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fix bad urls

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Philip Sargent
2026-02-03 15:41:01 +00:00
parent 9517a4366c
commit 3de8f06b90
8 changed files with 30 additions and 6 deletions
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf8" />
<title>
Settings
</title>
<link rel="stylesheet" type="text/css" href="/css/main2.css" />
</head>
<body>
<H1>Settings</H1>
<div class="centre"><img alt="" src="/handbook/computing/i/Screenshot_20260203-142503.jpg" />
</div>
<p>settings<br /><a href='?to_be_rotated'><b>&olarr;</b>&nbsp;</a>rotate this image<br /><br /><br /></br /><br /></p>
<p class="caption">Photo &copy; Philip Sargent, 2026</p>
<hr />
</body>
</html>

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handbook/computing/myphone.html
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@@ -112,5 +112,5 @@ Go on to <a href="/handbook/survey/newcave.html">Next survey guide page</a> - 'B
<a href="/handbook/computing/myphone.html">Your phone on expo</a> - Do not select the "high accuracy" location setting on your phone (this page)<br /> <a href="/handbook/computing/myphone.html">Your phone on expo</a> - Do not select the "high accuracy" location setting on your phone (this page)<br />
<a href="/handbook/essentials.html">GPS essentials on the plateau</a> - Safety information<br /> <a href="/handbook/essentials.html">GPS essentials on the plateau</a> - Safety information<br />
<a href="/logbookentry/2024-07-21/2024-07-21c">Photo GPS</a> - Is unreliable unless you follow procedure<br /> <a href="/logbookentry/2024-07-21/2024-07-21c">Photo GPS</a> - Is unreliable unless you follow procedure<br />
<a href="/handbook/survey/gps.htm_edit">Locating Entrances</a> - expo recommended methods<br /> <a href="/handbook/survey/gps.htm">Locating Entrances</a> - expo recommended methods<br />
</div></body></html> </div></body></html>

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handbook/computing/phonecompass.html
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<p>First of all, ensure that you have one. <a href="https://www.androidauthority.com/best-compass-apps-android-2-954789/">Compass & Altimeter</a> is a good one, completely free (but turn off the altimeter setting as it does not do what you think it does). <p>First of all, ensure that you have one. <a href="https://www.androidauthority.com/best-compass-apps-android-2-954789/">Compass & Altimeter</a> is a good one, completely free (but turn off the altimeter setting as it does not do what you think it does).
<p>Turn OFF "precise location" - all that does it connect to wi-fi and cell-phone masts so that it can send you targeted ads and guess your altitude based on the altitude of the wi-fi point. Entirely unuseful - and frankly misleading - on the plateau. <p>Turn OFF "precise location" - all that does it connect to wi-fi and cell-phone masts so that it can send you targeted ads and guess your altitude based on the altitude of the wi-fi point. Entirely unuseful - and frankly misleading - on the plateau.
<p>Turn OFF altitude - useless and misleading on the plateau. <p>Turn OFF altitude - useless and misleading on the plateau.
<div class="onleft"><a href='/handbook/computing/i/Screenshot_20260203-140430.jpg'> <div class="onleft"><a href='/handbook/computing/i/Screenshot_20260203-142503.jpg'><img src='/handbook/computing/t/Screenshot_20260203-142503.jpg' /></a>&nbsp;
<img src='/handbook/computing/t/Screenshot_20260203-140430.jpg' alt="screenshot compass app settings" /></a>
<p class="caption">Settings</p></div> <p class="caption">Settings</p></div>
<p>Change the setting to MAGNETIC NORTH not True North. All our survey instruments use magnetic north, and this needs to be compatible with surveys. You may be using this compass app to determine the location of a cave entrance with respect to the nearest GPS point. You do NOT want "geographic" north. <p>Change the setting to MAGNETIC NORTH not True North. All our survey instruments use magnetic north, and this needs to be compatible with surveys. You may be using this compass app to determine the location of a cave entrance with respect to the nearest GPS point. You do NOT want "geographic" north.
<p>Do NOT select "gradians" for the angle units. All our Austrian surveys use 360 degree angles, not 400 gradians, for a full circle. <p>Do NOT select "gradians" for the angle units. All our Austrian surveys use 360 degree angles, not 400 gradians, for a full circle.

