J
Jim Hutton
Guest
On Tue, 24 Feb 2004 16:37:28 -0000, "Paul Saunders"
<[email protected]> wrote:
>Jim Hutton wrote:
>
>> Incidentally, someone suggested using aerial photos as a basis for maps. Copyright applies just
>> as much here, so a map based on someone else's aerial photos is still infringing copyright.
>>
>> This may all be old history shortly - I have heard a rumour that NSA are planning to release
>> detailed satellite photos (5m resolution !) for the whole of Europe. AFAIK there will be no
>> copyright reserved.
>
>Yeah, but how are you going to work out the contour lines? Hilly land tends to look very flat from
>an aerial view.
>
>Paul
True. Unless they kindly release stereo pairs ....
For my purposes the photos will do fine. Still not as good as a modern OS map would be (a footpath
or even a road can be surprisingly hard to spot if the area is wooded or broken ground), but better
than nothing.
I am aiming at 'maps' which will be uploadable to the current range of Garmin gps, so the limits of
the screen size etc rule out contours. I want the pics to give me such things as streams, etc which
are hard (and wet) to map with a gps.
I intend the gps maps to be used in conjunction with (eg) OS paper maps or computer software to
provide contours, route profiles etc. The gps map simply has the objective of showing you where you
are on the map at a glance without the need to rule off a numeric map reference. The ones I already
have done work fine IMHO. The assumption is (a) you have a paper map and (b) you know roughly where
you are already (ie on Scafell not Bowfell. May not always be true for some people...).
Jim Hutton
<[email protected]> wrote:
>Jim Hutton wrote:
>
>> Incidentally, someone suggested using aerial photos as a basis for maps. Copyright applies just
>> as much here, so a map based on someone else's aerial photos is still infringing copyright.
>>
>> This may all be old history shortly - I have heard a rumour that NSA are planning to release
>> detailed satellite photos (5m resolution !) for the whole of Europe. AFAIK there will be no
>> copyright reserved.
>
>Yeah, but how are you going to work out the contour lines? Hilly land tends to look very flat from
>an aerial view.
>
>Paul
True. Unless they kindly release stereo pairs ....
For my purposes the photos will do fine. Still not as good as a modern OS map would be (a footpath
or even a road can be surprisingly hard to spot if the area is wooded or broken ground), but better
than nothing.
I am aiming at 'maps' which will be uploadable to the current range of Garmin gps, so the limits of
the screen size etc rule out contours. I want the pics to give me such things as streams, etc which
are hard (and wet) to map with a gps.
I intend the gps maps to be used in conjunction with (eg) OS paper maps or computer software to
provide contours, route profiles etc. The gps map simply has the objective of showing you where you
are on the map at a glance without the need to rule off a numeric map reference. The ones I already
have done work fine IMHO. The assumption is (a) you have a paper map and (b) you know roughly where
you are already (ie on Scafell not Bowfell. May not always be true for some people...).
Jim Hutton