<html><body style="font-family: Roboto,Helvetica,Arial,sans-serif; margin: 0; padding: 0; height: 100%; width: 100%;"><table border="0" cellpadding="0" cellspacing="0" style="background-color:rgb(103,58,183);" width="100%" role="presentation"><tbody><tr height="64px"><td style="padding-left: 24px"><img alt="Google Forms" height="26px" style="display: inline-block; margin: 0; vertical-align: middle;" width="143px" src="https://www.gstatic.com/docs/forms/google_forms_logo_lockup_white_2x.png"></td></tr></tbody></table><div style="padding: 24px; background-color:rgb(237,231,246)"><table align="center" border="0" cellpadding="0" cellspacing="0" style="max-width: 672px; min-width: 154px;" width="100%" role="presentation"><tbody><tr><td style="font-size: 13px; line-height: 18px; color: #424242; font-weight: 700">Having trouble viewing or submitting this form?</td></tr><tr height="8px"><td></td></tr><tr><td><table border="0" cellpadding="0" cellspacing="0" width="100%"><tbody><tr><td><a href="https://docs.google.com/forms/d/e/1FAIpQLSeqok1ffk9TuU7SJvppzJmZA12dhT02-I3GAZh4I-up2LF_-g/viewform?vc=0&c=0&w=1&usp=mail_form_link" style="border-radius: 3px; box-sizing: border-box; display: inline-block; font-size: 13px; font-weight: 700; height: 40px; line-height: 40px; padding: 0 24px; text-align: center; text-decoration: none; text-transform: uppercase; vertical-align: middle; color: #fff; background-color: rgb(103,58,183);" target="_blank" rel="noopener">Fill out in Google Forms</a></td></tr></tbody></table></td></tr><tr height="24px"><td></td></tr></tbody></table><div align="center" style="background-color: #fff; border-bottom: 1px solid #e0e0e0; margin: 0 auto; max-width: 624px; min-width: 154px; padding: 0 24px;"><table align="center" cellpadding="0" cellspacing="0" style="background-color: #fff;" width="100%" role="presentation"><tbody><tr height="24px"><td></td></tr><tr><td><span style="display: table-cell; vertical-align: top; font-size: 13px; line-height: 18px; color: #424242;" dir="auto">Sometime back, we sent around a form with a request to do some tests on your GPS or Smartphone for us. <br><br>I have had a very poor response so far, and was hoping that you could take 10 minutes to carry out some tests for us. If you are unable to find a spot height or trig point, then use an identifieable point and report against Google Earth as requested.<br><br>We are asking for this, because many of the published results are from the USA or Europe, and we would like to get a good data set from a range of locations. Some testing I did recently on an outer island of Fiji gave much worse results for elevation than we expected, although horizontal accuracy was reasonable. <br><br>Details are below</span></td></tr><tr height="20px"><td></tr><tr style="font-size: 20px; line-height: 24px;"><td dir="auto"><a href="https://docs.google.com/forms/d/e/1FAIpQLSeqok1ffk9TuU7SJvppzJmZA12dhT02-I3GAZh4I-up2LF_-g/viewform?vc=0&c=0&w=1&usp=mail_form_link" style="color: rgb(103,58,183); text-decoration: none; vertical-align: middle; font-weight: 500">Accuracy of Elevation (and georeference) from Smartphones and GPS</a><div itemprop="action" itemscope itemtype="http://schema.org/ViewAction"><meta itemprop="url" content="https://docs.google.com/forms/d/e/1FAIpQLSeqok1ffk9TuU7SJvppzJmZA12dhT02-I3GAZh4I-up2LF_-g/viewform?vc=0&c=0&w=1&usp=mail_goto_form"><meta itemprop="name" content="Fill out form"></div></td></tr><tr height="16px"></tr><tr><td style="display: table-cell; vertical-align: top; font-size: 13px; line-height: 18px; color: #424242;" dir="auto">Arthur D. Chapman<br><br>John Wieczorek and I are currently writing a new edition of the Georeferencing Best Practices document and are expanding the section on determining elevation (including from smartphones). We have done some preliminary tests and found some variation between areas. We would like to get some definitive data from different parts of the world. If we get enough results, we will publish them separately and included a summary in the BP document.<br><br>1. Find a location where the elevation is known (i.e. Trig point, Benchmark, Contour off DTM or (recent) topographic map)<br>2. Make sure the area is at a point that can be easily seen and located on Google Earth.<br>3. Make sure area is free from obstructions (to low on horizon as you are looking for satellites on outer range of GPS) i.e. free from trees or buildings<br>4. Open the GPS or the GPS App (not navigation app) – on Android there are at least two that I have used – GPS Status and GPS Test. There are a number of IOS Apps for Apple<br>5. Make sure your GPS is enabled.<br>6. Set your GPS or phone app to a relevant reference vertical datum (Mean Sea Level or geoid). NB not ellipsoid or WGS84. In the GPS Status app you can set the elevation (altitude) in the settings to MSL; in the GPS Test app to geoid. I am not sure of Apple apps.