[R-sig-Geo] add a field to sf object and point shape in kml

[Marta Rufino]

Hi,

Cool! Thank you for the very quick and efficient reply.

Just remembered an alternative for the kml challenge... using plotKML after
converting it to spatial.

library(plotKML)
plotKML(as(my.sf.file, "Spatial"), colour_scale=SAGA_pal[[1]]) # this
function has a very detailed help with many easy options. This is just an
example...

It is a pity that it still does not work directly with sf objects (hehehe -
Edzer? Tom?) - but this way it is fine.

I am trying to retrieve the issues I found previously with adding fields
this way... if I find it I will report those.

Cheers,
M.


Vijay Lulla <vijaylulla using gmail.com> escreveu no dia terça, 7/05/2019 à(s)
18:11:

> Good one Barry!  As far as I'm aware sf uses rgdal to write various file
> formats and writeOGR has options called dataset_options and layer_options
> which are considered experimental.  Do you know if either of these options
> can be used instead of creating a new field/attribute for the sf
> dataframe?  More importantly, I would like to know your opinion of using
> these options vs creating an attribute.
> Thanks in advance,
> Vijay.
>
> On Tue, May 7, 2019 at 11:07 AM Barry Rowlingson <b.rowlingson using gmail.com>
> wrote:
>
>> On Tue, May 7, 2019 at 12:54 PM Marta Rufino <marta.m.rufino using gmail.com>
>> wrote:
>>
>> > Hi,
>> >
>> > Two very simple question:
>> >
>> > 2)
>> > Can we change the polygon col/fill and point shape/col when exporting sf
>> > obejcts to kml, using the function:
>> > st_write(sf.object, " sf.object  .kml", driver='kml')
>> >
>> >
>> Setting styles for writing KML using GDAL/OGR is described here:
>>
>>
>> https://gis.stackexchange.com/questions/297494/how-to-style-kml-through-libkml-layer-creation-options
>>
>> For example I have an sf data frame of Osprey tracking data (as points),
>> and if I create a new field:
>>
>>
>> osp$OGR_STYLE="PEN(c:#128020,w:5px)"
>>
>> and then:
>>
>> st_write(osp, "/tmp/osp.kml",driver="libkml")
>>
>> then the features in the KML get written with:
>>
>>          <LineStyle>
>>             <color>ff208012</color>
>>             <width>5</width>
>>           </LineStyle>
>>
>> I realise now that "PEN" is probably wrong for point features, but it
>> should all be explained in the google OGR style docs:
>>
>> https://www.gdal.org/ogr_feature_style.html
>>
>> and in the links in that GIS stack exchange question...
>>
>> Barry
>>
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>>
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>
>
>

-- 
Marta M. Rufino (auxiliary researcher)

*____________________________________________________*MARE - Marine and
Environmental Sciences Centre
Faculty of Sciences, University of Lisbon
Campo Grande, 1749-016 Lisboa,
Portugal
Tel: + 351 21 750 00 00, extension: 22576

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