PostgreSQL is an open source object-relational database system.

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How to format SQL expressions for ArcPy with ArcSDE for PostgreSQL feature class?

I'm trying to use SelectLayerByAttribute to find the last point added to a FC. I figured I could use the objectid field because it's serial. I wrote the following: ...
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1answer
77 views

Creating geodatabase administrator account other than SDE?

I need to create another account other than SDE and make it geodatabase administrator. Is it possible? I have already created another account and have given SUPERUSER priviledge. However I cannot do ...
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2answers
59 views

PostGIS query to retrieve the largest polygon for multi-polygons by grouping on attribute field

I'm working with the Natural Earth 10m Admin 1 States Provinces polygon data. This dataset contains multi-polygons for each state / province in the entire world. What I'd like to do is to grab the ...
3
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1answer
743 views

Duplicate ObjectID in ArcSDE Table

After making a check in from an arcpad AXF file, i notice that there's duplicate ObjectID records. This ArcSDE PostgreSQL table is versioned and edited by Axf checkins and a .net engine application. ...
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52 views

Copying File Geodatabase to PostgreSQL using ogr2ogr?

I am trying to export Feature Classes and Tables from GDB to PostgreSQL. I am using ogr2ogr tool to export from GDB to PostgreSQL. I am using following method: ogr2ogr -f "PostgreSQL" ...
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1answer
97 views

How to update a postgres/postgis table periodically with multiple data?

I have created a postgis table from point.shp with 5 fields containing 20 records. Now I want to populate the table with another 150 records keeping the previous 20 records so that the total records ...
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1answer
265 views

Get Multiple Shortest Path using PgRouting in One Query

I am trying to get multiple shortest path using A* Algorithm available in PgRouting. I referred Solution given by UnderDark ( Link of the Stakoverflow Post ) . But it is not giving me proper Output. ...
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1answer
48 views

Tilemill/PostgreSQL Connection refused Error

I have been trying to set up a MBTiles Export using PostgreSQL 9.2 and the Latest version of Tilemill. According to the postgreSQL Logs, I am receiving an error, and I cannot figure out why. I have ...
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39 views

Postgres PostGIS geocode_intersection()- How to handle exception?

I have a table in Postgres with a set of records that are street names which needs to be geocoded to get an intersection point.Some of the records would be bad input and when using the ...
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1answer
45 views

from two tables make a new one

I have two tables both of them has linestring geometry. I try to make a new one which contain the first one and from the second take only the decimal v when the linestring of the first table touch a ...
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0answers
16 views

Import postgis layer from S3 link

I have a postgis layer (layer.sql), which I am trying to add to my postgres database (mydatabase). The postgis layer is stored on S3 (https://s3.us.../layer.sql). I can add the layer to my database ...
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84 views

PostGIS Clustering. Group by geographic point location proximity

I have a table where i keep user's location history. The system gets user's current location each minute and writes it into "user_locations" table. Later on; when showing the locations that the user ...
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2answers
52 views

Combining ST_Touches and ST_Buffer

I'm looking for a PostGIS/Postgres query thats a bit tricky. I want to find all polygons within a specified radius and all neighboring polygons to the polygon where I have my coordinates SELECT * ...
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0answers
158 views

Use postgis functions in restful web service java

I am trying to access Postgis functions in Restful web service JAVA. I am using netbeans 8.0.2, Glass Fish, J2EE 7 to create web service, PostGres 9.2 and postgis 2.1.1. Connection to postgres is ...
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2answers
138 views

How to create a bounding box around a point using postgis

How to create a bounding box around a geom (POINT) and find all the intersecting geoms(POINTS) within that bounding box? Thanks in Advance
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2answers
40 views

Getting year from a field of type character varying

I did an intersection between two tables and the resulting field has an sdate of type character varying (29). An example value is 2012-01-13 05:00:00. How do I get just the year from it? I want to ...
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1answer
72 views

PostgreSQL 'forgot' PostGIS functionality

System details: PostgreSQL 9.3.5 64bit on Windows 7 Ultimate; PostGIS 2.1.3 Two days ago I re-organised my schema structure - effectively moving a series of tables of the form ...
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1answer
402 views

How to create pop-ups with graphs on point layers?

i have a postgresql database which is refreshed all 10 minutes and i need to create graphs in pop-up with the data. When i click, a pop-up (or annotation ?) appears. How can i make it possible ? ...
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1answer
85 views

Adding vertices to polygon in PostGIS?

