New Jersey Geological Survey DGS98-7 County Topographic Base Map Digital-Raster-Graphics Images for New Jersey (1:100,000 scale) METADATA IDENTIFICATION INFORMATION 1.1. CITATION County Topographic Base Map Digital-Raster-Graphics Images for New Jersey (1:100,000 scale) Digital Compilation by G.C. Herman N.J. Geological Survey Digital Geodata Series DGS98-7 1.2. DESCRIPTION 1.2.1 ABSTRACT N.J. Geological Survey DGS98-7 is a set of twenty-one (21) topographic base map raster-graphics images of the counties in New Jersey. The colored images are derived from the set of U.S. Geological Survey 1:100,000-scale, 30 x 60 minute, digital raster graphic (DRG) images covering the New Jersey region. The set of 8-bit images preserves the 12-color format and 250 dots-per-inch resolution of the source images. Each source image was processed to remove colored foreground pixels extending beyond the boundary of each county. Most county images are composed of pieces of several images that were manually joined along the 30 x 60 minute map boundaries. Each image was georegistered and rectified to the 1983 North American Datum in state plane coordinate feet using the ARC/INFO Geographic Information System. At least four links corresponding to 7-1/2 minute tics and other points along the image perimeter were used for georegistration. The image files use an uncompressed tagged-image-file format (TIFF). Each zip file contains a colored image with a tif file name extension, and a corresponding world-reference file with a tfw file name extension. 1.2.2. LIST OF FILES AND BRIEF DESCRIPTION The following pairs of files list the image (*.tif), image size, world-reference file (.tfw), and county name for each of the 21 images. The TIFF files use an uncompressed format. The accompanying world-coordinate reference files are ASCII text files containing image georegistration information for the NAD83 New Jersey State Plane Coordinate system. IMAGE (SIZE) WORLD-REFERENCE COUNTY FILE (1KB each) NAME atlantic.tif (6.97MB) atlantic.tfw Atlantic bergen.tif (3.15MB) bergen.tfw Bergen burlington.tif (9.81MB) burlington.tfw Burlington camden.tif (3.59MB) camden.tfw Camden capemay.tif (4.51MB) capemay.tfw Cape May cumberland.tif (5.50MB) cumberland.tfw Cumberland essex.tif (1.40MB) essex.tfw Essex gloucester.tif (4.89MB) gloucester.tfw Gloucester hudson.tif (746KB) hudson.tfw Hudson hunterdon.tif (4.99MB) hunterdon.tfw Hunterdon mercer.tif (3.00MB) mercer.tfw Mercer middlesex (3.46MB) middlesex.tfw Middlesex monmouth.tif (6.31MB) monmouth.tfw Monmouth morris.tif (6.09MB) morris.tfw Morris ocean.tif (8.77MB) ocean.tfw Ocean passaic.tif (3.40MB) passaic.tfw Passaic salem.tif (5.05MB) salem.tfw Salem somerset.tif (3.43MB) somerset.tfw Somerset sussex.tif (6.37MB) sussex.tfw Sussex union.tif (1.10MB) union.tfw Union warren.tif (4.93MB) warren.tif Warren 1.2.4. LIST OF KEYWORDS Raster graphics, county base maps, topographic images, TIFF image, digital raster graphic, georegistered image 1.3. GEOGRAPHIC EXTENT State of New Jersey 1.4. CONTACTS INFORMATION Gregory 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.state.nj.us ********************************************************* 2. DATA QUALITY INFORMATION 2.1. NAME OF DATA atlantic.tif atlantic.tfw bergen.tif bergen.tfw burlington.tif burlington.tfw camden.tif camden.tfw capemay.tif capemay.tfw cumberland.tif cumberland.tfw essex.tif essex.tfw gloucester.tif gloucester.tfw hudson.tif hudson.tfw hunterdon.tif hunterdon.tfw mercer.tif mercer.tfw middlesex middlesex.tfw monmouth.tif monmouth.tfw morris.tif morris.tfw ocean.tif ocean.tfw passaic.tif passaic.tfw salem.tif salem.tfw somerset.tif somerset.tfw sussex.tif sussex.tfw union.tif union.tfw warren.tif warren.tfw 2.1.1 DESCRIPTION OF THE TYPE OF DATA Raster-graphics images are in an uncompressed TIFF format at 250 dpi resolution. The corresponding world-coordinate reference files are in an ASCII text format. 