Questions tagged [database-design]

Database design is the process of specifying the logical and/or physical parts of a database.

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62 views

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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0answers
326 views

Postgis : Geometry vs 3 geom columns in single table

Requirement: There a specific requirements where I need a geometry column in table to be flexible ( It can line or point or polygon or all of it ) Justification for requirements : main concern is ...
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3answers
823 views

Can primary keys and foreign keys be used in versioned geodatabases?

I've been brushing up on relational database design theory, and I keep coming across primary keys (PKs) and foreign keys (FKs). PKs and FKs are said to be pillars of relational database design and ...
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Database Table in SQL Server

I have an excel table. I created a database table in SQL Server database platform in ArcMap. I added fields, fields' data type, and domains to some data fields (columns). When I open the table, all I ...
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2answers
900 views

How do partition tables improve query performance in PostGIS? [closed]

I have static road, country and state datasets in my PostGIS database. Road networks are partitioned by their containing country. Countries, States and other areas reside in their own table and are ...
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0answers
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GIS Workorder System [closed]

First off, these questions are relevant: https://dba.stackexchange.com/questions/7900/pros-and-cons-of-having-one-table-per-entity-vs-having-a-shared-table-with-an-e/7907#7907 https://dba....
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1answer
202 views

Cloud based database solution [closed]

I'm looking for a cloud based database solution where I can store about 1 GB worth of tabular data and both myself and my client can access to perform SQL queries. I'm looking for this database to ...
7
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1answer
340 views

GeoJson structure

I currently designing a table/document database structure and use GeoJson to store points and routes. Currently I choose MongoDb, I will consider PostGIS later. I want to store route info for public ...
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1answer
2k views

Adding a column of WKT format in the table (postgreSQL)

I want to include this column of data that are in WKT format (they are mostly straight lines). What data type should I use? I need to create this database for mapping. There are about 30000 features ...
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2answers
1k views

How are section of roads uniquely identified (in both directions) by Google Maps?

I am wondering whether roads around the world are uniquely identified by a certain value in Google Maps? If so, are they mapped uniquely in terms of their direction? i.e is route A to B is identified ...
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2answers
173 views

Seeking web service that returns elevation profile between two points and can process 5000 requests per second

I need a web service that provides elevation profile data between two coordinates with request rates at a minimum of 2000 requests per second but preferably at 5000 per second. The distance between ...
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1answer
97 views

Creating spatial database with many categories that have same set of values?

I am working on creating a spatial database of county agricultural data where each county has multiple crops (30+) and for every crop there are several production metrics (yield, harvested area, ...
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4answers
2k views

How to model a graveyard - one point per deceased or one per grave? [closed]

This is a continuation of my previous question about our project on how to economically get away with the implementaion of a graveyard in a GIS system… On the graveyard we can find Regular ...
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1answer
279 views

Spatial+Temporal database request for 4D intersection

Here is the function I need to implement. My application deals with mobile objects with variable position and range (think of radar range). As I can't test each minute if n mobiles detect each other (...
3
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1answer
1k views

How to build a relational database system with 4 tables in arcgis desktop?

I have been given data from an working online application which consists of a relational model. My aim is to recreate the model using Arcgis Desktop. I have the table "elements" containing Point ...
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1answer
86 views

Strategies for managing (and ultimately merging) duplicate business locations in a spatial database

I am working on a project right now that involves using multiple (very large) "location directories" to identify with the highest possible inclusiveness, a diverse set of business locations. These ...
7
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3answers
600 views

Roadmap to creating a GIS? [closed]

Got asked that today in a job interview, I replied with the usual : Gather Data : what data do we want, do we possess it ? If not how to do we acquire it, etc. Database : after we have successfully ...
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1answer
439 views

QGIS Value Map Edit Widget with properties dependent on another field

I'm having a problems with Edit Widgets in QGIS. I'm working on a GIS Database for archaeological data, where every site is represented by a polygon. In the attributes there is a field for the era ...
3
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2answers
284 views

Traversing a PostGIS table tree

I'm developing a geospatial db for a company that operates at a number of large facilities. Its primary purpose is to help staff locate themselves and equipment within each facilities' multi-storey ...
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2answers
433 views

Setting up foundational OSGeo enterprise GIS? [closed]

First let me describe the task: My lab has approached me about setting up a simple GIS for a colleagues 'non-spatial' lab. There are a couple of key characteristics to the intended setup: Fully open ...
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2answers
230 views

Is adding a new table for every layer a good design idea?

