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

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Export qgis vector layer to PostGIS table using python

I've created script, which does bunch of stuff, and in the end, I would like to export it to postGIS table. What is easiest way to do such export using qgis api or sth. I dont want to write SQL ...
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87 views

R PostGIS convert SpatialPolygon to PostGIS table

I've been having some success in scraping some webdata and converting it from HTML to spatial data as originally asked here: Parse PHP/HTML to shapefile or similar I've been using R to both fetch the ...
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48 views

Dot density inside polygon (kml co-ordinates)

I have a kmz url(its not in local), which has so many polygons in it. Which contains co-ordinates something like: <LinearRing> <coordinates>138.878021,-34.971903,0.0 ...
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38 views

GDAL_Translate not compressing when NoData value is set

I am trying to compress a .TIF file using GDAL_Translate or GDAL_Warp. My Raster is 32mb to start with. When I use GDAL_Translate with the COMPRESS=PACKBITS option, it compresses to 1.9mb. However ...
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27 views

openlayer wfs protocall reset on map zoom

By considering wfs-example example. I have added one layer on map with BBOX and savestrtegy and add controls(add,delete,modify and save). wfs = new OpenLayers.Layer.Vector("Editable Features", { ...
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87 views

uploading raster format tif to postgis through raster2pgsql

I have the same problem Uploading raster format(*.tif) to postgis through raster2pgsql How to you fix it, if it is a problem? Because my raster column is empty. Of if it's ok, what does it mean? ...
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47 views

Problem with Performance when accessing selected Features from PostGIS layers in QGIS using Python

I have 2 PostGIS layer in my QGIS project. They have about the same amount of data and a similar structure except that layerX has its PK on a single column and layerY has its PK on 4 columns. When I ...
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84 views

imposm2 to imposm3

I am using imposm2 to import osm data to postgresql database but recently moved to imposm3 which is still in development phase I want to know is there an easy way to convert imposm2 mapping file ...
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52 views

Bulk insert geometry in PostGIS inserting geom from an already existing table in database

My goal is to bulk insert original data into a table I created within PostGIS. I want to insert geographical data into this same table as well; this geographical data already exists within my ...
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24 views

PostGIS commands in GRASS

How does the geometry get referenced in GRASS when using a PostGIS command like st_within? e.g: echo "UPDATE file SET within=(select file2.name from file, file2 where st_within(file.geom,file2.geom) ...
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54 views

insert row into postgis query table in QGIS

I find I am using QGIS (2.4) more and more as a client for PostGIS database tables with geometry, but also for tables without geometry, partly because it's good just to use the one application and ...
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14 views

Working with different source WMS data

I have a geoserver and WMS services on it. For example my water valve layer is point data and published from geoserver. (I am using postgis to saving data.) An external WMS service publishes polygon ...
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131 views

C# geometry hex decoder

When i am storing in the database things like: Point(90 90). I get back 010100000000000000008056400000000000805640 which is a hex encoding of the geometric type. Does anyone know a library for c# ...
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133 views

Postgresql Postgis Query is taking long time

I have a table that included only 472 rows and geometry of table is Multipolygon. I am sending query to databse via PgAdmin III select * from mytable // this query takes 99413 ms this is vey long ...
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86 views

PostGIS Spatial query taking a very long time

I'm trying to return a count of crimes (points) that occur in each police grid (polygons), as well as the geometry data, but the query takes ~22 seconds. This seems oddly high and will be problematic ...
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64 views

Problem in importing .osm file with osm2pgrouting 2.0

i've got two different systems: First system is: Ubuntu linux 64bit Postgres 8.4.8 Postgis 1.5.1 pgrouting 1.05 osm2pgrouting 0.2.0 This the system i've used for an old project that is already ...
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26 views

Text in POSTGIS Raster

Is it possible to add text/annotation to a raster generated in Postgis raster? Specifically I need to do this within the database if possible and am looking for an option that does not require an ...
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109 views

Calculating driving distance from many nodes (sources) to one target using PgRouting?

I'm using a PostGIS / pgRouting database setup with a road network. And I want to calculate a driving distance and shortest path from many sources to one target. I found that pgr_kDijkstra can ...
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81 views

How to create a vector layer from a GeoAlchemy2 query?

I'm currently developing a QGIS plugin where I mapped a PostGIS database via GeoAlchemy2. I wrote a function that returns results from a GeoAlchemy query but have no idea how to create a vector ...
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18 views

Why is there greyed dupplicated table in Add PostGIS Layers dialog in QGIS 2.X

Does somebody knows why PostGIS 2.X tables are duplicated and greyed in the "Add PostGIS Layers" dialog in QGIS 2.X.? One is coloured with geometry type recognised the other is greyed with unknown ...
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21 views

shp2pgql: how to omit the git column?

