Version 2.0 of PostGIS brought a heavy set of new extensions for the PostgreSQL object-relational database, adding greater support for spatial objects.
1
vote
1answer
40 views
How do I convert MultiLines to MultiPolygons using Postgis
In postgis I'm using the following query to buffer lines to polygons:
UPDATE rivers
SET poly = ST_Multi(ST_Buffer(lines, 0.01))
where id = 1;
The column 'lines' is a MultiLine and the column ...
1
vote
0answers
26 views
Joining layers with respective elements with PostGIS Topology
Recently I have started using PostGIS topology extension, but I have some difficulties in understanding how the structure works:
One of the key points is the use of "layer"s: as of what I understand, ...
2
votes
1answer
35 views
How to connect Postgis database with/in Remote Servers…?
I am preparing a 'Web based map' application using 'Geoserver-Openlayers-Postgis'...
Now,
I am trying to connect my Postgis database(located at 10.50.110.11 location) with the following command from ...
1
vote
0answers
18 views
error in loading raster tiles on postgreSQL
I am trying to import raster data from PostGIS to GeoServer.
I follow the instructions given on this link.
...
0
votes
0answers
15 views
Get Complete Details Of Raster Column in the Raster Table
i'm having the geotiff files containing the details of the temperature of the specific co-ordinate value along with it.
Configuration details:
Postgresql 9.2,
Postgis 2.0,
GDAL 1.9.2.
Here my ...
3
votes
3answers
48 views
Snapping start- and end nodes of lines to other lines in PostGIS
There are plenty examples that show how to snap lines to points, but I haven't been able to find any (fast!) way of snapping the start- and end nodes of line strings to nodes of other lines.
...
0
votes
2answers
65 views
Emergency Services: How to optimize routing by measured travel time?
I would like to optimize the service areas / catchment areas for an emergency service. Therefore, I have several measurement points on the streetmap, where people have stopped the travel time from ...
3
votes
0answers
54 views
How to install PostGis on EC2 micro-instance
I tried to install PostGIS on my Amazon EC2 microinstance using sudo yum install postgis2 and got following error message:
$ sudo yum install postgis2
Loaded plugins: ...
2
votes
1answer
59 views
Calculating points in the USDA's Cropland Data Layer coordinate system
I need to integrate against the USDA's cropland data layer. They've got a demo and some API docs.
The important query I need to run is this, given an (x, y) of say (1551459.363, 1909201.537):
...
1
vote
1answer
41 views
Getting a “java.lang.OutOfMemoryError” error while importing raster files from PostGIS to Geoserver
I am trying to import raster data from PostGIS to GeoServer.
I follow the instructions given on this link.
...
1
vote
0answers
35 views
operator does not exist: geometry <#> geometry
I'm running PostGIS 2.0 for PostGreSQL 9.2, and I have a customer who wants to know how close a provided geometry is to the nearest feature in a table. So I'm playing around with the "<->" and ...
2
votes
1answer
28 views
Are there strategies for dealing with TopologyException errors in PostGIS 2?
Are there strategies for dealing with TopologyException errors in PostGIS 2? Nearly every function I run against two geometries results in a TopologyException (e.g. ST_Intersection, ST_SymDifference).
...
0
votes
1answer
40 views
Postgis 2: Polygon/MultiPolygon in a single column
Storing MultiPolygon and Polygon features in a single column used to be as simple as not creating or removing the geometry type check constraint.
Is there a similar simple fix in PostGIS 2?
0
votes
1answer
22 views
ImageMosaic-JDBC Error
I'm trying to get postgis raster layers in geoserver-2.3.1, with postgresql-8.4, postgis-2.0 and gt-imagemosaic-jdbc-9.1.jar support. I'm going through the tutorial with a PNG raster that i have. In ...
3
votes
1answer
36 views
How can I check if a multipolygon can be represented as a simple polygon?
I have a large (30m+ records) spatial data set I have imported into a PostGIS database. I did not expect to find multipolygons in the data set, but it does have a few of them. I'd like to take a ...
0
votes
0answers
21 views
not able to import raster data through raster2pgsql [closed]
I'm new to postgis and I'm not able to get through raster2pgsql. The problem is:
I want to import a raster (.tif) file using raster2pgsql. But after running the command:
raster2pgsql -s 4326 -I -C ...
