The wonkiness is so annoying it drives me mad, and I have experience of orthrectifying maps. Please let me straighten your maps.</a></li>
28<li><a href="#gdal">Why didn't you use proj/gdal?</a></li>
29<li><a href="#scotland">Why did it take you so long to have good mapping data of Scotland?</a></li>
30<li><a href="#northernIreland">Why don't you have mapping data of Northern Ireland?</a></li>
31<li><a href="#who">Who did the work?</a></li>
32</ul>
33
34<hr />
35
36
37<a name="whatIsIt"></a>
38<h3>What is it?</h3>
39
40<p>There are a lot of applications on websites for being able to tell where
41people are from their postcode. For example "Where is my nearest
42B&amp;Q?". <span style="text-decoration: line-through;">Unfortunately this data is expensive to licence (a few
43thousand pounds/year for a website)</span> - It's now under a quite free licence from <a href="http://www.ordnancesurvey.co.uk/oswebsite/opendata/">OS OpenData</a>. <a
44href="http://www.freethepostcode.org">Free the postcode</a> are doing a
45good job, but it is hard to contribute to their database as you
46need a GPS, so they have few postcodes.</p>
47
48<p>Our goal is to collect public domain postcode location data by getting users to locate
49themselves on a map of the country. They need only give the first part
50of their postcode, and if we can collect locations for all of these
51parts then we can create a database that is good enough for many
52applications. We are also accepting complete postcodes and 'partial'
53postcodes including the number portion of the second half of the postcode,
54in order to improve our accuracy.
55</p>
56
57
58<a name="licence"></a>
59<h3>What licence does the data have?</h3>
60
61<p>The data will be will be in the public domain; consequently, users
62submitting data agree to their submission being in the public domain
63when they enter their postcode.</p>
64
65
66<a name="junkMail"></a>
67<h3>Will I get more junk mail if I enter my postcode?</h3>
68
69<p>
70No, we are just interested in where the postcode is. We don't collect
71your name or house number. Please see our <a href="/privacy.html">privacy policy</a>.</p>
72
73
74<a name="whatMaps"></a>
75<h3>What maps are you using?</h3>
76
77<p>We have scans of out of copyright OS maps of England, Scotland and Wales.
78You can <a href="scotlandAndNI.html">register interest in future projects
79involving Northern Ireland</a>.</p>
80
81
82<a name="doAnything"></a>
83<h3>So can I do what I like with your scans/tiles?</h3>
84
85<p>
86No. The scans and tiles have been placed under a
87<a href="tileLicence.html">licence</a>; they are not in the public
88domain.
89</p>
90
91
92<a name="download"></a>
93<h3>Okay; I can use the tiles for some things; can I download the complete set?</h3>
94
95<p>
96We have all the tiles available in a couple of different naming schemes, but
97not all of them are on machines with suitable internet connections for
98downloading from.</p>
99
100<p>If you <a href="reportBug.html">drop us an email</a> letting us know which
101areas you are interested in (ideally either sheet numbers, or the whole lot),
102and confirm that your use falls within <a href="#licence">the tile
103licence</a>, we can work out the best way to let you get the tiles. It may
104even be possible for us to post you a dvd of the tiles, but we'll normally
105request a donation to <a href="http://www.openstreetmap.org/">OpenStreetMap</a>
106in-leui of the postage.
107</p>
108
109<p>One thing we do ask is that if you want to use the tiles; please don't
110try and crawl our tileserver to obtain the entire set.
111<a href="reportBug.html">Let us know</a> what you're after, and we can
112probably sort something out!
