PostgreSQL is an open source object-relational database system.

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22 views

pgrouting floyd-warshall with spesific start & end

I'm implementing floyd-warshall algorithm for the shortest route in the road network using pgrouting plugin. how to determine the specific start and end points?
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27 views

How cut multilinestring by 2 points on postgis?

I know how cut linestring by 2 points, easy: ST_LineLocatePoint,ST_LineSubstring. But i have unmerged multilinestring, few lines are not connect?
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1answer
45 views

Postgre/PostGIS - How to find points inside an area

I have a database of clients/users with their coordinates. I would like to select all clients within the marked area. Query: SELECT * FROM clients INNER JOIN polygons ON polygons.polygon @> ...
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0answers
26 views

Insert shapefile drawn features into PostgreSQL

Sorry my question is repeated, unfortunately i didn't get the proper solution for the problem. I have a LeafLetjs map on which I draw features like: points, polygons, markers, lines etc and I am ...
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1answer
31 views

How to check point intersection with bbox made from two points?

I have two points which represents lower left and upper right point of BBOX. I have one point which SHOULD be somewhere inside and I want to test it. I have all of them as 'geometry(POINT, 4326)' ...
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0answers
42 views

How can I add the PostGIS extension?

I'm experiencing difficulties when trying to add the PostGIS extension to PostgreSQL. I wasn't able to add the extension during the installation because of an error. Now I'm trying to add the ...
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1answer
25 views

Identify groups of stacked geometries in PostGIS

I need to create a column in my PostGIS table with values identifying different groups of stacked/duplicate geometries, such that one group of stacked geometries might get a value of 1, another group ...
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2answers
46 views

Conditional “On the Fly” Column with PostGIS

I have two tables I am working with; tl_2015_us_county which consists of county polygons, and tl_2015_48_puma10 which consists of PUMA polygons. I am currently using the below SQL in order to achieve ...
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1answer
57 views

LeafLetjs: GeoJSON invalid object error

I am getting GeoJSON data from postgresql, but it seems to be invalid. How can I validate it? After getting GeoJSON format data I want to put on map for projection. I am using LeafLet, java EE, ...
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1answer
49 views

How to create a polygons (squares) from point

I want to create a regular grid of polygons/squares from this point knowing that between two successive points 100 meters, so each square would have 100*100 m2 in its area.
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6 views

Grouping data by year based on two timestamp columns in Postgresql [migrated]

My DATA table has the following columns: id INTEGER, name TEXT, created TIMESTAMP, deleted TIMESTAMP I want to product a report of the count of each name (which can appear several times in the ...
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0answers
51 views

Cursor help on large spatial query in PostgreSQL

I have two very large tables on which I want to perform a spatial query. UPDATE table_a SET att_1 = b.att_1, att_2 = b.att_2 FROM table_a AS a JOIN table_b AS b ON ...
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0answers
31 views

connection error between Mapserver and PostgreSQL database [on hold]

i use mapserver and postgresql to create my website and publish shapefiles. I want to do a small test by execution the PHP file and call my mapfile but i got an error the shapefile that i want ...
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1answer
51 views

Change SRID of geometry column

I have in my table column geom with geometry, data type of this column is geometry(Point,102067). I want to change SRID from 102067 to 5514, but if I use this command select ...
7
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1answer
1k views

Could not load library “C:\…\ rtpostgis-2.2.dll”

I've installed PostgreSQL with Postgis (tried both version 9.4 and 9.5 ) on a remote desktop running Windows 7 64bit. However, when I executed this SQL command: "CREATE EXTENSION postgis" (on ...
2
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0answers
61 views

Insert shapefile draw features into PostgreSQL database using java EE (pragmatically)

I am working with PostgreSQL 9.4 and Java EE i want to insert shapefile or layer's features into PostgreSQL, is there any solution so i can insert the whole shapefile into database. OS Windows10. ...
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1answer
53 views

How to USE ST_difference AND ST_intersection in case of multipolygons ? (POSTGIS)

I try to use ST_difference and ST_intersection with two layers of multipolygons. I want something like: With the input on the left and the result on the right. MY DATA: t1.geom contains 1000 ...
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0answers
41 views

Is PostGIS / PostgreSQL UK Public Sector Network (PSN) compliant?

