Questions tagged [spatial-database]

Spatial database is a database that is optimized to store and query data that is related to objects in space, including points, lines and polygons.

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Spatial indexes with RTree for polygons

I am trying to understand about how R-tree works for polygon data. In other words, polygon is a list of vertices (points), however, I am wondering how spatial index can recognize the order of points ...
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3 votes
2 answers
139 views

How to use a list with spatial dataframes in a for loop? - R

I have three spatial dataframes (polygons), created via this tutorial. The three spatial dataframes must be exported as shapefiles via a for loop. I created a list polygons containing the three ...
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Adding Timestamp to attribute table in QGIS

I have the project where, in one part of it, I need to add the timestamp to uniform generated points along the line (road, in my project). There is a road and uniform distributed points on it, which ...
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Create one PostGIS connection in QGIS with multiple databases from one host?

I have a number of spatial databases each containing multiple schemas on one server, I want to use QGIS to examine layers, Is it possible to create one PostGIS connection in QGIS and add all databases ...
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Transferring/inheriting GIS database structure in PostGIS from old project to new one

I have been given an existing GIS database design for a solar power project, with its structure, relationships, geometry etc designed from another project and existing in PostGIS database. I am ...
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QGIS is not displaying geometry features for MySQL table

I'm currently working in a MySQL database version 5.7. I've a polygon table that was created using the following way: CREATE TABLE coords( ref_geo CHAR(80) NOT NULL, geom GEOMETRY NOT NULL ); I ...
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4 votes
1 answer
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Appending characters before the filename of all layers in a GeoPackage in QGIS?

I have a geopackage which contains around 30 files. I want to put a "mmbl_" before the actual file name for all the layers in the said geopackage. Is there a an SQL expression to automate ...
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What geospatial table and indexing functions are suitable for a borehole database design for large volume of serialised constant increment data?

Pretty common use case I suspect, but want to make sure I optimise from the get go. PostGIS I'm suspecting is the weapon of choice, and one way I'll be interrogating data is QGIS. Large part of data ...
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How to open QGIS project without being asked for PostGIS credentials every time

Problem: We have several layers stored in a PostgreSQL database with PostGIS extension (Stored on AWS RDS Instance). The connection has been working perfectly to date. I get asked for login ...
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I just imported some shapefiles to a PostGIS database, where can I find the files in my drive?

When I installed PostGIS, the default directory for all data is C:\Program Files\PostgreSQL\13\data but I can't find any folder that seems to be related to the database (named 'discover') that I made.
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QGIS Set Master Password

I installed a fresh version of the QGIS LTR 3.10. I am working on creating a postgres server from a raspberry pi4 and connecting the database to my qgis. Through a tutorial I am walking through, they ...
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Spatial indexing of GeoTIFF images (Java Library)

I have a requirement to spatially index each pixel of GeoTIFF images and store them in a scalable database. I intend to perform this in the following manner. Divide each GeoTIFF into smaller tile ...
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GIS Database format functional differences [closed]

We are a small team (10 p) working on spatial planning. We are using QGIS as a main tool. We have a lot of open source data, we daily use on multiple projects, and therefore some files are duplicated ...
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-1 votes
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How can I insert a satellite image with multiple bands into PostGIS?

I am trying to insert a satellite image (e.g. a Sentinel Image) into PostGIS. What is the best structure to save the different bands? I know that you can use somehow use 'ST_AddBand' or 'ST_Band', but ...
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Maintaining Form Designs with one Geopackage to Multiple Different Projects

I work for an Archaeological consulting company in Australia and one of the major parts of our job is to go out and survey for aboriginal heritage sites before constructions can be approved. The ...
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Sharing QGIS Project that connects to local postGIS database

I am looking to share a QGIS project with a few others outside my network. The QGIS project is using layers from a postGIS database I created locally. I am wondering what the best way is to go about ...
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Converting points with an associated circumference to a raster overlay