113</p>
114
115
116<a name="worldFiles"></a>
117<h3>It'd be really great if I could get a world file / .jpw / etc
118 for the tiles I'm looking at, so I can feed it to gdal / mapserv / etc</h3>
119
120<p>It's very easy to turn a tile's URL into the location of any of its
121 corners. We have a script that will happily spit out .jpw world files for
122 any of our tiles, which various people make use of.</p> 
123
124<p><a href="reportBug.html">Let us know</a> if you're interested, and we
125 can either send you a bunch of world files, or the magic perl script.</p>
126
127<p>You may also be interested in the WMS server of the tiles run by
128 <a href="http://www.blacksworld.net/">Nick Black</a>. He gives the details
129 of it in <a href="http://www.blacksworld.net/blog/?p=83">this blog post.</a>
130</p>
131
132
133<a name="orthorectifying"></a>
134<h3>Isn't orthowotsiting an old map hard?</h3>
135
136<p>Luckily we're going to work in the OSGB coordinate system that
137matches up with the grid lines on the map; this means we don't have to
138distort the maps too much. We also are not overly fussy about the
139accuracy, so this step can be done quickly.</p>
140
141
142<a name="openstreetmap"></a>
143<h3>Why don't you use maps created from <a
144href="http://www.openstreetmap.org">OpenStreetMap</a> or <a href="http://www.ordnancesurvey.co.uk/oswebsite/opendata/">OS OpenData</a> data?</h3>
145
146<p>Because they are licensed under Creative Commons Share-alike
147licences, so we wouldn't be able to make our data public domain.</p>
148
149<p>There are people who believe that locating a point on a map creates a
150derived work, and hence requires a licence. We don't want to be the first
151to prove them wrong in a court, as that will be pricy.</p>
152
153
154<a name="freethepostcode"></a>
155<h3>Will this data be imported back into Free the Postcode?</h3>
156
157<p>Probably not directly. We are looking at the best way of presenting
158data from both projects whilst not polluting the Free the Postcode database
159with our lower accuracy data. We are importing Free the Postcode data into
160our database for display, but not re-exporting it currently.</p>
161
162
163<a name="accuracy"></a>
164<h3>If you are using scans of old maps, how accurate will the locations
165be?</h3>
166
167<p>Some of the scans are out by a degree or two but they are fairly
168good. We hope to be able to get better than 100 metres accuracy out of it in
169the end. This is more than good enough to locate a region as large as
170the first half of a postcode, and hopefully as much as the 'partial'
171postcodes described in the answer to 'What is it?' above.</p>
172
173
174<a name="houseMissing"></a>
175<h3>My house isn't on a 1950s map</h3>
176
177<p>Find some local landmarks and guess where your house is. This is
178accurate enough for our purposes.</p>
179
180
181<a name="pickDecade"></a>
182<h3>How do I view maps from different decades?</h3>
183
184<p>For many areas, we have maps from a number of different years. By default,
185 we always show you the most recent map we have. That gives you the best
186 chance to locate postcodes, and allows us to produce the best list
187 of free postcodes that we can.</p>
188
189<p>However, we do understand that sometimes people would like to be able
190 to compare how things have changed. For that reason, we provide a second
191 interface to view our maps. With this one, we allow you to browse all
192 of our maps from each decade.</p>
193
194<p>You can browse by decade by <a href="/pickDecade.html">going here</a>.
195 (We currently have maps from the 1920s, 1930s, 1940s and 1950s).
196 Please note that we do not have maps for all areas for all decades, so
197 you may find that you can only view a given place at only one or two
198 dates.</p>
199
200<p>If you have maps for an area for a decade that we currently don't,
201 please do contact us.</p>
202
203
204<a name="gps"></a>
205<h3>I know exactly where I am, and what my postcode is</h3>
206
207<p>If you have a GPS, enter your data into <a
208href="http://www.freethepostcode.org">Free the Postcode</a> and make the
209world a better place.</p>
210
211
212<a name="islands"></a>
213<h3>I can't seem to find a certain island on your overview map</h3>
214<p>We've put together a list of <a href="islands.html">hard to find
215 islands</a>, so you might well be able to find it from there.</p>
216
217
218<a name="howToUse"></a>
219<h3>So, how do I use it?</h3>
220
221<p>Find your location on our map, click where your postcode is, enter
222the postcode, agreeing to release your data.</p>
223
224
225<a name="code"></a>
226<h3>Is the code behind the site available?</h3>
227<p>Yes, the code that powers the site is available in a public
228svn repository. You're welcome to check out the code from
229<a href="https://urchin.earth.li/svn/npemap/">https://urchin.earth.li/svn/npemap/</a></p>
230<p>The code is all under an open, MIT like license, see
231<a href="https://urchin.earth.li/svn/npemap/trunk/COPYING">here</a>
232for details.</p>
233
234
235<a name="otherdata"></a>
236<h3>Here's another source of free postcodes</h3>
237
238<p>NEW: Don't worry, so do we. The OS has released some <a href="http://www.ordnancesurvey.co.uk/oswebsite/opendata/">data for free</a> - though it's not public domain, it should be free enough for most people's uses.
239
240<p style="text-decoration: line-through;">There are many unattributed postcodes sets on the web, but none others
241(apart from freethepostcode.org, which we are already working with) which
242are unambiguously free. In particular there is a <a href="http://www.jibble.org/ukpostcodes/">site</a> which lots of people have pointed at. Unfortunately
243there is no actual data there; the data was removed after the Post Office
244issued a take-down notice to this site. We're only interested in public
245domain database (or possibly databases with other unambiguously "free"
246licensing terms).
