Questions tagged [database]

One or more structured sets of persistent data, managed and stored as a unit and generally associated with software to update and query the data.

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47 views

Import multiple PostGIS layers in QGIS map canvas via QTask QGIS 3

The vertex tool in red and the geometry displayed by the layer in yellow are not in sync from time import sleep from qgis.PyQt.QtSql import QSqlQuery, QSqlDatabase serverName = 'hostname' database = '...
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7 views

Load .osm changefile to my local database

I've successfully created a local tileserver on Ubuntu 18.04, now I need to edit the map I've uploaded on database. I created my own .osc change file from openstreetmap editor's iD and I need to put ...
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PostGIS: proper way to model object that follows sections of another object's path?

First, apologies if this has been asked before. I don't really know how/what to search for, and am struggling to just put this question into words. I'm trying to model aerial utilities in a PostGIS ...
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18 views

Storing earth observation derived attributes for polygons [closed]

I want to generate a number of vegetation related indices (NDVI, NDTI, etc., min/max/avg/std (pixel values)) from earth observation data for a large number of polygons during the entire growing season,...
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35 views

QGIS 3.6 - Updating layers from changing excel spreadsheet

I am building/editing a table and utilising Excel as the vehicle. When I change the spreadsheet I need to produce a new csv file and then re-import to generate new layers. Handling Excel spreadsheet ...
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48 views

Delete several tables in QGIS DB manager

I have a lot of tables in a PostGIS-Database and I want to delete most of them. In the QGIS DB manager, I am able to delete one by one (right-click - delete). However, that's quite annoying. How to ...
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1answer
41 views

How to make query of MySQL connection in QGIS?

i have added a connection with a MySQL database in QGIS (Add vector layer - Database - MySQL). Is there an option to make a query over the database in QGIS?
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1answer
26 views

ArcGIS attribute tables exploitation

I have kind of the same question as "greyline" : How to implement 3NF (third normal form) in ArcGIS attribute tables? I need, among other things, to place foreign key in my tables to combine them and ...
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45 views

Creating QGIS Symbology Database?

I'm looking to swap from MapInfo to QGIS at my work and im trying to see if its possbile to have a centralised symbology database. eg to be able to pull our symbology from a database rather than from ...
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1answer
29 views

Why the replace function in PostgreSQL is not returning the value?

I am trying to convert state names to abbreviations and I am using the replace function. I am able to run the snippet successfully but names remain the same without being converted to abbreviation: ...
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58 views

Exporting data to a text file using a template

I've build a toolbox in my project environment to plan "Aids to Navigation". The vessel (ship) that does the actual work in the field has a navigation computer that can only import waypoint. These ...
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2answers
45 views

write z-value from polygon layer to point layer in QGIS

I have two layers: 1 polygon layer where the depth of an area is written in the database (as DRVAL1) and and where the depth is exported as a Z-value to the geometry. 1 point layer that I use to plan ...
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47 views

Synchronisation problems using QFieldSync

When resynchronizing data from QField GPKG project to QGis SHP project, using QFieldSync, attribute data are shifted to the right column. There is a lag, I have never seen something like that before. ...
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1answer
69 views

Which provider should I use with `qgis.core.QgsVectorLayer` method at `PostgreSQL database with PostGIS extension` storage?

I use PyQGIS 3.6.1 Noosa to load layer from my database storage PostgreSQL database with PostGIS extension using qgis.core.QgsVectorLayer method. But layer is invalid somehow. Performing same ...
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1answer
65 views

Default expression won't write to database

Made this expression and put it in the defaults value box.: CASE ---cardinal WHEN ("CATCAM" = '1')THEN'2,6' WHEN ("CATCAM" = '2')THEN'2,6,2' WHEN ("CATCAM" = '3')THEN'6,2' WHEN ("CATCAM" = '4')THEN'...
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1answer
159 views

ogr2ogr conversion failed when converting the varchar value to data type int

I keep getting this Error 1 when I run the following on some tables ogr2ogr -skipfailures -f "MapInfo File" -lco overwrite=yes -lco launder=no -lco relaxedFieldNameMatch "D:\QG\CREFNO.tab" "MSSQL:...
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1answer
225 views