2.1.2 DATA SOURCE The county images were compiled from the U.S. Geological Survey, 1:100,000 scale, digital raster graphics (DRG) image series. Following is the list of CD's, file names, and corresponding map sources for the imagery: CD LABEL AND NAME FILE NAMES 30 x 60 DEGREE MAP NAMES AND DATE 398573 SCRANTON-W F41075A1.TIF/TFW Scranton, PA-NJ (1986) 398574 SCRANTON-E F41074A1.TIF/TFW Middletown, NY-NJ (1986) 419745 NEWARK F40075A1.TIF/TFW Reading, PA-NJ (1984) F40075E1.TIF/TFW Allentown, PA-NJ (1984) 419752 WILMINGTON-W F39075A1.TIF/TFW Dover, DE-NJ-MD (1984) F39075E1.TIF/TFW Wilmington, DE-NJ-PA-MD (1984) 419746 NEWARK F40074A1.TIF/TFW Trenton, NJ-PA-NY (1982) F40074E1.TIF/TFW Newark, NJ-NY (1984) 451818 BRIDGEPORT F41073E1.TIF/TFW Bridgeport CT-NY-NJ (1986) 470809 NEW YORK-W F40073A1.TIF/TFW Long Branch, NJ (1982) F40073E1.TIF/TFW Long Island West, NY-NJ-CT (1986) 582200 WILMINGTON-E F39074A1.TIF/TFW Atlantic City, NJ (1984) F39074E1.TIF/TFW Hammonton, NJ (1984) 634224 SALISBURY-E F38074A1.TIF/TFW Cape May, NJ (1982) 2.1.3. DATA ORGANIZERS Greg Herman processed and georegistered the images, and wrote the metadata. 2.1.4. DATE OF COMPLETION August 27, 1998 2.1.5. DATA AUTOMATION AND ACCURACY The source DRG images covering New Jersey were copied from CD to a hard disk directory for subsequent processing. The set of source images covering a county were identified and the part of each image for that county was copied into a blank image template as a new image selection. Colored foreground pixels containing source and map information in the collar and legend outside of the map neatlines were erased, and the set of image parts covering the county were manually edgematched along neatline boundaries using raster-graphics imaging software. The colored foreground pixels outside of each county boundary were then manually erased. Each resulting county image was registered and rectified into NAD83 State-Plane-Coordinate feet using the ARC/INFO Geographic Information System. All images were georegistered using at least four links corresponding to 7-1/2 minute quadrangle tics identified on each image, and a set of subsidary points along the county boundary. The image registration results are listed below in section 2.1.5.1. Following is an excerpt from a U.S. Geological Survey metadata file outlining the processing steps involved in production of a standard DRG product. This information is suppied here in lieu of including all 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 process 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 rectifed images were checked for horizontal accuracy by comparing locations of 7-1/2 minute ticks on the imagery to those in the N.J. Department of Environmental Prpotection (NJDEP) GIS vector coverage of 7-1/2' tiles. The set of images meets the National Map Accuracy Standard (NMAS) for the 1:100,000 scale based on this analysis (not more than 10% of the points tested shall be in error more than 166.67 feet). However, the user is urged to refer to the author's notes in section 9.0 for further discussion pertaining to accuracy of the images. 2.1.5.1 IMAGE REGISTRATION RESULTS 2.1.5.1.1 atlantic.tif Scale (X,Y) = (66.668,66.717) Rotation = 0.249 degrees RMS error (image,cover) = (1.078,71.886) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 425553.053,326603.415 425524.213,326554.754 56.565 2 525699.100,242207.201 525630.545,242238.932 75.542 3 467334.919,173667.999 467307.927,173613.870 60.486 4 355177.774,248453.419 355202.837,248500.252 53.118 5 523789.043,246510.912 523888.366,246535.137 102.235 --------------------------------------------------------- 2.1.5.1.2 bergen.tif Scale (X,Y) = (66.760,66.676) Rotation = 0.347 degrees RMS error (image,cover) = (0.384,25.631) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 571174.448,838122.169 571143.994,838129.963 31.435 2 659493.201,788805.049 659511.454,788800.378 18.841 3 634691.875,715921.405 634674.192,715925.930 18.253 5 554816.263,795936.079 554846.147,795928.431 30.848 --------------------------------------------------------- 2.1.5.1.3 burlington.tif Scale (X,Y) = (66.688,66.705) Rotation = 0.317 degrees RMS error (image,cover) = (0.767,51.156) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 335338.154,422590.243 335318.713,422646.031 59.079 2 467535.560,475130.076 467520.488,475195.123 66.771 3 509794.084,257604.230 509787.797,257671.168 67.233 4 422298.510,470631.387 422308.655,470582.172 50.250 5 492240.921,288369.288 492232.254,288324.160 45.952 6 421930.244,333972.346 421944.832,333950.235 26.490 7 457126.954,379483.275 457141.561,379436.022 49.460 8 387147.881,425199.531 387158.009,425175.464 26.111 --------------------------------------------------------- 2.1.5.1.4 camden.tif Scale (X,Y) = (66.773,66.717) Rotation = 0.551 degrees RMS error (image,cover) = (0.786,52.491) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 386636.448,288606.124 386596.144,288584.434 45.770 4 351856.663,379796.428 351909.990,379786.587 54.227 5 316829.655,380010.213 316802.558,380029.914 33.502 6 335474.359,422678.363 335408.867,422679.338 65.500 7 425659.204,326586.565 425694.134,326574.218 37.048 8 385861.963,282420.231 385816.744,282430.428 46.353 9 405248.009,303977.019 405255.228,304007.052 30.888 10 327098.294,345207.356 327180.931,345190.331 84.373 --------------------------------------------------------- 2.1.5.1.5 capemay.tif Scale (X,Y) = (66.745,66.860) Rotation = 0.156 degrees RMS error (image,cover) = (0.469,31.303) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 384045.165,173238.418 384015.395,173214.128 38.422 4 386020.602,151942.226 386046.735,151982.300 47.843 5 385652.948, 60955.126 385653.342, 60936.722 18.408 6 456840.327,151794.977 456835.400,151790.875 6.411 7 421321.617,106332.540 421306.915,106357.950 29.357 8 421404.473,151878.729 421427.344,151860.040 29.536 --------------------------------------------------------- 2.1.5.1.6 cumberland.tif Scale (X,Y) = (66.680,66.555) Rotation = 0.213 degrees RMS error (image,cover) = (0.755,50.266) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 233956.033,226275.564 233937.752,226243.873 36.586 2 333714.368,268070.707 333704.804,268087.469 19.298 4 391525.671,215476.703 391557.595,215480.889 32.197 5 374922.990,129512.556 374870.119,129469.700 68.059 6 303165.597,136680.515 303214.389,136734.114 72.481 --------------------------------------------------------- 2.1.5.1.7 essex.tif Scale (X,Y) = (66.682,66.799) Rotation = 0.336 degrees RMS error (image,cover) = (0.713,47.567) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 539110.536,755974.304 539067.038,755986.846 45.270 2 594503.358,723830.530 594556.947,723815.077 55.772 3 593059.829,670936.832 593012.706,670950.420 49.043 4 527602.618,694279.165 527639.650,694268.487 38.541 --------------------------------------------------------- 2.1.5.1.8 gloucester.tif Scale (X,Y) = (66.685,66.630) Rotation = 0.378 degrees RMS error (image,cover) = (0.960,63.967) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 4 235050.538,354180.735 235107.001,354202.796 60.619 5 281417.322,334812.233 281342.852,334744.123 100.920 6 312455.882,384894.933 312446.653,384922.565 29.133 7 316149.277,288913.807 316119.161,288948.319 45.805 8 351332.469,288785.443 351405.370,288745.310 83.218 9 355152.349,248519.362 355136.801,248543.400 28.628 --------------------------------------------------------- 2.1.5.1.9 hudson.tif Scale (X,Y) = (66.861,66.812) Rotation = 0.442 degrees RMS error (image,cover) = (0.657,43.914) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 615296.705,662629.677 615344.518,662615.573 49.851 3 589685.519,711592.904 589725.504,711583.644 41.044 6 599586.543,681296.035 599541.084,681267.826 53.500 7 632432.697,718806.639 632416.087,718819.345 20.912 8 592191.246,669477.707 592165.515,669516.574 46.613 --------------------------------------------------------- 2.1.5.1.10 hunterdon.tif Scale (X,Y) = (66.697,66.705) Rotation = 0.337 degrees RMS error (image,cover) = (1.231,82.120) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 402498.941,695464.555 402456.931,695443.103 47.170 2 409479.793,612853.349 409470.820,612857.850 10.039 3 351962.995,573840.739 351850.057,573788.900 124.267 4 300463.508,641231.560 300536.930,641264.677 80.545 5 422905.913,579492.431 422996.413,579528.103 97.276 --------------------------------------------------------- 2.1.5.1.11 mercer.tif Scale (X,Y) = (66.706,66.667) Rotation = 0.282 degrees RMS error (image,cover) = (0.786,52.393) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 3 458082.684,543139.918 458017.828,543092.628 80.267 4 422575.951,561653.076 422565.326,561631.340 24.194 5 492247.791,516004.331 492240.956,516006.646 7.217 6 422414.305,516107.228 422461.354,516090.659 49.882 7 371658.247,548833.604 371603.544,548854.573 58.585 8 467511.996,475231.759 467535.153,475235.406 23.443 9 496558.571,517198.613 496515.523,517238.448 58.652 11 422998.004,579451.657 423043.688,579486.880 57.685 12 455706.020,549241.439 455770.198,549225.046 66.239 --------------------------------------------------------- 2.1.5.1.12 middlesex.tif Scale (X,Y) = (66.753,66.668) Rotation = 0.054 degrees RMS error (image,cover) = (0.875,58.364) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 4 527112.041,561632.724 527058.425,561574.942 78.825 5 526936.476,607044.506 526972.998,607069.907 44.486 6 492189.881,561482.411 492205.809,561529.213 49.437 7 574494.870,641041.211 574503.496,640985.693 56.185 8 487566.804,636578.127 487546.239,636581.221 20.797 9 496428.225,517257.154 496445.243,517210.615 49.553 10 562169.087,573048.950 562165.175,573133.493 84.634 --------------------------------------------------------- 2.1.5.1.13 monmouth.tif Scale (X,Y) = (66.645,66.714) Rotation = 0.329 degrees RMS error (image,cover) = (0.929,61.940) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 4 604853.759,472121.376 604897.864,472124.362 44.206 5 561887.848,561642.217 561877.151,561650.387 13.460 6 597077.004,470660.882 597115.865,470669.934 39.901 7 492239.417,470512.073 492226.303,470479.009 35.570 8 561980.583,516121.978 561960.195,516128.915 21.536 9 638780.728,561057.185 638676.521,561046.490 104.754 10 562328.124,583295.081 562437.016,583289.621 109.028 11 474644.615,493935.546 474601.163,493957.618 48.736 --------------------------------------------------------- 2.1.5.1.14 morris.tif Scale (X,Y) = (66.694,66.695) Rotation = 0.328 degrees RMS error (image,cover) = (0.245,16.322) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 384689.067,712761.861 384679.087,712763.920 10.190 2 494975.269,812175.417 494988.039,812188.821 18.514 4 492222.555,789250.530 492201.976,789230.507 28.712 5 492232.167,698136.394 492233.935,698143.605 7.425 6 423061.530,743784.438 423073.889,743790.278 13.670 7 422937.279,698251.367 422940.938,698242.875 9.247 --------------------------------------------------------- 2.1.5.1.15 ocean.tif Scale (X,Y) = (66.695,66.688) Rotation = 0.343 degrees RMS error (image,cover) = (1.183,78.904) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 2 477199.185,453635.515 477206.637,453690.236 55.227 3 612037.377,457699.292 611981.317,457672.829 61.992 4 525815.623,242231.037 525717.862,242226.144 97.884 6 527228.625,470567.695 527179.851,470499.629 83.736 7 562568.953,288443.465 562642.527,288440.841 73.620 8 527223.835,379465.650 527311.283,379440.608 90.963 9 597256.623,425097.420 597290.744,425169.786 80.006 --------------------------------------------------------- 2.1.5.1.16 passaic.tif Scale (X,Y) = (66.699,66.649) Rotation = 0.317 degrees RMS error (image,cover) = (1.157,77.150) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 529003.403,862902.023 528967.696,862915.593 38.199 2 554856.121,796009.737 554911.026,796003.406 55.269 3 594565.097,723904.250 594598.080,723851.144 62.515 5 560039.503,746049.401 559945.804,746142.276 131.929 6 512773.561,798070.821 512815.079,798023.813 62.717 --------------------------------------------------------- 