From 788de853dc67e3ae3562b2957436df3bd2eec266 Mon Sep 17 00:00:00 2001
From: Philip Sargent <philip.sargent@gmail.com>
Date: Fri, 27 Oct 2023 22:13:14 +0300
Subject: ported radosts SRTM altitude tool

---
 core/models/survex.py | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

(limited to 'core/models/survex.py')

diff --git a/core/models/survex.py b/core/models/survex.py
index da35336..7af8570 100644
--- a/core/models/survex.py
+++ b/core/models/survex.py
@@ -1,3 +1,4 @@
+import math 
 import os
 import re
 from urllib.parse import urljoin
@@ -6,7 +7,7 @@ from pathlib import Path
 from django.conf import settings
 from django.db import models
 from django.urls import reverse
-
+from troggle.core.utils import height_from_utm
 
 # from troggle.core.models.troggle import DataIssue # circular import. Hmm
 
@@ -72,7 +73,23 @@ class SurvexStation(models.Model):
         return utmToLatLng(33, self.x, self.y, northernHemisphere=True)[0]
     def long(self):
         return utmToLatLng(33, self.x, self.y, northernHemisphere=True)[1]
-import math
+        
+    def srtm_alt(self):
+        return height_from_utm(self.x, self.y) # height, distance from reference point
+ 
+    def srtm_diff(self):
+        alt, ref = height_from_utm(self.x, self.y) # height, distance from reference point
+        
+        diff = alt - self.z
+        if diff >= 0:
+            diff_str = f"<span style='color:blue'>+{diff:.0f}</span>"
+        else:
+            diff_str = f"<span style='color:red'>{diff:.0f}</span>"
+       
+        return diff_str, ref
+ 
+        
+    
 
 def utmToLatLng(zone, easting, northing, northernHemisphere=True): # move this to utils.py ?
     if not northernHemisphere:
-- 
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