New Jersey Geological Survey
DGS99-1 Monochromatic Bit-Mapped 7.5 Minute Topographic Images of
New Jersey
METADATA
1.IDENTIFICATION INFORMATION
1.1. CITATION
Monochromatic Bit-Mapped 7.5 Minute Topographic Images of
New Jersey
Gregory C. Herman and Maryann C. Scott
N.J. Geological Survey Digital Geodata Series DGS99-1
May 27, 1999
1.2. DESCRIPTION
1.2.1 ABSTRACT
N.J. Geological Survey DGS99-1 is a set of monochromatic,
bit-mapped, TIFF (tagged image file format) images
covering New Jersey. The images are derived from the U.S.
Geological Survey 7-1/2' topographic quadrangle map Digital
Raster Graphics (DRG) imagery. The images are reprocessed
at the original 250 dpi image resolution to create a set of
seamless, tiled, monochromatic images for use within a
Geographic Information System (GIS). Some map features were
set to equal the background value prior to conversion to a
monochromatic image mode in order to enhance image clarity
for use as base maps. The conversion of the full-color
topographic-map images to monochromatic mode results in the
loss of some map information, such as shading for wooded
areas. Each file was processed to include only image
features within the N.J. State and quadrangle neatline
boundaries. The TIFF images are georegistered and rectified
to the 1983 North American Datum in state plane coordinate
feet using at least four links corresponding to 7.5-minute
graticules. Each georeferenced TIFF image was converted to
an ARC/INFO GRID and clipped to neatline boundaries using
ArcView 3.0a software with the Spatial Analyst extension
running the Avenue script gridclip.ave. The resulting
grids were reconverted to TIFF images for distribution as
compressed zip files.
1.2.2 LIST OF DIRECTORIES AND FILES WITH BRIEF DESCRIPTIONS
Each 7-1/2' topographic image is saved as an ARC/INFO GRID
and an uncompressed monochromatic bit map using the tagged
image file format (TIFF). Following is the list of file names,
file sizes, and quadrangle names for the images covering New
Jersey. Each TIFF image includes a file having the root
file name and the tif and tfw file-name extensions. The zip
files are compressed versions of the uncompressed tif image
files and contain both the *.tif and *.tfw files.
FILE FILE SIZES
NAME GRID TIFF/TFW ZIP QUADRANGLE NAME
nj001 1.04MB 1.97MB 476KB Milford
nj002 1.90MB 2.57MB 922KB Port Jervis South
nj003 1.10MB 1.80MB 388KB Unionville
nj004 98KB 127KB 29KB Pine Island
nj005 875KB 1.03MB 217KB Lake Maskenozha
nj006 2.56MB 3.01MB 1.26MB Culvers Gap
nj007 2.69MB 3.00MB 1.31MB Branchville
nj008 2.81MB 3.00MB 1.41MB Hamburg
nj009 2.05MB 2.99MB 1.21MB Wawayanda
nj010 1.66MB 1.96MB 658KB Greenwood Lake
