The Datum and Grid on Curacao was established in 1951 and uses a local Transverse Mercator. The origin of the datum is "DP 8" ("Dienst Punt 8" or Survey Point 8). The stuff I have there for WGS84 datum shifts looks really, really good. (sub-centimeter accuracy) by: Cliff Mugnier cjmce@jazz.ucc.uno.edu 15 Sep 1998 _________________________________________________________________________ The Datum and Grid on Curacao was established in 1951 and uses a local Transverse Mercator.

Projection: Albers Equal-Area with Central Meridian = -96.0, Reference Latitude = +37.5, Standard Parallel 1 = +29.5, and Standard Parallel 2 = +45.5.

Datum-A set of parameters and control points used to accurately define the three dimensional shape of the earth [eg. as a spheroid]. The datum is the basis of planar co-ordinate system. For eg. the North American Datum for 1983 (NAD83) is the datum for map projections and coordinates within the united states and throughout North America Map Projection-A device for representing all or part of a rounded surface on a flat sheet.

There is no projection. The coordinates systems is geographic. To keep the dataset consistent the geographic coordinate system can be used across the dataset. Once the data is received it can be reprojected into UTM zones. This conversion to software dependent. The horizontal datum for all areas, except Alaska, is NAD83. Alaska is NAD27. The vertical datum for all areas, except Alaska, is NAVD88. Alaska is NAVD29.

No. To maintain consistency the data is only produced in NAD83 and a geographic projection. It would be up to the software being used to reproject into UTM zones or a different datum.

datum - any quantity or set of such quantities that may serve as a referent or basis for calculation of other quantities. geodetic datum - a set of constants specifying the coordinate system used for geodetic control, i.e. for calculating coordinates of points on the Earth. least eight constants are needed to form a complete datum: 3 to specify the location of the origin, 3 to specify the orientation of the coordinate system and two to specify the dimensions of the reference ellipsoid.

Being comfortable with and working effectively with these concepts is essential to avoid bogus analyses, incorrect data summaries, corrupted data, and confusion. Phil Hurvitz has created this Projection/Coordinate System/Datum Exercise to test or build your knowledge of these concepts.

C-CAP data, provided on the Web, are distributed in Universal Transverse Mercator (UTM), North American Datum 1983 (NAD83), meters. The reason for the use of a Mercator-based projection is that raster data are not well represented in Geographic Latitude/Longitude (GLL) projection. GLL is a non-Cartesian coordinate system, meaning that the pixel size will change over space, becoming more extreme as you approach the poles.

The projection and datum of St.Lucia, West Indies: The current classical geodetic datum for your country is "DOS 3 Lighthouse 1955" established by the Directorate of Overseas Surveys. (They are now part of the Ordnance Survey of Great Britain.) I do not have the coordinates of the origin or the azimuth of orientation, but the ellipsoid is the "Clarke 1880, (Modified)" where a = 6,378,249.145 meters, 1/f = 293.465.

In regard to sunny Yemen, there are a number of datums found there. The Aden Datum of 1925 uses the Aden Lambert Zone (Clarke 1880). The Sanaa Datum uses the Yemen Azimuthal Equidistant Grid System (International), and datums with unknown grids exist as: Kamaran Datum of 1926-27, Ras Karma Datum, Socotra, Socotra Datum of 1957, and Socotra Datum of 1964-65.

The Puerto Rico Datum of 1901 is based on its origin at Cardona Island Lighthouse with a defining azimuth to Ponce Southwest Base. The Datum is referenced to the same ellipsoid as NAD 1927 which is the Clarke 1866. The island is now on the NAD83, and the Grid parameters have changed slightly. Information on ALL of the LEGAL Grid Systems of the United States, its Possessions and its Territories are available free from the U.S. National Geodetic Survey. Try ( http://www.ngs.noaa.gov ).

Geodetic datums define the size and shape of the earth and the origin and orientation of the coordinate systems used to map the earth. Please, request SymbianWare if you need some additional datums or projections. We may include new datums or projections in future versions.

