Table:
Data	Footprint	Detects	Number	Symbol
ICESat	point	fine scale, surface, firn, ice processes and GIA	193 914	zI
EnviSat	point	fine scale, surface, firn, ice processes and GIA	164 551	zE
GRACE	polar polygons (≈ 40 000 km2)	surface, ice processes and GIA	2832	zG
GPS	point	GIA	147	zGPS

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| Data | Footprint | Detects | Number | Symbol | 
 | --- | --- | --- | --- | --- | 
 | ICESat | point | fine scale, surface, firn, ice processes and GIA | 193 914 | zI | 
 | EnviSat | point | fine scale, surface, firn, ice processes and GIA | 164 551 | zE | 
 | GRACE | polar polygons (≈ 40 000 km2) | surface, ice processes and GIA | 2832 | zG | 
 | GPS | point | GIA | 147 | zGPS |