nj011 351KB 277KB 71KB Sloatsburg
nj012 932KB 1.64MB 336KB Bushkill
nj013 2.64MB 3.02MB 1.35MB Flatbrookville
nj014 2.73MB 3.02MB 1.36MB Newton West
nj015 2.65MB 3.01MB 1.32MB Newton East
nj016 2.82MB 3.00MB 1.41MB Franklin
nj017 2.29MB 3.01MB 1.42MB Newfoundland
nj018 3.25MB 3.01MB 1.49MB Wanque
nj019 3.80MB 3.02MB 1.58MB Ramsey
nj020 2.14MB 2.32MB 846KB Park Ridge
nj021 748KB 714KB 199KB Nyack
nj022 290KB 61KB 27KB Stroudsburg
nj023 2.29MB 3.02MB 1.12MB Portland
nj024 2.43MB 3.04MB 1.27MB Blairstown
nj025 2.31MB 3.02MB 1.23MB Tranquility
nj026 2.81MB 3.02MB 1.42MB Stanhope
nj027 3.05MB 3.01MB 1.50MB Dover
nj028 2.22MB 3.01MB 1.31MB Boonton
nj029 3.24MB 3.02MB 1.49MB Pompton Plains
nj030 4.10MB 3.02MB 1.90MB Patterson
nj031 3.93MB 3.03MB 1.84MB Hackensack
nj032 2.47MB 2.55MB 1.22MB Yonkers
nj033 416KB 492KB 108KB Bangor
nj034 2.21MB 3.04MB 1.05MB Belvidere
nj035 2.67MB 3.04MB 1.32MB Washington
nj036 2.31MB 3.03MB 1.20MB Hackettstown
nj037 2.55MB 3.02MB 1.32MB Chester
nj038 2.90MB 3.01MB 1.39MB Mendham
nj039 2.10MB 3.01MB 1.38MB Morristown
nj040 2.73MB 3.02MB 1.40MB Caldwell
nj041 3.46MB 3.03MB 1.75MB Orange
nj042 3.40MB 3.03MB 1.53MB Weehawken
nj043 1.37MB 1.16MB 401KB Central Park
nj044 1.86MB 1.94MB 737KB Easton
nj045 2.18MB 3.06MB 1.27MB Bloomsbury
nj046 2.42MB 3.05MB 1.21MB High Bridge
nj047 2.45MB 3.04MB 1.25MB Califon
nj048 2.59MB 3.03MB 1.18MB Gladstone
nj049 2.22MB 3.02MB 1.13MB Bernardsville
nj050 2.90MB 3.02MB 1.52MB Chatham
nj051 3.27MB 3.03MB 1.61MB Roselle
nj052 3.10MB 3.04MB 1.45MB Elizabeth
nj053 1.63MB 2.23MB 827KB Jersey City
nj055 818KB 915KB 347KB Riegelsville
nj056 2.04MB 3.04MB 982KB Frenchtown
nj057 1.74MB 3.05MB 948KB Pittstown
nj058 2.11MB 3.04MB 1.13MB Flemington
nj059 1.43MB 3.04MB 1.13MB Raritan
nj060 2.64MB 3.03MB 1.23MB Bound Brook
nj061 2.21MB 3.02MB 1.37MB Plainfield
nj062 2.46MB 3.03MB 1.57MB Perth Amboy
nj063 484KB 1.04MB 279KB Arthur Kill
nj066 1.11MB 1.34MB 392KB Lumberville
nj067 1.63MB 3.05MB 927KB Stockton
nj068 1.61MB 3.05MB 995KB Hopewell
nj069 1.57MB 3.04MB 912KB Rocky Hill
nj070 2.02MB 3.03MB 891KB Monmouth Junction
nj071 3.80MB 3.03MB 2.07MB New Brunswick
nj072 1.77MB 3.04MB 1.41MB South Amboy
nj073 1.85MB 2.68MB 897KB Keyport
nj074 1.72MB 2.99MB 646KB Sandy Hook
nj076 847KB 1.14MB 320KB Lambertville
nj077 1.79MB 3.05MB 1.03MB Pennington
nj078 1.88MB 3.04MB 1.12MB Princeton
nj079 1.63MB 3.03MB 836KB Hightstown
nj080 1.11MB 3.03MB 767KB Jamesburg
nj081 1.57MB 3.04MB 938KB Freehold
nj082 1.82MB 3.06MB 1.05MB Marlboro
nj083 2.19MB 2.25MB 1.34MB Long Branch
nj086 1.09MB 2.30MB 276KB Trenton West
nj087 2.88MB 3.05MB 1.53MB Trenton East
nj088 1.71MB 3.04MB 994KB Allentown
nj089 1.52MB 3.05MB 1.21MB Roosevelt
