now outputs lat+lon onto /l/*.html page for a photo with GPS exif

core/views/editor_helpers.py

@@ -126,7 +126,7 @@ def extract_gps(dict):
     def is_present(gpsifd):
         item = getattr(piexif.GPSIFD, gpsifd)
         if item in dict:
-            print(f"   {gpsifd} = {item}")
+            print(f"   {gpsifd} = id '{item}'")
             return dict[item]
         return None
         
@@ -139,6 +139,13 @@ def extract_gps(dict):
     def rational(tup):
         nom, denom = tup
         return nom/denom
+    
+    def rationalise(item):
+        df, mf, sf = item
+        d = rational(df)
+        m = rational(mf)
+        s = rational(sf)
+        return (d, m, s)
 
     compass_points = ["N", "NE", "E", "SE", "S", "SW", "W", "NW", "N"]
     if bearing := extract("GPSImgDirection"):
@@ -168,26 +175,54 @@ def extract_gps(dict):
         ds = ds.decode()
     else:
         ds = ""
-        
+    
     if  item := is_present("GPSTimeStamp"):
-        hf, mf, sf = item
-        h = rational(hf)
-        m = rational(mf)
-        s = rational(sf)
+        h, m, s = rationalise(item)
         timestamp_utc = f"{ds} {h:02.0f}:{m:02.0f}:{s:02.0f} +00:00 UTC"
     else:
         timestamp_utc = f"{ds}"
-       
- 
+    
+    print(f"attempting latitude")
+    if  ref := is_present("GPSLatitudeRef"): 
+        latref = ref.decode()
+    else:
+        latref = ""
+
+    if  item := is_present("GPSLatitude"): 
+        d, m, s = rationalise(item)
+        latitude = f"{d:02.0f}:{m:02.0f}:{s:02.0f} {latref}"
+        print(f"{latitude=}")
+        latitude = dms2dd(d, m, s, latref) 
+        print(f"{latitude=}")
+    else:
+        print("failed to find latitude")
+
+    print(f"attempting logitude")
+    if  ref := is_present("GPSLongitudeRef"): 
+        lonref = ref.decode()
+    else:
+        lonref = ""
+
+    if  item := is_present("GPSLongitude"): 
+        d, m, s = rationalise(item)
+        longitude = f"{d:02.0f}:{m:02.0f}:{s:02.0f} {lonref}"
+        print(f"{longitude=}")
+        longitude = dms2dd(d, m, s, lonref) 
+        print(f"{longitude=}")
+    else:
+        print("failed to find latitude")
+
+    location = f"{latitude:08.5f} {latref}, {longitude:09.5f} {lonref}"
     print(direction)
     print(altitude) 
     print(timestamp_utc)
     # location = dms2dd() # to do...
+    print(location)
 
-    return f"{direction}<br />{altitude}</br />{timestamp_utc}<br />"
+    return f"{direction}<br />{location}<br />{altitude}</br />{timestamp_utc}<br />"
 
 def fix_dump_bugs(exif_dict):
-    """piexif has a bug, this gets around it.
+    """piexif has several bugs, this gets around it.
     The Exif standard leaves some instance types "undefined". Great :-(
     
     see https://github.com/hMatoba/Piexif/issues/83
@@ -204,12 +239,12 @@ def fix_dump_bugs(exif_dict):
         if isinstance(cc, tuple):
             print(f"PIEXIF BUG workaround: 37121 {cc} is {type(cc)}") 
             exif_dict['Exif'][37121] = ",".join([str(v) for v in cc]).encode("ASCII")    
-    if 37380 in exif_dict['Exif']:
-        # exposure bias
-        cc = exif_dict['Exif'][37380]
-        if isinstance(cc, tuple):
-            print(f"PIEXIF BUG workaround: 37380 {cc} is {type(cc)}") 
-            exif_dict['Exif'][37380] = (0, 1)   
+    # if 37380 in exif_dict['Exif']:
+        # # exposure bias
+        # cc = exif_dict['Exif'][37380]
+        # if isinstance(cc, tuple):
+            # print(f"PIEXIF BUG workaround: 37380 exposure bias: {cc} is {type(cc)}") 
+            # exif_dict['Exif'][37380] = (0, 1)   
 
     if 50728 in exif_dict['Exif']:
         cc = exif_dict['Exif'][50728]