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add NN(s) support

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abelvm
2016-09-20 12:57:41 +02:00
parent 756db707b5
commit 2ff20e596e
2 changed files with 17 additions and 6 deletions
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doc/08_interpolation.md
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@@ -2,7 +2,7 @@
Function to interpolate a numeric attribute of a point in a scatter dataset of points, using one of three methos:
* [Nearest neighbor](https://en.wikipedia.org/wiki/Nearest-neighbor_interpolation)
* [Nearest neighbor(s)](https://en.wikipedia.org/wiki/Nearest-neighbor_interpolation)
* [Barycentric](https://en.wikipedia.org/wiki/Barycentric_coordinate_system)
* [IDW](https://en.wikipedia.org/wiki/Inverse_distance_weighting)
@@ -15,7 +15,7 @@ Function to interpolate a numeric attribute of a point in a scatter dataset of p
| query | text | query that returns at least `the_geom` and a numeric value as `attrib` |
| point | geometry | The target point to calc the value |
| method | integer | 0:nearest neighbor, 1: barycentric, 2: IDW|
| p1 | integer | IDW: limit the number of neighbors, 0->no limit|
| p1 | integer | limit the number of neighbors, IDW: 0->no limit, NN: 0-> closest one|
| p2 | integer | IDW: order of distance decay, 0-> order 1|
### CDB_SpatialInterpolation (geom geometry[], values numeric[], point geometry, method integer DEFAULT 1, p1 integer DEFAULT 0, ps integer DEFAULT 0)
@@ -28,7 +28,7 @@ Function to interpolate a numeric attribute of a point in a scatter dataset of p
| values | numeric[] | Array of points' values for the param under study|
| point | geometry | The target point to calc the value |
| method | integer | 0:nearest neighbor, 1: barycentric, 2: IDW|
| p1 | integer | IDW: limit the number of neighbors, 0->no limit|
| p1 | integer | limit the number of neighbors, IDW: 0->no limit, NN: 0-> closest one|
| p2 | integer | IDW: order of distance decay, 0-> order 1|
### Returns