I have a data frame in r with x and y coordinates and each point has a circumference (tree_crown) around it. I'm wanting to build a raster file that each cell would have a value equal to the percent ...
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2 votes
1 answer
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Creating one-to-one relationships in QGIS

Can I create one-to-one relationship using project relations in QGIS? I am trying to create a spatial database in QGIS. I want to link my attribute data to my spatial data (shapefile). I have already ...
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Linking or joining data in MS Acess to shapefiles in QGIS

I am creating a spatial database for five buildings for a project that I am working on. I have spatial data in the form of a shapefile and attribute data in Microsoft Access(with a table and queries). ...
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1 answer
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Problem with CLOB data type when running ogr2ogr command

Using ogr2ogr, I transferred data from the oracle database to the postgres database. However, the table "table" contains attributes that have a "clob" as a data type, which were ...
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Import OS Mastermap to PostgreSQL database

I have ordnance survey master map a coverage for the whole of the UK. These are currently received on a disk every 3 months and arrive in .gz format. Does anyone have any recommendations on how to ...
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Two persons working on same layer in QGIS [closed]

We are two people who need to edit on the same layer in QGIS. For example one of us will edit locally, the other one via a server connection.
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2 votes
1 answer
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Create a new connection in QGIS 3.4.3 DB Manager

I am trying to establish a new database connection from QGIS 3.4.3 to Postgres/PostGIS. I have two connections established but I can't find any options to establish another connection. I cannot recall ...
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Exracting data fromSpatialPolygonDataFrame conditionally in R?

For some research I am working on, I have a dataframe called charters of charter schools in New Jersey. Simplified it looks like this: school.name school.id district.id lat ...
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Store and observe changes of polygons through time?

What approach should be used to have the ability to store and observe changes of polygons? For example if you have an area where many parcels of land have changed owners and dimensions (larger/...
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-2 votes
1 answer
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Local coordinates in NoSql database

Is there any nosql database which supports the below 1) Should support local coordinates (spatial data which holds the coordinatesof door, Infra, etc.) 2)Integration with Geoserver.
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1 vote
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Find every possible user to user travel time duration using pgr_dijkstra or pgr_kDijkstra

I have this below GetNearest function that will get every user's nearest node from ways (imported using osm2pgrouting). CREATE or REPLACE FUNCTION GetNearest(NUMERIC, NUMERIC) RETURNS BIGINT AS ...
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2 votes
1 answer
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Find gaps in spatial database based on attributes and fill those caps with new features with existing attributes

I have a big line shapefile data (over 2 millions features) showing animal movements. Simplified example: ID    Year    st_time     end_time&...
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2 answers
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Visualize geographic spatial data from SQL Server directly in PowerBI

Is it possible to directly query geographic spatial data form SQL Server in PowerBI like its possible with Tableau? https://cloudblogs.microsoft.com/sqlserver/2018/05/14/visualize-geographic-spatial-...
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1 answer
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password authentication failed for user "ASUS"

I'm creating table in PostgreSQL using these commands: shp2pgsql -s 32632 watershed.shp watershed > watershed.sql psql -f watershed.sql cambridge psql -f watershed.sql cambridge But I had ...
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2 votes
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DBeaver spatial output window: Is it possible to sync/filter spatial query to map bounds?

While upgrading PostGRES/PostGIS from 9.x to 11.x, I have discovered DBeaver and so far I am pleased. Apparently it has some spatial integration, including the ability to visualize spatial data ...
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Can relation reference in QGIS and QField be used to fill stochastic matrices?

I am a novice GIS user and am just seeing the potential for relations in my work. A problem I've come across and would like a solution to it. I have two stochastic matrices (risk matrices) that ...
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SQL layer wont ORDER BY in CARTO VL

I have a dataset that shows the borehole yield for fractured aquifers in South Africa. Using the "yield_ls" column, my CARTO VL legend looks like this (notice how the 4th item should be the first). ...
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2 answers
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Clarification on Oracle sdo_gtype

I need some clarification on oracle sdo_gtype 4402. I understand that sdo_gtype is codded as DLTT. D: Dimension L : linear reference T T: TT identifies the geometry type. It's clear to me that first 4 ...
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4 votes
1 answer
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Accessing PostGIS data in QGIS?

