[PROJ] Odd 6.3.0RC1 issue

[Roger Bivand]

On Mon, 30 Dec 2019, Even Rouault wrote:

>> You can't. GetAttrValue() is about asking value of WKT(1) nodes, of PROJ.4
>> string
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> I meant *not parts* of PROJ.4 string
>

No, but I can (and do) retreive DATUM and TOWGS84 from objects 
instantiated when reading vector files to check whether they vanish from 
proj4 strings.

Status is that legacy R-sp-workflows and modern R-sf-workflows will move 
to WKT2 as the internal CRS representation, but in the R-sp-workflow case, 
PROJ4 strings must be retained too, even though the WKT2 representations 
will be used for transformation and file export. PROJ4 strings are also 
needed to define CRS.

Here I'm just reporting a very puzzling issue. Checking across some other 
EPSG, it seems to affect EPSG:27700 (the Snow Soho Cholera data set, the 
Scottish lip cancer data set), and not in all contexts. However, the 
problem was not present with 6.2.1, and is now.

Roger

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-- 
Roger Bivand
Department of Economics, Norwegian School of Economics,
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