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handbook/essentials.html
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<a href="/handbook/computing/myphone.html">Your phone on expo</a> - Do not select the "high accuracy" location setting on your phone<br /> <a href="/handbook/computing/myphone.html">Your phone on expo</a> - Do not select the "high accuracy" location setting on your phone<br />
<a href="/handbook/essentials.html">GPS essentials on the plateau</a> - Safety information (this page)<br /> <a href="/handbook/essentials.html">GPS essentials on the plateau</a> - Safety information (this page)<br />
<a href="/logbookentry/2024-07-21/2024-07-21c">Photo GPS</a> - Is unreliable unless you follow procedure<br /> <a href="/logbookentry/2024-07-21/2024-07-21c">Photo GPS</a> - Is unreliable unless you follow procedure<br />
<a href="/handbook/survey/gps.htm_edit">Locating Entrances</a> - expo recommended methods<br /> <a href="/handbook/survey/gps.htm">Locating Entrances</a> - expo recommended methods<br />
</div></body> </div></body>
</html> </html>

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handbook/survey/gps.htm
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@@ -117,6 +117,6 @@ on coordinate systems</a> has been moved to a different page. If you are really
<a href="/handbook/computing/myphone.html">Your phone on expo</a> - Do not select the "high accuracy" location setting on your phone<br /> <a href="/handbook/computing/myphone.html">Your phone on expo</a> - Do not select the "high accuracy" location setting on your phone<br />
<a href="/handbook/essentials.html">GPS essentials on the plateau</a> - Safety information<br /> <a href="/handbook/essentials.html">GPS essentials on the plateau</a> - Safety information<br />
<a href="/logbookentry/2024-07-21/2024-07-21c">Photo GPS</a> - Is unreliable unless you follow procedure<br /> <a href="/logbookentry/2024-07-21/2024-07-21c">Photo GPS</a> - Is unreliable unless you follow procedure<br />
<a href="/handbook/survey/gps.htm_edit">Locating Entrances</a> - expo recommended methods (this page)<br /> <a href="/handbook/survey/gps.htm">Locating Entrances</a> - expo recommended methods (this page)<br />
</div></body> </div></body>
</html> </html>

