Hi
This is very difficult if you want a realistic and correct result.
I have encountered two solutions which can deal with that problem, one is
Vertical Mapper (create additional points with poly2points and then
perform a inperpolation, either with natural neighborhood or inerse
distance weigthing with 3 or 4 zones with 1 as minimum and 3-5 as maximum
- the search distance has to bee a littel longer than the holes in the
dataset, but not the default value). The other is IDRISI32, but it's slow
compared to vertical mapper and has problems with large datasets.
Don't use TIN or simple inverse distance weigthing - these methods will
create interpolation artifacts steps in your model (it's always a good
idea to look at a histogram of the resulting grid)
Ole Gregor,
Viborg Amt, Miljø og Teknik
(45) 87 27 13 07
"Kristi Markham" <[EMAIL PROTECTED]>
Sendt af: [EMAIL PROTECTED]
07-02-2001 22:32
Besvar venligst til "Kristi Markham"
Til: <[EMAIL PROTECTED]>
cc:
Vedr.: MI-L creating a dem from contour data
This is a question from a very inexperienced MapInfo user - I have =
topographic data (contours, elevation points, waterbodies, etc.) in =
MIF/MID format. I would like to create a raster DEM (to be imported =
into another program) from the contour data. Can anyone tell me a =
simple way of doing this? I tried the "grid" function in MapInfo, but =
that only seemed to grid the data based on the centre point of the =
contour polygons...
Thanks for your help!
Kristi Markham
School of Geography and Geology
McMaster University
905-525-9140 ext. 27086
[EMAIL PROTECTED]
_______________________________________________________________________
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.
_______________________________________________________________________
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.
