need some advice

[Eric G . Miller]

On Fri, Jun 02, 2000 at 12:36:12AM +0930, Hari Kishore wrote:
> Hello all,
> 
> I am new to grass and am seeking advice on organising/compiling some
> data sets. For my research project I have a set of (22 to be precise)
> orthophotos and DEM.  The orthos covering a portion of a city are at
> 50cm resolution. Each tile is about 25-35 Megs in size. The Orthos are
> in BIL format. I have imported them in to Grass (grass 5.0beta7) and am
> contemplating making a mosaic of all the tiles and resample them to say
> 10 meter resolution. The ultimate aim is to drape vectors (proposed
> landuse zones) on these orthos which in turn is to be draped on a
> perspective/3D using the DEM.
> 
> In short I have 22 high resolution ortho photos that cover my study
> area. DEM of the sudy area as one map. Vectors (about 25 layers)  as one
> map covering the study area.
> 
> To begin with, to achive the above objective, is it necessary to have a
> mosaic of orthos ? or would it be possible to drape individual tiles
> over one largerDEM.

Which ever you find easier... In the latter case, make sure you have
NULL's defined properly.  d.rast -o <raster> will overlay and not draw
the NULL's as white.  Don't know how good the orthophotos will look
draped over a DEM.

> Also I am having problems compiling the NVIZ module (RH 6.2 on Intel). I
> keep getting the following error message.
> 
> .................................
> gstypes.h:8: GL/gl.h: No such file or directory
> GS.c:23: GL/gl.h No such file or directory
> make[1]: *** [OBJ.i686-linux-elf/GS.o] Error 1
> make[1]: Leavng directory 'hari/grass5.0beta/src/libes/ogsf'
> make: *** [nwish] Error 2
> .....................................

Presumably you don't have Mesa3.0 installed (OpenGL clone).

d3d may be better for the orthophotos than NVIZ.  NVIZ does a fair bit
of interpolation to speed rendering, at the cost of detail.

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