# Data fetched via HTTP from ['ftp://ftp.ngdc.noaa.gov/geomag/wmm/wmm2020/shapefiles/2023/WMM_2023_all_shape_geographic.zip'] # Data processed using the following steps: unzip -j -d {output_dir} {input_dir}/WMM_2023_all_shape_geographic.zip *D_SV_2023* OGR_ENABLE_PARTIAL_REPROJECTION=TRUE ogr2ogr -lco ENCODING=UTF-8 -t_srs EPSG:3413 -clipdst {assets_dir}/latitude_shape_40_degrees.geojson -dialect sqlite -sql "Select Geometry, Contour, SIGN, \"INDEX\", CAST(Contour AS TEXT) || \" ''/y\" as label FROM D_SV_2023" {output_dir}/D_SV_2023.gpkg {input_dir}/D_SV_2023.shp