Original Adjustment to NAD83(86)
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Area |
Description |
Grid Pair File Prefix |
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CONUS |
Conterminous 48 States: NAD27 - NAD83(86) |
conus |
Hawaii |
Hawaiian Islands: Hawaii Datum - NAD83(86) |
hawaii |
Alaska |
Alaska, including Aleutians: NAD27 - NAD83(86) |
alaska |
St. George Is., AK |
Alaska, St. George Island only: Island Datum - NAD83(86) Alaska, St. George Island only |
stgeorge |
St. Lawrence Is., AK |
Alaska, St. Lawrence Island only: Island Datum - NAD83(86) Alaska, St. Lawrence Island only |
stlrnc |
St. Paul Is., AK |
Alaska, St. Paul Island only: Island Datum - NAD83(86) |
stpaul |
Puerto Rico and Virgin Islands |
Puerto Rico and the American Virgin Islands: Puerto Rico Datum - NAD83(86) |
prvi |
St. George Is. and St. Paul Is. are part of a region known as the Pribilof Islands. There were two separate datums, one for each Island, before NAD83(86). The old island datums differ significantly from NAD27.
The CONUS grids cover an area from 20 to 50 degrees north latitude and from 63 to 131 degrees west longitude. The Alaskan grids cover an area from 46 to 77 degrees north latitude and from 128 to 194 degrees west longitude. The CONUS and Alaskan grids overlap between 46 to 50 degrees north latitude and 128 to 131 degrees west longitude. In this area, the CONUS and Alaskan grids agree within 2 centimeters. For those cases requiring precision greater than this, the CONUS grids are to be considered correct.
NAD83(86) to High Accuracy Reference Networks (HARN/HPGN)
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Area |
Description |
Grid Pair File Prefix |
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Alabama |
Alabama HARN: NAD83(86) - NAD83(92) |
alhpgn |
Arkansas |
Arkansas HARN: NAD83(86) - NAD83(97) |
arhpgn |
Arizona |
Arizona HARN: NAD83(86) - NAD83(92) |
azhpgn |
California |
California HARN, 37 degrees latitude and above: NAD83(86) - NAD83(92) |
cnhpgn |
California |
California HARN, 37 degrees latitude and below: NAD83(86) - NAD83(92) |
cshpgn |
Colorado |
Colorado HARN: NAD83(86) - NAD83(92) |
cohpgn |
Florida |
Florida HARN: NAD83(86) - NAD83(90) |
flhpgn |
Georgia |
Georgia HARN: NAD83(86) - NAD83(94) |
gahpgn |
Hawaii |
Hawaii HARN: NAD83(86) - NAD83(93) |
hihpgn |
Idaho - Montana |
Idaho and Montana HARN, 113 degrees longitude and east: NAD83(86) - NAD83(92) |
emhpgn |
Idaho - Montana |
Idaho and Montana HARN, 113 degrees longitude and west: NAD83(86) - NAD83(92) |
wmhpgn |
Iowa |
Iowa HARN: NAD83(86) - NAD83(96) |
iahpgn |
Illinois |
Illinois HARN: NAD83(86) - NAD83(97) |
ilhpgn |
Indiana |
Indiana HARN: NAD83(86) - NAD83(97) |
inhpgn |
Kansas |
Kansas HARN: NAD83(86) - NAD83(97) |
kshpgn |
Kentucky |
Kentucky HARN: NAD83(86) - NAD83(93) |
kyhpgn |
Louisiana |
Louisiana HARN: NAD83(86) - NAD83(92) |
lahpgn |
Maryland - Delaware |
Maryland and Delaware HARN: NAD83(86) - NAD83(91) |
mdhpgn |
Maine |
Maine HARN: NAD83(86) - NAD83(96) |
mehpgn |
Michigan |
Michigan HARN: NAD83(86) - NAD83(94) |
*mihpgn |
Minnesota |
Minnesota HARN: NAD83(86) - NAD83(96) |
mnhpgn |