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years/2024/log_entries/2024-07-21c.json
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"title": "Photo - Photo GPS is unreliable", "title": "Photo - Photo GPS is unreliable",
"place": "Photo", "place": "Photo",
"other_people": "", "other_people": "",
"text": "During this same trip walking to Geschandalm, later analysis of the GPS locations of various photos showed a lot of variability. \nThis is a particularly clear example where the location is obvious in the photo (it is definitely on the path) \nbut the GPS location stored by the phone camera is 60m away.\n<p>\nI had one phone (Xioami) continually tracking my location (using OSMand) which produced the GPX track, \nand another (Pixel) used for photographs. \nThe GPS data in the photos is clearly completely wrong for some of the photos - \npresumably because I hadn't left enough time for it to get a decent GPS fix before taking the photo. \nThis is particularly clear when there is a well-identified spot in the photo, \nsuch as this one right by the shady cliff (photo EXIF GPS locations are orange dots):<br>\n<a href=\"/years/2024/images/bad-gps.jpg\">\n<img width=20% src=\"/years/2024/images/bad-gps.jpg\"></a>&nbsp;\n<a href='/years/2024/l/PXL_20240721_082604148.NIGHT.html'><img src='/years/2024/t/PXL_20240721_082604148.NIGHT.jpg' /></a>&nbsp;\n<p>\nThe lesson to take away from this is to always take TWO photos at any one position, and throw away the first one. \nThis will nearly always work for most people, and is sufficiently simple that even undergraduates can remember it.\nAdditionally, \n<ol><li>always continually record a GPS track on the phone you are using to take photos with - \nthough this is unfortunately not always reliable either, as the camera app tends to cache locations and doesn't always \nget a fresh one from the \"location\" module in the phone,\n<li>Take a screenshot of the <a href=\"https://github.com/barbeau/gpstest#readme\">GPStest</a> app showing current location and accuracy data. You can get it from F-Droid or Google Play Store. <br /><figure class=onright width=20><a href='https://github.com/barbeau/gpstest#readme'><img width=64px src='/handbook/computing/t/gpstest.jpg' /></a><a href='https://github.com/barbeau/gpstest#readme'>&nbsp;<img width=64px src='/handbook/computing/t/F-Droid_Logo_4.svg.jpg' /></a>&nbsp;\n</figure>\n</ol>\n</p>\n <br />\n<div class=\"text-box\">\n<a href=\"/handbook/computing/myphone.html\">Your phone on expo</a> - Do not select the \"high accuracy\" location setting on your phone<br />\n<a href=\"/handbook/essentials.html\">GPS essentials on the plateau</a> - Safety information<br />\n<a href=\"/logbookentry/2024-07-21/2024-07-21c\">Photo GPS</a> - Is unreliable unless you follow procedure (this page)<br />\n <a href=\"/handbook/survey/gps.htm_edit\">Locating Entrances</a> - expo recommended methods<br />\n</div>", "text": "During this same trip walking to Geschandalm, later analysis of the GPS locations of various photos showed a lot of variability. \nThis is a particularly clear example where the location is obvious in the photo (it is definitely on the path) \nbut the GPS location stored by the phone camera is 60m away.\n<p>\nI had one phone (Xioami) continually tracking my location (using OSMand) which produced the GPX track, \nand another (Pixel) used for photographs. \nThe GPS data in the photos is clearly completely wrong for some of the photos - \npresumably because I hadn't left enough time for it to get a decent GPS fix before taking the photo. \nThis is particularly clear when there is a well-identified spot in the photo, \nsuch as this one right by the shady cliff (photo EXIF GPS locations are orange dots):<br>\n<a href=\"/years/2024/images/bad-gps.jpg\">\n<img width=20% src=\"/years/2024/images/bad-gps.jpg\"></a>&nbsp;\n<a href='/years/2024/l/PXL_20240721_082604148.NIGHT.html'><img src='/years/2024/t/PXL_20240721_082604148.NIGHT.jpg' /></a>&nbsp;\n<p>\nThe lesson to take away from this is to always take TWO photos at any one position, and throw away the first one. \nThis will nearly always work for most people, and is sufficiently simple that even undergraduates can remember it.\nAdditionally, \n<ol><li>always continually record a GPS track on the phone you are using to take photos with - \nthough this is unfortunately not always reliable either, as the camera app tends to cache locations and doesn't always \nget a fresh one from the \"location\" module in the phone,\n<li>Take a screenshot of the <a href=\"https://github.com/barbeau/gpstest#readme\">GPStest</a> app showing current location and accuracy data. You can get it from F-Droid or Google Play Store. <br /><figure class=onright width=20><a href='https://github.com/barbeau/gpstest#readme'><img width=64px src='/handbook/computing/t/gpstest.jpg' /></a><a href='https://github.com/barbeau/gpstest#readme'>&nbsp;<img width=64px src='/handbook/computing/t/F-Droid_Logo_4.svg.jpg' /></a>&nbsp;\n</figure>\n</ol>\n</p>\n <br />\n<div class=\"text-box\">\n<a href=\"/handbook/computing/myphone.html\">Your phone on expo</a> - Do not select the \"high accuracy\" location setting on your phone<br />\n<a href=\"/handbook/essentials.html\">GPS essentials on the plateau</a> - Safety information<br />\n<a href=\"/logbookentry/2024-07-21/2024-07-21c\">Photo GPS</a> - Is unreliable unless you follow procedure (this page)<br />\n <a href=\"/handbook/survey/gps.htm\">Locating Entrances</a> - expo recommended methods<br />\n</div>",
"slug": "2024-07-21c", "slug": "2024-07-21c",
"time_underground": 0.0, "time_underground": 0.0,
"author": { "author": {