<br>7. Set your smartphone or GPS on the ground<br>8. Once you have plenty of satellites locked in (including several at the edges) allow the receiver to settle (around 3 minutes – but at least 1 min)<br>9. Record the locality (latitude and longitude in decimal degrees using all digits), Datum, Accuracy shown by GPS<br>10. Record the elevation (altitude), Vertical datum (MSL, geoid), number of Satellites and the spot height from the DTM, topographic map, etc.<br>11. Record the elevation shown by Google Earth, and Measure the horizontal distance from your recorded point to the point shown on Google Earth.<br>12. Please do at least 3 replicates on different days and different times if possible<br></td></tr><tr height="24px"></tr><tr><td><div class="ss-form" style=""><form action="https://docs.google.com/forms/u/0/d/e/1FAIpQLSeqok1ffk9TuU7SJvppzJmZA12dhT02-I3GAZh4I-up2LF_-g/formResponse" method="POST" id="ss-form" target="_self" style=""><ol role="list" class="ss-question-list" style="padding-left: 0;list-style-type:none;">
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<div dir="auto" class="ss-item ss-item-required ss-text" style="margin:12px 0;"><div class="ss-form-entry" style="margin-bottom:1.5em;vertical-align:middle;margin-left:0;margin-top:0;max-width:100%;">
<label class="ss-q-item-label" for="entry_739966687" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Name of App
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<span class="ss-required-asterisk" aria-hidden="true" style="color:#c43b1d;">*</span></div>
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<label class="ss-q-item-label" for="entry_732858020" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Country
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<span class="ss-required-asterisk" aria-hidden="true" style="color:#c43b1d;">*</span></div>
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<label class="ss-q-item-label" for="entry_390059856" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Latitude, Longitude (decimal degrees, include all digits)
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<label class="ss-q-item-label" for="entry_1512774920" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Geodetic Datum or CRS from GPS (e.g. WGS84, SIRGAS2000, EPSG:4326)
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<span class="ss-required-asterisk" aria-hidden="true" style="color:#c43b1d;">*</span></div>
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<div dir="auto" class="ss-item ss-item-required ss-text" style="margin:12px 0;"><div class="ss-form-entry" style="margin-bottom:1.5em;vertical-align:middle;margin-left:0;margin-top:0;max-width:100%;">
<label class="ss-q-item-label" for="entry_781096364" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Accuracy shown by GPS (m)
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<div dir="auto" class="ss-item ss-item-required ss-text" style="margin:12px 0;"><div class="ss-form-entry" style="margin-bottom:1.5em;vertical-align:middle;margin-left:0;margin-top:0;max-width:100%;">
<label class="ss-q-item-label" for="entry_132497629" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Elevation Recorded (m)
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<div dir="auto" class="ss-item ss-item-required ss-text" style="margin:12px 0;"><div class="ss-form-entry" style="margin-bottom:1.5em;vertical-align:middle;margin-left:0;margin-top:0;max-width:100%;">
<label class="ss-q-item-label" for="entry_680412487" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Elevation reference datum from GPS (Mean Sea Level, geoid)
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<span class="ss-required-asterisk" aria-hidden="true" style="color:#c43b1d;">*</span></div>
<div class="ss-q-help ss-secondary-text" dir="auto" style="display:block;margin:.1em 0 .25em 0;color:#666;"></div></label>
<input type="text" name="entry.680412487" value="" class="ss-q-short" id="entry_680412487" dir="auto" aria-label="Elevation reference datum from GPS (Mean Sea Level, geoid) " aria-required="true" title="" style="">
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<div dir="auto" class="ss-item ss-item-required ss-text" style="margin:12px 0;"><div class="ss-form-entry" style="margin-bottom:1.5em;vertical-align:middle;margin-left:0;margin-top:0;max-width:100%;">
<label class="ss-q-item-label" for="entry_725829505" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Number of Satellites
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<span class="ss-required-asterisk" aria-hidden="true" style="color:#c43b1d;">*</span></div>
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<div dir="auto" class="ss-item ss-item-required ss-radio" style="margin:12px 0;"><div class="ss-form-entry" style="margin-bottom:1.5em;vertical-align:middle;margin-left:0;margin-top:0;max-width:100%;">
<label class="ss-q-item-label" for="entry_724103325" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Source of Elevation
<label for="itemView.getDomIdToLabel()" aria-label="(Required field)" style=""></label>
<span class="ss-required-asterisk" aria-hidden="true" style="color:#c43b1d;">*</span></div>
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<ul class="ss-choices" role="radiogroup" aria-label="Source of Elevation " style="list-style:none;padding:0;margin:.5em 0 0;"><li class="ss-choice-item" style="margin:0;line-height:1.3em;padding-bottom:.5em;">
