Gaussian low pass filter window size

Airborne LiDAR DSM

DTM from filter 3 × 3

DTM from filter 7 × 7

DTM from filter 15 × 15

DTM from filter 21 × 21

DTM from filter 25 × 25

DTM from filter 31 × 31

DTM from filter 35 × 35

DTM from filter 41 × 41

Statistical quantity

Min. (m)

165.259

165.858

182.825

223.183

236.151

242.958

245.415

245.517

245.644

Max. (m)

292.764

291.445

289.265

289.079

287.991

286.884

285.822

284.944

283.984

Range (m)

127.504

125.588

106.440

65.896

51.840

43.926

40.408

39.426

38.339

Mean (m)

265.289

265.289

265.289

265.289

265.289

265.289

265.290

265.290

265.290

Median (m)

265.381

265.393

265.455

265.550

265.606

265.654

265.689

265.710

265.746

Root Mean Square (m)

265.425

265.425

265.423

265.419

265.417

265.415

265.413

265.412

265.411

Standard Deviation (m)

8.487

8.468

8.406

8.297

8.223

8.156

8.097

8.062

8.015

Skewness (m)

−0.318

−0.321

−0.332

−0.354

−0.372

−0.387

−0.401

−0.408

−0.417

Kurtosis (m)

2.595

2.585

2.524

2.464

2.444

2.428

2.414

2.405

2.394