Is PostGIS / PostgreSQL UK Public Sector Network PSN compliant? ... specifically so it can be used in a UK local government council?
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1answer
40 views

Geometry type and create trigger for that in postgresql

I want to create a trigger (before inserting trigger), to check the geometry type weather it is point, polygon, line, or multi-polygon. After that, I want to set the color property. How can I do this ...
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1answer
38 views

How to use gdal_rasterize with postgis vector?

I'm trying to convert a multipolygon vector layer to a raster using the GDAL tool gdal_rasterize. The command I am using is: gdal_rasterize -b 1 -burn -9999 PG:"dbname=db password=password" \ ...
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1answer
34 views

Adding a column to polygon table with correct corresponding address

I have 2 shapefiles: one with polygons (buildings) and their properties other one is a point address shapefile - it contains points that are inside polygons from the other SHP, but it's still ...
2
votes
1answer
28 views

Why am I getting a syntax error at “RETURN result;” when creating a CartoDB pl/pgsql function?

Despite CartoDB appearing to run PostGIS 2.2 (see below), it still doesn't support multi-point geometries in ST_Split. SELECT postgis_full_version(); POSTGIS="2.2.0" GEOS="3.5.0-CAPI-1.9.0 r4084" ...
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2answers
82 views

Change case of Acronyms in PostGres

I have a table containing almost 1 million points (POIs). I want to change the case of all the acronyms in the display name column I have, currently I am identifying the acronyms as any 3 letter words ...
0
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1answer
24 views

SQLAlchemy Error on insert

I am trying to add a point with GeoAlchemy 2. However I am getting getting error on insert action saying ---sqlalchemy.exc.InternalError: (psycopg2.InternalError) parse error - invalid geometry ...
0
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1answer
36 views

Converting files with ogr2ogr and dropping ALL attribute fields

I want to add a gpx file to a PostgreSQL/PostGIS table using ogr2ogr, but my table does not have any of the fields that are attributes of the GPX file. There are previous questions here dealing with ...
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1answer
23 views

Storing bounding box in database (mariaDB)?

Is there a bounding box type or a nearest equivalent for specifying a column the will store an extent (SE-NW) and how would I then query the database to find entries where a point exists within it? ...
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1answer
36 views

ERROR: syntax error at or near “group” LINE 4: …E ST_DWithin [closed]

I'm writing an SQL query but I am getting a syntax error on the line with the GROUP BY. What can possibly be the problem? UPDATE intersection_points i SET nbr_victimes = sum(tue+bl+bg) FROM ...
2
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2answers
149 views

points within a polygon

Since I am a beginner to postgis I am facing problem with finding points within polygons from my table. This is my table structure Column | Type | ...
2
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0answers
23 views

Can't delete postgis

geo2=# create extension postgis; ERROR: PostGIS is already installed in schema 'public', uninstall it first geo2=# create extension postgis_topology; ERROR: required extension "postgis" is not ...
6
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1answer
97 views

Direct Connection from Postgres to ArcGIS results to two feature classes per table

I'm using ArcMap (10.3.1) to connect to Postgres (9.4.5), which has Postgis version 2.2.0 installed. Create/Enable Enterprise Geodatabase wasn't used in this database. It's just a connection to the ...
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0answers
36 views

Calling cmd command from stored procedure in PostGIS

How to execute the command prompt from stored procedures in PostgreSQL. Below is cmd command to convert PostGIS data to image: PG:"host='<host>' port:'<port>' dbname='<dbname>' ...
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1answer
84 views

run command line shp2pgsql in c# function?

i'm developing an application web with asp.net/c# and i would in a button importing the shapefiles into postgis, and i'm trying with this code, this code i'm using it in cmd.exe in windows it imported ...
5
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1answer
56 views

What is the best way to merge lots of small adjacents polygons ? (POSTGIS)

I am looking for a way to merge lots of small adjacents polygons. I have this kind of features: So if my polygons are adjacents AND have the same color attribute then I want to merge those ...
3
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1answer
83 views