Is it a good design idea to maintain separate tables for each layer in a PostGIS database?. Every layer is defined by users. A user creates his/her layer say ATM location. That's meant by defined by ...
6
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2answers
967 views

Should I use ISO 3166-1 Numeric codes as Primary Keys for Countries in a database table?

My main concern is, will one country ever adopt a numeric code that has been used for another in the past, such as can happen with alphanumeric 3166-1 codes? If not, then it seems like a perfect ...
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2answers
151 views

creating one tree to many observations in qgis

Looking to create a database for QGIS where each point represents a tree (with name attribute) and another table of observations about each tree over time. Ideally I can update tree location in QGIS ...
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2answers
6k views

How to design a database for continents, countries, regions, cities and POIs?

I'm brand new to GIS programming and I am designing a GIS application. Target is to create system with continents, countries, regions (including states, sub-regions, provinces), cities and places in ...
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4answers
4k views

Creating unique IDs for file geodatabase using ArcGIS for Desktop?

I use ArcEditor licence level, ArcGIS 10.0 version, and we're talking about a file geodatabase. I have several feature classes (electric energy domain) and I want to connect them using relationship ...
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2answers
895 views

What's a good way store borehole data in SQLite / SpatiaLite?

I have a bunch of bores / wells with downhole data. The 'header' info for each borehole can easily go into a single table, but I'm wondering how best to store the downhole log data. Typically they are ...
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2answers
2k views

Is there a way to have a single point feature with multiple records?

Is there a way to have a single point feature and have multiple attributes records associated with it? Multipoint approach won't work as it gives me one attribute set (database row). I am trying to ...
2
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1answer
183 views

Attributes that characterize a geodetic track

I need a way to index and retrieve a large amount of track data. To do this I need to derive from every track as many attributes as I can. For now, I derive Name Tortuosity Speed (average, max) ...
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1answer
2k views

Importing/copying geodatabase schema from multiple tables to single table?

I have an existing ArcGIS 10 geodatabase which has a complicated schema containing multiple tables and joins, and I wish to simplify this for faster web delivery. For example, Featureclass1 is ...
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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 ...
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4answers
638 views

Record Date and User for an edited feature

The client has a Feature Class in SDE 9.3.1. When a feature in the feature class is edited the client wants to automatically record the date/time and who edited it in the feature class attributes. ...
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2answers
1k views

Sharding of geospatial data

Reading through Rosenberg & Mateos' The Cloud at Your Service I stumbled upon the concept of database sharding. Authors point out to several advantages of such approach including high (online) ...
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2answers
2k views

Designing Spatial Database for temporal Data? [closed]

I am working on a Weather based GIS App. I have the data from several weather stations, and this data will updated daily (by a web service). The obstacles I am facing are: There are currently 40 ...
11
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1answer
685 views

Is it possible to maintain primary keys on versioned featureclasses without arcobjects code?

Since it is not a good idea to use ObjectIDs as primary keys in relationships, some other column will need to be used. Is it possible to use DBMS sequences to populate primary key columns in ...
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2answers
2k views

When is it safe to use ObjectIDs as keys in a relationship class?

I've always avoided using ObjectIDs when defining relationship classes. It is my understanding that some actions on a geodatabase will re-set objectIDs (like import/export). However I do see a lot ...
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5answers
2k views

Is good database design less important for spatial databases?

I have a strong feeling that database design and normalisation often comes in second hand when dealing with spatial data. With software costing a fortune and databases with over 100 fields tables I ...