I've created a two new PostgreSQL users; one that is supposed to have read-only privileges and another one that should have most privileges (admin-user). When I connect/log in to the new users in QGIS ...
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3 votes
1 answer
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GeoDjango application using SpatiaLite database

I want to create a simple GeoDjango app with SpatiaLite database but I have this error at migrate: django.core.exceptions.ImproperlyConfigured: Unable to load the SpatiaLite library extensio`. ...
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Extracting and transposing a single record in db manager

This seems like a simple operation so apologies if I've missed an existing answer. What I need to do is extract single record (a client) from a database of clients (in Spatialite) and present the ...
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1 vote
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271 views

What's the most size-efficient spatial database [closed]

I'm configuring a tile server on Apache Mesos. From all the tutorials I've read, I gathered that PostgreSQL and PostGIS is widely used for this purpose. I learned that MongoDb and MySQL Server also ...
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2 votes
2 answers
582 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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3 votes
2 answers
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Using SqlGeometry.MakeValid to get a counter-clockwise polygon in SQL Server

The data I've loaded from a shapefile into a geometry column in SQL Server (using NetTopologySuite) is not producing valid GeoJSON when I export it because it doesn't follow the right-hand rule. I ...
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6 votes
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When does WKT orientation matter for polygon and multipolygon in geography spatial (left/right hand rule, counter-clockwise, clockwise)

I've decide to use sql server on Azure for my gis database. I'll be dealing with spatial Geography not Geometry. While inserting some country boundaries using the spatial data in SQL Server, some ...
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2 votes
1 answer
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How to extract values from multiple rasters and polygons for given coordinates

I have roughly 30 predictor variables in raster and two polygon shapefiles format that I am trying to extract values from for a given response variable coordinates. I have already done the following:...
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0 votes
2 answers
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Copying raster to SQLite using GDAL?

I want to copy a raster file into SQLite database. Previously, I did the same with vector data like this: def store_vector_output(self, file_name, identifier): from osgeo import ogr drv = ogr....
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Nearest point on line from a point in PostGIS and its attribute value

Consider the following image; I have points (shown in blue circles) stored in my database with their geometry and an attribute value. Additionally, I have another table with User Points (yellow ...
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13 votes
1 answer
378 views

Is the ST_ prefix appropriate for functions not included in SQL/MM Part 3?

I was reading a thread on the geospatial extension for Presto in this Github issue, where a function, line_locate_point, was introduced. It was based off PostGIS's ST_LineLocatePoint function, which ...
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2 answers
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Add column to show intersection with another layer

I have a table containing a list of properties. I have a successful query to return only those that intersect another layer. However i want to return all the properties now and instead return a new ...
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0 votes
1 answer
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MySQL GPS distance calculation is failing

MySQL 5.6 here. I'm storing GPS coordinates as MySQL Point types in my DB and am trying to build a query that takes a single GPS coordinate (consisting of latitude and longitude components) and ...
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1 vote
1 answer
963 views

Export spatial data from SQL Server to ESRI shapefile using OSGeo

i did a join between 2 tables departements2 which has all department with their id and geometry with BM_REGIONFR with id of department and region ( i have 5 region in each region many departement ) ...
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2 votes
0 answers
95 views

Layer length statistics in print composer QGIS

In a QGIS composer, I would like to add a text label with the calculation of % of length of the total layer with a specific feature value. My layer is composed of roads lines and I would like to ...
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5 votes
2 answers
2k views

Saving styles for all layers using PyQGIS - SLD, QML, databases

I wrote a script (for QGIS 3) that saves styles for all visible vector layers in QML and SLD files: import processing self=qgis.utils layers = self.iface.mapCanvas().layers() for layer in layers: ...
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