From 55cc71ce28e77ee1308c127fbc03e3c69db6e65e Mon Sep 17 00:00:00 2001
From: Zach Sherman <19153455+zssherman@users.noreply.github.com>
Date: Fri, 13 Dec 2024 13:55:15 -0600
Subject: [PATCH] FIX: Update sigmet reader to handle 1byte kdp, that needs to
 be divided by wavelength. (#1707)

* FIX: Update sigmet reader to handle 1byte kdp, that needs to be divided
by wavelength.

* FIX: Weird style issues.

* Update pyart/io/_sigmetfile.pyx

* Update pyart/io/_sigmetfile.pyx

* FIX: ANother style fix and doc fix possibly.
---
 doc/environment.yml      | 1 -
 pyart/io/_sigmetfile.pyx | 7 ++++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/doc/environment.yml b/doc/environment.yml
index ab92bd8da4..3f9549d4fe 100644
--- a/doc/environment.yml
+++ b/doc/environment.yml
@@ -41,4 +41,3 @@ dependencies:
   - pip:
       - pooch
       - versioneer
-      - -e ..
diff --git a/pyart/io/_sigmetfile.pyx b/pyart/io/_sigmetfile.pyx
index c0f31f34e2..9b2faec92b 100644
--- a/pyart/io/_sigmetfile.pyx
+++ b/pyart/io/_sigmetfile.pyx
@@ -213,7 +213,12 @@ cdef class SigmetFile:
             prt_value = 1. / self.product_hdr['product_end']['prf']
             nyquist = wavelength_cm / (10000.0 * 4.0 * prt_value)
             data['WIDTH'] *= nyquist
-
+        # scale 1-byte KDP by the wavelength
+        if 'KDP' in self.data_type_names:
+            # The IRIS Programmer's Manual indicates 1-byte differential phase format
+            # data should be divided by the wavelength in cm (section 4.3.12).
+            wavelength_cm = self.product_hdr['product_end']['wavelength']
+            data['KDP'] /= wavelength_cm
         return data, metadata
 
     def _get_sweep(self, full_xhdr=False, raw_data=False):