nj090 3.73MB 3.05MB 1.85MB Adelphia
nj091 2.54MB 3.06MB 1.45MB Farmingdale
nj092 3.56MB 3.25MB 1.72MB Asbury Park
nj093 231KB 315KB 78KB Frankford
nj094 1.08MB 1.97MB 590KB Beverly
nj095 1.67MB 3.05MB 802KB Bristol
nj096 1.65MB 3.05MB 940KB Columbus
nj097 1.87MB 3.04MB 1.04MB New Egypt
nj098 1.30MB 3.05MB 975KB Cassville
nj099 1.72MB 3.05MB 1.04MB Lakehurst
nj100 2.94MB 3.06MB 1.58MB Lakewood
nj101 2.84MB 2.31MB 1.09MB Point Pleasant
nj102 431KB 1.26MB 82KB Philadelphia
nj103 2.67MB 3.08MB 1.51MB Camden
nj104 2.60MB 3.08MB 1.27MB Moorestown
nj105 1.77MB 3.07MB 1.02MB Mt Holly
nj106 1.57MB 3.06MB 884KB Pemberton
nj107 1.78MB 3.05MB 1.06MB Brown Mills
nj108 1.25MB 3.05MB 894KB Whiting
nj109 1.73MB 3.06MB 964KB Keswick Grove
nj110 2.78MB 3.07MB 1.70MB Toms River
nj111 1.76MB 1.61MB 442KB Seaside Park
nj112 777KB 1.38MB 246KB Marcus Hook
nj113 1.41MB 2.54MB 828KB Bridgeport
nj114 1.88MB 3.09MB 1.05MB Woodbury
nj115 2.75MB 3.09MB 1.61MB Runnemede
nj116 2.15MB 3.08MB 1.16MB Clementon
nj117 1.75MB 3.07MB 958KB Medford Lakes
nj118 1.58MB 3.07MB 918KB Indian Mills
nj119 1.52MB 3.06MB 894KB Chatsworth
nj120 1.24MB 3.06MB 868KB Woodmansie
nj121 1.70MB 3.06MB 988KB Brookville
nj122 2.48MB 3.08MB 1.42MB Forked River
nj123 1.49MB 1.05MB 360KB Barnegat Light
nj124 714KB 897KB 192KB Wilmington South
nj125 2.09MB 3.12MB 1.12MB Penns Grove
nj126 1.90MB 3.11MB 1.09MB Woodstown
nj127 1.90MB 3.11MB 1.03MB Pitman West
nj128 2.15MB 3.10MB 1.16MB Pitman East
nj129 1.68MB 3.09MB 923KB Williamstown
nj130 1.68MB 3.08MB 890KB Hammonton
nj131 1.51MB 3.07MB 814KB Atsion
nj132 1.56MB 3.06MB 864KB Jenkins
nj133 3.52MB 3.06MB 2.27MB Oswego Lake
nj134 1.88MB 3.07MB 1.11MB West Creek
nj135 1.84MB 3.07MB 831KB Ship Bottom
nj136 229KB 115KB 29KB Long Beach
nj137 970KB 1.48MB 311KB Delaware City
nj138 1.51MB 3.13MB 775KB Salem
nj139 1.83MB 3.12MB 1.00MB Alloway
nj140 1.51MB 3.11MB 801KB Elmer
nj141 1.56MB 3.10MB 875KB Newfield
nj142 1.39MB 3.09MB 716KB Buena
nj143 1.82MB 3.08MB 1.02MB Newtonville
nj144 1.80MB 3.08MB 966KB Egg Harbor City
nj145 1.71MB 3.07MB 923KB Green Bank
nj146 1.76MB 3.07MB 1.31MB New Gretna
nj147 2.83MB 3.08MB 1.35MB Tuckerton
nj148 1.07MB 894KB 258KB Beach Haven
nj149 446KB 436KB 119KB Taylors Bridge
nj150 1.77MB 3.11MB 941KB Canton
nj151 1.73MB 3.13MB 973KB Shiloh
nj152 1.85MB 3.12MB 973KB Bridgeton
nj153 1.82MB 3.11MB 1.06MB Millville
nj154 1.64MB 3.10MB 805KB Five Points
nj155 1.52MB 3.09MB 804KB Dorothy
nj156 1.97MB 3.08MB 1.10MB Mays Landing
nj157 2.07MB 3.07MB 1.29MB Pleasantville
nj158 1.96MB 3.07MB 1.48MB Oceanville
nj159 1.42MB 1.77MB 407KB Brigantine Inlet
nj160 85KB 96KB 16KB Bombay Hook Island
nj161 1.09MB 2.09MB 490KB Ben Davis Point