Connect ArcGIS 10.6 to Oracle 12c Enterprise Edition

I want to connect ArcGIS 10.6 to an Oracle 12c Enterprise Edition. However, I found different informations on the Esri websites on how to do so. I followed this website (http://desktop.arcgis.com/...
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121 views

ArcGIS Pro connection to PostgreSQL Database

I am connecting a PostgreSQL database to ArcGIS Pro and it connects but when I attempt to open the attribute table I receive a "Shape Integrity Error" and cannot view it. I am able to view the ...
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1answer
116 views

PostGIS view on multiple geometry columns

I have two PostGIS tables, ‘filelinks’ and ‘maricopa_plss_qtrqtrs’. The filelinks table has a geometry type column named ‘geom_p’ and the maricopa_plss_qtrqtrs has a geometry type column named ‘geom’. ...
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186 views

GDAL PostgreSQL shapefile import “Unable to find driver 'PostgreSQL”

I have seen a number of posts similar to this but with no resolution. I am experimenting with GDAL commands and am fairly new to it however when using a PostgreSQL database connection I am getting ...
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25 views

QGIS how to make options in valuemap invisible when outside constraint

I am making a geopackage to plan aids to navigation in a maritime environment. I have made the design of my attributes form with the drag/drop designer. The constraints I put in work i.e. If i choose ...
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37 views

Complex edge conditions on geo-edges

Spatial graph databases are capable to find a shortest path from the node A to the node B. Are there any DB which allows complex conditions on nodes and edges between them? For example: The node is ...
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184 views

Can I use SpatiaLite database using Room for Android?

I want to use the SpatiaLite database using Room library for my project. Is it possible to do? I have heard there is a custom open helper for the Room which might help to use the SpatiaLite db. But ...
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66 views

How to attach one spatialite database to another in db manager

I'm trying to attach one database to another so that data from it can be used in queries. I'm using ATTACH DATABASE '{full url}' AS {database_name}; No errors actually occur, but when I run PRAGMA ...
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2answers
578 views

PostgreSQL select value where '100%' using bigint

I am trying to select data from a bigint column in PgAdmin using SQL: SELECT FROM public.addressbaseplus WHERE uprn LIKE '100%' However, I am getting the following error: ERROR: operator does not ...
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160 views

Does Redis geo have the capability for storing polygon?

I followed the example here and also here about geospatial support in Redis. I tried to add POINT features to my Redis dataset, and subsequently I can query POINT names within certain radius of a ...
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37 views

How to have a record id without geometry?

I have a buildings shapefile layer and every building has a building ID linked to its feature id ($id). Some new buildings have been built and old buildings were demolished. I'd like to not recycle ...
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1answer
196 views

Transfer data from SQL database to postgre database using GDAL

I am new to GDAL and have been uploading CSV crime data to a postgis database using ogr2ogr. ogr2ogr -f "PostgreSQL" -lco GEOMETRY_NAME=geometry -lco FID=gid PG:"host=server user=user dbname=dbname ...
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2answers
343 views

Healthy number of tables in PostgreSQL schema?

I manage a PostgreSQL + PostGIS database with two schemas of 200 and 120 tables. I wonder if this is correct or I should organize the tables in more and smaller schemas. So far, we hadn't had any ...
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1answer
323 views

PostGIS update column with selected

I am new to database sorry if this is basic. I have selected point geometry from a geometry column in pgAdmin, however, I would like to know how to now copy the selected points to a new column? This ...
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2answers
227 views

QGis 3.0 Multiuser Access

How does multiuser access work in QGis 3.0? Can multiple people open and edit the same object in a layer and save it at the same time? (Edit: Yes, but it may cause loss of data) Does it warn you ...
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1answer
33 views

Editing DB contents

I have loaded polylines from the CSV below: name;type,status;wkt 01001-4;Integrated;virgin;LINESTRING(xx.x yy.y,xx.x yy.y) and it populates the table in the DB. What I would like to do is change ...
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2answers
181 views

PostgreSQL - only allow points to be added to the table (no polygons or lines)

I want to know if there is a way to only allow certain Geometry types to be added to a table in PostgreSQL. I have a tool that currently allows points, lines and polygons but would like to restrict ...
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2answers
139 views

Is there an easy way to implement INSPIRE model in PostGIS?

