PostgreSQL is an open source object-relational database system.

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Defining a WHERE clause from a subquery for a query to create a handy view

It is about my implementation from an answer of this question. It is more an postgresql issue than a GIS issue, whereas it is about geometries and spatial queries. I want to create a view from the ...
1
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0answers
217 views

Upgrading Postgres database to Postgis 2.1.1

I executed the postgres 9.1.6 with Postgis 1.5.8 dump from a remote server on Linux pg_dump -h localhost -p 5432 -U postgres -Fc -b -v -f "/somepath/tumidb9.1geom1.5.8.backup" tumidb9 So I have a ...
2
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0answers
208 views

Styling river charts with TileMill - issue with filling a polygon made of disjoint line segments

I am trying to style inland river charts produced by the Army Corps of Engineers. I imported the vectors into Postgres, and I’m using TileMill to style the data. I am having trouble correctly filling ...
0
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1answer
623 views

ogr2ogr DXF to PostgreSQL some LINESTRING coordinates mirrored to the negative longitude

I have been using ogr2ogr GDAL tool to migrate geospatial data from DXF file to PotgresQL database without much problems. But now there is a special problem I can not fix. I have a DXF file with ...
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2answers
571 views

getting data into geoserver from two columns to form a point

I have a problem on how I am able to retrieve a geometry data from postgres using geoserver. I am new to this. The latitude and longitude are on separate columns. So I'm trying to figure this out by ...
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1answer
493 views

Create a View with a new geometry field in PostGIS

I have a table in my data base. This table was created with differents fields as 'x','y' and 'z'. Now I need to make a view to generate a geometry column, but I found problems, because the created ...
1
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1answer
115 views

how can I assign an id column in sql query that merges geometries

I have a layer that consists of a number of features. Each features is a line segment and has an attribute named zone_name which takes one of 7 values. What I want to do is to use the atlas ...
0
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1answer
194 views

How to format SQL expressions for ArcPy with ArcSDE for PostgreSQL feature class?

I'm trying to use SelectLayerByAttribute to find the last point added to a FC. I figured I could use the objectid field because it's serial. I wrote the following: ...
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1answer
185 views

Clip geometries in table based upon value

I have defined a view in postgres that returns a set of polygons and can be queried as follows:- SELECT wkb_geometry, grade_count FROM ng_schema.grade_count_report [sql.where] order by grade_count ...
3
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2answers
949 views

How to connect Microstation V8i to Postgresql?

I have been searching the web trying to find out if any one has connect Microstation to Postgresql, and to my surprise there has not been alot of chatter on ways to do this.. When looking at the ...
1
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1answer
94 views

Google Map API and OS Opendata in QGIS

I'm new to gis and having problems with matching reference systems for my two data sources. I have downloaded some OS Vectormap data which I believe is in 27700.. And I have some longitude and ...
4
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2answers
9k views

Installing postgis on postgresql 9.1 not working

I'm trying to install Postgis 2.0 on a perfectly functionig postgresql 9.1.10 database. I installed the package via: richard@srv1:/$ sudo apt-get install postgresql-9.1-postgis postgis Reading ...
8
votes
1answer
934 views

Performance in calculating raster statistics in PostGIS

I'm trying to calculate raster statistics (min, max, mean) for each polygon in a vector layer using PostgreSQL/PostGIS. This GIS.SE answer describes how to do this, by calculating the intersection ...
1
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1answer
289 views

Load partial shapefile into Postgis / GeoDjango project

I have a shapefile with Canadian postal codes, but am only looking to load a small subset of the data. I can load the entire data file and use SQL or Django queries to prune the data, but the load ...
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2answers
1k views

How to generate one geojson file from several rows in Postgres/PostGIS?

I have a table with geospatial objects, in particular, polygons. I know that I can generate from one row a geoJSON string using ST_AsGeoJSON(http://www.postgis.org/docs/ST_AsGeoJSON.html). But I would ...
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2answers
229 views

How to convert WKB to radians or utm in postgresql?