nj162 1.25MB 3.11MB 602KB Cedarville
nj163 1.59MB 3.11MB 763KB Dividing Creek
nj164 1.80MB 3.10MB 873KB Port Elizabeth
nj165 1.43MB 3.10MB 708KB Tuckahoe
nj166 2.25MB 3.09MB 1.44MB Marmora
nj167 2.72MB 3.08MB 1.32MB Ocean City
nj168 721KB 936KB 344KB Atlantic City
nj169 553KB 980KB 145KB Fortescue
nj170 641KB 1.48MB 226KB Port Norris
nj171 1.32MB 3.10MB 534KB Heislerville
nj172 1.79MB 3.10MB 1.00MB Woodbine
nj173 2.54MB 3.44MB 1.07MB Sea Isle City
nj174 1.14MB 2.03MB 387KB Rio Grande
nj175 2.64MB 3.10MB 1.36MB Stone Harbor
nj176 843KB 581KB 192KB Avalon
nj177 1.18MB 1.39MB 464KB Cape May
nj178 907KB 1.06MB 296KB Wildwood
1.3. LIST OF KEYWORDS
ARC/INFO GRID, bit-mapped images, base maps, topographic
image, TIFF image, georegistered bit-mapped image,
monochromatic image
1.3. GEOGRAPHIC EXTENT
State of New Jersey
1.5. CONTACTS INFORMATION
Gregory C. Herman
N.J. Dept. Environmental Protection
Division of Science & Research
N. J. Geological Survey
PO Box 427
Trenton, NJ 08625
phone: (609) 984-6587
email: gherman@dep.nj.gov
*********************************************************
2. DATA QUALITY INFORMATION
2.1 DESCRIPTION OF THE TYPE OF DATA
Monochromatic (bit map) image grids at 250 dpi resolution
2.2 DATA SOURCE
The Grids are compiled from the U.S. Geological Survey
(USGS) DRG image series distributed by the USGS on compact
discs (CD's). Source information for the images are
summarized below and include the list of CD's, file names,
and corresponding map sources for the imagery:
CD ONE-DEGREE
LABEL SHEET FILE NAME 7-1/2 QUADRANGLE (DATE)
039075 NEW YORK-W 040073C8.TIF Long Branch, NJ (1981)
040073D8.TIF Sandy Hook, NJ-NY (1981)
040073G8.TIF Central Park, NY-NJ (1979)
040073H8.TIF Yonkers, NY-NJ (1966)
398573 SCRANTON-W 040075A1.TIF Bushkill, PA-NJ (1993)
398574 SCRANTON-E 041074A1.TIF Park Ridge, NJ-NY (1955)
041074A2.TIF Ramsey, NJ-NY (1955)
041074A3.TIF Wanaque, NJ (1954)
041074A4.TIF Newfoundland, NJ (1954)
041074A5.TIF Franklin, NJ (1971)
041074A6.TIF Newton East, NJ (1971)
041074A7.TIF Newton West, NJ (1971)
041074A8.TIF Flatbrookville, NJ-NY (1992)
041074B2.TIF Sloatsburg, NY-NJ (1955)
041074B3.TIF Greenwood Lake, NY-NJ (1954)
041074B4.TIF Waywayanda, NJ-NY (1954)
041074B5.TIF Hamburg, NJ (1976)
041074B6.TIF Branchville, NJ (1976)
041074B7.TIF Culvers Gap, NJ-PA (1976)
041074B8.TIF Lake Maskenhoza, PA-NJ (1973)
041074C4.TIF Pine Island, NY-NJ (1969)
041074C5.TIF Unionville, NY-NJ (1969)
041074C6.TIF Port Jervis South, NY-NJ (1983)
041074C7.TIF Milford, PA-NJ (1983)
419745 NEWARK-W 040075A1.TIF Frankford, PA-NJ (1983)
040075D1.TIF Lumberville, PA-NJ (1969 & 1973)
040075E1.TIF Frenchtown, NJ-PA (1994)
040075E2.TIF Riegelsville, PA-NJ (1968 & 1973)