2
votes
2answers
97 views
PostGIS: Convert meters to arbitrary spatial reference units?
I'm writing a query that needs to be able to work with data of any SRID. The basic problem is very simple - I get two pieces of information:
A point (SRID = 900913)
A distance (unit = meters)
I ...
2
votes
1answer
55 views
How can I make a Postgres/PostGIS ST_Distance_sphere query more efficient?
Within Postgres/PostGIS I have written an SQL query to get the closest distance for each element within a point coordinate table from a polyline table. The query comes back and works correctly, but ...
0
votes
0answers
35 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, ...
2
votes
1answer
66 views
Cannot find my schemas in QGIS's “Add PostGIS layers”
When I connect to my PostGIS database using QGIS's Add PostGIS Layers, I see only
public
topology
pg_catalog
information_schema
My other schemas that I have created are not shown here. Anyone else ...
0
votes
1answer
77 views
How to split line layer at polygons' boundary of a polygon layer?
I have a line layer and a polygon layer in PostgreSQL 9.2, PostGIS 2.0. How can I split every line each time it crosses a polygon's boundary?
1
vote
1answer
29 views
How to update SRID in PostGIS database
I am facing a problem when I am trying to execute few queries in PostGIS. It returns the following messages.
ERROR: GetProj4StringSPI: Cannot find SRID (4326) in spatial_ref_sys
********** ...
4
votes
4answers
186 views
Unable to connect Postgis from QGIS 1.8.0
I have installed PostgreSQL and PostGIS on my laptop (Win 7 64 bit OS). I am running QGIS 1.8.0 on my machine .
When I am trying to connect Postgis I am getting connection failed error then I tried ...
3
votes
1answer
41 views
PostGIS: Merge multiple table with same GID
I just imported some shapefiles with the PostGIS importer. Because several errors and issues I had to split my shapefile in multiple parts. Then I imported them one by one. I thought I can easily ...
0
votes
2answers
171 views
How to draw line in leaflet using postGIS road data
I have few points from server and I want to draw a line with this point on road. But the leaflet drawing point to point line as shown in picture in orange color. But I want to draw the line ...
0
votes
0answers
44 views
How a PHP script can perform point, line and polygon operation on Geoserver and PostGIS (+wkt) [duplicate]
I want to show my shape file and LULC map (vector and raster data) on internet explorer (locally). How should I configure PHP and Geoserver so that I can show data on localhost on an IE or browser? It ...
0
votes
1answer
68 views
How to show PostGIS distance in Meter
I have calculate distance from one point to a linestring. I have used the following query
WITH data AS (
SELECT geom::geometry AS road_network from linestring)
SELECT ...
2
votes
1answer
85 views
PostGIS ST_Contains question
Here's a quick summary about what I'm trying to do: Let's say I got two layers. One (A) with 10 polygons and one that is more granular with 100 polygons (B). Just to check if the behavior of PostGIS ...
3
votes
3answers
114 views
How to find lat/lon values for every pixel in a GeoTIFF file?
I want to a store GeoTIFF file pixel by pixel in the database. I need to store pixel values along with the lat/lon of that pixel on the GeoTIFF image. Is it possible to do that?
2
votes
1answer
354 views
Can POSTGIS 2.0 be install with POSTGRES 9.2 on Ubuntu 12.04 OS at the moment?
This question is more about environment set up.
At the current moment, March 4th 2013, can POSTGIS2.0 be install with POSTGRES 9.2?
I check their website out and to my understanding it is not ...
2
votes
1answer
113 views
How to import ECW into my postgis database with raster2pgsql (windows)
I'm working on windows 7 64 bits, postgis 2.01. I have to import ECW files into my postgis database. Unfortunatly, my postgis seems to has been compiled without gdal ecw support.When i do a ...
11
votes
1answer
158 views
Naming conventions PostGIS Database
We are starting to build up a database with PostGIS. The database is supposed to be for a team of about 5-8 researches who work frequently with geodata and statistics.
Has anybody experience with ...
1
vote
0answers
103 views
How to import 3D geometries from DXF, VRML or X3D into PostGIS 2
we plan to develop a webbased 3D GIS using PostGIS 2 and GeoServer with a W3DS. The architecture works fine, but i have problems to import 3D geometries into PostGIS. The geometries come from AutoCAD ...