I am using PostgreSQL with postgis, the geometries are in UTM and stored as WKB with several shapes types (point, polygon, linestring...). Is there a way to convert the WKB to a list of points in ...
2
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1answer
188 views

St_OffSetCurve with self-crossing lines

I have about 50,000 linestrings in PostGIS. They represent routes along roads. But I want them to be (roughly) pavements (aka sidewalks) instead. So I need to move all the lines 3 metres to the left ...
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1answer
231 views

I am having Problem with my geoserver using URL

I am having problem when I am Requesting following URL in GeoServer /geoserver/wfs?REQUEST=GetFeature&VERSION=1.1.0&typename=Final&propertyname=name I am getting following error ...
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0answers
65 views

Selecting a bounded area within a raster

I am new to postgresql. I have imported a 256kb sample raster (.tiff) into postgres with tilesize 100x100. Now I need to select the area (rectangle) from the center of the image using sql query. Then ...
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2answers
291 views

PostGIS extension not available in Postgresql list

I have installed Postgresql 9.2 from graphical installer in Ubuntu 13.10 and Install PostGIS 2.0.3 through StackBuilder. All things went smooth. But it is not possible to create PostGIS database as ...
0
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1answer
450 views

Pgrouting functions and geoms type not found. Install failed?

I have installed a postgresql 9.1 and postgis 2.0 from source. I couldn't launch this : # Add pgRouting launchpad repository ("stable" or "unstable") sudo add-apt-repository ...
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0answers
33 views

How to install Postgresql and postgis on Ubuntu 13.10? [duplicate]

Dear all open GIS geeks, I have upgraded my OS from Ubuntu 12.10 to 13.10. I had a clean installation of 13.10 version. Can someone please suggest which version of Postgresql and PostGIS can be ...
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votes
2answers
684 views

How to add sfcgal to an already postgis enabled database

I have a postgres 9.1 database with postgis 2.1, and I recently needed to add sfcgal to it, so i rebuilt postgis 2.1, but I can't find out how to update the postgis extension in postgres without ...
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2answers
56 views

How can this Postgresql be solved [closed]

I am new in Postgrsql. I am trying to Insert few records in a column. I have a where condition. I am trying the following code INSERT INTO table_name(column_one) VALUES ('1000') (SELECT * ...
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1answer
1k views

PostGIS ST_Contains Function Error

I am running the below query and try to identify the end point of a line with gid 338 on the polygon's boundary with gid 1456 but got some error message: SELECT public.st_contains((Select ...
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1answer
91 views

Identify the direction of traveling road segment

I'm using pgRouting to find the least congested path using time as the cost metric. I am using average speed between two nodes to calculate time taken to travel in a segment. In pgRouting there is a ...
3
votes
1answer
2k views

Missing libraries when upgrading to PostGIS 2.1 and PostgreSQL 9.3.1 using homebrew

In the process of upgrading my PostgreSQL from version 9.2.4 to 9.3.1 (via homebrew on OS X) I came across an odd problem. These are the steps I took so far PostgreSQL, PostGIS and required ...
2
votes
1answer
4k views

Postgres casting between varchar and double precision suddenly stopped working

I have been importing data into PostgreSQL tables all day using ogr2ogr and then spatially enabling the data with no issues up to now. I have been cutting and pasting the code and this is what I have ...
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0answers
3k views

Postgresql Connection issue “unexpected EOF on client connection”

I'm using Tomcat, Apache (for Load Balencing),OpenLayers - 2.11,GeoServer 2.13, ExtJS 3.4, PostgreSQL 8.4,PostGIS 1.5 and Java for developing GIS based web applications. I have 2 Server. Server1 ...
4
votes
1answer
1k views

How to create linestrings with a definite angle and length, that are fixed to a point

I want to create linestrings with a definite angle (e.g. 160°) and length (e.g. 2m) that are fixed to a number of points of another linestring. So, I want to use the ST_DumpPoints function to find the ...
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0answers
72 views

Is it possible to have run-time dynamic table updates to visualization using javascript interacting with postgis and geoserver

I have an idea of/have seen implementations, of dynamic map retrieval/updating using wms on openlayers by using updates to a postgis database which was hooked into geoserver and having a refresh ...
2
votes
2answers
180 views

Migrating to the use of databases over shapefiles in QGIS

I mostly use ArcGIS at work and am digging into QGIS at home and for my business. At work we are phasing out the use of shapefiles and moving towards geodatabases. So I am thinking I should look into ...
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0answers
19 views

Can't connect QGIS 2.0 to postgresql 9.3 remote server with postgis 2.1 [duplicate]

I am trying to connect qgis to my postgresql server using the add postgis layer option in qgis dufour. I am not getting any details from qgis other then 'connection failed check settings.' However, ...
2
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3answers
461 views

PostgreSQL Queries, how can I handle logic and complex mathematical functions to update a column

