From 3e8ce840c70ee00925210b96738696d1dc445f8f Mon Sep 17 00:00:00 2001
From: Rutger Broekhoff
Date: Tue, 8 Sep 2026 01:36:38 +0200
Subject: UTM projection

---
 server/src/gpx.cpp | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

(limited to 'server/src/gpx.cpp')

diff --git a/server/src/gpx.cpp b/server/src/gpx.cpp
index 078248f..2193e6a 100644
--- a/server/src/gpx.cpp
+++ b/server/src/gpx.cpp
@@ -22,7 +22,7 @@ auto qname(std::string_view local) -> xml::qname_view
 }
 
 auto parse_wpt(xml::executor_ref e, xml::attribute_view attrs)
-    -> xml::parser<geo::point>
+    -> xml::parser<geo::utm::zonable_wgs84_point>
 {
   auto parse_xml_double = [](std::string_view sv) -> std::optional<double>
   { return util::parse_double(sv, std::chars_format::fixed); };
@@ -43,8 +43,12 @@ auto parse_wpt(xml::executor_ref e, xml::attribute_view attrs)
     throw std::runtime_error{
       "expected valid latitude and longitude for waypoint"
     };
+  auto mp = geo::utm::zonable_wgs84_point::from(
+      geo::wgs84::normalized_point{geo::wgs84::from_lat_lon(*mlat, *mlon)});
+  if (!mp)
+    throw std::runtime_error{"expected waypoint to be within UTM range"};
   co_await xml::ignore_contents(e);
-  co_return geo::point{*mlon, *mlat};
+  co_return *mp;
 }
 
 auto parse_trkseg(xml::executor_ref e, xml::attribute_view)
@@ -121,7 +125,7 @@ auto parse_metadata(xml::executor_ref e, xml::attribute_view)
 }
 
 auto parse_wpt(xml::executor_ref e, xml::attribute_view attrs)
-    -> xml::parser<geo::point>
+    -> xml::parser<geo::utm::zonable_wgs84_point>
 {
   auto parse_xml_double = [](std::string_view sv) -> std::optional<double>
   { return util::parse_double(sv, std::chars_format::fixed); };
@@ -142,8 +146,12 @@ auto parse_wpt(xml::executor_ref e, xml::attribute_view attrs)
     throw std::runtime_error{
       "expected valid latitude and longitude for waypoint"
     };
+  auto mp = geo::utm::zonable_wgs84_point::from(
+      geo::wgs84::normalized_point{geo::wgs84::from_lat_lon(*mlat, *mlon)});
+  if (!mp)
+    throw std::runtime_error{"expected waypoint to be within UTM range"};
   co_await xml::ignore_contents(e);
-  co_return geo::point{*mlon, *mlat};
+  co_return *mp;
 }
 
 auto parse_trkseg(xml::executor_ref e, xml::attribute_view)
-- 
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