ps.map: vlines use of attributes

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ps.map: vlines use of attributes

Rich Shepard
I'm preparing maps of fish distributions within a river network. For a
couple of species there are two stocks of interest, i.e., green and white
sturgeon and fall and spring chinook salmon. For both pairs some parts of
their distributions overlap and I want to display both the distinct and
overlap reaches. Each species/stock has its own data file.

Looking a vlines' attributes it seems to me that some or all of width,
cwidth, hcolor, hwidth, offset, and coffset can be used in the two vlines
stanzas. Are there examples of ps.maps that use these attributes, or are
there guidelines that provide insight into their specific effects?

If not I guess it is a matter of trial-and-error on my part.

Carpe weekend and stay well,

Rich
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Re: ps.map: vlines use of attributes [UPDATE]

Rich Shepard
On Fri, 3 Jul 2020, Rich Shepard wrote:

> I'm preparing maps of fish distributions within a river network. For a
> couple of species there are two stocks of interest, i.e., green and white
> sturgeon and fall and spring chinook salmon. For both pairs some parts of
> their distributions overlap and I want to display both the distinct and
> overlap reaches. Each species/stock has its own data file.

> If not I guess it is a matter of trial-and-error on my part.

Trial-and-error results:

Use of the offset attribute of one vlines and adjustment of the line widths
produced acceptable maps where the distributions of the two fishes can be
distinguished.

The offset attribute is marked as 'experimental' and I've a suggestion for
an enhancement of this feature: allow a negative offset to set that line to
the other side.

On my maps one species distribution was overlaid on the underlying
hydrography layer while the other species was offest to the east a couple of
pixels. Ideally, each would be offest 0.5 pixel on either side of the
hydrography layer.

Rich
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