Do I really need to do all the map projections that follow? all the grid systems that follow?

Remember that the purpose of the metadata standards is to allow the description of data sets. The standards provide explicit means to encode parameters for map projections and grid systems that are commonly used in the United States, as well as the means to develop encodings of parameters for map projections and grid systems that you use in your data sets. The rest of the map projections and grid systems don't apply to you; ignore them.

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