Litea,
1. When using Grid Splicer to add building footprints to a DEM you have to
be sure to use the correct splicing method. This will depend on which
elevation value each building footprint is attributed with i.e. the height
of the building above the ground or above sea level. Generally it is the
building height above the ground and it sounds like from your problem that
this is the case. In this situation you should use a Merge using the
Maximum as the calculation method.
2. I am not sure I understand this question however you are able to insert
the building into the 3D scene as a separate layer from the DEM. In this
way you can see your buildings and give the DEM some degree of transparency.
3. If I understand your question correctly you can get the effect of having
the grid invisible. For example if you wanted to show a street network file
in 3D but you don't want to see the DEM you would do the following. First
place the grid and the street network file in the same Map window. Next,
open the Layer Control and make the grid invisible. Next, make a drape of
the window. Finally, in GridView open the DEM and the corresponding drape
file. Make the DEM totally transparent which makes it invisible.
James Harvie
Vertical Mapper Product Manager
Northwood Technologies Inc.
43 Auriga Drive, K2E 7Y8
Nepean, Ontario, Canada
613-224-2020
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Litea Biukoto
Sent: Tuesday, June 06, 2000 5:56 PM
To: MapInfo-L (E-mail)
Subject: MI VM2
Hello
I'm trying to layer several grids in VM2/ Grid view to represent the data
layers that exist. The layers include hazards, DTM, bathymetry,
orthophotograph, etc.
1. I would like to update the existing grid (DTM) by adding building
heights to it, so that they appear as extrusions on the DTM. Each building
is represented by a region object. The information attached to each object
includes the height of the building in storeys. The regions were converted
to a grid with the Region to Grid utility, using the building height for
elevation. Using the Grid Splicer utility, the building grid is stamped on
the DTM. The projection and the grid units of the two grids are the same.
The resulting grid has pockets where the buildings stand.
2. Can a building grid be represented as columns with a transparent
base in Grid View?
3. Can a drape file be created with a transparent background? (Grid is
not visible in the layer).
Please do email if you would like me to clarify the above questions or if
you know of a simpler software to use.
TIA
Litea
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