PostGIS is an extension for the PostgreSQL object-relational database that adds support for geographic objects.

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How to add Routing Table Query-Result on pgrouting?

I've followed the pgrouting latest workshop http://workshop.pgrouting.org. I wanted to know how to add the routing table query-result into my webpage directly after the route showed up? regards
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680 views

overlay my shapefiles stored in database to the web/browser [duplicate]

I am very much strrugling on how to display my shapefiles stored in postgis database to the browser or to the web.. is there anyone there knows how to do it.? I am using geodjango framework in python,....
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240 views

Fastest way to add shapely geometries to a PostGis database using geoalchemy2

I am looking for the absolute fastest approach to adding +10,000 shapely geometry objects to a PostGIS database using geoalchemy2. I'm having no speed issues when uploading to a localhost postgres ...
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2answers
146 views

sql query to get origins and destinations

I have a table of cities with an ID and geometry (200K rows) and a table of travels, with only two ID: idfrom, idto (7K rows) I'm wondering how could I select the geometries for each one in order to ...
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273 views

Cannot read postgis RASTER into ArcGIS using the interoperability extension, either directly by Query Layer

This post accessing postgis raster data using Query layer in ArcGIS was created in Jul-12. Since then, I have not found any other related-post published. Using QGIS with DBManager ON, my postGIS ...
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222 views

retrieving polygon shapes from postgis in geodjango [closed]

Can anyone explain how to extract polygon shapes that are stored in a PostGIS database and display it in the browser? I am using geodjango framework in python. I would like a step by step guide on ...
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2answers
496 views

How can I create a hexbin layer using the SQL and CartoCSS parameters in cartodb.js?

CartoDB has a great hexbin visualization wizard baked into the client dashboard: However, I like using cartodb.js to customize events and interactions; in particular, I'd like to make styles ...
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29 views

How to find & send alert SMS for next bus stop in a GPS tracking system (PostGIS DB)? [duplicate]

In my gps tracking system, I have got 5 Stops for a vehicle. Whenever the bus reaches stop 1, the passengers at stop 2 should get an SMS alert. And in the same way for the sops followed by. Stops ...
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5k views

How do I check which version of GDAL I have and how many?

I have installed in my computer the following software: PosgresSQL 9.3.2.3 PostGIS 2.1.1.1 QGIS 2.0.1 Dufour (this one installed through the OSGeo4w package) QGIS 1.7.0 Wroclaw As far as I know ...
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1answer
294 views

Homogeneous vs Heterogeneous schema in Postgis

Introduction I'm working on creating a spatial database in Postgis, to be viewed and edited trough QGIS to help managing some farmland areas. One of my goals is the have a centralized place where ...
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113 views

PostGIS replace view crashes PostgreSQL server from ArcGIS script

I have the following script which when from ArcGIS (and a similar script from a QGIS plugin) will update a view. Every so often (around 1 in 5 times the script is run) it causes the PostgreSQL ...
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2k views

Multipoint vs point PostGIS

Is it normal to use the geometry type 'multipoint' instead of 'point' knowing that I use it to store only one point. How can I convert from multipoint to point
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469 views

Cannot upload an IMG file into PostGIS using raster2pgsql

I cannot upload into PostGIS a raster with the following code: raster2pgsql -s 4326 -I -C -M "C:\lyr\gebco.img" -F public.gebco ¦ psql -d test -U postgres -W It says ERROR: Unable to read raster ...
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1answer
144 views

Postgis geometry type = Geometry

Simply I've got a number of PostGIS layers that have a geometry type of Geometry, as a posed to point, line, polygon. wkb_geometry geometry(Geometry,27700) QGIS 2.0+ doesn't like this very much ...
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2answers
83 views

how to specify -t critical dowloading raster with raster2pgsql

I'm trying to download a raster into postgres/postgis. So far I wrote: raster2pgsql -s 3006 -I -C -M -R filename.tif -F -t 463.313x463.313 schema.rastername | psql -h localhost -U postgres -d db ...
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160 views

How to use osm2po to solve TSP

I've got a TSP to solve. I created a routable street graph using osm2po and imported the result to PostGIS. On my PG db I installed the pgrouting extension (over PGAdmin3 GUI --> right click Extension-...
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418 views

Aiming to retrieve source and destination from Android, use pgrouting dijkstra to find shortest path and display it back on Android

I have created an Android application that will accept source and destination from the user. It then calls a php page which takes in the lattitude and longitude of the destination and the source. I am ...
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530 views

Distance between Paris and San Francisco with PostGis (out of range coordinates?)

