[GRASS-user] v.surf.idw G_Malloc

[Paul Kelly]

On Tue, 15 Jan 2008, Matthew James wrote:

> Hi Paul - thanks for the fast reply.
>
> Ok - my import command is -
>
> v.in.ascii input=/home/Matthew/XYGrp45.csv output=vectorOut format=point
> fs=, skip=0 'columns=x double precision, y double precision, yield double
> precision' x=2 y=1 z=3 cat=0
>
> output of that command is -
>
> Maximum input row length: 28
> Maximum number of columns: 3
> Minimum number of columns: 3
> Building topology ...
> Registering lines:    1000          2000          3000          4000
> 5000          6000          7000          8000          9000         10000
> 11000         12000         13000         14000         15000         16000
> 17000         18000         19000         20000         21000         22000
> 23000         24000         25000         26000         27000         28000
> 29000         30000         31000         32000         33000         34000
> 35000         36000         37000         38000         39000         40000
> 41000         42000         43000         44000         45000         46000
> 47000         48000         49000         50000         51000         52000
> 53000         54000         55000         56000         57000         58000
> 59000         60000         61000         62000         63000         64000
> 65000         66000         67000         68000         69000         70000
> 71000         72000         73000         74000         75000         76000
> 77000         78000         79000         80000         81000         82000
> 83000         84000         85000         86000         87000         88000
> 89000         90000         91000         92000         93000         94000
> 95000         96000         97000         98000         99000        100000
> 101000        102000        103000        104000        105000        106000
> 107000        108000        109000        110000        111000        112000
> 113000        114000        115000        116000        117000        118000
> 119000        120000        121000        122000        123000        124000
> 125000        126000        127000        128000        129000        130000
> 131000        132000        133000        134000        135000        136000
> 137000        138000        139000        140000        141000        142000
> 143000        144000        145000        146000        147000
> 147909 primitives registered
> Building areas:
>
>
> 0 areas built
> 0 isles built
> Attaching islands:
> Attaching centroids:
>
> Topology was built.
> Number of nodes     :   147872
> Number of primitives:   147909
> Number of points    :   147909
> Number of lines     :   0
> Number of boundaries:   0
> Number of centroids :   0
> Number of areas     :   0
> Number of isles     :   0
>
> MY SURF.IDW COMMAND -
>
> v.surf.idw input=vectorOut output=rasterOut npoints=12 column=3

I think you need column=yield rather than column=3. 150000 points isn't a 
huge amount and should be easy enough to work with. But for much large 
datasets it would be easier to work with if you create a 3-D vector by 
using the -z flag with v.in.ascii (and leave out the columns option). Then 
you could use layer=0 for v.surf.idw to interpolate using the z 
co-ordinate.

No idea where the G_malloc error is coming from but hopefully it will go 
away with the correct column parameter...

Paul