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— Choose a Frequently Asked Question (FAQ) —
 
1.-

All my data are in the NAD 27 or NGVD 29. Do I have to purchase new data or is software available to convert old data to new data?

2.-

Are the developments in computer and communication technology affecting the way agencies manage water resources?

3.-

Are there concerns for Radio Frequency Interference (RFI) with GPS signals, especially in reference to its use for civil aviation?
4.-

Can National Geodetic Survey (NGS) give me the UTM zone or state plane coordinate zone name of a specific site?

5.-

Can you give an example of how a GIS can be used for groundwater planning?
6.-

Considering all the features of GIS data, what happens when two or more datasets are combined?

7.-

How can I use GIS data?

8.-

How do I get started with a GIS?
9.-

How do the National Geodetic Vertical Datum (NGVD 29) and North American Vertical Datum (NAVD 88) differ and why is NAVD 88 now used in place of NGVD 29?
10.-

How does a GIS actually make use of digital geographic-based information?
11.-

How does a GIS help you make better resource management decisions?
12.-

How has recent innovations in computer hardware technologies impacted the use of GIS?
13.-

How is GIS different from other information systems?
14.-

How is the GPS satellite constellation system set up?
15.-

How many GPS satellites are there providing a signal at any given time in the constellation?
16.-

I just got this GIS data layer but can't get it to overlay my county data. What is the problem?
17.-

If I have latitude and longitude for a particular site, can I convert this into state plane coordinates or UTM grid coordinates?
18.-

Is GIS the same as GPS?
19.-

Is GPS the answer to all our detailed mapping needs?
20.-

Is special training needed to use GIS?
21.-

What are attribute data in GIS?
22.-

What are false easting (false x) and false northing (false y) values for map projection coordinates?
23.-

What are geodetic referenced data?
24.-

What are GIS standards?
25.-

What are latitude and longitude and how do they relate to GIS?
26.-

What are NAD27, NAD83, GRS80, WGS84 Datum, and State Plane Coordinate System?
27.-

What are primary functions of a GIS?
28.-

What are scale and resolution for GIS maps and images?
29.-

What are some of the GPS applications to GIS and water resources?
30.-

What are the advantages of a GIS over other information systems?
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This website was developed by the ACES Water Quality Team, under the leadership of Dr. James E. Hairston. It is funded, in part, by USDA-CSREES water quality grant support under Section 406 of the Agricultural Research, Extension and Education Reform Act of 1998.