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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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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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18 views

How to index spatial objects? [closed]

“R-tree is useful to store spatial objects such as restaurant locations”. I see this sentence a lot of time in internet but I haven't found the good explanation on this. Can anybody please elaborate ...
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2answers
38 views

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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1answer
113 views

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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0answers
104 views

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 extension. here ...
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1answer
31 views

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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112 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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0answers
110 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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2answers
128 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
284 views

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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0answers
571 views

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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1answer
110 views

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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1answer
79 views

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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72 views

Cannot open a SpatiaLite connection using ogr in Python

I need to open SpatiaLite connection to copy data to the database. This is my code: from osgeo import ogr dsc_in = ogr.Open(file_name) if dsc_in is None: raise Exception("Reading data failed.") ...
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1answer
194 views

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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1answer
137 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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2answers
41 views

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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1answer
357 views

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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1answer
193 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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0answers
60 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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1answer
285 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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1answer
42 views

At what point is the R-tree created?

Whats going on: I am working with postGIS and spatial datas. I am having trouble to fully understand the R-tree algorithm. Example query: In which town is point P located? My understanding so far ...
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0answers
533 views

What is the proper way to store geospatial data in SQL Server db table? [closed]

I am using OpenLayers at client side and the user is able to create new geometry points or feature and save it. All the new feature is stored in SQL server DB table. Each feature will have its own ...
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0answers
117 views

How to Unregister Replicas that have an invalid data-set information using ARCGIS REST APIs Version(10.2.1)

I am writing an application which will UnRegister replicas that are currently available. I managed to unregester new replicas which have the latest Server Url address stored in the DATASET_INFO field, ...
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1answer
225 views

Optimize intersection of polygons

I need to get the intersection of two polygons and both sides use the same dataset (titlenumberpolygon - UK National polygons). PostGIS is used in the analysis. First a spatial index was created ...
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2answers
100 views

Styles embedded in Spatialite database are lost while copying database

I have created a Spatialite database with several layers. I have customised the style for each layer and have saved the style as the default style in the database. All works fine when I connect to ...
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1answer
154 views

Merging multilane road into one lane

I have a road network file (openstreetmap exported file) that has various types of edges (freeway, highway, primary, residential, service, ...). Some of these edges have multiple lanes (parallel), so ...
3
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1answer
106 views

Organising PostGIS data within large spatial database? [closed]

I'm currently educating myself on spatial databases and have downloaded lots of open data from a regional authority. I know the technicalities on how to get that data into my new PostGIS database, ...
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1answer
125 views

Skipping projection errors in PostGIS

I have a PostGIS query that throws an error somewhere down the line: SELECT ST_Disjoint(ST_Transform(location, 26910),ST_Buffer(ST_Transform(ST_SetSRID(ST_MakePoint(-121.3991535, 37.7458),4326), ...
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1answer
60 views

How to query subdistrict with multilinestring

I use postgis database and I download subdistrict shapefile of thailand from: https://data.humdata.org/dataset/thailand-administrative-boundaries and I have my point latitude and longitude (13....
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0answers
40 views

Does ArcGIS Server allow the output data to be stored in a database? [closed]

There is a chapter in my bachelor thesis on database output storage support within various WPS implementations. In other words, I want to find out if the output data (data derived from processes ...
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1answer
305 views

Joining tables based on distance using SQL Server

I need to show the three closest hospitals to every house. I have a table of properties and a table of hospitals. Both are in MSSQL2012, have a geography column that is indexed and are in the same ...
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1answer
149 views

ST_Covers returning false with PostgreSQL/PostGIS

I have two lon/lats that I've turned into geometry. I've tried having the column type being both text and geometry. I have a fence_geom and a user_geom. I am looking to test to see if the user is ...
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1answer
537 views

Add Geography Column to an existing table

I Have an existing table GPSPosition which has a coma seperated LatLong column. I have attempted to add a geography column using the query: alter table GPSPositions add geographyColumn as geography:...
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1answer
227 views

Setting a Grid inside a shapefile in r

I am trying to crate a grid inside a shapefile, something like this. However, I am unable to generate such grid. I was wondering if anyone has an idea on how to accomplish this. Here is my code - ...
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2answers
282 views

Join two SpatialPolygons keeping any polygons which overlap

The best way I can describe my problem is that I’m after a left inner join for two spatial objects??? As you can see below, I have two spatial objects: (1) State of California [in blue] and (2) Grid ...
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1answer
392 views

How do I decide what sort of spatial index to build for a SQL Server table with a Geometry column?

