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Incubator escapee wiki:WikiProject Geographical coordinates
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====Precision tables==== {{shortcut|WP:COORDPREC}} The following tables show suggested coordinates precisions for various object sizes and latitudes. Refer to the preceding section for more information about coordinates precision. To use these tables: * Choose one of the tables depending on whether you want '''degrees-minutes-seconds''' format or '''decimal degrees''' format * Find the column that is closest to the latitude of your object * Find the row that is closest to the size of your object * Note the coordinates precision at the intersection of your row and column {{Collapse top|title=Usage example|bg=#daf0da}} Example: You want coordinates, in decimal degrees format, for Yosemite National Park, California, U.S. * The size of the object is roughly 70 km * [https://geonames.usgs.gov/apex/f?p=138:1:0::::: GNIS query] gives the Park's location, in decimal degrees, as: 37.8483188 (north latitude), â119.5571434 (west longitude) To solve: * Choose the '''Decimal degrees format''' table * Find the '''45°''' column; 37.8483188 is (slightly) closer to 45° than to 30° * Find the '''50 km''' row; 70 km is closer to 50 km than to 100 km * Note the precision at the intersection of row and column: d.d° * [[Rounding|Round]] to the selected precision: 37.8, â119.6 (This is a good example of a ''borderline case'', as the latitude is quite close to 37.5°, the midpoint between 30° and 45°. If the Park were a mere 25 miles to the south, you would use the '''30°''' column instead, yielding a different precision: d.dd°. You could opt for that precision instead, giving 37.85, â119.56. That's your call. But the table shows that ''more than'' two decimal positions would definitely be too precise for this case.) {{Collapse bottom}} <!-- BACKGROUND COLORS: #f2f2f2 - gray for the object size header columns (latitude header rows have this color by default) #ffe7e7 - pink for data cells #daf0da - blue-green for data cells --> {| |- style="vertical-align:middle;" | {| class="wikitable" style="text-align:left;" |+ Degrees-minutes-seconds format ! !0° !30° !45° !60° |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''10 m''' |colspan="3" style="background:#f2f2f2; text-align:center;"|d° m' s.s" or d.ddddd° <sup>[note 3]</sup> |style="background:#ffe7e7;"|d° m' s.s" |- style="background:#ffe7e7;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''50 m''' ||d° m' s.s" ||d° m' s.s" ||d° m' s.s" ||d° m' s.s" |- style="background:#ffe7e7;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''100 m''' ||d° m' s.s" ||d° m' s.s" ||d° m' s.s" ||style="background:#daf0da;"|d° m' s" |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''500 m''' ||d° m' s" ||d° m' s" ||d° m' s" ||d° m' s" |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''1000 m<br>1 km''' ||d° m' s" ||d° m' s" ||d° m' s" ||d° m' s" |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''5 km''' ||d° m' s" ||d° m' s" ||d° m' s" ||style="background:#ffe7e7;"|d° m' |- style="background:#ffe7e7;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''10 km''' ||d° m' ||d° m' ||d° m' ||d° m' |- style="background:#ffe7e7;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''50 km''' ||d° m' ||d° m' ||d° m' ||d° m' |- style="background:#ffe7e7;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''100 km''' ||d° m' ||d° m' ||d° m' ||d° m' |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''500 km''' ||style="background:#ffe7e7;"|d° m' ||d° ||d° ||d° |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''1000 km''' ||d° ||d° ||d° ||d° |} || {| class="wikitable" style="text-align:left; margin-left:20px;" |+ Decimal degrees format ! !0° !30° !45° !60° |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''10 m''' ||d.ddddd° ||d.ddddd° ||d.ddddd° ||d.ddddd° |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''50 m''' ||d.ddddd° ||d.ddddd° ||style="background:#ffe7e7;"|d.dddd° ||style="background:#ffe7e7;"|d.dddd° |- style="background:#ffe7e7;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''100 m''' ||d.dddd° ||d.dddd° ||d.dddd° ||d.dddd° |- style="background:#ffe7e7;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''500 m''' ||d.dddd° ||d.dddd° ||style="background:#daf0da;"|d.ddd° ||style="background:#daf0da;"|d.ddd° |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''1000 m<br>1 km''' ||d.ddd° ||d.ddd° ||d.ddd° ||d.ddd° |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''5 km''' ||d.ddd° ||d.ddd° ||style="background:#ffe7e7;"|d.dd° ||style="background:#ffe7e7;"|d.dd° |- style="background:#ffe7e7;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''10 km''' ||d.dd° ||d.dd° ||d.dd° ||d.dd° |- style="background:#ffe7e7;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''50 km''' ||d.dd° ||d.dd° ||style="background:#daf0da;"|d.d° ||style="background:#daf0da;"|d.d° |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''100 km''' ||d.d° ||d.d° ||d.d° ||d.d° |- style="background:#daf0da;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''500 km''' ||d.d° ||d.d° ||style="background:#ffe7e7;"|d° ||style="background:#ffe7e7;"|d° |- style="background:#ffe7e7;" |style="background:#f2f2f2; text-align:right; padding-right:10px;"|'''1000 km''' ||d° ||d° ||d° ||d° |} |} #{{smaller|The tables are derived from the precision data at {{section link||Precision guidelines}}, above. As suggested there, they use a target resolution of one-tenth of the object size.}} #{{smaller|The tables are not perfect. Some cases will yield a precision that is different from what you would get by doing the math (including trigonometry) for that specific case. This is because it is impossible to represent all cases correctly in a usable tabular format. The tables provide the correct precision for a majority of cases. Any error should be limited to one level of precision (e.g., '''d° m'''' vs. '''d° m' s"''', or '''d.ddd°''' vs. '''d.dddd°'''), which is acceptable for the purposes of Wikipedia coordinates.}} #{{smaller|'''d.ddddd°''' is roughly three times more precise than '''d° m' s.s"'''.}}
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