New Jersey Geological Survey DGS98-4 A 30-second State Plane Coordinate Grid for New Jersey METADATA 1. IDENTIFICATION INFORMATION 1.1. CITATION A 30-second State Plane Coordinate Grid for New Jersey By G.C. Herman N.J. Geological Survey Digital Geodata Series DGS98-4 1.2. DESCRIPTION 1.2.1 ABSTRACT A 30-second grid covering New Jersey was generated using the ARC/INFO Geographic Information System (GIS). The grid was created and built as a tool for georegistering page size (8.5" x 11") field sheets using a GIS. The grid was generated as a geographic grid then projected to the 1983 North American Datum in State Plane Coordinate Feet. The grid was built solely as a line coverage and updated with line attributes indicating the value of each arc segment in degrees, minutes, and seconds (for example, 743000 equals 74 degrees, 30 minutes, and 00 seconds). A set of coordinate registration points (tics) covering New Jersey were generated at each latitudinal and longitudinal intersection point. Tic locations were compared to corresponding tics from the NJDEP 7-1/2' quadrangle theme to check grid accuracy. The comparison of 138 tic locations showed no spatial deviation between coverages to the nearest tenth of a foot. 1.2.2. LIST OF DIRECTORIES AND BRIEF DESCRIPTION nj30s83 - ARC/INFO Version 7.0.4 Geographic Information System (GIS)line coverage of a 30-second grid covering New Jersey in NAD83 State Plane Coordinate Feet 1.2.3. LIST OF FILES AND BRIEF DESCRIPTION nj30s83.e00 (14.98MB) - ARC/INFO (ver. 7.0.4) uncompressed export file (ASCII text) of the nj30s83 coverage 1.2.4. LIST OF KEYWORDS AND PHRASES geographic grid, State Plane Coordinate grid, 30 second grid, registration tics 1.3. GEOGRAPHIC EXTENT The State of New Jersey 1.4. CONTACTS INFORMATION Gregory C. Herman N.J. Dept. Environmental Protection (NJDEP) Division of Science & Research N.J. Geological Survey (NJGS) 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 nj30s83 2.1.1 DESCRIPTION OF THE TYPE OF DATA ARC/INFO (v.7.0.4) GIS line coverages containing vectors with arc-node topology and related attributes 2.1.2 DATA SOURCE All GIS data in this directory were generated and processed using the ARC/INFO Version 7.0.4 suite of software produced by Environmental Systems Research Institute, Inc. 2.1.3. DATA ORGANIZERS Data generated and compiled by G.C. Herman. 2.1.4. DATE OF COMPLETION February 05, 1998 2.1.5. DATA AUTOMATION AND ACCURACY A 30 second geographic grid was generated for the New Jersey region using a grid origin located at the intersection point of the standard set of parallels for the New Jersey State Plane Coordinate System (Barker, 1990). This required generating two separate grids covering the western and eastern parts of the State, then appending them into a single grid. The following sets of ARC/INFO parameters were used for generating the grids: fishnet Origin Coordinate (X,Y): 74.5,38.5 Y_Axis Coordinate (X,Y): 74.5,41.5 (western grid) cell size (Width, Height): .008333335,.008333335 number of cells 180, 360 (Width, Height) (eastern grid) cell size (Width, Height): -.008333335,.008333335 number of cells 180, 360 (Width, Height) The combined grid was projected into the 1983 North American Datum (NAD83) using State Plane Coordinate Feet, built as a line coverage and edited to remove all arcs beyond the set of 30-second tiles covering the State's boundary as defined by the NJDEP GIS coverage /data/legalreg/stateq. A point coverage was then generated from the set of nodes (arc intersections)in the grid coverage using the ARC/INFO command. The point coverage was ungenerated and then regenerated as a new tic coverage. The tics were then copied into the grid coverage so the tics would coincide with the locations of 30-second arc intersections. The accuracy of the new grid was evaluated by comparing the locations of 138 tics from the new grid to coincident tics from the NJDEP coverage /data/mapgrids/quad91. The comparison resulted in a Root-Mean-Square error deviation of 0.0 for positional accuracy to the nearest tenth of foot. ********************************************************* 3. SPATIAL DATA ORGANIZATION INFORMATION 3.1. NAME OF DATA nj30s83 3.1.1 DATA STRUCTURE Vector data with arc-node topology. Spatial objects include arcs, labels, tics, and nodes with x,y coordinates. 3.1.2. NUMBER OF SPATIAL OBJECTS nj30s83 contains 63,395 arcs and 32,023 nodes and tics. ********************************************************* 4. SPATIAL REFERENCE INFORMATION 4.1 DATA PARAMETERS Scale = 1:4,800 Datum = NAD83 Coordinate System = NJ State Plane Units = feet Projection = Polyconic Zone = 4701 4.2. MAPEXTENT xmin = 191647.188 ymin = 33632.395 xmax = 660112.625 ymax = 919820.438 ********************************************************* 5. ENTITY AND ATTRIBUTE INFORMATION 5.1. NAME OF DIGITAL DATA njspc30s 5.1.1 ITEMS AND ATTRIBUTES (arcs and tics) 5.1.1.1 ARCS (NJ30S83.AAT) COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 4 12 F 3 21 NJ30S83# 4 5 B - 25 NJ30S83-ID 4 5 B - 29 VALUE 6 7 I - note: FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, NJ30S83#, and NJ30S83-ID are default system variables. VALUE is a user-specific variable used for labeling lines denoting latitudinal and longitudinal values in degrees (DD), minutes (MM), seconds (SS). 5.1.1.2 TICS (NJ30S83.TIC) COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC 1 IDTIC 4 5 B - 5 XTIC 12 F 3 - 9 YTIC 12 F 3 - note: all items are system default variables ********************************************************* 6. DISTRIBUTION INFORMATION Data are available in a number of different formats and media upon request. ********************************************************* 7. METADATA REFERENCE INFORMATION 7.1 PUBLICATION DATE February 2, 1998 7.2 AUTHOR Gregory C. Herman ********************************************************* 8. PUBLISHED REFERENCES Barker, H.A., 1990, Mapping digest for New Jersey: N.J. Geological Survey Geological Survey Report GSR 23, 30 p.