ArcGIS REST Services Directory
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elevation/WGS84_to_EGM2008 (ImageServer)

{"statistics": [{
 "min": -106.90899658203125,
 "max": 85.82398223876953,
 "mean": -1.3212732177781548,
 "standardDeviation": 29.24592934918173,
 "skipX": 1,
 "skipY": 1,
 "count": 0
}]}