040075F1.TIF Bloomsbury, NJ (1970)
040075F2.TIF Easton, PA-NJ (1994)
040075G1.TIF Belvidere, NJ-PA (1992)
040075G2.TIF Bangor, PA-NJ (1994)
040075H1.TIF Portland, PA-NJ (1992)
040075H2.TIF Stroudsburg, PA (1992)
419746 NEWARK-E 040074A1.TIF Point Pleasant, NJ (1989)
040074A2.TIF Lakewood, NJ (1989)
040074A3.TIF Lakehurst, NJ (1957)
040074A4.TIF Cassville, NJ (1957)
040074A5.TIF New Egypt, NJ (1977)
040074A6.TIF Columbus, NJ (1981)
040074A7.TIF Bristol, PA-NJ (1981)
040074A8.TIF Beverly, NJ-PA (1973)
040074B1.TIF Asbury Park, NJ (1989)
040074B2.TIF Farmingdale NJ (1989)
040074B3.TIF Adelphia, NJ (1981)
040074B4.TIF Roosevelt, NJ (1981)
040074B5.TIF Allentown, NJ (1981)
040074B6.TIF Trenton East, NJ-PA (1981)
040074B7.TIF Trenton West, NJ-PA (1981)
040074C2.TIF Marlboro, NJ (1981)
040074C3.TIF Freehold, NJ (1981)
040074C4.TIF Jamesburg, NJ (1981)
040074C5.TIF Hightstown, NJ (1981)
040074C6.TIF Princeton, NJ (1981)
040074C7.TIF Pennington, NJ-PA (1981)
040074C8.TIF Lambertville, PA-NJ (1973)
040074D2.TIF Keyport, NJ-NY (1970)
040074D3.TIF South Amboy, NY-NY (1981)
040074D4.TIF New Brunswick, NJ (1981)
040074D5.TIF Monmouth Junction, NJ (1981)
040074D6.TIF Rocky Hill, NJ (1970)
040074D7.TIF Hopewell, NJ (1970)
040074D8.TIF Stockton, NJ (1981)
040074E1.TIF The Narrows, NY-NJ (1981)
040074E2.TIF Arthur Kill (NY) (1981)
040074E3.TIF Perth Amboy, NJ (1981)
040074E4.TIF Plainfield, NJ (1981)
040074E5.TIF Bound Brook, NJ (1970)
040074E6.TIF Raritan, NJ (1981)
040074E7.TIF Flemington, NJ (1970)
040074E8.TIF Pittstown, NJ (1970)
040074F1.TIF Jersey City, NJ-NY (1981)
040074F2.TIF Elizabeth, NJ (1981)
040074F3.TIF Roselle, NJ (1981)
040074F4.TIF Chatham, NJ (1981)
040074F5.TIF Bernarndsville, NJ (1981)
040074F6.TIF Gladstone, NJ (1970)
040074F7.TIF Califon, NJ (1970)
040074F8.TIF High Bridge, NJ (1970)
040074G1.TIF Weehawken, NJ-NY (1981)
040074G2.TIF Orange, NJ (1981)
040074G3.TIf Caldwell, NJ (1981)
040074G4.TIF Morristown, NJ (1981)
040074G5.TIF Mendham, NJ (1981)
040074G6.TIF Chester, NJ (1981)
040074G7.TIF Hackettstown, NJ (1971)
040074G8.TIF Washington, NJ (1971)
040074H1.TIF Hackensack, NJ (1981)
040074H2.TIF Paterson, NJ (1981)
040074H3.TIF Pompton Plains, NJ (1981)
040075H4.TIF Boonton, NJ (1981)
040075H5.TIF Dover, NJ (1981)
040075H6.TIF Stanhope, NJ (1981)
040075H7.TIF Tranquility, NJ (1981)
040075H8.TIF Blairstown, NJ (1981)
419752 WILMINGTON-W 039075A6.TIF Avalon, NJ (1972)
039075A7.TIF Stone Harbor, NJ (1972)
039075A8.TIF Rio Grande, NJ (1977)
039075B6.TIF Sea Isle City, NJ (1972)
039075B7.TIF Woodbine, NJ (1972)
039075B8.TIF Heislerville, NJ (1972)
039075C4.TIF Atlantic City, NJ (1989)
039075C5.TIF Ocean City, NJ (1989)
039075C6.TIF Marmora, NJ (1989)
