生成postgis 网格的方法

最新推荐文章于 2024-09-24 22:40:22 发布

最新推荐文章于 2024-09-24 22:40:22 发布 · 1k 阅读

本文介绍使用SQL语句生成蜂窝图案与正方形网格的方法。通过特定的SQL语句，可以创建出蜂窝状的多边形以及矩形网格，并通过translate函数调整位置。这些图形可用于地理信息系统或地图可视化中。

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蜂窝结果的Grid图：

SELECT translate(the_geom, x_series, y_series)
from generate_series(0 - 128, 10000 + 128, 128) as x_series,
generate_series(0 - 128, 10000 + 128, 256) as y_series,
(
SELECT 'POLYGON((0 0,64 64,64 128,0 192,-64 128,-64 64,0 0))'::geometry as the_geom
UNION
SELECT translate('POLYGON((0 0,64 64,64 128,0 192,-64 128,-64 64,0 0))'::geometry, 64, 128) as the_geom
) as one_hex

正方形的图：

create table squ_grid (gid serial not null primary key, the_geom geometry not null);

INSERT INTO squ_grid (the_geom)
SELECT translate(the_geom, x_series, y_series)
from generate_series(0 - 128, 10000 + 128, 128) as x_series,
generate_series(0 - 128, 10000 + 128, 256) as y_series,
(
SELECT geomFromText('POLYGON((0 0,0 64,64 64,64 0,0 0))',900913)::geometry as the_geom

) as one_hex;

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