SELECT ST_Distance(gg1, gg2) As spheroid_dist, ST_Distance(gg1, gg2, false) As sphere_dist FROM (SELECT ST_GeographyFromText('SRID=4326;POINT(37 -122)') As gg1, ST_GeographyFromText('SRID=4326;...
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2answers
608 views

Distance between Polygone and Point [closed]

I am working on a query to find the closest point between polygone and point Can I use this operator to calculate the distance: SELECT a.point, b.poly FROM tableA a, tableB b WHERE ...
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3answers
1k views

clustering points in postgresql to create contour map

UPDATE: To try to make this a little more simple, is it possible to create a query which selects a group of points such that each point in the group is at most X units away from at least one other ...
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128 views

How can I obtain the unit of a projection SRID?

Given a projection SRID, is there a way I can obtain the coordinates unit string (meter, degree, ...) ? In PostGIS for example, it looks like it is present in the srtext column of spatial_ref_sys. ...
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363 views

Can't create view in postgresql

I have a PostgreSQL table containing some point of interest data. I have a second table with overlapping continent polygons. The following code splits the POI into the continents, but instead of ...
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1answer
967 views

Shortest Path Dijkstra

I would like to calculate the shortest path with dijkstra algorithm. sample query SELECT seq, id1 AS node, id2 AS edge, cost FROM pgr_dijkstra(' SELECT gid AS id, ...
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249 views

QGIS with CH1903/LV03 and WGS84 layers

I have a few CH1903/LV03 layers (lake, river and the country border of Switzerland) and a layer in WGS84 (two points of two cities, Vaduz and Bregenz). On-the-fly-transformation is activated but ...
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137 views

Postgis how to add a vertex to a linestring at intersection with a point?

I'm using postgis 2.0 and I want to add a vertex to a linestring (pipes) at intersection position with a point (startpoint of waterlateral). Can anyone help?
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168 views

How to cut/split multipolygon with blade (linestring) into two pieces using PostGIS? [closed]

I struggle to do split operation in postgis I tried to build a query but Im always fail. Id like to cut a multipoligon with a blade (a linestring) into two pieces. These two objects have specific ...
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2answers
299 views

Why are there blank in the ST_AsGeoJSON results?

I have a vector layer tipor several polylines. I opened this layer in QGIS and exoportar to a spatial table in PostGIS. ST_AsGeoJSON want to use the function to get the GeoJSON to draw on Google ...
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452 views

How to create a regular polygon grid in Openlayers?

I am trying to create a grid in my map and do some calculations. I seen the following links:- Create regular polygon grid using postgis Create regular polygon grid inside a polygon using postgis ...
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1answer
450 views

plpgsql | before update trigger: insert the new pseudo-record in another record and leave the old one as it was

I've got the following table: CREATE TABLE alumbrado_puntos_luz ( id numeric(8,0), "GEOMETRY" geometry, revision_actual numeric(10,0), revision_expirada numeric(10,0), CONSTRAINT ...
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1answer
129 views

Rewrite query to match two points with a linestring in a different database table

OK, not sure if I've worded the title brilliantly, but here goes: Suppose I have: a table "gps_nodes" containing columns: "EASTING" (containing longitude data) "NORTHING" (containing latitude ...
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1k views

Importing multiple shapefiles into single PostGIS table

I have a folder full of shapefiles that I want to import into a single PostGIS table. This table should have the following columns: id, filename, multipolygon I can bulk import all shapefiles using ...
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131 views

Extract city boundary from TIGER data

I'm trying to find the bounding box of US cities but I just can't seem to figure out what to do with the TIGER data I download (not to mention, which data to download!). Could someone experienced with ...
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201 views

Traversing all possible road routes

I have created a topology from OSM data and would like to simulate a car driving every possible route along the map. The purpose is to "survey" the osm data as if in a car. My ultimate objective is to ...
4
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1answer
1k views

PostGIS intersection function

I have a problem with intersection function. I built my query following http://manual.linfiniti.com/en/postgis/geometry.html, 5.7 section. I made my clip object, a red linestring frame: But after ...
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1answer
535 views