2.1.5.1.17 salem.tif Scale (X,Y) = (66.638,66.734) Rotation = 0.262 degrees RMS error (image,cover) = (0.304,20.257) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 4 315855.910,243417.858 315855.970,243437.981 20.123 5 210056.488,244375.498 210056.531,244378.113 2.615 6 210543.461,289936.562 210543.394,289932.169 4.393 7 280952.756,289302.421 280952.639,289266.300 36.121 8 234468.979,348012.832 234469.060,348030.608 17.776 --------------------------------------------------------- 2.1.5.1.18 somerset.tif Scale (X,Y) = (66.690,66.697) Rotation = 0.333 degrees RMS error (image,cover) = (0.399,26.625) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 1 429376.446,687325.471 429363.876,687350.309 27.838 2 514238.498,664510.102 514245.907,664495.461 16.408 3 458674.029,561045.901 458663.343,561067.015 23.664 4 409452.955,612840.878 409468.801,612809.566 35.093 --------------------------------------------------------- 2.1.5.1.19 sussex.tif Scale (X,Y) = (66.677,66.753) Rotation = 0.300 degrees RMS error (image,cover) = (1.320,88.073) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 2 439536.117,754222.563 439492.034,754305.242 93.697 3 356602.531,821874.858 356683.104,821820.391 97.255 4 423552.094,880474.817 423491.332,880403.911 93.379 5 457715.181,789261.434 457717.245,789243.826 17.728 6 492193.079,880163.780 492231.130,880299.263 140.725 7 388926.458,834941.387 388891.640,834963.065 41.015 8 457773.944,834832.085 457799.404,834783.246 55.077 9 528949.719,863092.516 528964.804,862978.577 114.934 10 435153.528,917794.911 435131.958,917860.830 69.359 --------------------------------------------------------- 2.1.5.1.20 union.tif Scale (X,Y) = (66.677,66.732) Rotation = 0.215 degrees RMS error (image,cover) = (1.264,84.327) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 4 526916.794,652700.263 526912.194,652643.359 57.089 5 561592.321,652741.742 561627.532,652699.728 54.817 6 574593.296,640967.646 574466.198,641014.652 135.512 7 503599.051,641630.080 503691.237,641667.443 99.470 8 505689.948,663251.175 505611.084,663240.797 79.544 9 527701.839,692443.394 527694.923,692470.942 28.403 10 585969.996,659747.697 586060.078,659745.074 90.120 --------------------------------------------------------- 2.1.5.1.21 warren.tif Scale (X,Y) = (66.623,66.746) Rotation = 0.373 degrees RMS error (image,cover) = (0.793,52.892) Link Evaluation: [In Coverage Coordinates] Link Id Calculated (X,Y) True (X,Y) Distance 2 418084.461,757220.781 418057.431,757216.443 27.376 6 299865.737,645174.463 299921.965,645202.863 62.994 7 306167.058,708801.233 306075.553,708788.226 92.425 8 337006.114,738158.603 337027.412,738117.305 46.466 10 378726.979,805001.813 378747.316,805011.115 22.363 11 366487.624,820291.464 366508.296,820312.404 29.425 ********************************************************* 3. SPATIAL DATA ORGANIZATION INFORMATION 3.1. NAME OF DATA atlantic.tif atlantic.tfw bergen.tif bergen.tfw burlington.tif burlington.tfw camden.tif camden.tfw capemay.tif capemay.tfw cumberland.tif cumberland.tfw essex.tif essex.tfw gloucester.tif gloucester.tfw hudson.tif hudson.tfw hunterdon.tif hunterdon.tfw mercer.tif mercer.tfw middlesex middlesex.tfw monmouth.tif monmouth.tfw morris.tif morris.tfw ocean.tif ocean.tfw passaic.tif passaic.tfw salem.tif salem.tfw somerset.tif somerset.tfw sussex.tif sussex.tfw union.tif union.tfw warren.tif warren.tif 3.1.1 DATA STRUCTURE The TIFF files are 8-bit raster-graphics images that employ a color palette to ensure uniform colors throughout a particular DRG series. All DRG's within a series must have the same RGB value. The world-coordinate reference files (*.tfw) are ASCII text files 3.2. NUMBER OF SPATIAL OBJECTS 21 image files and 21 world-coordinate reference files. ********************************************************* 4. SPATIAL REFERENCE INFORMATION 4.1 COMMON IMAGE PARAMETERS Scale = 1:100,000 Datum = NAD83 Coordinate System = NJ State Plane Units = feet Spheroid = CLARKE 