Geometry Processing Functions and Spatial Joins in PostGIS | QGIS | 18 |

Описание: Material for Practice: https://gisschools.com/course_details...

In this video, we delve into the world of geometry processing functions and spatial joins using PostGIS in QGIS. We explore various functions that return geometry values and how we can utilize them to perform spatial operations.

Chapters:
0:00:19. - Understanding Geometry Processing Functions
0:00:24 - Exploring Relationship Predicates
0:01:00 - Introduction to ST_Buffer Function
0:01:26 - Understanding Geometry Returns
0:02:01 - Parameters of ST_Buffer Function
0:03:17 - Introduction to ST_Intersect Function
0:03:32 - Exploring Intersection Results
0:04:11 - Introduction to ST_Difference Function
0:04:44 - Understanding Set Difference
0:05:31 - Introduction to ST_Union Function
0:05:53 - Understanding Geometry Union

-------------------- queries ----------------------

--Buffer
select row_number() over() as gid, geom,buf_size from (
(select st_buffer(st_transform(geom,32643), 2) as geom, '2' as buf_size from tbl_trees)
union all
(select st_buffer(st_transform(geom,32643), 4) as geom ,'4' as buf_size from tbl_trees)
union all
(select st_buffer(st_transform(geom,32643), 6) as geom , '6' as buf_sizefrom from tbl_trees)
) foo order by gid
------------------
--intersections
select row_number() over() as gid, ST_Intersection(tbl_streets.geom, tbl_boundary.geom) as geom
from tbl_boundary
, tbl_streets
------------------
--difference
select row_number() over() as gid, st_Difference(tbl_streets.geom, tbl_boundary.geom) as geom
from tbl_boundary
, tbl_streets


#Relationships #Geometry #Geography #ST_Intersecion #ST_Difference
#ST_buffer #ST_split #ST_SymDifference #ST_Subdivide #ST_DWithin

Search Terms: Geometry Processing Functions, Spatial Joins, GIS, Spatial Data Analysis, Geospatial Relationships, Point, Line, Polygon, Buffer, Simplify, Intersects, Contains, Within, Data Enrichment


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