I need to implement INSPIRE (Infrastructure for Spatial Information in the European Community) model in PostGIS. I searched everywhere but couldn't find SQL file, or any other implementation that I ...
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1answer
61 views

Postgis pgAdmin ST_area returning different to other GIS's

I have a shapefile which is returning a different area value in pgAdmin than in FME, Cadcorp SIS and QGIS and I don't know why it is different in pgAdmin. The setting used in pgAdmin are: SELECT ...
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42 views

Trigger history_ How can I define the last updated column?

I am trying to implement a trigger function in PostgreSQL. I've written this trigger history function: CREATE OR REPLACE FUNCTION history_update() RETURNS trigger AS $$ BEGIN INSERT INTO ...
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1answer
189 views

What Datawarehouse can process geospatial informations?

I'm currently using a PostgreSQL database with the PostGIS extension. My querys are growing to big for my inhouse server, so I would like to port this into the cloud. The querys mainly compute the ...
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3answers
127 views

Finding the “square” bounding boxes of a country

I want to find the square bounding boxes that cover a country, of different sizes. First off, I know that they won't really be square, but just going by the numbers they can be said to be. The main ...
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180 views

Geoserver+postgis: how to complete creating database via REST API?

I'm using geoserver 2.13.1 with postgres 9.5 and postgis 2.4.2. I am trying to use REST api to create workspace (works) and in it a datastore of postgis type. I have already prepared a template ...
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106 views

Automatically backup from qgis to pgadmin

I have got postgres (pgadmin 3) + qgis link. And I think about next thing: how i can work with postgis layers, in a way that, backup file of my spatial database will created automatically for example ...
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1answer
92 views

How to convert QGIS 3.0 project to use auth_db ids

I am working on a Mac and running QGIS 3.0.3 and I am exploring the authentication db setup. I have a bunch of layers almost all of which are based on PostGIS queries and I want to move all my ...
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1answer
191 views

Create a point shapefile from table in .accdb database

I am a beginner in Python. I have a database in .accdb format of Access 2007. The database has a table called "T_point_RT" which has point data. I want to create a point shapefile from North and Est ...
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25 views

How to reproduce this type of server-side authentication?

A Server Connection that I have is username and password protected, and so this prompt pops up when you open the mxd. I am trying to understand the system we have here better, and would like to be ...
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1answer
29 views

Is it possible from inside QGIS to analyze a number of occurrances (non-points) of a given variable repeating in a database to map it?

I have a database with each and every death in a country, each row in the database has a GEO_REFERENCE tag constructed by the concatenation of a code given to every division and subdivision instead of ...
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1answer
365 views

What to do about QSqlDatabase: QOCI driver not loaded [closed]

QGIS - 3.0.1 I am trying to connect to the Oracle database. I am not an expert in QGIS, pyqgis at all. I took help of following code to connect to Oracle database. Connecting directly to an Oracle ...
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1answer
189 views

What is the max amount of connections a GeoPackage can handle in GeoServer?

I'm currently working on a GeoServer deployment and for simplicity, I want to to transition to using GeoPackages rather than Shapefiles (longer column names, less work integrating the data, etc.). As ...
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1answer
173 views

Can't insert a value into the table. PyQGIS 3.0. Postgresql [closed]

Can't insert a value into the table. PyQGIS 3.0 import psycopg2 conn = psycopg2.connect(dbname='postgres', user='postgres', password='1', host='localhost') cursor = conn.cursor() cursor.execute(""" ...
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0answers
57 views

Common information shared between Geopackages [closed]

I'm trying to build a map in which I have a few geographical units organized as such. Commune ---1:N---> Contrada Contrada ---1:N---> Vineyards One commune may contain many contradas, which ...
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1answer
253 views

Register with Geodatabase greyed out

I'm having trouble registering a table with a Geodatabase in an SDE, the option is greyed out. This is a weekly task for me and I have never had this happen before. I receive a new table weekly from ...
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1answer
467 views

Import data table from database into QGIS using PyQGIS

I need to import a data table from a database into QGIS using PyQGIS. This table is not QgsVectorLayer and there is not any geometry. That is probably why this is not working. How can I do it? uri ...