For example I have rectangular polygon (4 vertices). I want to add mid-point on each line of the polygon, so in total now I have 8 vertices. And from them I want to build new polygon who will have ...
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1answer
33 views

Which is the correct Options 's “Hydraulics” field in EPANET?

Which parameter has to be given into Options 's "Hydraulics" field in EPANET? Has it to be only a name or a complete file name with the extension? In my case .rpt doesn't work, neither without the ...
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2answers
138 views

Sql Query in Postgresql

I am trying to execute a query but I am stuck. I have two tables A and B. The a table has columns gid, geometry(line-string) and value which cells is empty , the B table has got 3 columns gid, ...
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2answers
74 views

ST_Area of a buffer differs by coordinate

Why are these results different? The only difference is the coordinate. Seem like the area should be the same. select st_area(st_buffer(st_setsrid(st_point(-70, 40), 4326)::geography, 10)) AS ...
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22 views

access the encrypted table in qgis

I have a vector layer in qgis connected to PostgreSQL database table. Suppose I encrypt the table column using pgp_sysm_encrypt or some other encryption in PostgreSQL Is there any way i can say ...
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3answers
1k views

ST_MakePoint or ST_PointFromText to generate points

I'm new to postGIS and am having trouble finding an answer to this question. I have loaded UK postcode data (OSGB36, SRID 27700 with eastings and northings fields) into a postGIS database. I now want ...
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1answer
51 views

How to transform from a SRID to another?

How can I transform a geometric column of table from "SRID=4326" to "SRID=32650". I saw "ST_Transfom" and " ST_SETSRID" operator before. To do so, I used follow construction operator, But it dosen't ...
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1answer
379 views

How to resolve the postgis “type geometry does not exist” issue on installing tiger_geocode extension?

I have installed postgis extension in my db. I have few columns associated with its type in few tables and now I would like to use reverse geocode functionality in my app. Hence I tried to create ...
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1answer
31 views

How to set srid of a single point coordinates pair?

I think is better explain with a small example: selected a geometry point i get it back in a coordinate pair SELECT ST_AsGeoJSON('010100002031BF0D009A999919F9BD2D41CDCCCC4C758E5241') --result: ...
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1answer
47 views

How to merge(transfer) one layer into another postgis layer?

I want to merge 2 layer which have identical structure. First layer is from postgres database table say "layer1" and other layer is shapefile say "layer2". I want to merge layer2 "INTO" layer1 (NOT ...
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1answer
129 views

counting overlapping polygons - ST_Union very slow, how to make it more efficient?

I have a set of 1000 polygons that overlap and I want to count the areas of overlap. I am using this blog post's instructions to create multilines from the 1000 polygons then use this line file to ...
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1answer
100 views

PostGIS: Closest outside point to point inside polygon

There is the famous ST_ClosestPoint() return the closest point inside polygon to some outside point. I'm looking the inverse problem: I have a location inside polygon, and I want to get the closest ...
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39 views

PostGIS: Lines from location touches but not intersecting polygons

I have OSM .shp file of buildings. I created vertices along each line of the building in that way: vertices (red) & mid points (green). The mid points made by ST_Line_Interpolate_Point() after ...
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1answer
36 views

How to use intersection in spatial guery in postgresql?

