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Results tagged with polygon
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user 960
On a map, a closed shape defined by a connected sequence of x,y coordinate pairs, where the first and last coordinate pair are the same and all other pairs are unique.
3
votes
maximum circle inside an irregular polygon from a random point
I just wanted to test out your donuts in PostGIS
I tried it on PostGISonline.
To do the same test you go to:
http://postgisonline.org/map.php
There is some polygons called "property"
print:
SELECT …
- 13.3k
3
votes
Lines to Polygons
"converting lines to polygons" depends more of the format than polygon/linestring representation. … I mean going from:
LINESTRING(1 1, 2 2)
LINESTRING(2 2, 2 1)
LINESTRING(2 1, 1 1)
to:
POLYGON((1 1,2 2,2 1,1 1))
is converting line to polygon, but isn't what you are talking about I guess. …
- 13.3k
3
votes
Optimizing a nearest neighbor calculation using PostGIS
That is because polygon to polygon calculations is much faster since 1.5 if their bounding boxes doesn't intersect.
You can read more about that here..
The third thing to mention is the future. …
- 13.3k
10
votes
Accepted
Filling a polygon with lines using Postgis
x_max from
(SELECT the_geom AS the_polygon FROM lakes) l
Next step is to build lines from those coordinates and and use ST_Intersection to only get the parts of the lines intersecting the polygon …
- 13.3k
2
votes
Web service to see postgis polygons
postgisonline is for things like this.
go to http://postgisonline.org/map.php and paste your code.
But you have to write it as a query understandable for PostGIS and call the geometry the_geom.
Then …
- 13.3k
2
votes
Algorithm to find polygons enclosing points
from a database perspective it sounds like you want to group the points on the ilands and make a convexhull on each group.
in postgis it would look something like:
SELECT ST_Convexhull(ST_Collect(p. …
- 13.3k
2
votes
How to bring polygons closer to a point?
making the polygons bigger should give the desired effect.
http://postgis.net/docs/manual-1.5/ST_Scale.html
/Nicklas
- 13.3k
0
votes
How to get MultiPolygon from MultiPoint for area calculation in Postgis?
Assuming your points is ordered so they define a polygon, you can combine
ST_LineFromMultiPoint
with
ST_Polygon
You will not get a multipolygon from this but a polygon. … To build a multipolygon which actually have more than 1 part you will need to define how the points shall be divided into sub polygon parts. But I guess that is not what you want. …
- 13.3k