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smart resolution guessing

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abelvm
2016-08-18 16:13:56 -04:00
parent b7a412fa4d
commit 0f47659cf9
3 changed files with 36 additions and 17 deletions
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doc/19_contour.md
+7 -4
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@@ -14,11 +14,11 @@ Function to generate a contour map from an scatter dataset of points, using one
|------|------|-------------|
| geom | geometry[] | Array of points's geometries |
| values | numeric[] | Array of points' values for the param under study|
| resolution | integer | Size in meters of the cells in the grid|
| buffer | numeric | Value between 0 and 1 for spatial buffer of the set of points
| method | integer | 0:nearest neighbor, 1: barycentric, 2: IDW|
| classmethod | integer | 0:equals, 1: heads&tails, 2:jenks, 3:quantiles |
| steps | integer | Number of steps in the classification|
| max_time | integer | Max time in millisecons for processing time
### Returns
Returns a table object
@@ -37,11 +37,14 @@ Returns a table object
WITH a AS (
SELECT
ARRAY[800, 700, 600, 500, 400, 300, 200, 100]::numeric[] AS vals,
ARRAY[ST_GeomFromText('POINT(2.1744 41.403)'),ST_GeomFromText('POINT(2.1228 41.380)'),ST_GeomFromText('POINT(2.1511 41.374)'),ST_GeomFromText('POINT(2.1528 41.413)'),ST_GeomFromText('POINT(2.165 41.391)'),ST_GeomFromText('POINT(2.1498 41.371)'),ST_GeomFromText('POINT(2.1533 41.368)'),ST_GeomFromText('POINT(2.131386 41.41399)')] AS g
)
ARRAY[ST_GeomFromText('POINT(2.1744 41.403)',4326),ST_GeomFromText('POINT(2.1228 41.380)',4326),ST_GeomFromText('POINT(2.1511 41.374)',4326),ST_GeomFromText('POINT(2.1528 41.413)',4326),ST_GeomFromText('POINT(2.165 41.391)',4326),ST_GeomFromText('POINT(2.1498 41.371)',4326),ST_GeomFromText('POINT(2.1533 41.368)',4326),ST_GeomFromText('POINT(2.131386 41.41399)',4326)] AS g
),
b as(
SELECT
foo.*
FROM
a,
CDB_contour(a.g, a.vals, 500, 0.0, 1,3,5) foo;
cdb_crankshaft.CDB_contour(a.g, a.vals, 0.0, 1, 3, 5, 60) foo
)
SELECT bin, avg_value from b order by bin;
```