I am importing a series of shapefiles with shp2pqsql that already have a unique identifier attribute. Since shp2pqsql creates a new column called gid I am ending up with two unique identifiers per ...
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154 views

Function ST_Transform postgis 2.0

I've read many forum posts on the function ST_Transform but unfortunately was unable to resolve my doubts so I posted a new question. I have a spatial table SRID = 101010 and want to transform it to ...
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34 views

How to dynamically slice polygons

My survey software doesn't supports big polygons (with more than 8000 points) and I'm trying to slice those polygons with local dynamic grids. I wrote a function but it's only returning one sliced ...
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88 views

mapserver postgis

I have a problem with my connection to my db. I get this message: msPostGISLayerOpen(): Query error. Database connection failed (fe_sendauth: no password supplied ) with connect string ...
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218 views

Problem inserting feature into GeoServer empty layer via WFS-T

I'm facing a strange issue with GeoServer (2.4) (on PostgreSQL 9.4/PostGIS 2.1). The problem is I am not able to insert a feature via WFS-T if the layer is empty; it returns me the following error: ...
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47 views

rasterize table polygon postgis 2.1

I would like to rasterize a postgis 2.1 polygon table, but I don't undersand how to create the SQL function syntax for ST_AsRaster. My vector table has 3 fields: gid, recharge, and geom. The SQL ...
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719 views

Postgres SSL SYSCALL error: EOF detected with python and psycopg

Using psycopg2 package with python 2.7 I keep getting the titled error: psycopg2.DatabaseError: SSL SYSCALL error: EOF detected It only occurs when I add a WHERE column LIKE ''%X%'' clause to my ...
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65 views

PostGIS Function both work fine

I create two function both work fine same solve, but one of them, take to much time (which one use "temporaly"). Is very important because I will run in several times the funcion. Please any one can ...
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56 views

Sort Proximity Results Into Groups Based on Distance from Center

The scenario is as follows: I have a database of pizza places with review averages. I want users to be able to find pizza places near a location and have them sorted by distance. Pretty straight ...
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53 views

Postgresql (soln would be basic SQL I think): ORDER by distance to a point and return those distances in array pairs w/ the full records

so I know there have been some questions asked about how to calculate distance using postgis and how to order results by their distance from a respective point. I'm not very talented at SQL (at all) ...
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373 views

Error adding Geoserver store from PostGIS

I cant get a connection up when creating a PostGIS-store. Geoserver is running fine on IP:80/geoserver. PostGIS is running and working fine with psql commands Created database/table 'mydb' and ...
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94 views

OpenStreetMap Road and Polygon Data as 1x1 Degree Shapefiles

I am working on a global project for which I want to use OSM data as a model input. I am looking for advice on the best way to produce 1x1 degree WGS84 shapefiles from either regional extracts or the ...
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38 views

Credential Dialog, disabling default Realm information messages disclosing password

I'm using the QgsCredentialDialog for determining user access to the database. When a user is failing to log in correctly the log in credentials are shown in the dialog (Fig. 1). (success, uname, ...
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52 views

How to get create new object right in postgresql

I created a .shp in QGIS successfully and now i want to move on this to postgis db, following this command shp2pgsql -s 2964 roads.shp lakes_new | psql qgis_db but i got this error how to solve ...
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441 views

PostGIS 2.1 error install with shared object (rtpostgis-2.1.so") Linux Mint

I've Installed Linux Mint 16 mate and install PostGIS with PostGreSQL (I've tried many ways in the Internet from original source to some suggestion) but all is too error: " ERROR: could not load ...
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120 views

Adding GIS feature into an existing postgis table using django 1.6

i am using Django 1.6 on my web map. the problem i got is that i cannot import shapefile with features about 200. . the console has given me this traceback. . Saved: 162-05-0001-005-31 Saved: ...
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362 views

ECW files to geoserver 2.4

I'm trying to add .ecw files (20 orthophotos) to geoserver 2.4. Geoserver is running on an ubuntu 12.4. Vserver. I'v already installed the GDAL plugin. Is this the right format for the ...
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45 views

Speed drastically reduced when including geometry, is there a way to improve?

-- EDIT: Issue is that the shape files being used are at too small of a precision and way too large, output was 488M total, looking for different source -- I'm having some speed issues with a complex ...
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106 views

Add memory layer to a preexisting PostGIS table

I'm trying to append a memory layer to a preexisting PostGIS table. The DB connection is already established (in this way: How to properly establish a PostgreSQL connection using QgsCredentials) and, ...
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110 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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71 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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482 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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674 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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145 views

Postgis extension is not detected although it's installed

I have a database with postgis extension installed. i can verify it by running \x then \dx. The postgis and postgis_topology is available. But, if i run SELECT PostGIS_Version();, it says ERROR: ...
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78 views

Why CQL DWITHIN returns different result than PostGIS DWITHIN?

I have 2 tables in PostGIS that I publish to geoserver. both have same SRS (2039). When I do the following query in PostGIS , I get 69 results : SELECT a.gid,b.gid FROM Table_A a INNER JOIN ...
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214 views

Mapscript. Converting pixel coordinate to latitude longitude for postgis

I have a map created with mapscript. It is a 2D (PNG format) that's being shown on a web browser. I want to get the lat/long coordinates whenever the user click on the image, and then save it in my ...
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29 views

Linking Google Sheets with PostGIS

I am curious if there is a way to link a PostGIS table with a Google Sheets? Both tables (Post and Google) have a unique ID that can be used as a linkage. I am hoping to be able to build a view that ...
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398 views

postgresql 8.4 and postgis 1.5 error: type modifier is not allowed for type 'geometry'

I would like to generate a buffer (within a limit of 3km ) where the user clicked point. In pgAdmin, select my database and open a query editor and create 2 PostGIS functions (UTM Zone Function and ...
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159 views

Using Terraformer to convert to WKT

I'm using Terraformer to parse some ArcGIS JSON into a Terraformer primitive. I'd like to store the geometry in PostGIS for other purposes. So I'm trying to use the WKT.convert tool to convert this ...
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145 views

issue with QGIS Scale Level

I have different layers of shape files. I have imported all shape files into PostGIS. Now i want to show 3 layers Country, State & District with different scale/zoom level I tried to set scale ...