Support for Symbology

[defuneste]

Currently the tool seems great to interact with data but has no support for symbology (or did I miss it?).

Will it be possible to:

1. access shapefile and/or file geodatabase symbology
2. set it if needed

Describe the solution you'd like
No specific idea on how it could be implemented. It could be a new function or it could be part of get_layer() family functions.

[elipousson]

For MapServer layers, the data on default rendering rules is included in the metadata loaded when you access a layer with arc_open() but I'm not sure whether the existing functions could support updating that data or not. Reprex below for reference.

Likely outside the scope of this package, but I've been thinking that some translator that can switch from this ArcGIS style specification, the QSS file format used by QGIS, and a {ggplot2} aesthetic mapping could be a handy utility.

library(arcgislayers)

url <- "https://geodata.baltimorecity.gov/egis/rest/services/CitiMap/DOT_Layers/MapServer/5"

data <- arc_open(url)

str(data$drawingInfo$renderer)
#> List of 8
#>  $ type            : chr "uniqueValue"
#>  $ field1          : chr "FAC_TYPE"
#>  $ field2          : NULL
#>  $ field3          : NULL
#>  $ defaultSymbol   : NULL
#>  $ defaultLabel    : NULL
#>  $ uniqueValueInfos:'data.frame':    8 obs. of  4 variables:
#>   ..$ symbol     :List of 8
#>   .. ..$ :List of 4
#>   .. .. ..$ type : chr "esriSLS"
#>   .. .. ..$ style: chr "esriSLSSolid"
#>   .. .. ..$ color: int [1:4] 112 168 0 255
#>   .. .. ..$ width: num 2.25
#>   .. ..$ :List of 4
#>   .. .. ..$ type : chr "esriSLS"
#>   .. .. ..$ style: chr "esriSLSSolid"
#>   .. .. ..$ color: int [1:4] 0 0 0 0
#>   .. .. ..$ width: int 0
#>   .. ..$ :List of 4
#>   .. .. ..$ type : chr "esriSLS"
#>   .. .. ..$ style: chr "esriSLSSolid"
#>   .. .. ..$ color: int [1:4] 112 168 0 255
#>   .. .. ..$ width: int 2
#>   .. ..$ :List of 4
#>   .. .. ..$ type : chr "esriSLS"
#>   .. .. ..$ style: chr "esriSLSSolid"
#>   .. .. ..$ color: int [1:4] 76 230 0 255
#>   .. .. ..$ width: num 1.5
#>   .. ..$ :List of 4
#>   .. .. ..$ type : chr "esriSLS"
#>   .. .. ..$ style: chr "esriSLSSolid"
#>   .. .. ..$ color: int [1:4] 0 230 169 255
#>   .. .. ..$ width: num 3.75
#>   .. ..$ :List of 4
#>   .. .. ..$ type : chr "esriSLS"
#>   .. .. ..$ style: chr "esriSLSSolid"
#>   .. .. ..$ color: int [1:4] 230 152 0 255
#>   .. .. ..$ width: num 2.25
#>   .. ..$ :List of 4
#>   .. .. ..$ type : chr "esriSLS"
#>   .. .. ..$ style: chr "esriSLSDash"
#>   .. .. ..$ color: int [1:4] 0 115 76 255
#>   .. .. ..$ width: num 0.4
#>   .. ..$ :List of 4
#>   .. .. ..$ type : chr "esriSLS"
#>   .. .. ..$ style: chr "esriSLSSolid"
#>   .. .. ..$ color: int [1:4] 76 115 0 255
#>   .. .. ..$ width: int 2
#>   ..$ value      : chr [1:8] "BIKE BOULEVARD" "BIKE LANE" "CONTRAFLOW" "SHARE THE ROAD" ...
#>   ..$ label      : chr [1:8] "BIKE BOULEVARD" "BIKE LANE" "CONTRAFLOW" "SHARE THE ROAD" ...
#>   ..$ description: chr [1:8] "" "" "" "" ...
#>  $ fieldDelimiter  : chr ","

^{Created on 2023-11-29 with reprex v2.0.2}

[JosiahParry]

Message from LinkedIn user wants to use symbology json to create a lyr or a qml.

[elipousson]

A couple relevant projects and examples:

• https://github.com/snorfalorpagus/avl2qml: Python module for converting ArcView 3.x Legends (.avl) to QGIS styles (.qml).
• https://github.com/arc2qgis/lyrxtoqml: This project enables using ArcGIS Pro symbology files (.lyrx) directly in QGIS.
• https://github.com/north-road/slyr: A QGIS plugin for extraction, parsing, and conversion of ESRI .lyr, .mxd and .style files.
• https://github.com/geostyler/geostyler-lyrx-parser: Geostyler Style Parser for ArcGIS Pro layer file format .lyrx
• https://github.com/camptocamp/lyrx2sld: Conversion of ArcGIS Pro styling to GeoServer using bridge-style