Yes Robert,
Definately interested in ANUDEM for MI, anyone else?
What do you think it would cost?
Thanks for your reply.
Laith
-----Original Message-----
From: Robert Crossley [SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, 28 September 1999 15:42
To: 'Laith Wark'
Subject: RE: MI From XYZ to slope anaylsis
Yes and no. The quality of the slope analysis will be dependant on the
quality of the terrain model (DTM). I am not sure about the product
Relief, but the quality of the DTM's created by VM leaves a bit to be
desired. When you use contours, the model looks more like steps than a
landscape. The corresponding slope analysis is thus useless.
Slope is the first derivative of elevation (i.e. the rate of change in
elevation). If you go one derivative further, i.e. change in slope, the
analysis is even more useless.
Generally spot elevations would work better in VM than contours.
I use a product called ANUDEM, that interprets the elevations and
reintrprets tham to create a hydologically sound (their words) DTM. The
slope analysis is much better. The only problem is that it works in arc
grid format. I have half done an interface to it for MapInfo, that if
enough people were interested, I could finish. The output goes nicely into
VM, and then the slope analysis in VM is quite good.
Robert.
-----Original Message-----
From: Laith Wark [SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, September 28, 1999 12:13 PM
To: MapInfo List Serve (E-mail)
Subject: MI From XYZ to slope anaylsis
Friends,
I have about 5000 spot elevations for an area which I need to generate a
map depicting slope ranges. I am aware of packages such Vertical Mapper
and Relief. My question is, are spot elvations (points with X,Y,Z coords)
sufficient data format for these software packages to generate slope
analysis?
Or, in other words. I want to analyse slope. I've got X,Y,Z coords.
Where do I go from here?
Thanks in advance.
=============================
Laith Wark
EDAW (Aust) P/L
Design, Planning and
Environments Worldwide
Level 4 Rowes Building
235 Edward Street
Brisbane 4000
Australia
Ph: INT +61 (0)7 3229 6422
Fx: INT +61 (0)7 3229 6422
Email: [EMAIL PROTECTED]
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