1866 projected to GRS 1980 Projection = Polyconic Zone = 4701 4.2. UNIQUE IMAGE PARAMETERS Boundary xmin ymin xmax ymax atlantic.tif 354806.571 165095.551 550755.138 327018.321 bergen.tif 554193.334 702584.756 659807.455 838240.820 burlington.tif 334317.989 257490.007 524161.681 492626.695 camden.tif 311374.015 282200.818 426557.436 424093.439 capemay.tif 349586.914 29997.804 487586.083 179296.325 cumberland.tif 225822.035 119374.374 392922.707 268938.144 essex.tif 525804.903 670770.070 600018.055 756205.374 gloucester.tif 224960.053 248233.851 386738.348 385538.677 hudson.tif 584249.673 658913.491 634796.423 725640.549 hunterdon.tif 298373.615 548292.353 435918.998 713120.016 mercer.tif 368186.864 474767.751 497729.813 579829.617 middlesex 455275.187 515835.954 574696.238 647472.796 monmouth.tif 459966.682 452959.473 644498.349 608537.147 morris.tif 384306.404 661128.402 557314.396 821197.476 ocean.tif 475813.931 233506.520 632613.870 487881.341 passaic.tif 490613.848 723755.697 601533.484 863222.299 salem.tif 189798.689 189690.543 334011.150 349051.652 somerset.tif 409065.035 560615.419 519782.414 701413.242 sussex.tif 356132.013 752023.922 529289.268 919707.431 union.tif 501845.009 640269.105 593401.766 694522.489 warren.tif 296506.599 640654.246 418584.593 824739.051 ********************************************************* 5. ENTITY AND ATTRIBUTE INFORMATION 5.1. IMAGE PROPERTIES 5.1.1 COMMON IMAGE PROPERTIES Image Format: TIFF Image Type: PSEUDOCOLOR Image Colormap: TRUE Image Compresion: NONE Image Rotated: NONE Image Depth: 1 Image Bands: 1 5.1.2 UNIQUE IMAGE PROPERTIES Number of Number of Pixel Size (FT) Columns Rows DX DY atlantic.tif 2937 2427 66.717 66.717 bergen.tif 1582 2032 66.760 66.760 burlington.tif 2846 3525 66.705 66.705 camden.tif 1725 2125 66.773 66.773 capemay.tif 2064 2233 66.860 66.860 cumberland.tif 2506 2243 66.680 66.680 essex.tif 1111 1279 66.790 66.790 gloucester.tif 2426 2059 66.685 66.685 hudson.tif 756 998 66.681 66.681 hunterdon.tif 2062 2471 66.705 66.705 mercer.tif 1942 1575 66.706 66.706 middlesex 1789 1972 66.753 66.753 monmouth.tif 2766 2332 66.714 66.714 morris.tif 2594 2400 66.695 66.695 ocean.tif 2351 3814 66.695 66.695 passaic.tif 1663 2091 66.699 66.699 salem.tif 2161 2388 66.734 66.734 somerset.tif 1660 2111 66.697 66.697 sussex.tif 2594 2512 66.753 66.753 union.tif 1372 813 66.732 66.732 warren.tif 1829 2758 66.746 66.746 --------------------------------------------------------- 5.2 LIST OF RELATED DATA /data/legalreg/stcoq - NJDEP refence coverage of state county boundaries (NAD27 projected to NAD83) /data/mapgrids/quads86 - NJDEP reference coverage of 7-1/2' quadrangle tiles and tics. (NAD27 projected to NAD83) ********************************************************* 6. DISTRIBUTION INFORMATION Data are available in a number of different formats and media upon request. ********************************************************* 7. METADATA REFERENCE INFORMATION 7.1 PUBLICATION DATE June 5, 1998 7.2 AUTHOR: Gregory C. Herman ********************************************************* 8. AUTHORS NOTES The accuracy check for the set of images is based solely on comparing locations of 7-1/2 minute ticks on the images to those from the NJDEP 7-1/2' tile coverage (quads86 in section 5.2). The location of the county boundaries on the images often depart from the location of their vectorized equavalents (taken from stcoq in section 5.2). The sources for, and nature of, this misalignment are unknown, but misalignment is most pronounced along rivers and streams, and to lesser extents along linear segments of the county boundary. The images are not clipped to the vectorized county boundary. Moreover, the county boundaries showing on the images are preserved in an attempt to optimize alignment of adjacent sets of county images. The user should be aware that topographic elevations on the imagery are mapped in meters whereas image registration uses N.J. State Plane Coordinate feet.