039075C7.TIF Tuckahoe, NJ (1977)
039075C8.TIF Port Elizabeth, NJ (1972)
039075D3.TIF Briigantine Inlet (1989)
039075D4.TIF Oceanville, NJ (1989)
039075D5.TIF Pleasantville, NJ (1989)
039075D6.TIF Mays Landing, NJ (1989)
039075D7.TIF Dorothy, NJ (1972)
039075D8.TIF Five Points, NJ (1972)
039075E2.TIF Beach Haven, NJ (1972)
039075E3.TIF Tuckerton, NJ (1972)
039075E4.TIF New Gretna, NJ (1972)
039075E5.TIF Green Bank, NJ (1972)
039075E6.TIF Egg Harbor City, NJ (1972)
039075E7.TIF Newtonville, NJ (1972)
039075E8.TIF Buena, NJ (1970)
039075F1.TIF Long Beach NE, NJ (1977)
039075F2.TIF Ship Bottom, NJ (1972)
039075F3.TIF West Creek, NJ (1972)
039075F4.TIF Oswego Lake, NJ (1969)
039075F5.TIF Jenkins, NJ (1977)
039075F6.TIF Atsion, NJ (1977)
039075F7.TIF Hammonton, NJ (1981)
039075F8.TIF Williamstown, NJ (1981)
039075G8.TIF Clementon, NJ (1981)
039075G7.TIF Medford Lakes, NJ (1981)
039075G6,TIF Indian Mills, NJ (1977)
039075G5.TIF Chatsworth, NJ (1957)
039075G4.TIF Woodmansie, NJ (1977)
039075G3.TIF Brookville, NJ (1972)
039075G2.TIF Forked River, NJ (1989)
039075G1.TIF Barnegat Light, NJ (1989)
039075H1.TIF Seaside Park, NJ (1989)
039075H2.TIF Toms River, NJ (1989)
039075H3.TIF Keswick Grove, NJ (1957)
039075H4.TIF Whiting, NJ (1957)
039075H5.TIF Brown Mills, NJ (1957)
039075H6.TIF Pemberton, NJ (1957)
039075H7.TIf Mount Holly, (1967)
039075H8.TIF Moorestown, NJ (1966)
451818 HARTFORD-W 041073A8.TIF Nyack, NY-NJ (1979)
582200 WILMINGTON-E 039074B1.TIF Port Norris, NJ (1992)
039074B2.TIF Fortescue, NJ-Del (1992)
039074C1.TIF Dividing Creek, NJ (1986)
039074C2.TIF Cedarville, NJ (1922)
039074C3.TIF Ben Davis Point, NJ-Del (1993)
039074C4.TIF Bombay Hook Island, Del-NJ (1993)
039074D1.TIF Millville, NJ (1986)
039074D2.TIF Bridgeton, NJ (1972)
039074D3.TIF Shiloh, NJ (1993)
039074D4.TIf Canton, NJ-Del (1993)
039074D5.TIF Taylors Bridge, Del-NJ (1993)
039074E1.TIF Newfield, NJ (1994)
039074E2.TIF Elmer, NJ (1994)
039074E3.TIF Alloway, NJ (1970)
039074E4.TIF Salem, NJ (1993)
039074E5.TIF Delaware City, Del-NJ (1993)
039074F1.TIF Pitman East, NJ (1994)
039074F2.TIF Pitman West, NJ (1994
039074F3.TIF Woodstown, NJ (1982)
039074F4.TIF Penns Grove, NJ-DEL (1993)
039074F5.TIF Wilmington South, DEL-NJ (1993)
039074G1.TIF Runnemede, NJ (1994)
039074G2.TIF Woodbury, NJ-PA (1986)
039074G3.TIF Bridgeport, NJ-PA (1994)
039074G4.TIF Marcus Hook, PA-NJ-DEL (1993)
039074H1.TIF Camden, NJ-PA (1967)
039074H2.TIF Philadelphia, PA-NJ (1994)
634224 SALISBURY-E 039075H8.TIF Cape May, NJ (1972)
039075H7.TIF Wildwood, NJ (1977)
2.3. DATA ORGANIZERS
Maryann Scott and Gregory Herman georegistered and
rectified the images, processed the GRIDS and compiled
the metadata.
