ERDDAP > info > landsat_sst_narrbay_v4_grid

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	Institution	Dataset ID
data			graph			Landsat Satellite Coordinates version 4, Narragansett Bay		M	background		Rhode Island Data...	landsat_sst_narrbay_v4_grid

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	_NCProperties	String	version=2,netcdf=4.9.2,hdf5=1.14.4
attribute	NC_GLOBAL	cdm_data_type	String	Grid
attribute	NC_GLOBAL	comment	String	Values are pixel CENTERS on the native Landsat lattice: 30 m, axis-aligned in WGS 84 / UTM zone 19N (EPSG:32619). Easting = pixel_00_center_easting_m + 30*X, Northing = pixel_00_center_northing_m + 30*Y. Arrays are [Y][X], matching the [time][Y][X] order of the temperature datasets (the version 2 and 3 coordinate datasets were [X][Y]). Mt. Hope Bay is the sub-window Y 695-1070, X 509-776 of Narragansett Bay. The lattice was determined by matching version 2 temperatures to the USGS Landsat Collection 2 Level-2 surface temperature scenes (the source Earth Engine serves): for Landsat 5, 7 and 8 scenes more than 99.7 percent of pixels equal the scene value plus a constant at a single integer offset. With these coordinates the Landsat land/water mask agrees with the OSOM land mask at 96.4 percent of pixels (83.1 percent with version 3 coordinates) and with NOAA BlueTopo at 93.1 percent (82.0 percent); residual offsets against both coastlines are 30 m or less.
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_name	String	Rhode Island Data Discovery/United States Geological Survey
attribute	NC_GLOBAL	defaultGraphQuery	String	Longitude[0:last][0:last]&.draw=surface&.vars=X|Y|Longitude
attribute	NC_GLOBAL	history	String	2026-09-30T17:14:21Z created by step6_write_v4.py (LandSatCoordGlitch repository)
attribute	NC_GLOBAL	infoUrl	String	https://earthexplorer.usgs.gov/ accessed through https://code.earthengine.google.com/
attribute	NC_GLOBAL	institution	String	Rhode Island Data Discovery/United States Geological Survey
attribute	NC_GLOBAL	keywords	String	bay, coordinates, data, discovery, geological, island, landsat, latitude, longitude, narragansett, rhode, satellite, states, survey, united, version
attribute	NC_GLOBAL	license	String	The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.
attribute	NC_GLOBAL	pixel_00_center_easting_m	double	296220.0
attribute	NC_GLOBAL	pixel_00_center_northing_m	double	4590450.0
attribute	NC_GLOBAL	pixel_size_m	double	30.0
attribute	NC_GLOBAL	publication	String	https://doi.org/10.26300/ja0b-xa86
attribute	NC_GLOBAL	recap	String	PROBLEM: the version 2 and version 3 Landsat Satellite Coordinates datasets are an evenly spaced latitude-longitude lattice stretched across a bounding box (71.45-71.15 W, 41.45-41.75 N for Narragansett Bay). The imagery is an unresampled crop of USGS Landsat Collection 2 Level-2 scenes and sits on the native Landsat lattice: 30 m pixels, axis-aligned in WGS 84 / UTM zone 19N (EPSG:32619), rotated about 1.5 degrees from the meridian here. Every version 2/3 position is wrong: by 516-1450 m (median 630 m) in Narragansett Bay and 150-967 m (median 384 m) in Mt. Hope Bay. VERSION 4 LATTICE: pixel centers at Easting = E0 + 30*X, Northing = N0 + 30*Y, with E0 = 296220 m, N0 = 4590450 m (800 x 1130) for Narragansett Bay and E0 = 311490 m, N0 = 4611300 m (268 x 376) for Mt. Hope Bay; longitude and latitude are the inverse UTM 19N projection. Mt. Hope Bay is the sub-window Y 695-1070, X 509-776 of Narragansett Bay. HOW IT WAS PINNED: version 2 temperatures equal the source scene surface-temperature band plus a constant at a single integer offset, for 100.00 