[GRASS-dev] v.clean meters against feets

[Luca Delucchi]

Hi everybody,

I'm testing v.clean with meters and feet projection system.
I'm trying to run v.clean in the same map and with the same
parameters, but I obtain a different result. For the testing I'm using
zipcodes_wake map of nc_spm_08

Here my procedure:

- download nc_spf location from here [0]
- reproject zipcodes_wake from nc_spm_08 to nc_spf

- run v.clean on meters location with "v.clean in=zipcodes_wake
out=zipcodes_wake_clean tool=rmarea thre=10000000" the result is

Number of nodes: 106
Number of primitives: 166
Number of points: 0
Number of lines: 0
Number of boundaries: 135
Number of centroids: 31
Number of areas: 31
Number of isles: 2


-  run v.clean on feet location with "v.clean in=zipcodes_wake
out=zipcodes_wake_clean tool=rmarea thre=107638674"

Number of nodes: 84
Number of primitives: 103
Number of points: 0
Number of lines: 0
Number of boundaries: 93
Number of centroids: 10
Number of areas: 10
Number of isles: 1

The threshold in feet should be the same of the meters one because:

1 meters is 0.3048006096012192 feet (according with g.proj output)

and

10000000 squared meters is 107638674 squared feet ( 10000000 / 0.3048^2 )

I expected the same output map, but this not happen; I'm wrong or
there is something wrong in the v.clean code?


[0] http://grass.osgeo.org/sampledata/north_carolina/nc_spf.tar.gz

-- 
ciao
Luca

http://gis.cri.fmach.it/delucchi/
www.lucadelu.org