Add chloris-biomass rendering config (#27)

pccommon/render.py

@@ -77,6 +77,15 @@ COLLECTION_RENDER_CONFIG = {
         mosaic_preview_coords=[37.2141, -104.2947],
         minzoom=9,
     ),
+    "chloris-biomass": DefaultRenderConfig(
+        assets=["data"],
+        render_params={"colormap_name": "chloris-biomass", "rescale": [1, 750000]},
+        has_mosaic=False,
+        mosaic_preview_zoom=2,
+        mosaic_preview_coords=[30.0572, 80.1735],
+        requires_token=True,
+        minzoom=2,
+    ),
     "cop-dem-glo-30": DefaultRenderConfig(
         assets=["data"],
         render_params={"colormap_name": "terrain", "rescale": [-1000, 4000]},

pctiler/pctiler/colormaps/__init__.py

@@ -6,6 +6,7 @@ from rio_tiler.colormap import cmap
 from rio_tiler.types import ColorMapType
 from titiler.core.dependencies import ColorMapParams
 
+from .chloris import chloris_colormaps
 from .jrc import jrc_colormaps
 from .lulc import lulc_colormaps
 from .mtbs import mtbs_colormaps
@@ -20,6 +21,7 @@ custom_colormaps: Dict[str, ColorMapType] = {
     **jrc_colormaps,
     **lulc_colormaps,
     **mtbs_colormaps,
+    **chloris_colormaps,
 }
 
 for k, v in custom_colormaps.items():

pctiler/pctiler/colormaps/chloris.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_biomass_colormap() -> ColorMapType:
+    biomass = matplotlib.colors.LinearSegmentedColormap.from_list(
+        "chloris-biomass",
+        [
+            "#c6c875",
+            "#77a865",
+            "#3d8757",
+            "#29583a",
+            "#2e3926",
+            "#050603",
+        ],
+        256,
+    )
+    ramp = np.linspace(0, 1, 256)
+    cmap_vals = biomass(ramp)[:, :]
+    cmap_uint8 = (cmap_vals * 255).astype("uint8")
+    colormap = {
+        idx: cast(ColorTuple, tuple(value)) for idx, value in enumerate(cmap_uint8)
+    }
+    return colormap
+
+
+chloris_colormaps: Dict[str, ColorMapType] = {
+    "chloris-biomass": make_biomass_colormap(),
+}