From 5723f57fc51804e2b31d8b86705a97506bf6cee2 Mon Sep 17 00:00:00 2001
From: Philip Sargent <philip.sargent@gmail.com>
Date: Sat, 6 Nov 2021 00:15:24 +0200
Subject: [PATCH] Add crossrefs to handbook UTM pages, laser points
---
templates/eastings.html | 23 ++++++++++++++++++++---
1 file changed, 20 insertions(+), 3 deletions(-)
diff --git a/templates/eastings.html b/templates/eastings.html
index 422c9ea..1657ea1 100644
--- a/templates/eastings.html
+++ b/templates/eastings.html
@@ -1,13 +1,23 @@
{% extends "base.html" %}
-{% block title %}Cave Entrance locations in UTM{% endblock %}
+{% block title %}Cave Entrances and other locations in UTM{% endblock %}
{% block content %}
<h1>Entrance locations</h1>
<p>
-These are all the locations specified in Northing/Easting coordinates in the system.
+These are all the locations specified in Northing/Easting coordinates in the system.
+This report is to help you sort out and fix the bad data in our records. You can see from the tables here
+that UTM data sometimes have Northings and Eastings swapped, or UTM is used when it is intended to be
+BMN and vice versa.
+<p>
+Coordinate systems in Austria are explained in:<br>
+<a href="/handbook/survey/lasers.htm">Geographical fixed points on Loser</a><br>
+<a href="/handbook/survey/coord2.html">GPS and coordinate systems</a><br>
+<a href="/handbook/survey/coord.htm">Basic Coordinate Systems</a>.
+
+<p>The data in the table immediately below has been hand-entered and is sometimes very wrong.
<table>
<tr><th>Cave</th><th>Entrance</th><th>Easting</th><th>Northing</th><th>tag</th><th>tag exact</th><th>tag other</th><th>slug</th></tr>
{% for ent in ents %}
@@ -25,7 +35,14 @@ These are all the locations specified in Northing/Easting coordinates in the sys
{% endfor %}
</table>
-<p>But the Entrances - the objects in the troggle system - are not properly connected to the dataset which is the combined set of survex data. They are only linked - and only implicitly - by the tag name.
+<p>But the Entrances - the objects in the troggle system - are not properly connected to the dataset which is the combined set of survex data. They are only linked - and only implicitly - by the tag name. The data in the table below is calculated directly from
+the assemblage of survex files, including fixed point files, and is probably 'correct'.
+<p>But which coordinate system are they in ? Read these three articles to find out:
+<br>
+<a href="/eastings">Troggle UTM data report</a><br>
+<a href="/handbook/survey/lasers.htm">Geographical fixed points on Loser</a><br>
+<a href="/handbook/survey/coord2.html">GPS and coordinate systems</a><br>
+<a href="/handbook/survey/coord.htm">Basic Coordinate Systems</a>.
<table cellpadding="6" cellspacing="8">
<tr><th>Survex Station</th><th>x</th><th>y</th></tr>
{% for s in stations %}