0
votes
1answer
75 views
How to properly use PostGIS with Maps
First time using PostGIS in an app.
Target:
- Get Heat Map of customers from address table using leaflet.js and heatmap.js
Have DB called store_dev.
Installed OSM Bright from Mapbox in it.
Have a ...
3
votes
0answers
63 views
PostGIS 2.0 st_geomfromgml using LineString fails with invalid GML representation
I am attempting to insert a geometry into a table using the st_geomfromgml function.
The GML is being sourced from a Geoserver WFS request.
The function call looks like this
...
0
votes
0answers
56 views
ST_intersects and shortest_path to optimize routing in respect to (de-)acceleration
Is there a way to consider a more complex cost field in the PG_Routing algorithm?
I am currently trying to get more realistic routing costs. I have a map based on the German ATKIS standard with road ...
0
votes
0answers
21 views
Weird behaviour of ST_Project with PostGIS2
somehow I can't understand the results of ST_Project, but maybe this problem is just me being stupid (again):
Note:
I use geography-type here, but the results are the same for geometry.
I use a ...
2
votes
1answer
123 views
generate height data from DTED maps
I have 16 DTED maps of (1 degree x 1 degree). I have to generate combined height matrix of maximum 4 (1 degree x 1 degree) DTED maps in my C++ application.
Can someone suggest to me which open source ...
1
vote
1answer
147 views
Dynamically load and display shapefiles from PostGIS 2.0 into Mapguide using .NET
I have a C# mechanism for Loading shapefiles into PostreSQL/PostGIS now I would like to dynamically load it on Mapguide fusion template.In either C# or VB.NET code behind.
Use case is:
1.use uploads ...
2
votes
1answer
55 views
problems setting up postgis and importing data
Using Postgres 9.2.3.1 on a new Mac. I installed Postgres from the dmg file that I downloaded from the Postgres site. I then installed PostGIS using stackbuilder. This all worked flawlessly so far ...
1
vote
0answers
63 views
Renaming Columns in Geotools FeatureType
I am attempting to build a simple java program that loads shapefiles into a Postgis 2.0 database. Everything is working out great except that I would like to be able to modify the FeatureType in the ...
2
votes
1answer
81 views
How to Find the Nearest Node from a Given Coordinate
I have already developed a table manually. It contains the coordinates and the distance of all the nodes, there is no geom field or any field related to postgis. But I want to find out the nearest ...
3
votes
2answers
255 views
PostGIS - incorrect result distance between two points
I am quite confused the way PostGIS is returning the result for this basic query.
So I am trying to find the distance between two points
45.2714,71.2087 and 42.3739,66.39
and the distance should be ...
3
votes
1answer
133 views
Using PostGIS for a large trajectory dataset
I have a spatial trajectory dataset which basically contains about 10E6 (lat,lon,time)-tuples, grouped together by an identifier so they form trajectories.
Currently, SQLite is used to store the raw ...
0
votes
0answers
51 views
Create Polygon Overlay Handling Holes
How can I create a polygon overlay that correctly handles holes? This answer provides a method of creating a polygon overlay that does not handle holes. Can it be modified to correctly handle holes?
...
0
votes
0answers
16 views
Aggregation operation on raster files inside a raster database in postGIS Raster
I have a raster database in PostGIS Raster. I want to merge a number of raster files that are imported to the database using average to create another file. In the other words, the mean value of ...
6
votes
2answers
255 views
PostGIS SQL query to find a polygon that intersects with a line
I need to build a PostGIS query that would select every polygon inside an area the river is flowing through.
I'd better describe with an example below: There is a river (blue line) flowing through ...
0
votes
0answers
50 views
how to group interconnected edges inside a table?
Given a table and a random set of edges with source and target columns, how can I find out which edges connect with each other and then group them together using PostgreSQL?
1
vote
0answers
39 views
given sets of vehicle passing on each edge, how to get most used vehicle to avoid transition?
I have two tables: one, the resulting table from converting osm.xml via osm2po so I can use pgRouting, and another one that contains information on what edges each public vehicle passes through ...
3
votes
1answer
153 views
Transit Routing using pgrouting as core routing engine?
i'm a student and i'm working on a project. the aim is given two sets of coordinates(origin & destination) route through the map to determine the optimum path using public transportation and of ...
