Add BNDVI/NDRE spectral indices (#386)

tests/transforms/test_indices.py

@@ -8,9 +8,11 @@ import torch
 from torch import Tensor
 
 from torchgeo.transforms import (
+    AppendBNDVI,
     AppendGNDVI,
     AppendNBR,
     AppendNDBI,
+    AppendNDRE,
     AppendNDSI,
     AppendNDVI,
     AppendNDWI,
@@ -64,7 +66,17 @@ def test_append_index_batch(batch: Dict[str, Tensor]) -> None:
 
 @pytest.mark.parametrize(
     "index",
-    [AppendNBR, AppendNDBI, AppendNDSI, AppendNDVI, AppendNDWI, AppendSWI, AppendGNDVI],
+    [
+        AppendBNDVI,
+        AppendNBR,
+        AppendNDBI,
+        AppendNDRE,
+        AppendNDSI,
+        AppendNDVI,
+        AppendNDWI,
+        AppendSWI,
+        AppendGNDVI,
+    ],
 )
 def test_append_normalized_difference_indices(
     sample: Dict[str, Tensor], index: AppendNormalizedDifferenceIndex

torchgeo/transforms/__init__.py

@@ -4,9 +4,11 @@
 """TorchGeo transforms."""
 
 from .indices import (
+    AppendBNDVI,
     AppendGNDVI,
     AppendNBR,
     AppendNDBI,
+    AppendNDRE,
     AppendNDSI,
     AppendNDVI,
     AppendNDWI,
@@ -17,9 +19,11 @@ from .transforms import AugmentationSequential
 
 __all__ = (
     "AppendNormalizedDifferenceIndex",
+    "AppendBNDVI",
     "AppendGNDVI",
     "AppendNBR",
     "AppendNDBI",
+    "AppendNDRE",
     "AppendNDSI",
     "AppendNDVI",
     "AppendNDWI",

torchgeo/transforms/indices.py

@@ -201,3 +201,43 @@ class AppendGNDVI(AppendNormalizedDifferenceIndex):
             index_green: index of the Green band, e.g. B3 in Sentinel 2 imagery
         """
         super().__init__(index_a=index_nir, index_b=index_green)
+
+
+class AppendBNDVI(AppendNormalizedDifferenceIndex):
+    """Blue Normalized Difference Vegetation Index (BNDVI).
+
+    If you use this index in your research, please cite the following paper:
+
+    * https://doi.org/10.1016/S1672-6308(07)60027-4
+
+    .. versionadded:: 0.3
+    """
+
+    def __init__(self, index_nir: int, index_blue: int) -> None:
+        """Initialize a new transform instance.
+
+        Args:
+            index_nir: index of the NIR band, e.g. B8 in Sentinel 2 imagery
+            index_blue: index of the Blue band, e.g. B2 in Sentinel 2 imagery
+        """
+        super().__init__(index_a=index_nir, index_b=index_blue)
+
+
+class AppendNDRE(AppendNormalizedDifferenceIndex):
+    """Normalized Difference Red Edge Vegetation Index (NDRE).
+
+    If you use this index in your research, please cite the following paper:
+
+    * https://agris.fao.org/agris-search/search.do?recordID=US201300795763
+
+    .. versionadded:: 0.3
+    """
+
+    def __init__(self, index_nir: int, index_vre1: int) -> None:
+        """Initialize a new transform instance.
+
+        Args:
+            index_nir: index of the NIR band, e.g. B8 in Sentinel 2 imagery
+            index_vre1: index of the Red Edge band, B5 in Sentinel 2 imagery
+        """
+        super().__init__(index_a=index_nir, index_b=index_vre1)