2.4. DATE OF COMPLETION
May 26, 1999
2.5. DATA AUTOMATION AND ACCURACY
Images were copied from the UGSG DRG source CDs to a
computer hard disk for subsequent processing. Each
image was converted to a monochromatic bit map using
a raster-graphic image editor by manually resetting
11 of the 13 color index values in the image's color
map in the following manner:
USGS DRG --> NJGS Monochromatic
Color Palette Bit Map Equivalents
-------------------------------------------------
Color (Red,Green,Blue) --> Color
-------------------------------------------------
Black (0,0,0) Black (0,0,0)
White (255,255,255) White (255,255,255)
Blue (0,151,164) Black (0,0,0)
Red (203,0,23) Black (0,0,0)
Brown (131,66,37) Black (0,0,0)
Green (201,234,157) White (255,255,255)
Purple (137,51,128) Black (0,0,0)
Yellow (255,234,0) Black (0,0,0)
Light Blue (167,226,226) White (255,255,255)
Light Red (255,184,184) White (255,255,255)
Light Purple (218,179,214) White (255,255,255)
Light Grey (209,209,209) Black (0,0,0)
Light Brown (207,164,142) Black (0,0,0).
Each image was georegistered and rectified into the 1983
North American Datum (NAD83) in state plane coordinate
feet using ARC/INF0 (Version 7.1.1) software. Image
registration information is referenced in section 2.6
below.
Each image was imported into the ArcView (v. 3.0a) GIS
program for conversion to a ARC/INFO grid using the
Spatial Analyst software. Each grid was cropped to
the neatline boundary of the 7-1/2 minute quadrangle
using the ArcView Avenue script gridclip.ave, then
saved as a new grid.
Following is an excerpt from an U.S. Geological Survey
metadata file outlining the processing steps involved in
production of a standard DRG product. This information
is supplied here in lieu of including USGS metadata files
for all source images:
PROCESS DESCRIPTION: The production procedures,
instrumentation, hardware, and software used in the
collection of standard DRG products vary depending on
systems used at the contract, cooperator or USGS
production sites. The majority of DRG data sets are
acquired through government contract. The process step
describes, in general, the processes used in the
production of standard DRG data sets.
1. Production of a DRG begins with the scanning of a
paper 7.5-minute topographic map (map1) on a
high-resolution scanner. Scanning resolutions range
from 500 - 1000 dpi with the output file running
between 160-300 Mb.
2. Removal of screens (descreening) and color
quantization to reduce the number of colors also takes
place during the scanning phase.
3. The raw scan file is then transformed and
georeferenced using UTM coordinates of the sixteen
2.5-minute grid ticks, which are obtained using the
in-house produced program COORDAT and stored in a ground
control file. Those sixteen 2.5-minute ticks are
interactively visited and assigned their respective
UTM coordinates. USGS program XSHAPES4 then performs a
piecewise linear rubber sheet transformation.
4. An output resolution of 2.4 meters (8.2 feet) is
chosen in order to resample the file to 250 dpi.
5. The image file is converted to a TIFF and further
reduced by converting the file to a run length
encoding Packbits compression(type 32773).
6. The color palette of the compressed DRG is then
standardized by replacing the original RGB values
assigned during the scanning process with standard RGB
value combinations using the in-house produced TIFFREMAP
program.
7. Prior to archiving the DRG undergoes the following
quality assurance procedures:
a. The color index values of each DRG are checked to
ensure the RGB combinations are consistent with the
standardized color palette.
b. All DRG files are inspected to ensure that they
are geometrically consistent with normal map
presentation.
c. Selected DRG's are checked to ensure that data
elements in the DRG metadata file correspond to the
map collar information and to the information in the
associated image file.
d. Selected DRG's are checked for georeferencing
accuracy by comparing the book value of latitude and
longitude tick marks with corresponding tick
intersections in the DRG image.
e. Transformations are checked on selected DRG's by
comparing the positions of well defined points, such
as UTM grid intersections in the graphic product, with
the corresponding image points in the DRG.
USGS DRG production specifications are available on
request from the National Mapping Division and
Mid-Continent Mapping Center by contacting:
Rolla-ESIC
U.S. Geological Survey
1400 Independence Rd., MS231
Rolla, MO 65401-2602
Phone (573) 308-3500
Facsimile (573) 308-3615
E-mail to mcmcesic@usgs.gov
World Wide Web: http://mcmcweb.er.usgs.gov/drg/
All rectified images were checked for horizontal accuracy
by comparing locations of 7-1/2 minute ticks on the
imagery to those in the vector coverage used for
georegistration. Each image meets the National Map
Accuracy Standard (NMAS) for the 1:24,000 (not more than
10% of the points tested shall be in error more than
40.00 feet).
