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

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Optimize PostGIS query, ST_Intersects - Raster and Geom

I am trying to run a spatial query between two tables. Table one (prism_ppt_monthly - see below for details) is monthly precipitation data. Table two (usgs_basin_boundary - see below for details) are ...
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How to organize lots of data in PostGIS?

I'm creating a PostGIS database which will hold thousands of different shapes (imported from Shapefile, GeoJSON, etc), and they'll stay there and be queried over time. Do I need to create a ...
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Find all polygons containing points specific criteria

I have searched for a bit, but couldn't find an answer for my question. So I have two tables (PostGIS), one containing points, and the other containing polygons. Right now i have this query for ...
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PostGIS for GPX analysis

I have GPX trails of vehicles/bikes of a particular city. Meaning, lat/lon, timestamp of bike trails from where a particular bike started and ended at different hours of the day. I have sets of these ...
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Make a line from a set of GPS points close to a specific GPS point with PostGIS

I have to develop a map-matching algorithm. By the moment I only match gps points with the closest road segment. I'm looking for a way to compare the directions between a gps point and a road to ...
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PostGIS Best Practices with thousands of entries [on hold]

I'm creating a PostGIS database which will hold thousands of different shapes (imported from Shapefile, GeoJSON, etc), and they'll stay there and be queried over time. Do I need to create a ...
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MultiPatch Shapefile import into PostGIS Database

I have geometry of buildings in Shapefile MultiPatch format. I want to import it into PostGIS database in the same format. Is that even possible? If yes, then how?
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GeoDjango and bug with bounding box query

Just some context first, I have a postgres database with PostGIS extension, running under a GeoDjango wrapper. I have a weird bug that hopefully someone can shed some light on. I'm running a query ...
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19 views

How to check if a node is in route computed with pgRouting?

I'm new to the GIS system and I'm following the pgRouting workshop. I've imported the locations of nodes (points, highway=street_lamp) using osm2pgsql. now I'm calculating a few paths between two ...
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1answer
36 views

Why can't I import my shp file into a postgis database with SRID 102631 using shp2pgsql?

Hi I have been trying to figure out the reason shp2pgsql isn't working when I try to import a shapefile with SRID=102631. I've had no problems with other SRIDs. For all shapefiles in 102631, I get ...
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45 views

Where to store lat/lon data with additional informations?

I have huge database of lat/lon GPS coordinate points. For every point, I have several other variables (height, surface type, temperature, pressure...). Also, data will be changed every day and old ...
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PostGIS - interfacing with CADCORP 7.1 and QGIS - user 'postgres' can import, but no other roles can

I'm new to PostGIS (reasonably) - but I'm plagued with one on-going problem: I'm able to access PostGIS from various GIS systems using the main 'postgres' user. Using a newly created user ...
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Importing map information with osm2pgrouting

I'm importing the cartography of Spain with osm2pgrouting. I want to import address information, that is, the tag addr = *. I modified the file mapconfig.xml follows: <type name="junction" ...
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OpenGeo Suite 4.0.1 Activating SSL for remote connection

I have installed OpenGeo Suite 4.0.1 on my Windows 7 OS and created a spatially database. Now i want to connect to my database remotely but then it seems like i have to generate a self-signed key. i ...
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How to specify the new layer type in writeOGR{rgdal}?

There is a task that we copy some polygons into postgis using rgdal package. I noticed postgis is strict with geometry type so that the new multi-feature layer type must be specified. I tested the ...
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Integrate Qgis project to web based google api [on hold]

I was planning to convert the shape file into KML which google map supports. However, my project also includes TimeManager and PostGIS database. How do I handle them?
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27 views

Field Collection App for Geoserver or Any OS GIS Server

I am looking for a mobile app/interface for field data collection and mobile editing of GIS data that relies/syncs back to some type of GIS server or database. I am aware of Fulcrum and AmigoCloud, ...
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PostGIS Topology Requires Admin

I am running PostGIS on an Ubuntu server. I am able to add the Topology extension via CREATE EXTENSION, but when I try to use it as anything other than an admin I am denied permission. I ran GRANT ...
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QGIS: Edits in attribute table are not updated in Postgis database. Why?

