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From desruisse...@apache.org
Subject svn commit: r1815601 - /sis/branches/JDK8/core/sis-referencing-by-identifiers/src/main/java/org/apache/sis/referencing/gazetteer/GeohashReferenceSystem.java
Date Fri, 17 Nov 2017 17:28:33 GMT
Author: desruisseaux
Date: Fri Nov 17 17:28:33 2017
New Revision: 1815601

URL: http://svn.apache.org/viewvc?rev=1815601&view=rev
Log:
Add a note about geohash versus MGRS.

Modified:
    sis/branches/JDK8/core/sis-referencing-by-identifiers/src/main/java/org/apache/sis/referencing/gazetteer/GeohashReferenceSystem.java

Modified: sis/branches/JDK8/core/sis-referencing-by-identifiers/src/main/java/org/apache/sis/referencing/gazetteer/GeohashReferenceSystem.java
URL: http://svn.apache.org/viewvc/sis/branches/JDK8/core/sis-referencing-by-identifiers/src/main/java/org/apache/sis/referencing/gazetteer/GeohashReferenceSystem.java?rev=1815601&r1=1815600&r2=1815601&view=diff
==============================================================================
--- sis/branches/JDK8/core/sis-referencing-by-identifiers/src/main/java/org/apache/sis/referencing/gazetteer/GeohashReferenceSystem.java
[UTF-8] (original)
+++ sis/branches/JDK8/core/sis-referencing-by-identifiers/src/main/java/org/apache/sis/referencing/gazetteer/GeohashReferenceSystem.java
[UTF-8] Fri Nov 17 17:28:33 2017
@@ -43,6 +43,11 @@ import org.opengis.referencing.gazetteer
 
 /**
  * Geographic coordinates represented as <cite>geohashes</cite> strings.
+ * Geohash is a simple encoding of geographic coordinates into a short string of letters
and digits.
+ * Longer strings are more accurate, however the accuracy is not uniformly distributed between
latitude
+ * and longitude, and removing digits decreases accuracy faster when the point is located
close to the
+ * equator than close to a pole. For a system having more uniform accuracy, see the
+ * {@linkplain MilitaryGridReferenceSystem Military Grid Reference System} (MGRS).
  *
  * @author  Chris Mattmann (JPL)
  * @author  Martin Desruisseaux (Geomatys)



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