Does anyone know of a good guide to DEM (Digital Elevation Model) formats? New Zealand has some great open data[0], and I expect that it would be a fun exercise

Does anyone know of a good guide to DEM (Digital Elevation Model) formats? New Zealand has some great open data[0], and I expect that it would be a fun exercise to create your own elevation API from it but I don't know how to get started [0] http://koordinates.com/#/layer/1418-nz-80m-digital-elevation-model/ http://koordinates.com/#/layer/1418-nz-80m-digital-elevation...