Let’s say an organization manages a lot of GIS data stored in Sql Server and leverages Esri software. To ensure that users can access the data with reasonable speed, I want to make sure the spatial ...
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1answer
389 views

lines of a SpatialLinesDataFrame corresponding to points

I have a spatial lines data frame which can be projected on to a map. The projection is defined as WGS84. I have a Spatial Points Data Frame which is also in the same location. How can I isolate the ...
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0answers
2k views

Clustering latitude longitude data based on distance

I have a large dataset of latitude and longitude. I want to cluster the data into groups based on distance such that the distance between two points in a cluster is not greater than a minimum ...
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1answer
121 views

sdo_aggr_union is not working

I have a table map_building_data and I create view all_incidents_unions CREATE OR REPLACE FORCE VIEW ALL_INCIDENTS_UNIONS ( ORA_GEOMETRY ) AS SELECT sdo_aggr_union (MDSYS.sdoaggrtype (ora_geometry,...
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3answers
767 views

Is it possible to export spatial data from database to shapefile without writing SQL manually?

Shapefile is being imported to Oracle DB. Is there a tool to export this spatial data as a shapefile without writing any SQL (like you have to do with SQL Developer and GeoRaptor)? EDIT: from all ...
2
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1answer
304 views

DBScan with Convexhull

I am new to GIS, I am using PostGIS(2.3). I have two problems I am not clear with Problem-1: I have list of locations(longitude, latitude, 4326), what is best/correct projection to use while ...
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1answer
67 views

Updating sdo_geometry?

I have a table NEW_TABLE ID and ORA_GEOMETRY where id = 1 then ORA_GEOMETRY = MDSYS.SDO_GEOMETRY(2003, 32638, null, MDSYS.SDO_ELEM_INFO_ARRAY(1, 1003, 1), MDSYS.SDO_ORDINATE_ARRAY(462897.8239, ...
2
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1answer
367 views

Create a runtime geodatabase in QGIS for an Android app

I need to generate a runtime geodatabase for map visualization on my android device. Back in the days we used ArcGIS with local file-geodatabases, where we were just able to export a runtime ...
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2answers
263 views

Download Solar Insolation Data from NASA in R

I need to get solar insolation data from different parts of the world. I have several latitude and longitude coordinates and I would like to get a mean solar insolation value across different years. ...
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0answers
105 views

Speeding up closest point query?

I'm using PostGIS/Tiger for a mapping solution. For a given longitude, latitude (derived when someone clicks on a point in my Google Map), I want to retrieve the closest point from my table. My table ...
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0answers
178 views

Find midpoint of street geometry,with grid lines

Currently my application displays street name in middle of whole street, but when we use grids,we want to display street name in middle of street under grid,I want to calculate midpoint of street ...
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2answers
1k views

How to plot polygon in R from coordinates string?

So I extracted the boundaries from DBSCAN in python and am now working on R to create visualization in GGPLOT and LEAFLET but I can't get the polygons to plot. This is a sample of the data: [1,] "[(...
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1answer
159 views

dissolving polygon records that only fall completely in another polygon from the same table

I have a polygon table that consists of 700 records with the subtype of 'OutdoorRecreationalFacility'. this postgres table is supposed to be a table of 1000 foot buffers around certain parcels. ...
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1answer
58 views

How to find parent-child relationships between geometric features? Or is there another way of dealing with GIS data?

I have bunch of shapefiles from OpenStreetsMap. A simple understanding of human is that we know which feature is inside which feature. And it's mathematically constrained. In other words, it's ...