percent (Landsat 5, 1984-05-02), 99.86 percent (Landsat 7, 1999-07-07) and 99.74 percent (Landsat 8, 2013-04-04) of pixels; all three scenes (WRS-2 path 12 row 31) give the same lattice. Scenes were read from the Microsoft Planetary Computer mirror of the USGS archive, the same scenes Google Earth Engine serves; the original Earth Engine export script was not available. CONSISTENCY: Landsat land/water mask agreement with the OSOM land mask rises from 83.1 percent (version 3 coordinates) to 96.4 percent (version 4), residual offset +15 m east, -30 m north; with NOAA BlueTopo (depth below zero) from 82.0 to 93.1 percent, residual +15 m east, 0 m north. WHAT THOSE PERCENTAGES MEAN: OSOM and BlueTopo agree with each other at 94.8 percent of the same pixels, and all three agree at 92.1 percent. Shifting the Landsat mask against itself gives 98.0 percent at 1 pixel (42 m), 96.4 percent at 2 pixels (85 m), 92.6 percent at 5 pixels (212 m), 79.0 percent at 21 pixels (891 m). 84 percent of Landsat-OSOM and 60 percent of Landsat-BlueTopo disagreements lie within 3 pixels of a shoreline; 1.7 percent of pixels are water in Landsat and OSOM but unsurveyed in BlueTopo. The remaining disagreement is shoreline definition, not position. CHANGES FROM VERSION 3: corrected positions; arrays are [Y][X] (were [X][Y]) to match the [time][Y][X] temperature datasets; 64-bit values; Easting and Northing added. LIMITS: only path 12 scenes were tested; path 13 scenes (delivered in UTM zone 18N) would have been resampled by Earth Engine onto this lattice. Residual offsets are resolved to 15 m. SIDE FINDINGS, NOT FIXED: version 2 data equal the scene +0.450 degC (Landsat 5), +1.094 degC (Landsat 7), -0.178 degC (Landsat 8), the opposite sign to the version 2 metadata; a few temperatures are unphysical (near -106 and -124 degC). Full description: report/landsat_v4_coordinates.pdf in the LandSatCoordGlitch repository, 2026-09-30.
attribute	NC_GLOBAL	source	String	USGS Landsat Collection 2 Level-2 (LANDSAT/LT05, LE07, LC08 C02 T1_L2), WRS-2 path 12 row 31
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	Translation from x,y coordinates to latitude and longitude for the "Landsat Satellite Surface Temperature v2 and v3" datasets.
attribute	NC_GLOBAL	title	String	Landsat Satellite Coordinates version 4, Narragansett Bay
dimension	Y		short	nValues=1130, evenlySpaced=true, averageSpacing=1.0
attribute	Y	actual_range	short	0, 1129
attribute	Y	comment	String	Row index of the Landsat data files; increases northward.
attribute	Y	long_name	String	Y
attribute	Y	source_name	String	Y
attribute	Y	units	String	count
dimension	X		short	nValues=800, evenlySpaced=true, averageSpacing=1.0
attribute	X	actual_range	short	0, 799
attribute	X	comment	String	Column index of the Landsat data files; increases eastward.
attribute	X	long_name	String	X
attribute	X	source_name	String	X
attribute	X	units	String	count
variable	Longitude		double	Y, X
attribute	Longitude	colorBarMaximum	double	-71.1
attribute	Longitude	colorBarMinimum	double	-71.5
attribute	Longitude	grid_mapping	String	crs
attribute	Longitude	long_name	String	longitude of pixel center
attribute	Longitude	standard_name	String	longitude
attribute	Longitude	units	String	degrees_east
variable	Latitude		double	Y, X
attribute	Latitude	colorBarMaximum	double	41.8
attribute	Latitude	colorBarMinimum	double	41.4
attribute	Latitude	grid_mapping	String	crs
attribute	Latitude	long_name	String	latitude
attribute	Latitude	standard_name	String	latitude
attribute	Latitude	units	String	degrees_north

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.