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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23
votes
2answers
3k 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 ...
10
votes
5answers
17k views

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

I have a shapefile with names for Regions. These don't seem to contain special characters "Ä", "Ü", "Ö", "ß" but ugly hieroglyphs. What can I do to display them correctly. If I import the shape as ...
1
vote
1answer
1k views

Flatten / collapse one-to-many table and keep the 'many' attributes separate

I have a data set that contains intersection data. Each intersection node has up to 6 links which is identified by IN_LINK and OUT_LINK attributes. I want to create a new dataset that includes the ...
8
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 ...
27
votes
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 ...
13
votes
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 ...
10
votes
5answers
996 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 ...
4
votes
1answer
1k views

Pulling CSV file directly from website into QGIS?

I want to be able to automatically update my csv files in a QGIS project. My organization has an online database that can easily export csv files. These csv files are constantly updated with new ...
14
votes
3answers
5k 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?
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?
25
votes
3answers
33k 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 ...
7
votes
1answer
8k 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 ...
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 ...
16
votes
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 ...
11
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. ...
9
votes
2answers
939 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 ...
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 ...
6
votes
3answers
43k 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 ...
5
votes
1answer
2k views

is there any direct access to Mapbox data? (similar to CartoDB's sql api)

I've been asked to add a form to a map that will write data in the background (e.g., ajax to a magic file that does datawrites and some emailing, notifications etc) and a new marker will be added to ...
6
votes
1answer
682 views

PyQGIS - Adding layer from PostGis database [duplicate]

I want to add new layer from PostGIS database but this code isn't working... Can someone help me? uri = QgsDataSourceURI() uri.setConnection("IP address", "5432", "ruian", "user", "pass", ...
6
votes
3answers
27k 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 ...
5
votes
1answer
2k views

How many kinds of “address” are there? [closed]

I'm defining "address" as "a physical location, usually visibly numbered". Numbered was used in the definition to exclude purely geographical features not usually considered to have or need an ...
2
votes
1answer
990 views

Linking Google sheet as a database for GIS [closed]

I’m working on a database update, at the moment this database is simply an excel spreadsheet not formatted to be used in a GIS project. The database has to be updated and modified over time. Some ...
2
votes
1answer
2k views

Using ArcPy to get all database names within server?

I am trying to populate a folder with ArcSDE database connection files for all the databases within a server instance. I need to be able to do this for several of our servers. Although I know within ...
8
votes
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 ...
5
votes
1answer
580 views

PostGis and datatypes WKT

I dont't have any experience with the geographics databases so I hope that you be patiente with me, the thing is: I know that the datatype geography is used if all you care about is measuring ...
5
votes
2answers
3k views

Converting Date field to string using ArcGIS for Desktop?

I'm working with two data sets that require a compound key to join or relate. The two fields are: 'Node_ID' which is a long integer field referring to a particular electrical substation [887932] '...
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 ...
3
votes
2answers
10k views

BLOB TYPE in Arcmap

I created an excel spreadsheet which converted to blob type when i imported it into ArcMap .I am trying to view the BLOB type field in ArcMap because I want to join this blob field to a common field ...
3
votes
1answer
1k views

Schema locking logistics on ArcSDE for SQL Server?

I have a set of feature classes that I want to be able to edit schema or what ever I want to do in the heat of the battle and I don't want to be stiffled by schema locks. I have a interpretable ...
3
votes
1answer
2k views

Filemaker interface with QGIS

I have created a map of features on an archaeological site. The artifact inventory is in FileMaker Pro 12. Rather than creating a CSV file and using that as the attribute table, I would rather, if ...
2
votes
3answers
2k views

Extracting data from GeoMedia *.mdf database without using GeoMedia?

Is it possible to extract data from Geomedia .mdf without Geomedia? Preferably with use of QGIS or ArcGIS for Desktop?
2
votes
1answer
2k views

WFS & Feature Access -> Database connection / Database support (ArcGIS 10.2)

Over the last two days I've tried to set up and to use a postgreSQL database to use WFS and Feature Access. I've also started a thread in the esri forums, but I hope that I can reach a wider audience ...
2
votes
1answer
133 views

Postgis convert long lat from 2 different locations into line and calculate the distance in meters

The name of my table is odk_duct.duct_monitoring1_core and the select statement below is what i want to see the distance. The table has 2 longitudes and 2 latitudes. select "_URI" as id, "...
2
votes
1answer
394 views

stratigraphic ranking with field calculator?

I would like to populate a feature class float attribute with a numerical ranking of a text attribute of a geologic map. I have a field named [sheet_unit] with strings such as "H10, Q" and "J10, Pl" ...
2
votes
0answers
912 views

Connect QGIS to MSSQL view (i.e. not a table)

I've got a MSSQL view containing data I want to show in QGIS. The view transforms a BLOB field containing WKB that is in one of my tables into a SQL geometry, which QGIS will be able to display. ...
1
vote
1answer
2k views

How to insert data into postgis database table?

I am a newbie in spatial database, so I am having lots of issues even in small tasks and now I am having some issue with inserting data to the table. I have followed the postgis documentation but ...
1
vote
0answers
621 views

Why is MapServer returning a blank image? [closed]

I am trying to load a layer from a postgis database, MapServer does not return anything. I think I have narrowed the problem down to the fact that the SQL query MapServer is running is returning ...
0
votes
0answers
167 views

Many to many relationship in a QGIS Geopackage - fail

The current user manual has been unsuccessful in directing me to establish a many to many db relationship in a geopackage in QGIS (3.10.2 on Ubuntu w gdal 2x). After the airlines in the manual ...