PostgreSQL is an open source object-relational database system.

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16 views

Geoserver getfeatureinfo returns big number with exponential format

I have a Geoserver layer, which contains numbers on a million scale in one of the attributes. If I query these features, I get back a number in this format: 4.1E7 instead of this: 410000000 Is there ...
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1answer
183 views

How to check overlap between two sets of Linestrings using postgis

I have 2 sets of LINESTRINGS, each set containing around 50 LINESTRINGS(which form a road), how do I check whether these two sets overlap or not ? Thanks in advance.
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23 views

Applying values to highest terminal segments in channel network using PostgreSQL?

I extracted a channel network from a dem but due to some technical difficulties the layer had some discontinuities. So after filling them, i suddenly realised that the Strahler orders it gave me were ...
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1answer
652 views

PG::UndefinedFunction: ERROR: operator does not exist: point = unknown

Recently, I developed a feature to save and fetch points(lat and lon) from DB. It is working fine on my local, but on production database it is giving error: PG::UndefinedFunction: ERROR: operator ...
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0answers
26 views

Python GDAL open dataset in PostGIS with quotations

Error trying to use gdal to open a dataset in PostGIS with the following code: ds = gdal.Open("PG: dbname=nyc host=localhost user=postgres password=mypassword port=5432 mode=2 schema=public ...
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0answers
19 views

PostGIS Svg Projection on Google Map

Context I have a database with spatial data such as areas and points. Some of the areas in my db are coming from OpenStreetMaps, representing some regions. (Which are kinda small at earth's scale, ...
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3answers
2k views

I have not found shp2pgsql in postgis installation

I have been installed postgis following this guide. All is OK. SELECT postgis_full_version(); "POSTGIS="2.1.7 r13414" GEOS="3.4.2-CAPI-1.8.2 r3921" PROJ="Rel. 4.8.0, 6 March 2012" GDAL="GDAL 1.10.1, ...
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1answer
32 views

Find the convex hull around a set of polygons?

I'm using Postgres 9.4 with PostGIS 2.1. I have a table with the following columns: Column | Type --------------+------------------------ ogc_fid | integer ...
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1answer
1k views

How do I explode a MultiLineString using ST_Dump() in PostGIS?

I want to do what this blog post does: explode a MultiLineString into individual LineStrings. I'm using CartoDB but don't get individual LineStrings as the result of my query. I still get a ...
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1answer
93 views

OSM data import error on Windows 2012 server using osm2pgsql

I am trying to use OSM data using mapserver (ms4w) on windows. Set up all tools and downloaded data for this purpose. http://download.geofabrik.de/north-america/us/georgia-latest.osm.bz2 Extracted ...
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1answer
44 views

ogr2ogr: encoding issues when importing from Oracle Spatial to PostGIS

I'm trying to import some spatial tables from Oracle Spatial to PostGIS using ogr2ogr, but I can't figure out why the special characters on the attribute tables get messed up while I'm doing it. My ...
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1answer
3k views

How to write a point-in-polygon query for Postgis?

I'm trying to write a query in Postgis which will return all rows where a dynamically changing longitude/latitude point resides within the geometric polygon of that row (in the geom column). This is ...
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1answer
187 views

PostGIS is not seeing any GDAL drivers

I've tried setting POSTGIS_GDAL_ENABLED_DRIVERS=ENABLE_ALL as an environment variable. As well as running SET postgis.gdal_enabled_drivers = 'ENABLE_ALL'; from psql. -- (With a pg_ctl restart after ...
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1answer
49 views

how to highlight the points within a buffer radius

i have created 1km radius buffer within that buffer few school points will come.how to highlight those points and how to retrieve that school data from database am using postgresql for db connection.
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1answer
61 views

Big datasets in QGIS

I'm working with large PostGIS tables in QGIS but really only need to do simple visualization and editing the attributes (like change road names, speed limits, etc). The most processing I need to do ...
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1answer
23 views

Not able to create postgres Sql file using Osm2po

I am newbie to the GIS community. After downloading the osm2po jar file, I have run following the instructions from underdark tutorial. Also, from Carsten's answer in gis stack exchange, I have ...
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0answers
17 views

