geotiffjs · zakjan · Sep 15, 2025 · Sep 15, 2025 · Sep 15, 2025
diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
@@ -82,7 +82,6 @@
     "node": ">=10.19"
   },
   "dependencies": {
-    "@petamoriken/float16": "^3.4.7",
     "lerc": "^3.0.0",
     "pako": "^2.0.4",
     "parse-headers": "^2.0.2",

diff --git a/src/dataview64.js b/src/dataview64.js
@@ -1,5 +1,3 @@
-import { getFloat16 } from '@petamoriken/float16';
-
 export default class DataView64 {
   constructor(arrayBuffer) {
     this._dataView = new DataView(arrayBuffer);
@@ -84,7 +82,7 @@ export default class DataView64 {
   }
 
   getFloat16(offset, littleEndian) {
-    return getFloat16(this._dataView, offset, littleEndian);
+    return this._dataView.getFloat16(offset, littleEndian);
   }
 
   getFloat32(offset, littleEndian) {

diff --git a/src/geotiffimage.js b/src/geotiffimage.js
@@ -1,5 +1,4 @@
 /** @module geotiffimage */
-import { getFloat16 } from '@petamoriken/float16';
 import getAttribute from 'xml-utils/get-attribute'; // eslint-disable-line import/extensions
 import findTagsByName from 'xml-utils/find-tags-by-name'; // eslint-disable-line import/extensions
 
@@ -65,6 +64,10 @@ function arrayForType(format, bitsPerSample, size) {
     case 3: // floating point data
       switch (bitsPerSample) {
         case 16:
+          // Float16Array is supported since eslint 9.29.0, see https://eslint.org/blog/2025/06/eslint-v9.29.0-released/
+          // but eslint can't be updated to 9.x.x, because eslint-config-airbnb-base supports up to eslint 8.x.x only
+          // eslint-disable-next-line no-undef
+          return new Float16Array(size);
         case 32:
           return new Float32Array(size);
         case 64:
@@ -155,16 +158,6 @@ function normalizeArray(inBuffer, format, planarConfiguration, samplesPerPixel,
         // bitOffset = bitOffset + pixelBitSkip - bitsPerSample;
       }
     }
-  } else if (format === 3) { // floating point
-    // Float16 is handled elsewhere
-    // normalize 16/24 bit floats to 32 bit floats in the array
-    // console.time();
-    // if (bitsPerSample === 16) {
-    //   for (let byte = 0, outIndex = 0; byte < inBuffer.byteLength; byte += 2, ++outIndex) {
-    //     outArray[outIndex] = getFloat16(view, byte);
-    //   }
-    // }
-    // console.timeEnd()
   }
 
   return outArray.buffer;
@@ -320,9 +313,7 @@ class GeoTIFFImage {
       case 3:
         switch (bitsPerSample) {
           case 16:
-            return function (offset, littleEndian) {
-              return getFloat16(this, offset, littleEndian);
-            };
+            return DataView.prototype.getFloat16;
           case 32:
             return DataView.prototype.getFloat32;
           case 64:

diff --git a/test/data/.gitignore b/test/data/.gitignore
@@ -1,4 +1,5 @@
 *zip*
 *tif*
+*cog*
 *html
 *xml
diff --git a/test/data/setup_data.sh b/test/data/setup_data.sh
@@ -1,4 +1,8 @@
 set -e
+
+# uncomment to create test data in Docker, GDAL on MacOS installed via Homebrew doesn't have LERC
+# alias gdal_translate="docker run -v .:/data -w /data ghcr.io/osgeo/gdal:alpine-small-latest gdal_translate"
+
 wget https://github.com/EOxServer/autotest/raw/f8d9f4bde6686abbda09c711d4bf5239f5378aa9/autotest/data/meris/MER_FRS_1P_reduced/ENVISAT-MER_FRS_1PNPDE20060816_090929_000001972050_00222_23322_0058_uint16_reduced_compressed.tif -O initial.tiff
 wget https://github.com/EOxServer/autotest/raw/f8d9f4bde6686abbda09c711d4bf5239f5378aa9/autotest/data/meris/mosaic_MER_FRS_1P_RGB_reduced/mosaic_ENVISAT-MER_FRS_1PNPDE20060816_090929_000001972050_00222_23322_0058_RGB_reduced.tif -O rgb.tiff
 wget https://raw.githubusercontent.com/hubmapconsortium/portal-containers/master/containers/ome-tiff-offsets/test-input/multi-channel.ome.tif -O multi-channel.ome.tif
@@ -7,6 +11,7 @@ gdal_translate -of GTiff initial.tiff stripped.tiff
 gdal_translate -of GTiff -co TILED=YES -co BLOCKXSIZE=32 -co BLOCKYSIZE=32 stripped.tiff tiled.tiff
 gdal_translate -of GTiff -ot Int32 stripped.tiff int32.tiff
 gdal_translate -of GTiff -ot UInt32 stripped.tiff uint32.tiff
+gdal_translate -of GTiff -ot Float32 -co NBITS=16 stripped.tiff float16.tiff
 gdal_translate -of GTiff -ot Float32 stripped.tiff float32.tiff
 gdal_translate -of GTiff -ot Float64 stripped.tiff float64.tiff
 gdal_translate -of GTiff -co COMPRESS=LZW stripped.tiff lzw.tiff

diff --git a/test/geotiff.spec.js b/test/geotiff.spec.js
@@ -247,6 +247,14 @@ describe('GeoTIFF', () => {
     await performTiffTests(tiff, 539, 448, 15, Uint32Array);
   });
 
+  it('should work on Float16 tiffs', async () => {
+    const tiff = await GeoTIFF.fromSource(createSource('float16.tiff'));
+    // Float16Array is supported since eslint 9.29.0, see https://eslint.org/blog/2025/06/eslint-v9.29.0-released/
+    // but eslint can't be updated to 9.x.x, because eslint-config-airbnb-base supports up to eslint 8.x.x only
+    // eslint-disable-next-line no-undef
+    await performTiffTests(tiff, 539, 448, 15, Float16Array);
+  });
+
   it('should work on Float32 tiffs', async () => {
     const tiff = await GeoTIFF.fromSource(createSource('float32.tiff'));
     await performTiffTests(tiff, 539, 448, 15, Float32Array);
-Original file line number
+Diff line change
@@ -1,4 +1,5 @@
     *zip*
     *tif*
+    *cog*
     *html
     *xml