From b3c7e481a82b2956e5e1e4a6c1e08ef86652e1b0 Mon Sep 17 00:00:00 2001
From: Matthias Mohr <webmaster@mamo-net.de>
Date: Mon, 30 Oct 2023 17:29:02 +0100
Subject: [PATCH] `array_interpolate_linear`: Apply interpolation also on NaN
 values.

---
 CHANGELOG.md                  | 1 +
 array_interpolate_linear.json | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87dbf987..2dc1e229 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- `array_interpolate_linear`: Apply interpolation also on NaN values.
 - `clip`: Throw an exception if min > max [#472](https://github.com/Open-EO/openeo-processes/issues/472)
 
 ### Fixed
diff --git a/array_interpolate_linear.json b/array_interpolate_linear.json
index 021522b0..e290652b 100644
--- a/array_interpolate_linear.json
+++ b/array_interpolate_linear.json
@@ -1,7 +1,7 @@
 {
     "id": "array_interpolate_linear",
     "summary": "One-dimensional linear interpolation for arrays",
-    "description": "Performs a linear interpolation for each of the no-data values (`null`) in the array given, except for leading and trailing no-data values.\n\nThe linear interpolants are defined by the array indices or labels (x) and the values in the array (y).",
+    "description": "Performs a linear interpolation for each of the NaN and no-data values (`null`) in the array given, except for leading and trailing NaN and no-data values.\n\nThe linear interpolants are defined by the array indices or labels (x axis) and the values in the array (y axis).",
     "categories": [
         "arrays",
         "math",
@@ -10,7 +10,7 @@
     "parameters": [
         {
             "name": "data",
-            "description": "An array of numbers and no-data values.\n\nIf the given array is a labeled array, the labels must have a natural/inherent label order and the process expects the labels to be sorted accordingly. This is the default behavior in openEO for spatial and temporal dimensions.",
+            "description": "An array of numbers (including NaN and ±infinity) and no-data values.\n\nIf the given array is a labeled array, the labels must have a natural/inherent label order and the process expects the labels to be sorted accordingly. This is the default behavior in openEO for spatial and temporal dimensions.",
             "schema": {
                 "type": "array",
                 "items": {
@@ -23,7 +23,7 @@
         }
     ],
     "returns": {
-        "description": "An array with no-data values being replaced with interpolated values. If not at least 2 numerical values are available in the array, the array stays the same.",
+        "description": "An array with NaN and no-data values being replaced with interpolated values. If not at least 2 numerical values are available in the array, the array stays the same.",
         "schema": {
             "type": "array",
             "items": {