<label><span class="ss-choice-item-control goog-inline-block" style="position:relative;display:inline-block;"><input type="radio" name="entry.2061888451" value="Contour" id="group_2061888451_1" role="radio" class="ss-q-radio" aria-label="Contour" aria-required="true" style=""></span>
<span class="ss-choice-label" style="">Contour</span>
</label></li> <li class="ss-choice-item" style="margin:0;line-height:1.3em;padding-bottom:.5em;">
<label><span class="ss-choice-item-control goog-inline-block" style="position:relative;display:inline-block;"><input type="radio" name="entry.2061888451" value="Fixed Geodetic Survey Station (Trig Point, Trig Beacon, Triangulation pillar, Benchmark, Monument)" id="group_2061888451_2" role="radio" class="ss-q-radio" aria-label="Fixed Geodetic Survey Station (Trig Point, Trig Beacon, Triangulation pillar, Benchmark, Monument)" aria-required="true" style=""></span>
<span class="ss-choice-label" style="">Fixed Geodetic Survey Station (Trig Point, Trig Beacon, Triangulation pillar, Benchmark, Monument)</span>
</label></li> <li class="ss-choice-item" style="margin:0;line-height:1.3em;padding-bottom:.5em;">
<label><span class="ss-choice-item-control goog-inline-block" style="position:relative;display:inline-block;"><input type="radio" name="entry.2061888451" value="Spot Height (point on a topographic map (usually a triangle) with the elevation recorded beside it)" id="group_2061888451_3" role="radio" class="ss-q-radio" aria-label="Spot Height (point on a topographic map (usually a triangle) with the elevation recorded beside it)" aria-required="true" style=""></span>
<span class="ss-choice-label" style="">Spot Height (point on a topographic map (usually a triangle) with the elevation recorded beside it)</span>
</label></li> <li class="ss-choice-item" style="margin:0;line-height:1.3em;padding-bottom:.5em;"><label><span class="ss-choice-item-control goog-inline-block" style="position:relative;display:inline-block;"><input type="radio" name="entry.2061888451" value="__other_option__" id="group_2061888451_4" role="radio" class="ss-q-radio ss-q-other-toggle" aria-required="true" style=""></span>
<span class="ss-choice-label" style="">Other:</span></label>
<span class="ss-q-other-container goog-inline-block" style="position:relative;display:inline-block;"><input type="text" name="entry.2061888451.other_option_response" value="" class="ss-q-other" id="entry_2061888451_other_option_response" dir="auto" aria-label="Other" style=""></span>
</li></ul>
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<div dir="auto" class="ss-item ss-item-required ss-text" style="margin:12px 0;"><div class="ss-form-entry" style="margin-bottom:1.5em;vertical-align:middle;margin-left:0;margin-top:0;max-width:100%;">
<label class="ss-q-item-label" for="entry_952971114" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Elevation from Contour/Trig/Spot Height, etc. (m)
<label for="itemView.getDomIdToLabel()" aria-label="(Required field)" style=""></label>
<span class="ss-required-asterisk" aria-hidden="true" style="color:#c43b1d;">*</span></div>
<div class="ss-q-help ss-secondary-text" dir="auto" style="display:block;margin:.1em 0 .25em 0;color:#666;"></div></label>
<input type="number" name="entry.952971114" value="" class="ss-q-short" id="entry_952971114" dir="auto" aria-label="Elevation from Contour/Trig/Spot Height, etc. (m) Must be a number" aria-required="true" title="Must be a number" style="">
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<div dir="auto" class="ss-item ss-item-required ss-text" style="margin:12px 0;"><div class="ss-form-entry" style="margin-bottom:1.5em;vertical-align:middle;margin-left:0;margin-top:0;max-width:100%;">
<label class="ss-q-item-label" for="entry_348034027" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Elevation from Google Earth (m)
<label for="itemView.getDomIdToLabel()" aria-label="(Required field)" style=""></label>
<span class="ss-required-asterisk" aria-hidden="true" style="color:#c43b1d;">*</span></div>
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<input type="text" name="entry.348034027" value="" class="ss-q-short" id="entry_348034027" dir="auto" aria-label="Elevation from Google Earth (m) " aria-required="true" title="" style="">
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<div dir="auto" class="ss-item ss-text" style="margin:12px 0;"><div class="ss-form-entry" style="margin-bottom:1.5em;vertical-align:middle;margin-left:0;margin-top:0;max-width:100%;">
<label class="ss-q-item-label" for="entry_1608354832" style=""><div class="ss-q-title" style="display:block;font-weight:bold;margin-top:.83em;margin-bottom:.83em;">Horizontal Difference between GPS and Google Earth (m)
</div>
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<input type="text" name="entry.1608354832" value="" class="ss-q-short" id="entry_1608354832" dir="auto" aria-label="Horizontal Difference between GPS and Google Earth (m) " title="" style="">
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