247</p>
248
249
250
251<a name="tileJoins"></a>
252<h3>The map doesn't join up.</h3>
253
254<p>Yes, it isn't perfect. The OS didn't publish a single map of the whole
255country, so you have to scan then stick together data from several maps.
256We don't really know how to correct it perfectly. It would be really cool
257if someone could write software to detect the gridlines and automatically
258cut the images up on the lines and make them square.</p> 
259
260
261<a name="helpOrthorectifying"></a>
262<h3>The wonkiness is so annoying it drives me mad, and I have experience of orthrectifying maps. Please let me straighten your maps.</h3>
263
264<p>Cool. Contact us, that would be great.</p>
265
266
267<a name="gdal"></a>
268<h3>Why didn't you use proj/gdal?</h3>
269
270<p>Because we don't know how to work them. If you feel like improving how this
271works, let us know. Update: We do use proj for the <a href="/postcodeine/">postcode display</a>.</p>
272
273
274<a name="scotland"></a>
275<h3>Why did it take you so long to have coverage of Scotland?</h3>
276
277<p>While the Ordnance Survey did create the New Popular Edition maps of
278 Scotland at 1 inch to the mile, these were never published, so we can't
279 buy them to scan in. Scotland was included in the Ordnance Survey
280 7<sup>th</sup> Edition at 1 inch to the mile, but almost all of these
281 maps remain in copyright for another few years, so we can't put them
282 online yet</p>
283<p>The Ordnance Survey did release some updates to the Popular Edition
284 of Scotland in the 1940s, which had the National Grid over-printed on.
285 them. (The War Office also published similar versions). While the grid
286 isn't parallel with the main map, it is possible to work with (just a
287 little bit more work). It has taken us much longer to track these down
288 than it took us to get the England and Wales New Popular Edition maps.
289 This is why we have only recently been able to offer a high degree of
290 coverage for Scotland.</p>
291
292<p>We now think we have completed our coverage of Scotland. Most of the
293 maps used are from the 1940s, but there are small numbers of earlier maps
294 (mostly 1920s), and small numbers of 7<sup>th</sup> edition maps from the
295 1950s. To see the coverage we have, visit the
296 <a href="/tiles/allmaps.html">large overview map.</a></p>
297
298
299<a name="northernIreland"></a>
300<h3>Why don't you have mapping data of Northern Ireland?</h3>
301
302<p>For Northern Ireland, the situation is harder than for Scotland,
303 because the Ordnance Survey of Northern Ireland didn't produce an
304 equivalent to the New Popular Edition, instead it produced a number of
305 updates without altering the name of the edition. So, many of the maps
306 from the Popular Edition of Northern Ireland are still in Copyright, so
307 it's hard to know if a given old map is out of copyright just from the
308 name.</p>
309<p>Compounding this, it is much harder to track down second hand maps
310 of Northern Ireland, compared to the difficulty of getting English,
311 Welsh and Scottish maps of the period. We have also yet to come across
312 any institutional holdings of old Northern Irish maps where the
313 holder will allow scans to be made. All we have been able to get is
314 quarter inch to the mile maps, which don't fit into our tiling scheme,
315 and are too small for finding postcodes on.</p>
316
317<p>If you would like to be notified when we do get out of copyright 1 inch
318 to the mile maps of Northern Ireland, please
319 <a href="scotlandAndNI.html">register your interest</a>.</p>
320
321
322<a name="who"></a>
323<h3>Who did the work?</h3>
324
325<ul>
326<li>Richard Fairhurst acquired and scanned the maps of England and Wales,</li>
327<li>Nick Burch, Andrew Rowbottom and Mike Calder have aquired and scanned
328 many of the maps of Scotland,</li>
329<li>The <a href="http://steve8.dev.openstreetmap.org/os7.htm">OpenStreetMap
330 7th Edition Project</a> have aquired and scanned some of the 7th
331 Edition maps of Scotland,</li>
332<li>Dominic Hargreaves, David Sheldon and Nick Burch straightened and tiled
333 the maps,</li>
334<li>Matthew Westcott, <a href="http://www.earth.li/~dave/">David Sheldon</a>,
335 Dominic Hargreaves and Nick Burch worked on the user interface and backend
336 software.</li>
337<li><a href="http://www.torchbox.com">Torchbox</a> has supported the project
338 with some development time and design work.</li>
339</ul>
340
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