A projected coordinate system is the result of the application to a geographic coordinate system of a coordinate transformation using a projection method and a set of parameters specific to that method.

A datum is a ???base level??? or ???reference value??? from which other values can be calculated. A position on a map or chart is referenced to an imaginary plane surface (the horizontal datum) so that all positions taken from the chart are consistent and accurate. The horizontal datum for all boating safety charts is GDA94 (compatible with WGS84). GDA94 stands for Geocentric Datum (of) Australia as established in 1994 and WGS84 stands for World Geodetic System as established in 1984.

GIS data projections are the method that cartographers use to represent our 3 dimensional world on a 2 dimensional flat map. There are many different projections to choose from, because each one tends to distort shape, area, direction, or distances in different ways and by different amounts. Which one you use depends on your purpose. For a more detailed discussion of the projections in general, see the Wikipedia article: Map Projections (EXTERNAL LINK).

Datum is like frame of reference. Each point at earth surface is defined as combination of latitude, longitude and elevation. But all the three values depend on origing of coordinates, direction of axes, and accuracy of measured Earth radius and polar flattening. Different datums are used in different countries. As a result, coordinates of the same point may differ in two datums. For instance, Russian maps are based on "Pulkovo-1942" datum. The one used in GPS is WGS84.

OmniSTAR VBS in North America is on the NAD83 datum and ITRF00 in all other OmniSTAR world areas. OmniSTAR HP and XP are in ITRF00, worldwide. Some GPS receivers have the capability to convert and output the Position Data in various datums. This is a choice made by Receiver Manufacturers. Check for this option and your receiver settings to be sure. The reason for keeping the VBS in NAD83 in North America, is somewhat complex.

In the context of elevations, a Datum is a reference system that is used to compare elevations of various places to a certain height. Commonly associated with the concept of local mean sea level, the current system of elevations in North American is called the North American Vertical Datum of 1988.

A map datum is a reference surface which is defined mathematically and approximates the shape of the earth in particular areas. At different areas across the world, different map datums were (and some still are) used due to the differences in the earth's general surface shape at different places. Specific map datums are more applicable to particular areas or regions than others.

The first is something called a "datum". In simple terms, this is the "model" used to represent the shape of the earth. This is necessary, because the earth is not really round. WGS-84 is an example of a map datum. Other common datums in use are NAD27 and NAD83. We use WGS-84 here, because the Global Positioning System itself uses it. By the way, your GPS probably also defaults to this datum, so you shouldn't need to change it.

Chart Datum is the plane below which all depths are published on a navigational chart. It is also the plane to which all tidal heights are referred, so by adding the tidal height to the charted depth, the true depth of water is determined. By international agreement Chart Datum is defined as a level so low that the tide will not frequently fall below it. In the United Kingdom, this level is normally approximately the level of Lowest Astronomical Tide.

Lauri is simply one of the most wonderful and funny women on this planet. Simply put, I adore her. And her husband, Benji, is pretty great too. I keep mentioning her because I really want to spread the Lauri around (as long as I reserve large portions for myself). And I really want her to get a blog so I can link to her and you can go there and see for yourself that I am not crazy. As a secondary measure I am thinking about making a blog for her and posting her emails to me as her entries.

Yes, CAREWare 4.1 is totally free under our End User License Agreement (EULA). Not only is the software free, but we also provide free technical support and software upgrades for 4.1.

Please be sure to check out other useful CAREWare 4.1 resources that are also available on the web site.

Volkswagen also announced a voluntary recall to inspect the routing of a wire for the Tire Pressure Monitoring System (TPMS) on its 2004 Touareg model. Only about 620 cars are affected by this action in the U.S.

To learn more about the value of fruit jars I recommend the Red Book of Fruit Jars #9 by Doug Leybourne. You can order the book post paid for $35 from the author by writing him at P.O. Box 5417, N. Muskegon, MI 49445. You can also purchase the book on-line at www.fruitjars.com

A#4.1: Lots of free utilities that bring some of the power of UNIX systems to the IIGS. In addition to getting the utility executable files, you get the source for many of these. These programs have been provided by various authors.