Create index.md

huanglii · huanglii · commit 4df748f83836 · 2025-03-10T16:04:37.000+08:00
diff --git a/docs/Python/TiTiler/index.md b/docs/Python/TiTiler/index.md
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+# TiTiler
+
+[TiTiler](https://developmentseed.org/titiler/): A modern dynamic tile server built on top of FastAPI and Rasterio/GDAL.
+
+## /cog
+
+### colormap
+
+#### 离散
+
+```js
+const colormap = encodeURIComponent(
+  JSON.stringify({
+    0: "#f00",
+    1: "#0f0",
+    2: "#00f",
+  })
+);
+```
+
+#### 线性
+
+```js
+// 从 0 到 255 的 256 个值
+const linearColors: Record<number, string> = {};
+for (let i = 0; i < 256; i++) {
+  colormap[i] = `#${i.toString(16).padStart(2, "0")}0000`;
+}
+
+colormap = encodeURIComponent(JSON.stringify(linearColors));
+```
+
+#### 区间
+
+```js
+const colormap = JSON.stringify([
+  // [[min, max], [r, g, b, a]]
+  [[0, 40], "#FF0000"],
+  [
+    [40, 200],
+    [0, 255, 0, 255],
+  ],
+  [
+    [200, 255],
+    [0, 0, 255, 255],
+  ],
+]);
+```
