Fran�ois
The algorithm for slope in VM is not always "rise over run", and it can
be quite a significant difference as we found out for a court case
earlier this year.
The differences come around when slope is analysed as "percent slope".
Version 2.5 calculates % slope differently to Version 2.6.
Ver 2.5 - %slope = vert distance/slope distance (i.e. the hypotenuse
of the slope triangle)
Ver 2.6 - %slope = vert distance/horizontal distance
It happens that the Australian convention for %slope in most land use
situations matches Ver2.6, not 2.5, and as the slope increases the
difference becomes quite significant.
Regards
Rod Dawney
------------------------------------------------------------------
AUSMEC - Australasian Mineral Exploration Consultants
PO Box 183, Albert St PO, Brisbane, Queensland, 4002 AUSTRALIA
Phone: 61 7 32100249 Fax: 61 7 32294554
Email: [EMAIL PROTECTED] Web: http://www.ausmec.com.au
-----------------------------------------------------------------
Fran�ois Bergeron wrote:
>Hi!
>
>Does someone know the algorithm (formula) Vertical Mapper uses to
>calculate the slope function?
>
>Thanks in advance!!
>
>Salutations,
>_______________________________
>
>Fran�ois Bergeron / [EMAIL PROTECTED]
>Charg� des Services G�omatiques
>_______________________________
>
>KOREM
>Technologies de G�Odiffusion
>_______________________________
>
>680, boul. Charest Est, Bureau 120
>Qu�bec (Qu�bec)
>G1K 3J4
>T�l. : (418) 647-1555
>T�l�c. : (418) 647-1666
>1 888 440-1MAP
>www.korem.com
>________________________________
>
>Meilleur nouveau partenaire MapInfo 2000 - Am�rique du Nord
>________________________________
>
>
_______________________________________________________________________
List hosting provided by Directions Magazine | www.directionsmag.com |
To unsubscribe, send e-mail to [EMAIL PROTECTED] and
put "unsubscribe MapInfo-L" in the message body.