I want to get id, time and point_metric columns from intersection between two geometry(geom_lines and gem_houses). I wrote following sql code, however it fore an error (argument of WHERE must be type ...
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2answers
241 views

PostGIS: Closest polygon to point [duplicate]

I have .shp file of polygons and single (point) location. How can I retrieve the closest polygon to that single location? Thanks,
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1answer
60 views

With schema, function postgis_full_version() does not exist

A rails application is configured to run with postgis. Database.yml is configured as follows: development: adapter: postgis database: app_development username: simpleton schema_search_path: ...
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46 views

Error's while retrieving data from postgres to Qgis using python?

This is my code of python in qgis from qgis documentation docs uri = QgsDataSourceURI() uri.setConnection("localhost","5432","gis_data","postgres","vajja") ...
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0answers
32 views

How raster files are stored in databases?

When storing raster files in PostgreSQL only one row is created in the database, but the raster is a matrix so typically it must create rows and columns. I want to understand how raster files are ...
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0answers
73 views

Issues creating ArcSDE sde_logfile for certain users (username begins with a numeral)

I am having issues when editing an sde feature class from certain users. The way my database is set up is that the authentication roles are updating constantly by comparing the current authentication ...
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3answers
434 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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1answer
34 views

Get points in a union of circles

I am trying to create a postgis query that would get all the points in an union of circles (possibly more than a thousand of circles with different radius). The circles would be created dynamically ...
3
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2answers
160 views

How to classify a raster using QGIS Plugin interacting with PostGIS?

I'm developing a QGIS plugin where users can enter some parameters (like distance, depth, area...) and by submiting the plugin interact with a PostGIS database and extract informations form vector and ...
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1answer
60 views

Error while connecting qgis with postgres?

sql="select long,lat from poidata.poi_ca from where city LIKE '%unnyvale'" uri = QgsDataSourceURI() uri.setConnection("localhost","5432","gis_data","postgres","vajja") ...
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2answers
224 views

Problem with PostgreSQL View layer in QGIS

I have a PostgreSQL table and view: CREATE TABLE lines ( geom geometry(MultiLineString,4326), type character varying(254), login text, gid serial NOT NULL, ...
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1answer
105 views

Issue using pgr_dijkstra from Postgres pgRouting

I am using Postgres with Postgis extension to retrieve streets (only for pedestrian use) and several "natural" points. I need to make updates every minute and i am working on a small bounding box. For ...
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0answers
48 views

Postgis ST_Azimuth only returning a small range of angles

I have a puzzler with postgis and ST_Azimuth. I have a table of points (taken from country borders, and run through the QChainage plugin). I want to find the azimuth from a fixed point (15.0,50.0) to ...
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1answer
57 views

Percent total from postgis clip

How would I calculate the percentage of streets that have sidewalks summarized by census tracts using PostGIS. My sidewalks file has an id that links it to its adjacent street and I've worked out how ...
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56 views

using changeset for larger region to update OSM data in PostGIS

I'm using the OSM import and update workflow described here to maintain OSM data in a PostGIS database. Import (osm2pgsql): osm2pgsql -c -d gps -U gps --cache 8000 --number-processes 4 --slim ...
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1answer
70 views

A few PgRouting database design questions

Does someone know how the cost field in PgRouting is calculated? What are 'source' and 'target' good for? 'osm_source_id' and 'osm_target_id' contain the same information using different numbers. Is ...
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1answer
62 views

How to select from geometry column in postgresql?

I've got a table which it has a geometry column filed by some point (ex. "POINT Z (116.309627 39.991285 148)"). now I want to select point's id from the table. I wrote follow sql Code but I force an ...
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45 views

GeoTools How to add attribute to a schema in DataStore

As you know, you can create a schema in a DataStore. For example, you may create a table in a postgresql database like this: SimpleFeatureType schema = ...;// some schema DataStore dataStore = ...
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3answers
861 views

clustering points in postgresql to create contour map

UPDATE: To try to make this a little more simple, is it possible to create a query which selects a group of points such that each point in the group is at most X units away from at least one other ...