Steps to switch a 0-degree meridinal map to 180-degree meridinal

steps

Note: These instructions assume the extent is -180 - 180, and -90 - 90. Use gdalinfo to check beforehand. They also assume our spatial file is longlat-projected.

For raster:

1. Grab a raster file
2. Decide upon how we'd like to trim. Below, we trim to -180:-120x30:90 and then 120:180x30:90
2. Trim: gdalwarp -te -180 30 -120 90 {SPATIAL_FILE_PATH} {OUTPUT_FILE_PATH}
3. Trim: gdalwarp -te 120 30 180 90 {SPATIAL_FILE_PATH} {OUTPUT_FILE_PATH}
4. Reproject: gdaltransform -s_srs '+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs' -t_srs '+proj=longlat +ellps=WGS84 +pm=360 +datum=WGS84 +no_defs'

For vector:

ogr2ogr -clipsrc -180 0 -100 90 ne_10m_coastline_right.shp ne_10m_coastline.shp
ogr2ogr -clipsrc 100 0 180 90 ne_10m_coastline_left.shp ne_10m_coastline.shp
ogr2ogr output.shp -t_srs "EPSG:4326" input.shp
ogr2ogr merged.shp ne_10m_coastline_right.shp