Michael Sumner
Sent: 07 December 2012 19:33
To: roger.biv...@nhh.no
Cc: r-sig-geo@r-project.org
Subject: Re: [R-sig-Geo] Distance between two points
Reproject the points to the coordinate system of thr grid, do the overlay then
copy the attributes back. No need to warp a raster just for over(lay
r for warping.
>
> Roger
>
>
>> Sarah
>>
>>
>> Thanks again for your help.
>>>
>>> Cheers,
>>>
>>> Simon
>>>
>>> -Original Message-
>>> From: Sarah Goslee [mailto:sarah.gos...@gmail.com]
>
: O'Hanlon, Simon J
Cc: r-sig-geo@r-project.org
Subject: Re: [R-sig-Geo] Distance between two points
Precisely. You should use great-circle distances with lat-lon coordinates,
rather than Euclidean distance, because the actual length varies with position
on the globe.
Converting to UTM or so
. Or am
I missing something?
Sarah
> Thanks again for your help.
>
> Cheers,
>
> Simon
>
> -Original Message-
> From: Sarah Goslee [mailto:sarah.gos...@gmail.com]
> Sent: 07 December 2012 14:18
> To: O'Hanlon, Simon J
> Cc: r-sig-geo@r-project.org
> S
Precisely. You should use great-circle distances with lat-lon
coordinates, rather than Euclidean distance, because the actual length
varies with position on the globe.
Converting to UTM or something similar is one solution if your points
are not too far apart.
There are many other R solutions: se
Dear list,
I am using the package geoRglm to do some predictive mapping. There is a
function that calculates the distance between observed data points and the
prediction locations using a .C call to a function which eventually calculates
the length of the hypotenuse between one location and the
