Check what kind of projection you are using i.e., equal area, mercator,
conical, etc. I believe your best bet to preserve the real distances
are with an equal area projection.
Stan Johnston
Geologist
"Smith,Paul" wrote:
>
> BUFFER INACCURACIES
>
> Does anyone know why buffers become increasingly more inaccurate on certain
> bearings above distances of 4000+ Nautical Miles??
>
> eg. For buffers centred on the UK, the buffer distances are correctly
> measured to the South (to South Africa), West(the USA) & East(to Russia) ie.
> on lines of longitude and latitude passing through the buffer's origin.
> Sections of buffers to the South West (South America) & South East
> (Indonesia) & presumable to the NE & NW become increasingly more inaccurate
> with distance from the origin (UK).
>
> Tracing around the buffer's perimeter with the RULER tool (which correctly
> measures the distance) centred on the UK shows the extent of the inaccuracy
> along the a 4000Nmile buffer which can be up to 500 Nmiles out!,
> thanks in anticipation,
>
> PAUL SMITH
> ----------------------------------------------------------------------
> To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put
> "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
----------------------------------------------------------------------
To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put
"unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
