Table 4 The Eigenvector matrix values of bands, band ratio indices, and Relative Band Depths utilized for DPCA using the four datasets to highlight various alteration types.

From: Towards better delineation of hydrothermal alterations via multi-sensor remote sensing and airborne geophysical data

Hydroxyl-bearing minerals

Eigenvector (ASTER)

B1

B3

B4

B7

DPCA 1

− 0.75661

− 0.63646

− 0.14441

− 0.04012

DPCA 2

− 0.6277

0.642843

0.419598

0.129167

DPCA 3

− 0.18274

0.425821

− 0.86022

− 0.21286

DPCA 4

0.01222

− 0.01853

− 0.25122

0.967676

Eigenvector (S2)

B2

B8a

B11

B12

DPCA 1

− 0.2338

− 0.49105

− 0.61177

− 0.57441

DPCA 2

− 0.69378

− 0.51409

0.290978

0.411961

DPCA 3

− 0.68009

0.68397

− 0.04489

− 0.26009

DPCA 4

− 0.03857

0.163603

− 0.73421

0.65779

Eigenvector (L8)

B2

B5

B6

B7

DPCA 1

0.18568

0.510246

0.630871

0.554232

DPCA 2

0.501779

0.677057

− 0.30644

− 0.44261

DPCA 3

0.390401

− 0.12282

− 0.61093

0.677691

DPCA 4

0.749219

− 0.51591

0.367229

− 0.19405

Eigenvector (ALI)

B2

B6

B8

B9

DPCA 1

− 0.20929

− 0.43703

− 0.64853

− 0.58704

DPCA 2

− 0.63163

− 0.61918

0.290954

0.364706

DPCA 3

0.018854

0.071684

− 0.69859

0.711673

DPCA 4

− 0.74625

0.648453

− 0.08204

− 0.12607

Iron oxides

Eigenvector (ASTER)

B1

B2

B3

B4

DPCA 1

0.567561

0.660388

0.479535

0.108667

DPCA 2

0.715437

− 0.138838

− 0.569369

− 0.380385

DPCA 3

0.293986

− 0.282978

− 0.161860

0.898497

DPCA 4

− 0.282127

0.681568

− 0.647817

0.190268

Eigenvector (S2)

B2

B4

B8a

B11

DPCA 1

0.265453

0.498315

0.529967

0.632734

DPCA 2

0.493719

0.511591

0.102312

− 0.69574

DPCA 3

0.586513

0.04036

− 0.73503

0.337798

DPCA 4

0.584618

− 0.6988

0.410368

− 0.03864

Eigenvector (L8)

B2

B4

B5

B6

DPCA 1

0.206659

0.455838

0.554507

0.664850

DPCA 2

0.388539

0.477569

0.323917

− 0.718362

DPCA 3

0.778045

0.071257

− 0.590603

0.201883

DPCA 4

− 0.448303

0.747705

− 0.488660

0.034262

Eigenvector (ALI)

B2

B4

B6

B8

DPCA 1

0.238313

0.483415

0.482739

0.690275

DPCA 2

0.412695

0.523427

0.267211

− 0.69592

DPCA 3

0.768503

− 0.04186

− 0.60948

0.190231

DPCA 4

− 0.42696

0.700415

− 0.5693

0.055022

Ferric/ferrous iron oxides, Al/Fe–OH, and Mg–Fe–OH bearing minerals

Eigenvector (ASTER)

B2/B1(ferrous)

B4/B2 (ferric)

((B7 + B9)/B8) Mg–Fe–OH

((B5 + B7)/B6) Al/Fe–OH

DPCA 1

0.000343

0.000055

− 0.70566

0.708556

DPCA 2

− 0.00023

0.000046

0.708556

0.705655

DPCA 3

0.999274

0.038094

0.000405

− 0.000084

DPCA 4

0.038094

− 0.99927

0.000009

0.000069

Eigenvector (S2)

B4/B2 (iron oxides)

B11/B4 (ferrous)

B11/B8a (ferric)

B11/B12 (OH)

DPCA 1

0.283757

0.8326

0.474493

− 0.0334

DPCA 2

0.946776

− 0.17216

− 0.26754

− 0.04896

DPCA 3

0.076989

− 0.06169

0.131627

0.986378

DPCA 4

0.131033

− 0.52281

0.828223

− 0.15344

Eigenvector (L8)

B4/B2 (iron oxides)

B6/B4 (ferrous)

B6/B5 (ferric)

B6/B7 (OH)

DPCA 1

− 9.999

− 0.00275

− 0.00097

− 0.000032

DPCA 2

0.00286

− 0.86436

− 0.50152

0.036844

DPCA 3

− 0.00012

0.014032

0.049184

0.998691

DPCA 4

0.000543

− 0.50268

0.863746

− 0.03548

Eigenvector (ALI)

B4/B2 (iron oxides)

B8/B4 (ferrous)

B8/B6 (ferric)

B8/B9 (OH)

DPCA 1

− 0.00176

0.072038

0.9974

0.000685

DPCA 2

0.001892

− 0.9974

0.072042

− 0.00029

DPCA 3

− 0.00933

− 0.00035

− 0.00068

0.999956

DPCA 4

0.999953

0.002011

0.001617

0.009327

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