As the title say. I edit values in the attribute tables of my QGIS project but there is no update to the database. I refreshed in QGIS as well as the database. What else do I need to do?
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Displaying raster tiles from OSM data stored in a postgis server

I have been recently tasked with setting up a raster tile server that serves tiles from data pulled from a postgis store. I have managed to get a vector tile server up and running but I'm stuck on ...
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36 views

H2GIS and POSTGIS

i use PostGIS and H2GIS and i have tested ST_Transform function on both systems: SELECT ST_AsText( ST_Transform( ST_GeomFromText('POINT('||to_char(5873455.6,'9999999.99')||' ...
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29 views

Rectangle Appears Distorted on Map

When displaying two features, a polygon a (see geoJSON) and its minimum bounding rectangle b (see geoJSON), I get the following result when viewing on geojson.io: The minimum bounding rectangle ...
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Split a table of Multi/Linestrings into Unique Linestrings

Is there an efficient way to split a table of Multi/Linestrings that overlap() and touch() into unique Linestrings (note: creating edges using topology is going very...very...very slow). Here is ...
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Converting NAD 83 to WGS 84 in PostGIS

My question is about the best way to convert from NAD 83 to WGS 84 in PostGIS. I have a PostGIS DB containing National Elevation Data rasters. The rasters are in NAD 83 and I would like to convert ...
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PostGIS: Perform a Spatial Join only joining the intersecting polygon with the maximum value

I'd like to perform a spatial join using PostGIS. I've got table_A containing 80.000 entries and table_B containing roughly 1.500.000 entries. The entries in table_B have a column "number". My goal ...
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How to render visualizations for geospatial objects (the way QGIS does it) on web interface for end users, from PostGIS database? [duplicate]

I have existing geospatial objects in PostGIS. I can visualize it using QGIS. But I want to render these visualization on a web-interface for my users as a result of some queries in the database. I ...
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Draw line with lon, lat, distance and azimuth

I have table in PostGIS with lon, lat, distance and azimuth columns. I want to make Geoserver draw a line through first point with given length and direction. I can turn lon and lat to geometry in ...
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2answers
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geometry from relations - osm

Can someone show me the relevant documentation for relationships between tables? I'm trying to get the geometry for an entry from the relations table but I'm unable to pick out the right information ...
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Moving file flat-nodes.bin from an osm2pgsql import

I'm running PostgreSQL 9.4 and osm2pgsql 0.82.0 on Ubunt 14.04 (64bit). I'm new-ish to postgres and less new to OSM. My goal was to import the planet file. Unfortunately, when I started the import, ...
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How to relate a Spatial and Non Spatial table in PostGIS to be visualized in QGIS

first of all I'm quiet new in PostGIS. I'm working in pgadminIII with postGIS. I have in one database two tables. See the two tables SQL Pane. CREATE TABLE gw_body_characterisation2 ( ...
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31 views

Add columns with information OSM by osm2po?

I imported the europa.osm network within my spatial database thanks to the osm2po tool. I use this with pgrouting. My problem is that I need to know the information provided by the tag address (city, ...
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Rotate Polygon to be Parallel with the X Axis

By default, PostGIS calculates the Envelope or Extent of a polygon based on the bounding box of the polygon ((MINX, MINY), (MINX, MAXY), (MAXX, MAXY), (MAXX, MINY), (MINX, MINY)). This gives a result ...
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Poor performance with storing large rasters in PostGIS and visualising in QGIS

my question concerns the use and performance of several software tools in conjunction, namely PostgreSQL, PostGIS, QGIS, and GDAL. I'm a long-time ArcGIS, Python, and R user who is interested in ...
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Any experience or tips for using qgis with postgis layers? [duplicate]

we want to replace our shapefiles with postgis layers for editing in QGIS. We plan to edit 1 Layer with 5 people at the same time is this possible? Is this a good idea or is there a better practice ...
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25 views

Postgis spatial query st_disjoint

I have 2 layers that I want to compare. I wish to retrieve the features in the layer 1 that have no part in common with the features in the layer 2. I try queries like that but do not returns me the ...
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How to convert a geojson from Postgresql to geojson format readable in rCharts in R?

