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# README.us_usgs
The files in this section result from the conversion of datasets originating
from USGS
TODO: Aren't they coming from NOAA instead ?
## Included grids
### USA: NAD27 -> NAD83
*Source*: USGS
*Format*: GeoTIFF converted from CTable2
*License*: Public Domain
* alaska.tif - Alaska
* conus.tif - Conterminous U.S.
* hawaii.tif - Hawaii
* prvi.tif - Puerto Rico, Virgin Is.
* stgeorge.tif - St. George Is, Alaska
* stlrnc.tif - St. Lawrence Is., Alaska
* stpaul.tif - St. Paul Is., Alaska
### USA: NAD83 -> NAD83 (HARN/HPGN)
*Source*: USGS
*Format*: GeoTIFF converted from CTable2
*License*: Public Domain
Grid data for high precision conversion of geographic coordinates from
the original NAD83 (1986) (EPSG:4269) to NAD83 High Precision Geodetic Networks
(HPGNs) (EPSG:4152), also referred to as High Accuracy Reference Networks (HARNs).
NAD 83 coordinates based on the HPGN/HARN surveys changed approximately 0.2
to 1.0 meter relative to the original NAD 83 (1986) adjustment.
* FL.tif - Florida
* MD.tif - Maryland
* TN.tif - Tennessee
* WI.tif - Wisconsin
* WO.tif - Washington, Oregon, N. California
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