support nodata parameter for tiling (#360)

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 
 - Added initial console log of application deploy version number read from `package.json`
+- Add support for `nodata` to tiling configurations.
 
 ## 5.0.2 - 2024-03-06
 

README.md

@@ -215,6 +215,7 @@ The configurations include:
   image to composite.
 - `colormap_name`: the colormap to use for mapping values (typically used for single band)
 - `rescale`: the rescale range to apply prior to color mapping (typically used for single band)
+- `nodata`: the nodata value to use, if not in image metadata
 
 ### Mosaic Tiling Configuration
 

src/utils/mapHelper.js

@@ -444,6 +444,9 @@ const constructSceneTilerParams = (collection) => {
   const assetBidx = parameters.bidx(tilerParams, collection, asset)
   if (assetBidx) params.push(assetBidx)
 
+  const nodata = parameters.nodata(tilerParams, collection)
+  if (nodata) params.push(nodata)
+
   const colorFormula = parameters.colorFormula(tilerParams, collection)
   if (colorFormula) params.push(colorFormula)
 
@@ -481,6 +484,10 @@ const constructSceneAssetsParam = (collection, tilerParams) => {
 }
 
 const parameters = {
+  nodata: (tilerParams, collection) => {
+    const value = tilerParams[collection]?.nodata
+    return value == null ? null : `nodata=${value}`
+  },
   colorFormula: (tilerParams, collection) => {
     const value = tilerParams[collection]?.color_formula
     return value && `color_formula=${value}`
@@ -540,6 +547,9 @@ export const constructMosaicTilerParams = (collection) => {
   const bidx = parameters.bidx(tilerParams, collection)
   if (bidx) params.push(bidx)
 
+  const nodata = parameters.nodata(tilerParams, collection)
+  if (nodata) params.push(nodata)
+
   const colorFormula = parameters.colorFormula(tilerParams, collection)
   if (colorFormula) params.push(colorFormula)