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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7
votes
6answers
2k views

I'm looking for a 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 ...
3
votes
1answer
1k views

Casting a Geography type in PostGIS

I have the following table defined, which uses PostGIS geography. CREATE TABLE test_geog ( id SERIAL PRIMARY KEY, boundary GEOGRAPHY(Polygon) ); I added the following test polygon to the ...
10
votes
4answers
772 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 ...
2
votes
2answers
456 views

Create a dbf table by copying the structure of another dbf table

I have a dbf table and I wish to automatically create another dbf table with a different name but with exactly the same structure i.e.fields as the existing table. Is there any ready code in VBA and ...
3
votes
1answer
126 views

Choosing a GIS which imports a list of stage addresses, calculates the route, allows to modify and export it

I'm new to GISs. I'm searching for a GIS to meet following requirements. I have a list of street addresses [A,B,C,D,E,...], with additional information associated (basically which orders to deliver ...
2
votes
1answer
184 views

Database View in Oracle 9i with SDE 9.3.1

If I have a sql statement creating a view against ArcSDE 9.3.1 on Oracle 9i, is the best practice to create the view in ArcCatalog just creating the name (kind of shell of the view) then going in to ...
35
votes
3answers
6k 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 ...
18
votes
7answers
1k views

Spatial databases learning resources for newbies

Would be taking up a course on spatial databases next semester. Would anybody know a newbie friendly introductory resource? A vendor neutral one would be preferable. Thanks.
1
vote
0answers
93 views

Getting started with storing LoST and GML searching

I am working on a logging and search database application. The application will receive event records containing XML LoST values (RFC5222 Location-To-Service-Translation). These records will be ...
3
votes
2answers
624 views

Table structure for a reverse geocoding database

I should start by saying that I do not have much experience with GIS so this question may be foolish. What I do have is a database for performing a lookup from a set of coordinates to find the ...
2
votes
2answers
627 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?
7
votes
3answers
1k 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 DB table and retrieve them (trivial tasks). which is better MySQL or PostGIS? Can anybody give benefits ...
3
votes
1answer
402 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) ...
4
votes
3answers
348 views

Looking for good resources for batch files in relation to databases/geodatabases

I hesitated a bit before asking this, as it isn't necessarily a GIS specific question, though I'm using it to update geodatabases. I have found plenty of hits on a Google search, but frankly, many of ...
4
votes
3answers
1k views

Delete a feature data set in SDE 10 programmatically

Is there a way to delete a feature data set and all of its feature classes programmatically either by using custom code or pre-existing command line tools? There is a tool provided by SDE called ...
2
votes
1answer
208 views

Are there any efficient methods for processing ArcGIS-based database tables outside of the ArcEtc program library?

Let us say, for the sake of argument, that you are working with a table that is over 2 GB in size (so .dbf is automatically ruled out... right?). To even create such a document, ArcGIS requires that ...
8
votes
2answers
634 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 ...
2
votes
1answer
332 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" ...
9
votes
2answers
864 views

How to design a Spatial Database for temporal Data?

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 ...
1
vote
2answers
728 views

Apply Database based Rules to Openlayers

im trying to apply rules, where the data is fetched from an external database. This is my code: // create a new style and add rules var defStyle = new OpenLayers.Style({ ...
10
votes
3answers
8k views

What is the difference between FID and OID

What is the main difference between OID and FID in ESRI software?
13
votes
10answers
14k views

Where can I obtain an up-to-date list of US ZIP Codes with Latitude and Longitude Geocodes?

NOTE: This began as a question on Stack Overflow, which has subsequently been closed. I also noticed a similar question about Most Up-To-Date Source for US Zip Code Boundaries, but I believe this ...
8
votes
2answers
818 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 ...
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 ...
4
votes
2answers
196 views

Using a web map to identify and access data

I am trying to making a webpage where the user pans and zooms on a map, and based on the location and zoom level, some data is displayed on the webpage (drawn from another source). The data that will ...
7
votes
1answer
1k 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 ...
6
votes
2answers
613 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 ...
11
votes
3answers
1k views

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

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 ...
52
votes
8answers
3k views

How do I get started with PostGis

I have been reading a lot about it, but I am struggling to find a good beginner's guide. Which tutorials/books do you recommend? My past experience involves python and arcgis. But I have never worked ...
1
vote
2answers
676 views

osm2pgrouting connection failed

I'm importing data from my OSM file to a postgresql database using osm2pgrouting. I followed everything in from here and it went smoothly, until I try using osm2pgrouting. This is what happens: ...
1
vote
5answers
986 views

Store Geometry in a database with the ESRI Silverlight API

Is it possible to store geometry objects in a database using the ESRI Silverlight API? For this particular case, the client may have SQL Server 2005 installed instead of 2008 and therefore I can not ...
19
votes
8answers
6k views

What are the best databases for storing spatial data? Pros and Cons

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 ...
23
votes
9answers
4k 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 ...