Fix typos OGC:WGS84 to OGC:CRS84

[seisman]

There is no OGC:WGS84, only OGC:CRS84. This PR fixes the typos.

@weiji14 Are there any specific reasons that we use "OGC:CRS84", not EPSG:4326?

ChatGPT tells me:

The difference between OGC:CRS84 and EPSG:4326 lies in the order of their coordinate axes, even though both reference the same geographic coordinate system (WGS 84).

Key Differences:

1. Coordinate Order:

   • OGC:CRS84: The order of coordinates is longitude, latitude (X, Y).
   • EPSG:4326: The order of coordinates is latitude, longitude (Y, X).

2. Origin and Usage:

   • OGC:CRS84: Defined by the Open Geospatial Consortium (OGC) and primarily used in GeoJSON and other web mapping standards.
   • EPSG:4326: Defined by the EPSG registry and widely used in GIS software and spatial databases.

3. Use Cases:

   • OGC:CRS84 is commonly used in web applications (e.g., GeoJSON), where the convention follows the Cartesian coordinate system's ordering (X, Y).
   • EPSG:4326 is used in traditional GIS applications and standards, aligning with the geographic convention of latitude before longitude (Y, X).

Practical Implications:

• When working with data, it's crucial to respect the coordinate order expected by the software or standard you’re using.
• Interoperability: If you interchange data between systems expecting different orders (e.g., GeoJSON vs. a GIS application), you might need to swap the coordinate values.

Visual Comparison:

If a point is located at 40° latitude and -75° longitude:

• OGC:CRS84: [-75.0, 40.0] (longitude, latitude)
• EPSG:4326: [40.0, -75.0] (latitude, longitude)

Despite the axis order difference, the spatial reference system and geodetic model (WGS 84) are identical for both.

[github-actions]

Summary of changed images

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Status	Path
renamed	pygmt/tests/baseline/test_tilemap_ogc_wgs84.png -> pygmt/tests/baseline/test_tilemap_ogc_crs84.png

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Report last updated at commit 5e16a3f

[weiji14]

@weiji14 Are there any specific reasons that we use "OGC:CRS84", not EPSG:4326?

Yes, it is the difference between lon/lat and lat/lon order. A lot of GIS software has been lenient around EPSG:4326 for lon/lat data because so many people use it that way, but it is technically wrong, and I think PROJ and other libraries will slowly become more stricter on this - e.g.:

• Eliminate much to_epsg() usage and speed up __eq__() rasterio/rasterio#3216 (comment)
• Should we recommend EPSG:4326 or something else? opengeospatial/geoparquet#52 (comment)