I have a Postgres Table of u and v wind velocity components as follows: ugrid vgrid -2.7 -6 -2 -6.3 -1.7 -6.4 I need to calculate the speed and direction as per the JScript Psuedocode ...
3
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2answers
168 views

Consolidating Table rows in Postgres/PostGis

I have a table of weather data as follows: Table Name: WindGrib UGRD -179 -90 2.9 VGRD -179 -90 5.9 UGRD -179 -89 1.6 VGRD -179 -89 6.4 UGRD -179 -88 -4.2 VGRD -179 ...
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1answer
202 views

opengeo suite and pg_hba.conf

I need help with how to add access to my computer. When I edit the pg_hba.conf i still get the access denied error. I just want to give a specific ip access to all db and all users from that ip... ...
2
votes
1answer
2k views

Having trouble connecting QGIS with postgres database with postgis extension [closed]

I am working on Ubuntu Precise with postgresql version 9.3 and postgis 2.0. After initially starting my postgres database and eventually getting permission errors that would prevent postgres from ...
0
votes
1answer
121 views

PostGIS select sites within buffer

I have a WMS query (GeoServer) that returns info from my layer into a popup in Leaflet.JS.However I was wondering how would do this outside of leaflet, i.e. on a standard html/php page. I assume I ...
3
votes
1answer
623 views

Snapping points to nearest road

I have a small table of 10 cities (in one table) that I am snapping to the nearest road (in another table) with the following select and storing the table snapped_cities: Select b.id, ...
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0answers
38 views

What is the best way to manage permissions as root installing postgresql and postgis?

I've encountered an issue numerous times where I lock myself out of my postgres installation as a result of modifying my pg_hba.conf file and therefore screw up my postgres installation because I ...
2
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0answers
126 views

Is the postgis layer option in qgis 2.12 Lyon two way? Was the spit plugin built in?

I am trying to install Postgresql with Postgis on a remotely accessed terminal only installation of Ubuntu 14.04 that I want to use to connect to QGIS 2.12 and hopefully have a two way transfer ...
3
votes
4answers
3k views

Postgis shapefile loader 2.1 error: dbf file can not be opened

The .shp, .dbf and the rest of files are fine, I open them in QGIS, AGOL with no problem. In fact, I've tried 3 different layers, and get always the same error. Anyone can please help, as I really ...
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1answer
70 views

Transform an Irish grid reference (29903) into UK grid reference (27700) on insert

I have an insert script to input several hundred points, however some of the points use the Irish Grid Reference system. I have separated these out however was unsure how to convert or transform? ...
10
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1answer
1k views

Materialized View Does Not Appear In Geometry_Columns View

I have defined a materialized view in a PostGIS 2.1-enabled database running PostgreSQL 9.3.1: CREATE MATERIALIZED VIEW canvec_data.contours_m AS SELECT contours_original.ogc_fid, ...
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2answers
838 views

Extract a LineString from LineString by two Points

I am using PostGIS2.0 and PostgreSQL9.3. I have LineString in Spatial-Ref 4326 like geom:= ST_GEOMETRYFROMTEXT('LINESTRING(60.7014631515719 56.8441322356241,60.7023117507097 ...
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3answers
921 views

How to access qgis, postgis, etc in ubuntu through Amazon AWS

I'm new to programming; however i have been able to read and research the programs i need to set-up for a GIS system. I chose to use Geoserver (as WMS) Postgresql, postgis, Qgis and Openlayers. I am ...
2
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1answer
1k views

Problem with loading OSM planet into PostgreSQL

I try download OSM planet into PostgreSQL database. I do all steps from instruction http://switch2osm.org/serving-tiles/manually-building-a-tile-server-12-04/ I also modify string "kernel.shmmax" ...
4
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2answers
1k views

pgrouting 2.0 package for postgresql 9.3

I'm trying to install pgrouting 2.0 on a postgresql 9.3 database (with postgis 2.1). Are there any packages on ubuntu 12.04 or do I have to install from source? Is postgres 9.3 supported at all in ...
3
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3answers
712 views

osm2pgsql --hstore

I'm working with postgreSQL 8.$ and PostGIS and I need to import osm file to database. I tried it with utility osm2pgsql, but I have problem with hstore extension. Does anyone know how to solve this ...
3
votes
3answers
1k views

A linestring merger algorithm

I'd like to merge linestrings which touch, but do not cross. The linestrings share the same SRID and come from a PostgreSQL 9.2/PostGIS 1.5 database. Within the table I query are several line strings, ...