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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46
votes
3answers
11k views

Are there newer routing algorithms (than Dijkstra, A*) in GIS databases?

There are works like Reach for A* from Microsoft researchers and Highway Hierarchies by Sanders and Schtolz (if I spell the name correctly) from Karlsruhe Uni. Both of them reduce the calculations ...
30
votes
6answers
27k views

QGIS, Postgis: Geometry type does not match column type

I'm trying to import some polygon shapefiles to Postgis in QGIS via SPIT. One of them can't be imported and returns this error: ERROR: Geometry type (Polygon) does not match column type (MultiPolygon)...
26
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9answers
6k views

Is there any way I can use a Key-Value store for geospatial data?

I have used many relational databases in the past, but I have also read about all NoSQL databases, and the Key-Value stores looks interresting. When I store geometric object I mostly use five indexed ...
25
votes
5answers
12k views

Database for offline slippy map tiles

I currently have an offline HTML5 map application (built on Leaflet & KendoUI with custom additions) that has an app manifest and works fine on multiple platforms. However, I am hesitant to use ...
24
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3answers
32k views

How to create a new 'gis' database in PostGIS?

I'd like to create a new database in PostGIS, so I can load stuff into it while the current database is being used. According to the docs Some packaged distributions of PostGIS (in particular the ...
22
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3answers
1k views

(When) should I use a GIS-enabled database?

I am a long-time programmer, new to GIS. I am trying to get a feel for the database aspects of GIS and I understand that there are some databases which are specialized for GIS use. Basically I am ...
21
votes
9answers
21k views

Choosing database for storing spatial data?

A couple of days ago I installed the demo of spatialware 4.9 from MapInfo into my SQL Server 2005 install and loaded all the larger dataset into it. I was quite impressed with the performance vs the ...
21
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2answers
2k views

What is the best hack for importing large datasets into PostGIS?

I have to import large Shapefiles (> 1 million records) into PostGIS, and I have been wondering about the best way to do it. In my question I used the word "hack", instead of tool, on purpose because ...
16
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2answers
2k views

Need a spatial database that can be used by QGIS and R

I'm quite new to QGIS and I'm searching for a simple way to create a Database that allows me to use the tables in QGIS and R. I have a lot of data stored in Excel spreadsheets wich will be used for ...
16
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2answers
1k views

How do you protect your PostGIS credentials when using QGIS 1.7?

I'm fairly certain this should be a community wiki, but I don't know how to make it one. So if an admin sees this please change if appropriate. So... how do you protect your PostGIS database data ...
15
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4answers
2k views

Database design: road topology in GIS

Is there a standard or a best practice way to store certain features about roads: Road directionality: One way streets: Roads going in one direction only Center Turning lanes: roads that exist ...
14
votes
3answers
3k views

How to refresh the attribute table of a layer after editing the table in the DB-Manager?

Is there any way to refresh the attribute table of a layer after editing the table (e.g. add a column) in the DB-Manager?
13
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4answers
3k views

What is a good taxonomy or naming convention for files and folders containing GIS data? [closed]

My company has collected about 30 TBs of GIS data over the past 8 years, and I always find myself asking the following questions: What type of data do we have for a given geographic area? What are ...
12
votes
4answers
1k views

Open Street Map and PostgreSQL what do I exactly need?

I make my first steps in the GIS world and everything is very new for me even if I work on a "huge" project (ie: for a single programmer) very related to maps. My project needs to know informations ...
11
votes
4answers
15k views

ArcGIS fails to import all records from huge CSV file to file geodatabase table despite being within FGDB table size limits

I'm using ArcGIS 10.0 on Windows 7 64-bit with 4GB of RAM. I have some very large tables in CSV format to import to ArcGIS, they all have about 30 fields, upwards of 5 million records per table (a ...
11
votes
5answers
367 views

Why do most GIS packages need a numeric id?

This is a simple yet possibly controversial question: why do most (if not all) GIS packages require that a determined layer have a unique not nullable numeric identifier? Why there is the need for ...
11
votes
2answers
2k views

Future for geospatial on App Engine?

