Hi Peter
Is this still the case with version 2.6 ???
*********** REPLY SEPARATOR ***********
On 19.07.2000 at 06:16 Resource Information Focus Group wrote:
>Michelle,
>Vertical Mapper is the perfect tool for this application, however, be
>careful when you interpret the slope values.
>VM calculates slope differently to what we are used to in Australia.
>We calculate slope from the ratio of vertical displacement to horizontal
>displacement (hade) whereas VM calculates slope from the ratio of vertical
>displacement to slope displacement (dip) - this can give significant
>differences between dip and hade (the terminology used to identify each
>method) in steep country.
>
>Eg.
>
>%Dip %Hade
>30 32
>45 51
>60 75
>71 100
>
>We get around the problem by using the calculated Dip% to get the required
>Hade% and then editing the generated legend to list the values in Hade% - it
>would be easier if VM gave you the option to use either method.
>
>Regards
>Peter Graham
>WS Group
>33 Brisbane Street
>Mackay Q 4740
>Australia
>Ph: (07) 4951 2911
>Fx: (07) 4953 1319
>Em: [EMAIL PROTECTED]
>Web: wsgroup.com.au
>
>
>-----Original Message-----
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED]]On Behalf Of James Harvie
>Sent: Wednesday, 19 July 2000 1:10 AM
>To: MapInfo L (E-mail)
>Subject: Re: MI Gradient/slope shading
>
>
>Michelle,
>
>I think Vertical Mapper would be able to help you with this problem. By
>performing a slope calculation on the DEM file you can easily define areas
>that are to steep for a vineyard. In fact you can use the Grid Query on the
>results of slope and aspect calculation to determine ideal locations that
>are not only at a preferred slope but also the preferred orientation to true
>north. These are just two of many tools that can be used for this
>application.
>
>Check out http://www.northwoodtec.com/verticalmapper.htm
>
>James Harvie
>Vertical Mapper Product Manager
>Northwood Technologies Inc.
>43 Auriga Drive, K2E 7Y8
>Nepean, Ontario, Canada
>613-224-2020
>
>
>----- Original Message -----
>From: General
>To: MapInfo Discussion Group
>Sent: Monday, July 17, 2000 7:56 AM
>Subject: MI: Gradient/slope shading
>
>
>Hi,
>
>I have a client who wants his elevation data contoured (easy) and
>then shaded by gradient. He needs to highlight the areas too steep
>for the planting of grapevines. I could use the relief shading to
>give a general idea, but was hoping for something a little more
>qualitative. I'm running MI 6.0. Any suggestions?
>
>TIA
>
>Michelle Smith
>Frontier Mapping Pty Ltd
>Australia
>
>
>
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