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

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How can I draw the results of a PostGIS query?

Reading the solution to PostGIS > Intersect two circles. Each Circle must be built from Long/Lat degrees plus radius got me thinking. How can I graphically display a SQL query? It doesn't need to ...
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1answer
96 views

transform MULTILINESTRINGs to curves in cartodb

I have a table with a column that contains MULTILINESTRINGs, where every string contains the longitude and latitude of a starting- and an end point, e.g.: MULTILINESTRING((97.0253024 ...
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306 views

Converting from kilometers to degrees distances?

We have geometries in a Postgis database with SRID WGS84 and we have found lookups directly in degrees to be much faster than in kilometres, because the database can skip the projections I would ...
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3answers
141 views

Appending data in PostGIS database with QGIS?

I 'm running postgis with qgis 2.6. I created a database and tables that i need to update with new datas provided with shapes. I cannot find how to insert them in table. All attributes both shapes and ...
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213 views

How to complete the roads output of PostGIS?

I converted the file I exported from OSM to PostGIS using osm2pgsql. I have opened the table's outputs to QGIS and I saw data are not complete compare to OSM editor view. Most of the roads are broken ...
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900 views

Searching planet_osm_point by longitude and latitude

I used osm2pgsql to import data into my PostgreSQL database and it put gave me the following 4 tables, planet_osm_point, planet_osm_line, planet_osm_polygon and planet_osm_roads. I have looked at ...
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861 views

GeoServer WPS Aggregation Functions Example

The scenario: I want to present a user with names of polygons from a layer in GeoServer. I then display the polygon(s) whose name(s) the user selected. What I've done: I have a search box, which ...
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50 views

Where to download .osm files and how to convert it to .xml? [closed]

I am new to deal with OSM data, and I want to download only .osm files not .pbf. I tried geofabrik.com but it provides .osm.pbf file format where can I download .osm files? is there any recommended ...
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1answer
131 views

PostGIS Best Practices with thousands of entries

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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102 views

How to implement a radius search using PostGIS

I am very new to this topic and after a long time of research I didn't find a solution. I want a query that I can use on my PostGIS database performing a radiussearch.. I inserted the Open Street Map ...
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2answers
560 views

Drawing curved lines in CartoDB?

I am experimenting drawing curved line from Origin to Destination in Cartodb. I was able to do so once, however, failed the second and third time. Could anyone offer me some insights into the ...
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1answer
182 views

PostGIS: ST_Clip() raster in SRID:32617 with a polygon

I'm trying to ST_Clip() raster in `SRID:32617' with a polygon. What I did ST_Transform(polygon, 32617): It fails, couldn't project point() exceeded limit (-14) ST_Transform(rast, 4326, ...
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1answer
515 views

Coordinate values are out of range [-180 -90, 180 90] for GEOGRAPHY type

After import some data from OSM file into Postgre, the coordinates numbers are too big and having trouble to cast to Geography: Coordinate values are out of range [-180 -90, 180 90] for GEOGRAPHY ...
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0answers
104 views

not able to view imported .tif file in geoserver

I am using geoserver. I have imported a .tif file using postgis, which has been saved in vector type layer in geoserver. Now, whenever, I preview it, the layer gets automatically downloaded as wms ...
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1answer
8k views

Geocode quality: Nominatim vs. PostGIS Geocoder vs. Geocoder::US 2.0

I occasionally need to geocode >> 500,000 US street addresses (no features or intersections). I'd like to set up a geocoding service locally to handle these bulk geocodes. I've used the Tiger-based ...
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5answers
11k views

Optimizing osm2pgsql imports for OSM data

I'm currently building an instance on EC2 on which to import the entire Planet.osm snapshot of the whole Earth's worth of data for some projects we're working on. I've spun up a large Ubuntu x64 ...
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2answers
6k views

How can I find a point inside a polygon in PostGIS?

How can I find a point that is guaranteed to be within a given polygon in PostGIS? I am aware of the ST_Centroid function. However, the centroid is not always within a polygon, see below: ...
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1answer
3k views

Comparison of geocoding solutions (such as Gisgraphy & PostGIS 2.0) [closed]

As I am sure many of you are aware, PostGIS has finally released Version 2.0 and included within this version they have also built a geocoder (see: http://postgis.net/docs/Extras.html). Although I ...
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6answers
3k views

How do I get started with GIS Servers on Amazon EC2?

Are there any tutorials, talks or presentations that discuss the use of EC2 or other cloud computing services to host GIS Servers? Has anyone had any experience in doing it with Amazon's EC2? How hard ...
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5answers
16k views

How to create PostGIS template?

I am following a tutorial to install pgrouting. However, I didn't get the part when it says Start pgAdmin and create a new database based on your PostGIS template Where can I get this postgis ...
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2answers
7k views

Spatially enabled Postgres database

I am trying to create a spatially enabled PostGIS database. I am following the PostGIS documentation, http://postgis.net/docs/manual-1.5/ch02.html#id2648455. In the short version, i executed, ...
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2answers
3k views

What is the most common way of displaying geodata from Postgis on Leaflet?

For example, in my database I've some points with geographic coordinates. I want to display them on Leaflet JS layer. Which instruments should I use? Maybe there is some API...
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2k views

What is the best web editor and server for postgis?

I'm looking for a web editor (similar to openstreetmap) that works with an map Server (postGIS). This should permit edit and create new structures on map. What is the best option? Can you help me? ...
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4k views

How to implement Spatial Autocorrelation using QGIS or PostgreSQL (or any free application)?