I am creating a Rshiny interface on that can take in user input and SELECT the respectively map layer from Postgresql database based on the input. The package I am using to plot the map is rCharts. ...
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How to open a file generated using Postgresql 9.3 and PostGIS 2.1

For more background to this question see Building customized data set from American Community Survey data? I downloaded a file from http://www.justicemap.org/data.php under the section PostgreSQL ...
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Finding Census Tracts Within a Circle in PostGIS [duplicate]

I suspect this is a basic question but, for a newb like me, it's proving to be quite a challenge. I have imported (using ogr2ogr) a collection of census tracts from the U.S. Census-provided .shp files ...
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In PostGIS, is it possible to use `ST_SnapToGrid` align to a coordinate system?

I am wondering if it is possible to align a raster or geometry by specifying the coordinate system using the spatial reference identifier, i.e. 4326 for WGS 84. I did not see anything in the ...
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PGR_Djikstra function error

I'm trying to find a shortest path between 2 nodes using djikstra method but it keeps saying ERROR: Error, query must return columns 'id', 'source', 'target' and 'cost' this is my query: ...
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27 views

Align pixels from two rasters with different cell sizes

I have two rasters in a PostGIS database that I want to be able to compare. The first raster is at 5m pixel resolution and the second raster is at 30m pixel resolution and is on a different grid. How ...
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How to remove lines made with a PostGIS query automatically if origin is not in the map window?

I have a PostGIS point layer with labels. I moved these points because they were too close. To connect label and point, I created a line vector layer which was made with a query in the DB-Manager ...
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Install PostGIS without Internet Connection [migrated]

Hi I have binaries but am working on a machine that is on a network not connected to the internet, and I need to install and run PostGIS without Stack Builder or an internet connection. I've tried ...
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Creating quadtree index on latitude, longitude data in PostGIS

I have a table of locations in which one of the columns represents the lat-long for the location. These coordinates have been extracted from the OpenStreetMap file. How can I create a quadtree index ...
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Windshaft + Postgres to read geojson

I am using Windshaft and trying to figure out how I can take a geojson text object from Postgres and have it rendered as a tile layer. I have tried the following query: sql: "select ...
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Up-dating postgis spatial table from CSV files

I have a PostGIS Table I produced from importing a layer file itself created from a CSV. I am getting updates to the main file through other CSV files and need a method of importing the new CSV's into ...
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Hardware Requirements ? Overpowered?

I'm running a i3 3,1 GHz Machine, 4 GB of RAM with an onboard Graphic Chip. I build a small GIS with Mapbender3, Geoserver based on PostGIS data. It's running pretty fluid from what i can see. Now i ...
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Web Application for display raster data on basis of time slider

It May act as a duplicate question to many, but i have tried refering too all the questions related to my questions, but i am still confiused. Below in attached my code. which i use for Web Mapping ...
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What can I use to generate an interconnected graph from a series of coordinates?

I have a table containing latitude and longitude coordinates, and I'd like to be able to build an interconnected graph from it to use with pgRouting. Is there an existing feature of postGIS or ...
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45 views

Import point cloud into PostgreSQL/ pdal pipeline fails

I have a point cloud dataset that I would like to upload to my postgres/postgis database. I followed this tutorial and I could install everything without problems (on ubuntu 14.04. On ubuntu 12.04 ...