Re: [OSM-talk] Potlatch 1.3

2009-11-25 Thread Martin Koppenhoefer
2009/11/25 Frederik Ramm 

> Hi,
>
> Iván Sánchez Ortega wrote:
> > El Martes, 24 de Noviembre de 2009, Frederik Ramm escribió:
> >> Maybe "~= 100km", but "== 60 nm".
> >
> > Am I the only one who has read that as "60 nanometers"?
>
> No, a certain Martin K. has already reported the same. I'd say it
> depends on context; nm is often, if sloppily, used in aviation at least,
> but since sub-meter precision isn't required there, nobody will misread it.
>

+1. It's hard to misread and if you think instead of reading like a computer
you will get it, stil it literally reads "nanometer", while Nautical Miles
officially should abbr. NM
http://en.wikipedia.org/wiki/Nautical_mile
(they also say *M*, *Nm* or *nmi) *but I wouldn't use Nm either, as this is
the official abbr. for energy (Newton metres =Joule).

cheers,
Martin
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Re: [OSM-talk] Potlatch 1.3

2009-11-25 Thread Richard Fairhurst

Andrew Errington wrote:
> When I slide the aerial photos around (by holding the space bar) the
> photo layer jumps around and seem to snap to positions far away 
> from where the mouse is.  This didn't used to happen.
>
> I'm sure this is not the right place to file a bug report

Please post a ticket at http://trac.openstreetmap.org/ - it's very difficult
to keep track of reports if they come in through 87634 different avenues.
Thanks!

cheers
Richard
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Re: [OSM-talk] Potlatch 1.3

2009-11-24 Thread Frederik Ramm
Hi,

Iván Sánchez Ortega wrote:
> El Martes, 24 de Noviembre de 2009, Frederik Ramm escribió:
>> Maybe "~= 100km", but "== 60 nm". 
> 
> Am I the only one who has read that as "60 nanometers"?

No, a certain Martin K. has already reported the same. I'd say it 
depends on context; nm is often, if sloppily, used in aviation at least, 
but since sub-meter precision isn't required there, nobody will misread it.

Bye
Frederik

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Re: [OSM-talk] Potlatch 1.3

2009-11-24 Thread Bráulio Bezerra da Silva
I'm still reading it "nanometers" even after reading your email and after
spending 7 months in a flight simulator company!

2009/11/24 Iván Sánchez Ortega 

> El Martes, 24 de Noviembre de 2009, Frederik Ramm escribió:
> > Maybe "~= 100km", but "== 60 nm".
>
> Am I the only one who has read that as "60 nanometers"?
>
>
> --
> --
> Iván Sánchez Ortega 
>
> http://ivan.sanchezortega.es
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Re: [OSM-talk] Potlatch 1.3

2009-11-24 Thread Iván Sánchez Ortega
El Martes, 24 de Noviembre de 2009, Frederik Ramm escribió:
> Maybe "~= 100km", but "== 60 nm". 

Am I the only one who has read that as "60 nanometers"?


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Re: [OSM-talk] Potlatch 1.3

2009-11-24 Thread Andrew Errington
On Wed, November 25, 2009 07:40, Peter Miller wrote:
>

> On 23 Nov 2009, at 16:58, Iván Sánchez Ortega wrote:
>
>
>> El Lunes, 23 de Noviembre de 2009, Richard Fairhurst escribió:
>>
>>> Potlatch now lets you zoom in as far as zoom level 23. Previous
>>> versions only went up to z19, and even then with some loss of
>>> positional accuracy.

:(

When I slide the aerial photos around (by holding the space bar) the photo
layer jumps around and seem to snap to positions far away from where the
mouse is.  This didn't used to happen.

I'm sure this is not the right place to file a bug report, but since we're
talking about v1.3...

Andrew


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Re: [OSM-talk] Potlatch 1.3

2009-11-24 Thread Peter Miller

On 23 Nov 2009, at 16:58, Iván Sánchez Ortega wrote:

> El Lunes, 23 de Noviembre de 2009, Richard Fairhurst escribió:
>> Potlatch now lets you zoom in as far as zoom level 23. Previous
>> versions only went up to z19, and even then with some loss of
>> positional accuracy.
>
> I can already see the headlines of Potlatch 2.0:
>
> "Potlatch, now with more resolution than the real world!"