Mississippi |
Mississippi HARN: NAD83(86) - NAD83(92) |
mshpgn |
Missouri |
Missouri HARN: NAD83(86) - NAD83(97) |
mohpgn |
Nebraska |
Nebraska HARN: NAD83(86) - NAD83(95) |
nbhpgn |
Nevada |
Nevada HARN: NAD83(86) - NAD83(94) |
nvhpgn |
New England |
Connecticutt, Massachusetts, New Hampshire, Rhode Island, Vermont HARN: NAD83(86) - NAD83(96) |
nehpgn |
New Jersey |
New Jersey HARN: NAD83(86) - NAD83(96) |
njhpgn |
New Mexico |
New Mexico HARN: NAD83(86) - NAD83(92) |
nmhpgn |
New York |
New York HARN: NAD83(86) - NAD83(96) |
nyhpgn |
North Carolina |
North Carolina HARN: NAD83(86) - NAD83(01) |
nchpgn |
North Dakota |
North Dakota HARN: NAD83(86) - NAD83(96) |
ndhpgn |
Ohio |
Ohio HARN: NAD83(86) - NAD83(95) |
ohhpgn |
Oklahoma |
Oklahoma HARN: NAD83(86) - NAD83(93) |
okhpgn |
Pennsylvania |
Pennsylvania HARN: NAD83(86) - NAD83(92) |
pahpgn |
Puerto Rico - Virgin Islands |
Puerto Rico - Virgin Islands HARN: NAD83(86) - NAD83(97) |
pvhpgn |
South Carolina |
South Carolina HARN: NAD83(86) - NAD83(01) |
schpgn |
South Dakota |
South Dakota HARN: NAD83(86) - NAD83(96) |
sdhpgn |
Tennessee |
Tennessee HARN: NAD83(86) - NAD83(95) |
tnhpgn |
Texas |
Texas HARN, 100 degrees longitude and east: NAD83(86) - NAD83(93) |
ethpgn |
Texas |
Texas HARN, 100 degrees longitude and west: NAD83(86) - NAD83(93) |
wthpgn |
Utah |
Utah HARN: NAD83(86) - NAD83(94) |
uthpgn |
Virginia |
Virginia HARN: NAD83(86) - NAD83(93) |
vahpgn |
Washington - Oregon |
Washington - Oregan HARN: NAD83(86) - NAD83(91) |
wohpgn |
West Virginia |
West Virginia HARN: NAD83(86) - NAD83(95) |
tnhpgn |
Wisconsin |
Wisconsin HARN: NAD83(86) - NAD83(95) |
wihpgn |
Wyoming |
Wyoming HARN: NAD83(86) - NAD83(93) |
wyhpgn |
* During the analysis of the transformation grids for Michigan, a serious inconsisitency was found in the positional shifts for the control on Isle Royale when compared with the mainland portion of the state. Investigation revealed that this was due to the fact that no HARN stations had been observed on the island, and that the existing horizontal control had poor geometric ties to the networks in Michigan and Minnesota. The island is classified as a wilderness area by the National Park Service and will see little if any development. Therefore, the data for this area was omitted in the development of the transformation grids.
Other
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Area |
Description |
Grid Pair File Prefix |
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American Samoa |
Ofu, Olosega, Ta'u Islands: American Samoa 1962 - NAD83(93) |
**eshpgn |
American Samoa |
Tutuila, Aunu'u Islands: American Samoa 1962 - NAD83(93) |
**wshpgn |
Guam |
Guam: Guam 1963 - NAD83(93) |
guhpgn |
** The positional data for American Samoa is distributed over two clusters of islands separated by many miles of ocean. The lack of control on which to base grids which this separation represents creates distortions unless the grids are split into two separate grid pairs.
Guam and American Samoa never went through the intermediate step of island datum to NAD83(86). Those islands were adjusted directly from their old island datums to HPGN/HARN.