Error: Coordinate values are out of range [-180 -90, 180 90] for GEOGRAHY type on Postgis?

when I run a query on Postgis select st_astext(ST_SetSRID(f.geom,4326) ),st_astext(st_centroid(ST_Transform(b.wkb_geometry,4326))) from a,b where ST_Distance_Sphere( ST_Transform(a.geom,4269),...
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127 views

How to get intersected points between polygon and line in desired order

I have polygon for example "POLYGON((5 1, 6 1, 6 5, 5 5, 5 1))" that I want to intersect with line "LINESTRING(0 2, 10 2, 10 3, 0 3, 0 4, 10 4)" and get intersection points in the order that they ...
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2answers
4k views

PostgreSQL function does not exist

I have PostgreSQL 9.2 with Pgrouting extension, but when I want to call a function(pgrouting) does not work. Id like to compute the shortest path between two point. SELECT gid, AsText(the_geom) AS ...
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1answer
913 views

pgrouting php problem “pg_fetch_result(): Unable to jump to row 0 on PostgreSQL result index 3”

I'm trying to build a simple routing web-app using pgrouting, followed some tutorial and the latest workshop. Because I'm using PostgreSQL 9.3(x64), Postgis 2.1.1, and pgrouting 2.0 so I did some ...
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3answers
2k views

How to import shp2pgsql on mac?

I am using EnterpriseDB to run Postgis. when I run "shp2pgsql" on got an error message. ~ macbook$ shp2pgsql -bash: shp2pgsql: command not found ~ macbook$ which shp2pgsql I read that I should ...
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69 views

PostGIS layer attribute table empty in Quantum 2.0.1

I recently installed QGIS 2.0.1 (Dufour) on a Windows 7 PC (64-bit). Today I tried, for the first time since Dufour was installed, to load PostGIS layers into QGIS. I successfully set up a connection ...
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129 views

How to force dropping a table/Index

I was working to import CSV Files into PostGres. CREATE TABLE NY(Name varchar,Latitude float,Longitude float); COPY NY FROM 'data/NY.csv' DELIMITERS ',' CSV; ALTER TABLE NY ADD COLUMN gid serial ...
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1answer
311 views

Spatial Join in CartoDB

I need to update a table of points with the FIP code of the nearest county polygon from a separate table. I've managed to update the column for those points that Intersect a county polygon with this: ...
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740 views

Draw postgis geometries in google maps api

Postgis have a base with a table of data lines and other points. I'm doing a java applet to query these tables and space to draw on google maps. My question is: what better way to spend these ...
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692 views

Finding the Closest Points using ST_ClosestPoint() for MULTIPOLYGON

I am working to match between the closest points of two tables. I have two tables: Building, SchoolBuilding. Building Table: Contains Polygones, SchoolBuilding Table: contains Points (From Lat/Long)....
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1answer
448 views

Transferring data between spatial databases

I would like transfer spatial data from PostGIS to Oracle Spatial. I want to use Python's modules psycopg2 and cx_oracle. Transfer Oracle > PostGIS is OK, but in opposite version I have problem with a ...
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1answer
315 views

how to snap two line vertex in two different layers used in QGIS

I want to snap between two poly-lines from 2 different layers (Layer1 in Brown and Layer 2(postGIS layer) in Pink color- ), but my snap option don't work. I have changed the tolerance to different ...
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1k views

Indoor mapping with floor plans and item(s) to track

Warning: GIS noob here. Essentially I want to be able to create a floor plan for a given room. Consider the following image of a floor plan in image format: I would have the measurements of every ...
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3answers
163 views

What is the PostGIS 2.x equivalent of the pre-PostGIS 1.5 ~= operator?

Stemming from my other question: When would a PostGIS geometry compare using ~= return true when ST_Equals returns false?, what is the PostGIS 2.x equivalent of the pre-PostGIS 1.5 ~= operator? It ...
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2answers
251 views

Import CSV file into Postgis DB with Location-field formatting?

I am working to import CSV into table in my Postgis Database. First, I created the table Create Table test ( name varchar, created_date Date, location double precision ); When I excuted the ...
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4answers
159 views

Best way to 'join' polygons

I'm looking for the best ways to 'group' a budge of block polygons in a new polygon that should be the town. My block layer is something like this: Or zoomed: And I'm looking to get something ...