[GRASSLIST:4712] vector point dataset

[Brent Wood]

I have a vector point dataset (ascii XYZ, the basis of a DEM).

I'm importing into GRASS5.7 with

cat <file> | v.in.ascii -Z output=nzxyz xcol=1 ycol=2 zcol=2 catcol=0

There are about 4,000,000 XYZ points.

The vector coor file is 150Mb. GRASS is now building the topology & index.
The topo file is almost 200Mb and the sidx is at 430Mb and growing.

Is this normal? It seems very excessive for a point dataset. A spatial
index & topology make more sense for line/polygon data, with over 4x the
actual data volume to store this extra info doesn't look right somehow...

The system is a SuSE Linux 9.1 23 bit OS on A64 3500 with 1Gb memory.
Swapped out 1.4Gb & still using 800Mb main memory.


Any advice appreciated....


  Brent Wood