Remove filters.hag. (#3176)

* Remove filters.hag. * Replaced old HAG filter doc.
PDAL · Jul 16, 2020 · a12f775 · a12f775
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diff --git a/doc/pipeline.rst b/doc/pipeline.rst
@@ -321,7 +321,7 @@ code at `hag.py`_.
 
 .. seealso::
 
-    :ref:`filters.hag` describes using a specific filter to do
+    :ref:`filters.hag_nn` describes using a specific filter to do
     this job in more detail.
 
 .. code-block:: json

diff --git a/doc/stages/filters.hag.rst b/doc/stages/filters.hag.rst
@@ -5,7 +5,7 @@ filters.hag
 
 .. warning::
 
-    The HAG filter is deprecated and has been replaced by :ref:`filters.hag_nn`,
+    The HAG filter has been eliminated was replaced by :ref:`filters.hag_nn`,
     :ref:`filters.hag_dem` and :ref:`filters.hag_delaunay`.  Please use
     the new filter
     that matches your needs as this filter will be removed in a future release.

diff --git a/doc/stages/filters.head.rst b/doc/stages/filters.head.rst
@@ -47,7 +47,7 @@ Compute height above ground and extract the ten highest points.
           "type":"filters.smrf"
       },
       {
-          "type":"filters.hag"
+          "type":"filters.hag_nn"
       },
       {
           "type":"filters.sort",

diff --git a/doc/stages/filters.rst b/doc/stages/filters.rst
@@ -98,15 +98,10 @@ Height Above Ground
    :glob:
    :hidden:
 
-   filters.hag
    filters.hag_delaunay
    filters.hag_dem
    filters.hag_nn
 
-:ref:`filters.hag`
-    Deprecated. Use :ref:`filters.hag_delaunay`, :ref:`filters.hag_dem`, or
-    :ref:`filters.hag_nn`.
-
 :ref:`filters.hag_delaunay`
     Compute pointwise height above ground using triangulation. Requires points to
     classified as ground/non-ground prior to estimating.

diff --git a/doc/workshop/capstone.rst b/doc/workshop/capstone.rst
@@ -41,7 +41,7 @@ Given the following pipeline for fetching the data, complete the rest of the tas
 * Thin it by 1.0 meter spacing using :ref:`filters.sample` (See :ref:`workshop-thinning`)
 * Filter out noise using :ref:`filters.outlier` (See :ref:`workshop-denoising`)
 * Classify ground points using :ref:`filters.smrf` (See :ref:`workshop-ground`)
-* Compute height above ground using :ref:`filters.hag`
+* Compute height above ground using :ref:`filters.hag_nn`
 * Generate a digital terrain model (DTM) using :ref:`writers.gdal` (See :ref:`workshop-dtm`)
 * Generate a average vegetative height model using :ref:`writers.gdal`
 

diff --git a/doc/workshop/slides/source/pdal_intro.rst b/doc/workshop/slides/source/pdal_intro.rst
@@ -132,7 +132,7 @@ Filters (cont)
 ================================================================================
 
 * :ref:`Ground classification<filters.smrf>`
-* :ref:`Normalized heights <filters.hag>`
+* :ref:`Normalized heights <filters.hag_nn>`
 * :ref:`Sorting <filters.sort>`
 * :ref:`Spatial curve sorting <filters.mortonorder>`
 * :ref:`Noise filtering <filters.outlier>`

diff --git a/filters/HAGFilter.cpp b/filters/HAGFilter.cpp