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gjwyatt
My map is in NAD1983 UTM Zone 9N.  I am importing a raster that (when opened on it's own) looks fine and is in WGS84.  When I add the raster to my map, it projects incorrectly.  Any suggestions on how to start resolving this would be greatly appreciated.  The raster was exported from Q.
in Coordinate Reference Systems
GeoRex
Hello! I am new to the GIS Community and am looking for some help. I am an Intern working on georeferencing historic aerial photos. How I would normally go about the process is by using control points and manually georeferencing each individual photo. The photos are consecutive and overlap consistently. I've also used the auto registration tool on… (Show more)
in Coordinate Reference Systems
mpcollins@ecslimited.com
Problem: I am trying to plot points on a map that need to be a certain distance apart (i.e. lets say ten (10) feet apart), if i have a central point with X,Y coordinates how would i be able to place a point 10 feet to the North, East, South, and West of the center point as well as add more points going off the previous points, as well as ranging in different intervals. Please Help 
billschmahl
How can I see what vertical datum my contour maps were created using?   Thanks, Bill
in Coordinate Reference Systems
spk578
Introduction The Global Geodetic Reference Frame (GGRF) is the realisation of the Global Geodetic Reference System (GGRS). The GGRS comprises terrestrial and celestial components allowing users to precisely determine and express locations on the Earth, as well as to quantify changes of the Earth system in space and time.    What is the GGRF?… (Show more)
in Coordinate Reference Systems
rr1040
This similar question has been asked before, but not fully answered.  I cannot find any documentation.  It appears that the tool does in-fact apply a transformation, but no way to tell which one. (Despite the fact that the Help for the tool implies that it does not).  Others have stated that it also does not honor the a transformation defined in… (Show more)
in Coordinate Reference Systems
spk578
The European Space Agency ESA is developing a new family of missions called Sentinels specifically for the operational needs of the Copernicus programme.   See more on the Sentinels here: Overview / Copernicus / Observing the Earth / Our Activities / ESA 
Video preview image▶︎
in Coordinate Reference Systems
johnsonvictoria0814
Hi, everyone! So I'm fairly new to using ArcMap and have only taken one introductory level course using this system. I know the basics but can still get very confused. If this happens to be an easy fix then silly me, but I'm still learning!   Anyway, when I upload two shapefiles to ArcMap they are not overlapping. I have to click "Zoom to Layer"… (Show more)
in Coordinate Reference Systems
fallingdog
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)
in Coordinate Reference Systems
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