Replacing a liner in a 16x32' inground pool

[DIYLINER]

pool chart data processed . . . .

Thanks...question regarding the pool chart data...I can't access it
On different pool volume calculators my pool volume always came out around 19,000g....which I thought was high
Mainly due to the way my pool is formed...sides that slope in etc
I always thought I could have a more accurate volume with something like autocad
Does the pool chart use a more accurate calculator ? ---since I *think* my signature volume was update to 16,600 g
Thanks !
-Dave