The excellent book 'Map Addict' muses about the ultimate 1:1 map  
quoting from a story of 'exactitude in science' from 1946 as follows:  
"and so the College of Cartography evolved a Map of the Empire that  
was the same scale as the empire and that coincided with it point for  
point... succeeding generations came to judge a map of such magnitude  
cumbersome, and not without irreverence they abandoned it to the  
rigours of the sun and rain'

I am sure that Potlatch 2.x will never be abandoned to the rigours of  
the sun and rain (even if Potlatch 1.x does meet that fait ;) )

A thoroughly recommend book. The only heath warning is that the guy  
loves the Ordnance Survey and can't bring himself to even mention OSM  
- he nearly does but clearly OSM is not a proper map to his mind.
http://www.amazon.co.uk/Map-Addict-Mike-Parker/dp/0007300840

Great work Richard.



Regards,


Peter


>
> :-P
>
> -- 
> --
> Iván Sánchez Ortega 
>
> Un ordenador no es un televisor ni un microondas, es una herramienta  
> compleja.
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Re: [OSM-talk] Potlatch 1.3

2009-11-24 Thread Anthony
On Tue, Nov 24, 2009 at 1:41 AM, John Smith  wrote:
> 2009/11/24 Anthony :
>> Nevermind.  That's about half an inch, and it doesn't seem to be less
>> than a pixel (at my latitude/longitude, anyway).  For some reason last
>> time i calculated it I thought it was more.
>
> You should use metric it's easier since metric distances were based on
> a rough approximation of the circumference of the earth ;)

I did, but then I stuck the result (of 0.0110574 meters) into Google
"0.0110574 meters to inches" to convert it into inches.  I guess if I
had thought about it 1.1 cm is also reasonable.  0.011 meters just
didn't strike me as anything useful.  I should have thought about it
more.

I believe my mistake the first time around was to use 1*10^-6 instead
of 1*10^-7, because I came up with about 1/3 of a foot (which is
approximately the length of 1*10^-6 degree of longitude in Tampa).  I
don't remember, because I came up with that several weeks ago, and
only the end result of 1/3 foot stuck in my head.

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Re: [OSM-talk] Potlatch 1.3

2009-11-24 Thread Martin Koppenhoefer
2009/11/23 Richard Fairhurst 

> Hi all,
>
> I'm pleased to announce Potlatch 1.3 - a new version with one major
> improvement.
>
> Potlatch now lets you zoom in as far as zoom level 23. Previous
> versions only went up to z19, and even then with some loss of
> positional accuracy.
>

great news. I'm very pleased to hear so soon from this :D

cheers,
Martin
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Re: [OSM-talk] Potlatch 1.3

2009-11-23 Thread John Smith
2009/11/24 John Smith :
> 1 nautical mile is exactly 1852m

Sorry, it was set to 1853m.

http://en.wikipedia.org/wiki/Nautical_mile

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Re: [OSM-talk] Potlatch 1.3

2009-11-23 Thread John Smith
2009/11/24 Frederik Ramm :
> Maybe "~= 100km", but "== 60 nm". One nautical mile is exactly one minute of

Because they estimated the circumference to 36,000km, but it's over 40,000km

> arc. Say again which system was naturally suited for all things geo?

1 nautical mile is exactly 1852m

Actual circumference of the earth: 40,075.02 KM (equatorial) 40,007.86
KM (meridional) 40,041.47 KM (mean)

1.852*60*360 = 40003.2

Yet another close approximation.

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Re: [OSM-talk] Potlatch 1.3

2009-11-23 Thread Frederik Ramm
Hi,

John Smith wrote:
> You should use metric it's easier since metric distances were based on
> a rough approximation of the circumference of the earth ;)
> 
> 1 degree of latitude and at the equator, 1 degree of longitude ~=
> 100km

Maybe "~= 100km", but "== 60 nm". One nautical mile is exactly one 
minute of arc. Say again which system was naturally suited for all 
things geo?

Bye
Frederik

-- 
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Re: [OSM-talk] Potlatch 1.3

2009-11-23 Thread John Smith
2009/11/24 Anthony :
> Nevermind.  That's about half an inch, and it doesn't seem to be less
> than a pixel (at my latitude/longitude, anyway).  For some reason last
> time i calculated it I thought it was more.