Converting .shp to wkb after v.clean

I've been trying to get to through this by reading manuals, but I can't seem to understand what I'm doing. I have source data with overlaps that exist in a table with associated WKBs(SRID 4326). I ...
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2answers
39 views

How to save several Layers in QGIS as shapfile in one step

I have a huge QGIS (using 2.12.3-Lyon) project with several layers stored in a SQL database. Now I need this layers as Esri shapefiles. It is possible to right click one of the layers, click on "Save ...
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1answer
60 views

How to use ST_ClusterWithin with geography data type and measurement units?

I want to clustering locations use ST_ClusterWithin function: geometry[] ST_ClusterWithin(geometry set g, float8 distance); My table has column location of geography(Point,4326) type and I don't ...
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0answers
101 views

Adding data from PostgreSQL to Query Layer of ArcGIS for Desktop warns that given coordinate references are incompatible?

When adding data from PostgreSQL in a Query Layer I get the warning: The given coordinate references are incompatible I have added many other layers with the same properties no problems, but I ...
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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
28 views

Issues with raster data on postgresql / error:Attempting to get pixel value with out of range raster coordinates

So here is the issue, i am trying to extract values from a big raster divided in 200 or so tiles and applying them to a selection. The points are startpoints, endpoints and midpoints from vector ...
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1answer
25 views

postgis not valid win 32 application

I'm trying to setup Postgres 9.5 on my local machine x64 based win 8. I've downloaded postgresql-9.5.1-1-windows.exe and also downloaded postgis-bundle-pg95x64-setup-2.2.2-1.exe Postgres runs fine, ...
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0answers
43 views

Interpolating point to nearest polygons to compute street width in posgis

I am trying to calculate the width of streets (line.shp) in postgis using reference point (ref_point.shp) (yellow point features) and building polygons (building.shp). The red point features are the ...
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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
516 views

TinyOWS failing to connect to postgresql - Ident authentication failed for user “postgres”

I'm getting the above error on a new and local TinyOWS installation on Centos 6. Postgresql 9.2, PostGIS 2.0. I can connect to PostGreSQL locally and from my LAN using several other methods (psql, ...
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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
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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3answers
1k views

Configuring SFCGAL to PostGIS Db

I was using PostgreSQL with PostGIS and Pgrouting. Recently I needed to install SFCGAL for some extra functions for my PostGIS db. After installing SFCGAL, now I don't know how to update my PostGIS db ...
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2answers
4k views

Implementing Spatial Autocorrelation using QGIS or PostgreSQL or any other 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
30 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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41 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
194 views

What is the difference between ST_GEOMETRY and WKT?

What is the difference between ST_GEOMETRY and WKT? Is ST_GEOMETRY just a database type and WKT (well-known text) is a textual representation of the data?
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1answer
198 views

plypython set-up

I am trying to set up plypython on the following system: Windows 8.1 PostgreSQL 9.2 64-bit PostGIS 2.0 Python 2.7.05 I have added plpython2.dll to \PostgreSQL\9.2\lib When I run: CREATE ...
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2answers
510 views

How to enable SFCGAL in PostGIS?

I have the problem with the enabling extension SFCGAL. CREATE EXTENSION postgis_sfcgal; doesn't work for me even I have the PostGIS v2.2. When I do that, it throws an error ERROR: could not ...
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1answer
24 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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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
223 views

Error installing PGRouting database extensions

Im trying to install pgRouting and I cannot reach the end of the way because of the following error: psql:/home/user/share/postgresql/contrib/pgrouting-2.0/pgrouting.sql:2459: ERROR: could not load ...
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0answers
60 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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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
48 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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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
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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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 ...
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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 ...
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1answer
181 views

GROUP BY on geography in postgres 9.4.0 returns wrong/different results

table definition: CREATE TABLE search ( id bigserial NOT NULL, location geography(Point,4326) NOT NULL, location_aggregated geography(Point,4326) NOT NULL, created timestamp with time zone ...
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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 ...
1
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1answer
39 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 ...
1
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1answer
50 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 ...