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| <head> |
| <meta charset="utf-8"/> |
| <title>GeohashRecord</title> |
| <link rel="stylesheet" href="../../../../../css/component-usage.css" type="text/css"/> |
| </head> |
| |
| <body> |
| <h1>Overview</h1> |
| <p> |
| A Geohash value corresponds to a specific area with pre-defined granularity and is widely used in identifying, |
| representing and indexing geospatial objects. |
| This GeohashRecord processor provides the ability to encode and decode Geohashes with desired format and precision. |
| </p> |
| <h3>Formats supported</h3> |
| <p> |
| <ul> |
| <li>BASE32: The most commonly used alphanumeric version. It is compact and more human-readable by discarding |
| some letters(such as "a" and "o", "i" and "l") that might cause confusion. |
| </li> |
| <li>BINARY: This format is generated by directly interleaving latitude and longitude binary strings. |
| The even bits in the binary strings correspond to the longitude, while the odd digits correspond to the latitude. |
| </li> |
| <li>LONG: Although this 64-bit number format is not human-readable, it can be calculated very fast and is |
| more efficient. |
| </li> |
| </ul> |
| </p> |
| <h3>Precision supported</h3> |
| |
| <p> |
| In <b>ENCODE</b> mode, users specify the desired precision level, which should be an integer number between 1 and |
| 12. A greater level will generate a longer Geohash with higher precision. |
| </p> |
| <p> |
| In DECODE mode, users are not asked to provide a precision level because this information is contained in the length |
| of Geohash values given. |
| </p> |
| </body> |
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