geo.geohash
bbox-geom
(bbox-geom geohash)
character-precision
(character-precision geohash)
concentric-square-rings
(concentric-square-rings origin)
(concentric-square-rings origin n)
Given a single geohash, returns a lazy sequence of concentric square rings
of geohashes around it. The first element is [hash], the second element is
[northern-neighbor, northwest-neighbor, west-neighbor, ...], the third
element is the list of all geohashes around *those*, and so on.
degrees-precision-lat-cache
degrees-precision-long-cache
eastern-neighbor
(eastern-neighbor h)
geohash
(geohash string)
(geohash point precision)
(geohash lat long precision)
Creates a geohash from a string, or at the given point with the given bit
precision.
geohash-center
(geohash-center geohash)
Returns the center point of a geohash.
geohash-error
(geohash-error geohash)
Returns the error (i.e. the distance in meters between opposite corners) of
the given geohash.
geohash-max-error
(geohash-max-error bits)
Returns the maximum error (i.e. the distance between opposite corners of the
geohash bounding box) for a given number of geohash bits. Geohashes are least
precise at the equator.
geohash-midline-area
(geohash-midline-area geohash)
An estimate of a geohash's area, in square meters, based on its midline
dimensions.
geohash-midline-dimensions
(geohash-midline-dimensions geohash)
Returns a vector of [lat-extent long-extent], where lat-extent is the length
of the geohash through the midpoint of top and bottom, and long-extent is the
length of the geohash through the midpoint of left and right sides. All
figures in meters.
geohashes-intersecting
(geohashes-intersecting shape desired-level)
(geohashes-intersecting shape min-level max-level)
geohashes-near
(geohashes-near point radius precision)
Returns a list of geohashes of the given precision within radius meters of
the given point.
least-upper-bound-index
(least-upper-bound-index numbers target)
Given a sequence of numbers in descending order, finds the index of the
largest number which is just greater than the target.
northern-neighbor
(northern-neighbor h)
shape->precision
(shape->precision shape)
Estimates the precision which generates geohash regions on the scale of the
given shape.
significant-bits
(significant-bits geohash)
southern-neighbor
(southern-neighbor h)
square-ring
(square-ring origin n)
Given a geohash at the northeast corner of a square (n-2) geohashes on a
side, returns a list of geohashes in a path around the square, such that the
first entry in the list is the northeast corner of a square (n) geohashes on
a side.
O is the origin argument
F is the first hash in the returned sequence
L is the last hash in the returned sequence
E represents the last *and* first in the sequence
n=1 3 5 7
+----LF
+--LF | O|
+LF | O| | |
E |O| | | | |
+-+ | | | |
+---+ | |
+-----+
If n is one, returns [origin].
This algorithm is undefined at the poles.
string
(string geohash)
Returns the base32 encoded string value of a geohash.
subdivide
(subdivide geohash)
(subdivide geohash precision)
Given a geohash, returns all geohashes inside it, of a given precision.
subdivide-levels
(subdivide-levels geohash min-precision max-precision)
Given a geohash and a range of levels, return all geohashes inside the
given geohash at all the levels in the range
western-neighbor
(western-neighbor h)