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Coordinate Reference Systems

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I am wondering about WGS84 as we move through time.   My understanding is that any given spot on the earth's surface latitude and longitude will change over time in this system. There are two sources of change:   1) NGA (National Geospatial-Intelligence Agency) will periodically shift the center of the WGS84 ellipsoid to better align with their… (Show more)
While fine-tuning a technical workshop for next week, my co-presenter and I realized that our comment of "don't forget these knowledge base articles!" (see terminology note below) wasn't very helpful. You used to be able to go to and type in a knowledge base/technical article number like 23025. That would bring up "FAQ:… (Show more)
in Coordinate Reference Systems

. I have an issue. We have polygons in Arcmap that are in NAD 83….we convert them to Nad 27 4203 and send to Petra…..but once in Petra they are always s off by at least 100Ft. Any ideas?

Hello everybody,   I'm doing the conversion from Raster with tiff format (with GDM_2000_MRSO Spatial reference) to polygon shapefile. I want to set the new shapefile with WGS84 for spatial reference. The problem is, the new shapefile with WGS84 not match with imagery basemap (esri basemap) or others basemap with spatial reference wgs84.   can… (Show more)
in Coordinate Reference Systems
I have few thousand rasters in AK zone 4 state plane on NAD83 and in UTM5/6  on GRS 80 that I am trying to mosaic into Web Mercator. Arc is reporting that I need a transformation but I do not see an esri transformation for it. I understand that the ellipsoids are almost the same. NOAA/NOS's VDatum: A tutorial on datums    What is the… (Show more)
in Coordinate Reference Systems
The projection "MAGNA_Bogota_DC_2005" has the following parameters: False_Easting: 92334.879 False_Northing: 109320.965 Longitude_Of_Center: -74.14659166666668 Latitude_Of_Center: 4.680486111111112 Height: 2550.0 Linear Unit: Meter (1.0)   However, the projection library proj.4 does not support a height parameter as input,  rather the more… (Show more)
in Coordinate Reference Systems
Hello,   I am using ArcMap 10.4.1.   I need to import a coordinate.  I have ArcMap coordinates set to geographic->World->WGS 1984 (I assume this coordinate system is a true Geographic 3D type that is not projected).  The coordinate that I am importing is in latitude-longitude format.  Do I have to adjust any settings to tell ArcMap that the… (Show more)
in Coordinate Reference Systems
I am embarking on a new project that is located in Finland and the data in the project folder are projected in Finnish KKJ_Zone 4 [EPSG2394]. The Arc dropdown box lists two projections for Finland under Projected Coordinate Systems/National Grids: KKJ Finland Zone 0 and KKJ Finland Zone 5 (but no Zone 4). Is there a simple way to add KKJ Finland… (Show more)
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