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On 09/05/2023 23:53, Rich Shepard
wrote:
I'm
trying to clip the vector contour map with its very large areal
coverage to my project's analysis area (image attached). The
v.clip module
has three parameters: input map, clip map, output map. I wonder if
the
structure of my analysis area is the source of the error(s).
Analysis area used for input with v.in.ascii (output name
clipbox):
L 5 1
2306066.00 224201.00
2307121.58 224201.00
2307121.58 223164.00
2306066.00 223164.00
2306066.00 224201.00
1 1
Your v.in.ascii command has create a *line* feature, (the L on
the first line) not an area. Even though the lines connect it's
not a boundary, and there's no centroid, which is required for a
closed boundary to be considered a polygon area. Have another
look at the v.in.ascii man page, and refer to Example 1 a). You'll
need to define the list of corners as B (not L) and also add
another few lines for the centroid.
The
command and its results:v.clip in=base_contours clip=clipbox
out=dm_baseline
--------------------------------------------------------------------------------
Default clipping with dissolved clip map.
--------------------------------------------------------------------------------
WARNING: No 'column' option specified. Dissolving based on
category values
from layer <1>.
Extracting features...
100%
Building topology for vector map
<temp_13361@northside_rock>...
Registering primitives...
Writing attributes...
Removing duplicate centroids...
Building topology for vector map
<temp_13361@northside_rock>...
Registering primitives...
Copying vector features from
<base_contours@northside_rock>...
100%
Copying vector features from <temp_13361@northside_rock>...
ERROR: No area features found in vector map
<temp_13361@northside_rock>.
Verify 'btype' parameter.
ERROR: Clipping steps failed. Check above error messages and see
following
details:
Module run `v.overlay ainput=base_contours
binput=temp_13361
operator=and output=dm_baseline olayer=0,1,0` ended with an
error.
The subprocess ended with a non-zero return code: 1. See
errors
above the traceback or in the error output
====================================================
Perhaps the error is the result of my not using the -d option
because I'm
not sure what would be dissolved with it: the contours external to
the
clipbox? Which is what I want.
Confused,
Rich
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--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
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