I am a total newbie on the GIS scene so I hope this is not a stupid question. I have two layers in a PostgreSQL database. The first layer contains points where events happened in Europe. The second ...
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1answer
2k views

Identifying topological relationships using PostGIS

I'm trying to perform a basic typology analysis using PostGIS. My objective is to find any polygons that touch other polygons. To do this, I thought the ST_GetFaceEdges would work (reference). I want ...
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658 views

Nearest Neighbor Grouped Selection in QGIS

OK - so I have an interesting problem I am trying to solve. I have a list containing over 100,000 points in lat/long format which I have imported into qgis. Now, what I am trying to do here is group ...
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3answers
4k views

Editing PostGIS/GeoServer data via web?

I've got PostGIS installed and would like to create a web application to do some simple edits: Draw manually (over a Basemap) points, lines and polylines, using snapping points (points, end of ...
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2answers
2k views

Moving a PostGIS Installation

I have a simple question: I have a postGIS installation running on an old computer that I'd like to move. I spent a bunch of time playing with pg_dump and pg_dumpall without success. It seems the ...
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757 views

PgRouting - How to clip links when reaching max costs?

I have a polyline shapefile representing a road network and a second shapefile containing points. I would like to use PostGIS (presumably PgRouting) to identify sub-networks or service areas radiating ...
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2answers
5k views

What is the best way to do reverse geocoding with PostGIS?

Is there a way to do reverse geocoding with PostGIS? There's a lot of information on the Web but I found it very confusing... I have imported osm data into my own Postgres with PostGIS database. Now ...
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446 views

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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Version editing for Postgresql 9.2.4 / postGIS 2

Background: I am "building" a GIS with PostgreSQL 9.2.4 / PostGIS 2 as the database and QGIS 1.8.0 as the geographic application. There will be multiple users accessing, editing and viewing the data ...
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Install PostGIS and TIGER Data in Ubuntu 12.04

Could someone write a brief albeit dumbed down idiot's guide to installing postgis and loading national Tiger data on ubuntu? I've tried a few guides, namely, ...
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2answers
2k views

Automating batch load of multiple GPX files into PostGIS

I've got 50+ GPX files that I would like to "batch load" into a PostGIS database. All of the track_points data would be loaded into a "track_points" table (with typical GPS fields like lat, long, ...
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3answers
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Is there a CASE Tool for modelling spatial databases?

Does anyone knows if there is a CASE Tool that would be possible for modelling spatial tables? I need to create a model and export it to SQL or a database directly. I´m using PostGIS. Thanks in ...
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3answers
1k views

Visualization of 3D shapefiles with Mapserver and Postgis

I'm wondering is there a way to visualize 3d data with mapserver? 3D .shp files are in postgis database, and I already connected mapserver to database, but with simple layer in mapfile.
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2answers
596 views

How to identify and simplify point clusters with regard to time in PostGIS?

I just started to work with spatial databases and I want to write a SQL(PostGIS) query for automatic generalizing of raw GPS-tracks (with fixed tracking frequency). The first thing I am wokring on is ...
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6answers
3k views

Should I use a CMS for my web mapping application?

For my web mapping app, I am using GeoServer as server, PostGIS as spatial DB and OpenLayers on client side (as well as other JS libraries). The map is composed of base maps and vector layers. One of ...
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2answers
651 views

PostGIS Intermittent INDEX Performance

I have a table containing approximately 55 million data points ( point is a geometry with SRID 4326 ) and for my query I need to join this to an area table ( currently have ~1800 areas ) which ...
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4answers
4k views

ST_Intersection slow query

I am trying to perform an intersection between two layers: Polyline layer representing some roads (~5500 rows) Polygon layer representing irregularly shaped buffers around various points of interest ...
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3answers
9k views

How to create a new 'gis' database in PostGIS?

I'd like to create a new database in PostGIS, so I can load stuff into it while the current database is being used. According to the docs Some packaged distributions of PostGIS (in particular the ...
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4answers
1k views

How to merge close points into polygon?

I have a set of coordinates (points & no overlaps) in a single table,each containing attribute number fields,like in the following image. I want to merge these points into smallest polygons by ...
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1answer
2k views

How to find the nearest point projected on the road network?

I would like to know if there is a function at pgRouting that given a point (lon/lat) can give you the projection of that point to the road network . Thanks in advance john
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2answers
992 views

Total great circle distance along a path of points (PostGIS)

I am looking for an SQL query that sums the distances between a series of points using PostGIS. The situation is as follows: I have 2 tables: tracks and points. Points belong to a track and thus ...
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2answers
4k views

What are hardware requirements for a cloud hosted PostGIS & GeoServer?

I have been playing with a local installation of PostGIS & GeoServer. I would like to move my work online now to share it with several collaborators. The proof of the concept map will consist of ...
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5answers
8k views

How best to fix a non-noded intersection problem in PostGIS?

I'm using a PL/R function and PostGIS to generate voronoi polygons around a set of points. The function that I am using is defined here. When I use this function on a particular dataset I get the ...
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803 views

PostGIS interpolation / triangulation options

I'm looking for an open source workflow to automate DEM construction. We have a series of sites that fall within a LIDAR dataset. We want to create site specific DEM's for each site, and we're ...
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2answers
4k views

How to import esri Personal Geodatabase (.mdb) to PostGIS on Linux

We have esri Personal Geodatabases that we need to import into PostGIS. Ultimately, we'd like to allow people to upload an MDB on a web server, and have it import the layers into PostGIS. On ...
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Are there Desktop GIS alternatives to ArcGIS 10.X for topology and vector conflation?

Is there any options other than ArcGIS for Desktop for topological rules and automatic topology integrity enforcing in a Desktop GIS? I am looking for something that will automatically snap features ...
9
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3answers
1k views

How to populate an undirected graph from PostGIS?

This question is more related to resources that I might not have identified yet, although I've been searching the web for a while. In the project I'm working at the moment I need to run a ...