ST_Transform doesn't work in PostgreSQL

When i run the query with ST_Tranform I get this error: Input geometry has unknown (0) SRID SQL state: XX000 How can I resolve this error? I want to convert from UTM into geographic lat/lon. ...
1
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2answers
69 views

Simplify geometries but keep them contiguous

I have several detailed contiguous areas. I need to turn each one into KML, but when I do so, the end result is too large (in terms of memory). Using PostGIS I need to simplify these geometries but ...
2
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1answer
57 views

Update one table from another based on spatial join

In beginning i had two tables of points and i wanted create from one of this POINT table new table CIRCLES which will contain circle polygons 300 metres around points. This step i have done here: ...
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0answers
98 views

How to calculate width and lengths of street layer in Postgis/PostgreSQL?

I was able to project the point location (ad.shp) to the nearest street (line.shp) like this. My approach was like this. I used ST_ClosestPoint() to iterate this for every point location within a ...
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1answer
33 views

Using Postgis spatial index in st_distance operation based upon explicit SRID column

I have two large tables with data that spans over multiple regions of the U.S and needs a defined SRID column in atleast one the tables to denote which coordinate system should be used for ...
1
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1answer
34 views

Transform Natural Earth data to 27700

I'd like to know how (if possible) to transform the shapefiles I've downloaded from the natural earth datasets which are in EPSG:4326 to BNG EPSG:27700. So far I've loaded the shapefiles I need into ...
1
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1answer
25 views

Parting lines based on intersection with polygons

I have two tables: roads containing one row (line) for each road with column road_code uniquely identifying the name of the road; districts containing one row (polygon) for each district with column ...
1
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2answers
34 views

How does pgr_createTopology assign source and targer?

This is the first time I post a question here. I was following the tutorial from Anita Graser http://anitagraser.com/2013/07/06/pgrouting-2-0-for-windows-quick-guide/ , on a roads table which ...
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0answers
10 views

Geoserver homebrew memory problems

I have installed Geoserver 2.7.1 with homebrew on OS X 10.10.5. I have problems with the server crashing almost daily. A restart of the launchctl scripts does not always work so I have to do a full ...
3
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1answer
65 views

Projecting points towards selected line layer in PostGIS/PostgreSQL

I have a point layer (ad.shp) and street layer (st.shp) and I am trying to project the points to the selected street in a distance of 20 meters (snapping all points to the lines within 20 meters) ...
0
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1answer
34 views

Importing information on bridges into postgis-table using OSM2PGROUTING

In OpenStreetMap (OSM) road data there is information about whether or not a road feature is a bridge or not (boolean). However, when importing into a postgreSQL data base for routing (pgrouting), ...
3
votes
1answer
61 views

QGIS Add feature python script

New to python, and been looking at this for a while, trying to write a scrip to automate a process we need to carry out in QGIS a few thousand times. As part of this I need to create a feature into an ...
4
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2answers
123 views

Filter data with PostgreSQL or geoserver?

I'm working on a PostgreSQL database with PostGIS. I need to filter an 8 million records table in order to publish a view through geoserver. I know two ways to do that, one is that I create view in ...
4
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1answer
107 views

How to conveniently generate a Google Maps link from a PostGIS geometry?

When working with a spatial database, it is often convenient to make a sanity check for a location of a point by viewing it on Google Maps (or any other online mapping service). Copying the lat/lon ...
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2answers
56 views

PostGIS bbox with two tables

I am new to using PostgreSQL/PostGIS. I have two tables that I've imported from two shapefiles. One table is based on points called "shape_points" and the other based on polygons called ...
2
votes
2answers
85 views

Why does FeatureClassToFeatureClass work in ArcMap but not in Python script?

When trying to copy a feature class from an SDE connection file to a scratch GDB, the FeatureClassToFeatureClass_conversion works in the ArcMap Python window, but I can't get it to work in a Python ...
2
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1answer
37 views

Cannot generate nationscript.bat - Tiger Geocoder

I have been attempting to install tiger - geocoder in a postgres database. After muddling through examples and resources online for days I have been able to conjure up this much of the workflow. I ...