Hot answers tagged standards
The INSPIRE data specifications define some standard styles for portrayal of topographic data (transport network, hydrography, administrative units, etc.). See for example the section "11.Portrayal" of this document for hydrography. If you are looking for standards for the representation of style, see SLD and GSS.
If you use that id for something like as a foreign key in relation to another table your whole database will get in big trouble if you have to move a point for some reason. Probably you then will have to keep the id even if it not describes the xy-coordinates any more. As a unique key is often the best to have something not telling anything about the data, ...
The closest I've found to an answer is in the DMA technical manual 8358.1, which states: 3-2.2.1 For that portion of the world where the UTM grid is specified (80° south to 84° north), the UTM grid zone number is the first element of a Military Grid reference. This number sets the zone longitude limits. Zone 32 has been widened to 9° (at the ...
Well known text for geometry is defined in OGC 01-103r4 (amongst other places). Section 7 of that document provides the syntax. There is also a list of SQL functions relating to those in Part 2 of the Simple Features spec (also an OGC product). The ISO documents are just a more expensive way to get much the same thing. There are useful extensions such as ...
Ian's answer is incorrect. WGS84 approximates Earth by an elipsoid, which is basically a deformed sphere. EGM96 is a more complex model based on the gravitational force of the Earth (which is not constant) that defines what "sea level" or "up/down" mean, a smooth but irregular shape called "geoid". WGS84 is the elipsoid that best fits that geoid, and this ...
Desktop GIS Opensource: udig, QGIS (Releases currently only supports WFS, developer version contains experimental WFS-T support check the QGIS bug tracker.) Commercial: Mapinfo Professional Web GIS Opensource: OpenLayers, Mapbuilder & Mapbender Commercial: Internet Mapping Framework (IMF) Most information taken from geoserver.org.
If it is for using and editing in a gis system i would stick to shapefiles. This format is well supported by all GIS software.
There's some information on the OGC Call for Comments page on the new specification for coordinate reference system WKT standard. The original specification was written by Esri many moons ago for OGC based on the mid-1990s version of the EPSG Geodetic Parameter Dataset's schema. It was revised and extended by other OGC specifications. Because it was a very ...
This convention is just begging to bring out bugs from bad command interpreters. (It is all too easy to confuse initial digits with a number.) Your software's success today in avoiding such bugs is no guarantee that they won't appear in future releases. This has happened multiple times, over decades, with ESRI's GIS software. This behavior has been ...
I emailed USGS and got this response: Greetings Jaime: zone 32 is 9 degrees wide in zone designator V is 9 degrees wide for the purpose of including the west coast of Norway within a single zone. Zones 33 and 35 are 12 degrees wide in zone designator X for the purpose of putting Svalbard into two zones instead of three. In both examples, the UTM ...
I recently noticed this project by the GeoVista group that is attempting to standardize map symbology for critical incidents (sponsored by the Department of Homeland Security). They have a few conference papers that should be helpful for standardized emergency symbols. Note this also is not an international standard, but I would check out the references for ...
Avoid Numbers if you can - Earth Sciences has a good example http://library.oceanteacher.org/OTMediawiki/index.php/General_File-Naming_Convention_for_Earth_Science_Datasets#Filename_Sections_in_the_Order_They_Should_Appear Spaces can trip you up to - some old DOS based commands for moving files break if space are involved - use "_" (underscores) is a wise ...
The closest thing that I'm aware of is the ESRI GIS dictionary, though of course it's tied to a proprietary software package and company. It's pretty comprehensive though: http://support.esri.com/en/knowledgebase/Gisdictionary/browse an open community version would be excellent though, something like a wiki (could be a good offshoot of this forum!) Tom
You should also consider ESRI's recently released (Sept 2010) Geoservices REST Specification
Here are some additional links: Spatial Information Clearinghouse Wiki GIS Glossary
Depending on your level of accuracy I would suggest the following: Low level Accuracy Use QGIS for Android (free and has a gps toolbar) along with your tablet or handheld native gps High Level Accuracy Use QGIS for Android along with your vendor gps
Follow up question: Is it best to create and maintain the unique id in the DBMS (SQL Server) or in the GIS software (ArcGIS)? I'd strongly suggest checking for uniqueness inside the DBMS. That's one of the many strengths of DBMSs. It also allows you to access your data with different GIS software that probably wouldn't be aware of the unique constraints.
Adding on from Nicklas answer and my comment. I would say the most used convention and most recommended is just to use a auto-incrementing ID, eg start at 1 and just keep going. No logic and simple. If you have a distributed system, or don't like auto-incrementing numbers, you could use a GUID. Most databases will handle creating this kind of ID for you. ...
On a comical stance... http://www.cartotalk.com/lofiversion/index.php?t2542.html 'emergency symbol library' links to the map.. Homeland Security Mapping Standard - Point Symbology for Emergency Management http://www.fgdc.gov/HSWG/index.html Tip: Try an guess the symbols
I am not sure you can get a true consensus on all terminology. For instance: ESRI Node = point or vertex Autodesk Node = grip point Microstation Node = text insert ESRI Arc = line Autodesk Arc = semicircle Not that it wouldn't be nice if they could concede and all agree to a standard. And I do see some backing away from "OLD HAT" positions of "that is ...
The referenced paper is overly fussy, IMHO, because there are some preliminary questions to address. Chief among these is that the NSSDA implicitly models errors as approximately normally distributed and independent. Both of these assumptions are questionable, especially the second, and ought to be checked first. Their effects will be much stronger than ...
These might be some good contact/reference points. Opensource routing, It looks as though they spun their own. Very cool with walking and biking routing as well as driving! Opensource geocoding reviewed - This from March 2010.
Any "Open" or "Select" file dialog is going to do sorting assuming the files are named using letters. So if you are using an eight (!) digit unique number for every project file sorting will quickly become illogical. E.g. 1 10 2 20 3 etc. Besides there'll be plenty of GIS tools that will still be assuming files that conform to the MS DOS 8.3 filename ...
I had no idea it moved either! http://en.wikipedia.org/wiki/Arctic_Circle The position of the Arctic Circle is not fixed, but directly depends on the Earth's axial tilt, which fluctuates within a margin of 2° over a 40,000 year period, notably due to tidal forces resulting from the orbit of the Moon. The Arctic Circle is currently ...
Our identification scheme was not chosen by me but is as follows: 2,3,4 character code which is the class of asset and a 6-digit sequential number (you would choose whatever digit count works for you). A stored procedure creates these IDs and relies on a couple of non-geodatabase tables in the same SQL Server database. I do keep a separate, sequential ...
I found an article about the history of grids and datums in Norway. I do not understand many of the details in the article, but it seems like 32V was extended for compatibility with previous grids. The article does not offer a clear explanation about Svalbard. : Mugnier, C. I. Grids and Datums: The Kingdom of Norway. Photogrammetric Engineering and ...
In the ESRI world, WFS-T is supported starting with version 9.3 in ArcGIS Desktop for visualization of WFS only and ArcGIS Server for publishing and edition through a WFS-T client.
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