2.6 IMAGE REGISTRATION RESULTS
Refer to ASCII (MS-DOS) text file
dgs991par.txt
for a complete listing of the registration information for
each 7-1/2' quadrangle image.
*********************************************************
3. SPATIAL DATA ORGANIZATION INFORMATION
3.1 DATA STRUCTURE
The TIFF images are monochromatic bit maps. The
georegistration coordinate files (*.tfw) are ASCII text
files
ARC/INFO grids are raster (cell-based) data with
relational database attributes for each cell. Grids are
stored within ARC/INFO workspaces; directory-level
computer files containing grid and INFO subdirectories.
Each grid possesses a directory-level computer file
structure. Each categorical grid has an associated value
attribute table (VAT) that is stored in the INFO
relational database.
Grids use a hierarchical tile-block structure. Each grid
is first divided into uniform square units called tiles.
Each tile represents an actual portion of geographic
space. A tile is divided into blocks. Blocks are
rectangular units with the x-axis direction longer than
the y-axis direction. A block is made up of square cells
arranged in a Cartesian matrix consisting of rows and
columns.
An ARC/INFO GRID is stored as a separate directory with
associated tables and files that contain specific
information about the grid. Each GRID has the following
set of files residing under the directory bearing the
file name (for example, nj001):
dblbnd.adf - table storing information about the grid
boundary
hdr.adf - binary file storing information about cell
resolution and blocking factor
log - file containing information about activity that
has occurred on the grid
sta.adf - INFO table containing statistics for the grid
vat.adf - INFO table storing attributes associated with
the zones of a grid
w001001.adf - tile file that stores the cell data
w001001x.adf - index file that indexes the blocks in
the tile and log files
In addition to these files, each grid includes two
associated INFO files residing under the INFO directory
within the root workspace. These INFO files are named
sequentially within the workspace and include the
arc####.dat and arc####.nit file names, where #### is a
4-digit numeral related to the sequence of entry within
the ARC/INFO workspace. These INFO files are linked to
the sta.adf and vat.adf files under the file name
directory.
3.2. NUMBER OF SPATIAL OBJECTS
172 tiff image with associated world-reference files
(*.tfw)
*********************************************************
4. SPATIAL REFERENCE INFORMATION
4.1 COMMON DATA PARAMETERS
Scale = 1:24,000
Datum = NAD83
Coordinate System = NJ State Plane
Units = feet
Spheroid = CLARKE 1866 projected to GRS 1980
Projection = Polyconic
Zone = 4701
4.2. BOUNDARY PARAMETERS
Refer to ASCII (MS-DOS) text file
dgs991par.txt
for a complete listing of the boundary parameters for each
7-1/2' quadrangle images.
*********************************************************
5. ENTITY AND ATTRIBUTE INFORMATION
5.1 IMAGE AND GRID PROPERTIES
5.1.1 COMMON PROPERTIES
5.1.1.1 Grid Cell Properties:
Number of Values = 2
Attribute Data (bytes) = 8
5.1.1.2 Image Properties:
Format: TIFF
Type: MONOCHROME
Colormap: NONE
Compression: NONE
Rotation: NONE
Depth: 1
Bands: 1
5.1.2 UNIQUE PROPERTIES
Refer to ASCII (MS-DOS) text file
dgs991par.txt
for a complete listing of the descriptive parameters
and statistics for each 7-1/2' quadrangle image.
---------------------------------------------------------
5.2 LIST OF RELATED DATA FILES
dgs991reg.txt - ASCII (MS-DOS) text file providing a
complete listing of the image georegistration information
for each 7-1/2' quadrangle image.
dgs991par.txt - ASCII (MS-DOS) text file providing a
complete listing of the descriptive parameters and
statistics for each 7-1/2' quadrangle image.
NJDEP reference coverage /data/mapgrids/quads86 is an
ARC/INFO polygon and line vector coverage of the set
of 7-1/2' tiles covering New Jersey
*********************************************************
6. DISTRIBUTION INFORMATION
Data are available in the ARC/INFO GRID format upon
request.
*********************************************************
7. METADATA REFERENCE INFORMATION
7.1 PUBLICATION DATE
May 27, 1999
7.2 AUTHOR
Gregory C. Herman and Maryann C. Scott