2 years ago, this question was posted here at Gillies's blog, on date of 2009-05-15. Future for geospatial on App Engine? At that time there was no news relating to any apps of GIS web services ...
10
votes
5answers
904 views

Database versus Files for Solo Developer

I'm just getting started in GIS and am interested in using it to create maps of mountain biking trails in my area and nearby. I've been learning QGIS and have made enough progress to generate a decent ...
10
votes
5answers
15k views

How to display special characters German “ÄÜÖß” in a map?

I have a shapefile with names for Regions. These don't seem to contain special characters but ugly hieroglyphs. What can I do do display them correctly. If I import the shape as UTF-8 it doesn't work.....
10
votes
3answers
875 views

How can I handle tables with 256+ variables?

I'm working with census data and downloaded several CSV files, each with with 600ish columns/variables. I'd like to store them all in a query-able database, but everything I've tried so far (MS ...
9
votes
8answers
11k views

Comprehensive database of all cities/towns in South Africa?

The title says it all really - I'm looking for a comprehensive list/database of all cities/towns in South Africa. I know about these guys: http://www.afrigis.co.za/, but they're just not getting back ...
9
votes
3answers
5k views

How to design a bus station query database schema?

We have bus station data, and we want to build an application which will provide the line/multiple line for a given start station and the end station. For example user try to get a bus line ...
9
votes
2answers
5k views

Converting ms-access database into easy to use spatial database

I've recently come into ownership of an MS-Access database (2007 accdb), which I want to be able to use in a GIS. I know a little bit about GIS (I've used QGIS and ArcGIS quite a bit) but very little ...
9
votes
3answers
5k views

How to fix “Unable to initialize ODBC connection to DSN for ALC_AV_CO”?

So I am new to the QGIS community, and I have been trying to bring in some rather large access databases with little to no success. I have windows 7, so I've gone in through administrative tools/Data ...
8
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3answers
3k views

Suggestion about the database to be used with OpenLayers

Can anyone suggest me which database to be used with OpenLayers? I have to store the values in a database table and retrieve them (trivial tasks). Which is better MySQL or PostGIS? Can anybody give ...
8
votes
2answers
808 views

Basics about Spatial Indexes

I was asking on a forum if it could be a good idea to create spatial indexes on subsets of a table when your application display on map only those subsets and never the entire table. I was asking ...
8
votes
2answers
6k views

QGIS supported databases?

Does anyone know if there is some kind of documentation on which database types that you can connect to in QGIS? I would also like to know if: Can I use the databes for read only or read & write. ...
8
votes
3answers
477 views

Efficient processing of difference between input data and database

I have an input dataset whose records will be appended to an existing database. Prior to being appended, the data will go through heavy, time-intensive processing. I want to filter out records from ...
8
votes
4answers
3k views

Geolocation database of beaches

Anyone know where or how to obtain a database of worldwide beaches? Required fields are: name latitude longitude coastline aspect (if possible) Alternatively, is there a way to query Google Maps to ...
8
votes
2answers
1k views

How can I find the median column in a database?

I have data on period of construction for dwellings in dissemination areas. I have transferred this data to my study areas and would like to determine the median period of construction for each study ...
8
votes
3answers
4k views

Adding a GIS feature to existing database entry with QGIS

I've built a database with postgreSQL with tables, which include geometry columns. When I add some data to my non-geometry columns, I can see them in QGIS when I connect to my database using postgis. ...
8
votes
3answers
1k views

What are the Pros and Cons of hstore data type in postgis?

PostgreSQL has a module named hstore that implement the use of key/value pairs (it's something like the OpenStreetMap model, but in a single table). What are the Pros and Cons of hstore regarding GIS ...
7
votes
3answers
4k views

How to create something similar to GDB in QGIS?

I used to work with ArcGIS. There I had geodatabases in which I could store several shapefiles with defined layer styles. Is there a way to do something similar with QGIS? The background is: we are ...
7
votes
3answers
13k views

Is there a way to link ArcGIS to MS Access and use that DB?

