Add io-bii colormap (#159)

* feat: io-bii colormap

* fix: apply format

pctiler/pctiler/colormaps/__init__.py

@@ -8,6 +8,7 @@
 
 from .alos_palsar_mosaic import alos_palsar_mosaic_colormaps
 from .chloris import chloris_colormaps
+from .io_bii import io_bii_colormaps
 from .jrc import jrc_colormaps
 from .lidarusgs import lidar_colormaps
 from .lulc import lulc_colormaps
@@ -24,6 +25,7 @@
 ################################################################################
 registered_cmaps = cmap
 custom_colormaps: Dict[str, ColorMapType] = {
+    **io_bii_colormaps,
     **jrc_colormaps,
     **lulc_colormaps,
     **modis_colormaps,

pctiler/pctiler/colormaps/io_bii.py

@@ -0,0 +1,32 @@
+from typing import Dict, cast
+
+import matplotlib
+import numpy as np
+from rio_tiler.types import ColorMapType, ColorTuple
+
+
+def make_io_bii_colormap() -> ColorMapType:
+    io_bii = matplotlib.colors.LinearSegmentedColormap.from_list(
+        "io_bii",
+        [
+            (0.0, "#72736c"),
+            (0.2, "#ccd3c5"),
+            (0.4, "#cceaa2"),
+            (0.6, "#69be72"),
+            (0.8, "#309d53"),
+            (1.0, "#006a37"),
+        ],
+        256,
+    )
+    ramp = np.linspace(0, 1, 256)
+    cmap_vals = io_bii(ramp)[:, :]
+    cmap_uint8 = (cmap_vals * 255).astype("uint8")
+    colormap = {
+        idx: cast(ColorTuple, tuple(value)) for idx, value in enumerate(cmap_uint8)
+    }
+    return colormap
+
+
+io_bii_colormaps: Dict[str, ColorMapType] = {
+    "io-bii": make_io_bii_colormap(),
+}