You should use metric it's easier since metric distances were based on
a rough approximation of the circumference of the earth ;)

1 degree of latitude and at the equator, 1 degree of longitude ~=
100km, so every decimal place from there is an order of magnitude
less.

0.1 ~= 10km
0.01 ~= 1km
0.001 ~= 100m
0.0001 ~= 10m
0.1 ~= 1m
0.01 ~= 10cm
0.001 ~= 1cm

An inch was standardised based on metric :)

1 inch = 2.54cm exactly

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Re: [OSM-talk] Potlatch 1.3

2009-11-23 Thread Anthony
On Tue, Nov 24, 2009 at 12:37 AM, Anthony  wrote:
> 2009/11/23 Iván Sánchez Ortega :
>> El Lunes, 23 de Noviembre de 2009, Richard Fairhurst escribió:
>>> Potlatch now lets you zoom in as far as zoom level 23. Previous
>>> versions only went up to z19, and even then with some loss of
>>> positional accuracy.
>>
>> I can already see the headlines of Potlatch 2.0:
>>
>> "Potlatch, now with more resolution than the real world!"
>>
>> :-P
>
> On that note, snapping to the nearest 0.001 degrees would be
> appreciated, since that is (I believe) the smallest resolution
> currently allowed by the OSM database, and is (usually, I believe)
> less than one pixel at z23.
>
Nevermind.  That's about half an inch, and it doesn't seem to be less
than a pixel (at my latitude/longitude, anyway).  For some reason last
time i calculated it I thought it was more.

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Re: [OSM-talk] Potlatch 1.3

2009-11-23 Thread Anthony
2009/11/23 Iván Sánchez Ortega :
> El Lunes, 23 de Noviembre de 2009, Richard Fairhurst escribió:
>> Potlatch now lets you zoom in as far as zoom level 23. Previous
>> versions only went up to z19, and even then with some loss of
>> positional accuracy.
>
> I can already see the headlines of Potlatch 2.0:
>
> "Potlatch, now with more resolution than the real world!"
>
> :-P

On that note, snapping to the nearest 0.001 degrees would be
appreciated, since that is (I believe) the smallest resolution
currently allowed by the OSM database, and is (usually, I believe)
less than one pixel at z23.

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Re: [OSM-talk] Potlatch 1.3

2009-11-23 Thread Iván Sánchez Ortega
El Lunes, 23 de Noviembre de 2009, Richard Fairhurst escribió:
> Potlatch now lets you zoom in as far as zoom level 23. Previous
> versions only went up to z19, and even then with some loss of
> positional accuracy.

I can already see the headlines of Potlatch 2.0:

"Potlatch, now with more resolution than the real world!"

:-P

-- 
--
Iván Sánchez Ortega 

Un ordenador no es un televisor ni un microondas, es una herramienta compleja.


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Re: [OSM-talk] Potlatch 1.3

2009-11-23 Thread Dave F.
Richard Fairhurst wrote:
> Hi all,
>
> I'm pleased to announce Potlatch 1.3 - a new version with one major  
> improvement.
>
> Potlatch now lets you zoom in as far as zoom level 23. 
Excellent news. Thank you

Dave F.

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[OSM-talk] Potlatch 1.3

2009-11-23 Thread Richard Fairhurst
Hi all,

I'm pleased to announce Potlatch 1.3 - a new version with one major  
improvement.

Potlatch now lets you zoom in as far as zoom level 23. Previous  
versions only went up to z19, and even then with some loss of  
positional accuracy.

This makes Potlatch much more suitable for tracing buildings, and  
other fine detail, from high quality aerial imagery like the NearMap  
imagery available in Australia. Don't forget that there's the option  
to 'Use thin lines at all scales' to make high-resolution work easier,  
too.

A fair amount of the scaling code has been reworked to cope with this,  
so if you spot any mishaps on the way, reports at  
http://trac.openstreetmap.org/ are welcome as usual.

This might be the last major revision of Potlatch 1.x - because work  
is now well underway on Potlatch 2, which is a complete rewrite with  
some whizzy new features. But more on that anon!

cheers
Richard


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