I have an IT background but I am new to GIS. I recently recieved training using ARCMAP. I have about 5000 farmers that I need to put in a database and access the information using GIS. The vision is ...
7
votes
2answers
8k views

ST_Transform doesn't work in PostgreSQL

When i run the query with ST_Tranform I get this error: Input geometry has unknown (0) SRID SQL state: XX000 How can I resolve this error? I want to convert from UTM into geographic lat/lon. ...
7
votes
1answer
7k views

Offline SLIPPY Map (Tiles) Database for Leaflet

How can create an offline cache of a large number of SLIPPY tile (PNG, 256x256) inside a web browser and then display them from that offline cache. For example, can one use HTML5 IndexedDB as an ...
7
votes
3answers
2k views

Suggestions for an efficient way to store raster files for lab use?

I'm trying to create a repository for our raster files from various sources and Im exploring the possibilities on how to store them and deliver them in our local intranet. I have come across rasdaman ...
7
votes
1answer
1k views

Spatial index vs two coordinates indexes

I have a table with two columns: latitude and longitude. I want to get all objects inside a "rectangular" (well, rectangular in a lat/lon coordinate metric) bounding box: min-max latitude and min-max ...
7
votes
1answer
2k views

Why is my XY Event Source layer only displaying at full extent?

My XY Event Source layer is only displaying at full extent and when I zoom in, the features disappear. If I select a feature in the attribute table, the feature is highlighted. When I see this for a ...
7
votes
1answer
1k views

Imagery Database/Metadata Store

I'm a Remote Sensing PhD student, and as such I have a large number of satellite images that I'm working with. I'm starting to fail to keep track of them all and I have a lot of metadata that I want ...
7
votes
2answers
804 views

Using QField with Multi-User Access also Offline?

I got 10-20 QGIS-Users which edit all one Project online and offline. Sometimes they do it at the same time. Until now we only used QGisDesktop with a PostGis Database stored in QGIS Cloud(50MB ...
6
votes
2answers
3k views

How to load a data table as a 'vector layer' using PyQGIS?

This might be a simple problem, but how does one load a simple two column CSV with no associated geometric data? I have given a couple go's via QgsVectorlayer[delimited text, spatialite] types - but ...
6
votes
3answers
26k views

Import info from mdb file into a project?

I need to import info on a QGIS project. The info are in a MDB file (population, mean age, number of cars and so on: one record per region) that is written to be connected with a region shape from an ...
6
votes
1answer
1k views

Data visualization and maintenance tool

Background Looking to leverage an existing GIS system for exploring organizational data. Architecture The following figure represents a high-level overview of the system's desired features: The ...
6
votes
1answer
991 views

Need Advice - Displaying very large amounts of data on Leaflet js from database

I'm researching the best way to display a very large weather dataset (850mb +/-) for folks to use on their mobile and desktop devices. This huge dataset (1 point every 12km across the USA) that I'd ...
6
votes
2answers
2k views

GIS Database Migration Project (Oracle to ArcGIS)

I have been tasked with converting an Oracle Database into an ESRI file geodatabase. The data represents a gas network. The client's Oracle database has over 400 tables, 120 of which are spatial. I'...
6
votes
3answers
39k views

How to embed a map into Access Database?

I am developing a database for my organisation that could be spatially enabled. I have to use MS Access 2007 on Windows and am therefore looking for any possibilities to incorporate my Access ...
6
votes
3answers
10k views

How to read the GEOMETRY table inside a sqlite database

I'm working on an android app which should display some lineobjects stored in a sqlite database. This sqlite database is created through an export in QuantumGIS. My first question is it a real ...
5
votes
2answers
2k views

Data organization strategies for .csv and .shp

I'm organizing a large amount of data for a project and the data is stored in .csv format, with a code to relate each row to a polygon in a .shp. I was planning on converting the .csv data into .dbf ...
5
votes
1answer
11k views

Establishing a MySQL connection in ArcGIS 10

Is it possible to create a connection to a MySQL database in ArcGIS 10?