John Watermolen Unknown Unknown 1 map N/A N/A http://water.usgs.gov/lookup/getspatial?mex_stateboundaries This data set represents the state (political) boundaries of Mexico. The Digitial Chart of the World data set had incomplete state boundaries, which was the reason to create this coverage. It was digitized from a 1992 CIA map at a scale of 1:3 million. The coast line came from the Digital Chart of the world at a scale of 1:1 million. The state names were labeled from the map and an attribute to help fill the states was added. The labeling process was done manually. The purpose of this state is to fill a need for the state boundaries for all of Mexico. It was collected for the National Atlas project with the intentions to be released to the USGS and be used in reports and on maps that show all or part of Mexico. 19971031 0900 Date represents the state boundaries in 1992 Complete Additional attributes may be added as needed. -119.31029533 -85.1611863 33.98376034 12.54949569 None State Boundaries inlandWaters None Mexico N/A N/A N/A N/A Public These data should be used at 3.5 million scale or smaller USGS John Watermolen Cartographer mailing and physical address

505 Science Dr

Madison WI 53711-1061 USA 1-888-275-8747 N/A (608) 238-9334 jmwater@usgs.gov 700 - 1700 Contact the CAPP CHIEF for Data requests http://water.usgs.gov/GIS/browse/mex_stateboundaries.gif Illlustration of data set GIF John Watermolen was the lead person in creating this coverage. He received assistance from David McCulloch and Greg Allord along with others who are working on the National Atlas None Unclassified N/A dgux, 5.4R3.10, AViion UNIX, ARC/INFO v 7.0.4 The attributes were cross checked by creating a plot with the state names.The islands are not labels to the states. Some state names were verified by people who are from Mexico (Veracruz for example). Polygon and chain-node topolgy present. Each polygon is closed and has one label point. 100% There was no generalization to the data set except the tolerances used in digitizing. Those tolerance are 0.005", the data were orginally digitized in digitizer units. Each attribute is located within its polygon. N/A John Watermolen Unknown Rev 1.0 map Open File Report XXXX Madison, WI USGS None http://water.usgs.gov/lookup/getspatial?mex_stateboundaries 3,000,000 Paper Map 1992 CIA published map, 1992 CIA CIA provided the original map that was used in digitizing. To produce this data set, I went first to the Map and Air photo Library on the UW-Madison campus and found a map at 1:3,000,000 map of Mexico created by the Central Intelligence Agency. I choose 6 latitude and longitude points for tic referneces. Then using an aml called create.aml I created an empty coverage using the 6 lat/long values I picked. I then ran another aml called digitize that sets up the digitizer with tolerances and allows me to digitize. Here is the digitize aml: ae &watch extent.wat &append coordinate digitizer org_data &pause write down rms error &s goof [response 'Is rms error ok (less than .004)?'] &if %goof% = n &then &call abort editcover org_data de arcs ef arcs display 4208 draw weedtolerance .005 snapping closest .005 snapcover org_data ia all add save &do &while [query 'Do you wish to continue digitizing'] add save &end q &watch &off &type all done with digitizing session &return &routine abort &type 'RMS to high need to start over, make sure to type &watch &off' &type 'and cd back to the aml directory, before starting again.' &stop The digitized coverage was in digitizer units and called org_data. After digitizing, I plotted the coverage on our calcomp electrostatic plotter and checked for gaps between the data source and the digitized line. Where there was a gap greater than a line weight it was corrected. The coverages was then transformed to a labert projection using the following standards: projection lambert units meters parameters 19 00 00 29 20 00 -96 00 00 13 00 00 0.0 0.0 The transformation used 5 of the 6 tics with and RMS error of .005 input and 366 meters output. Then the coverage was projected to albers using the following projection file: INPUT PROJECTION LAMBERT UNITS meters PARAMETERS 19 00 00 29 20 00 -96 00 00 13 00 00 0.0 0.0 OUTPUT PROJECTION ALBERS UNITS METERS PARAMETERS 29 30 00 45 30 00 -96 00 00 23 00 00 end After the coverage was projected into albers it was then put into a coverage consisting of the outline of Mexico. This outline came from the Digital Chart of the World (DCW). This coverage was tiled together by David McCulloch of the Florida District Suboffice in Tampa, Fl. After the digitized state lines were put into the outline coverage to create the mexico coverage, all dangles were then edited. Due to an oversight by me (John Watermolen) during an edit session the precision of the coverage went from double to single. Before Documentation I did the following steps to return the coverage to double precision: rename <coverage> <coverage_s> copy <coverage_s> <coverage> double kill <coverage_s> all Once in final form, I then built the coverage for arc and polygon topology. After this I then added the state name and differentiated the boundaries into the following catagories: Boundary = 1 is the coastline Boundary = 5 is state boundaries Boundary = 10 is International boundaries There is a watch file called mexico.wat that has a history of the creation of the data set. I deleted the actual digitizing points and editing points to make the watch file more manageable. The watch file is in the notes section of this narrative. Here is a lineage of the coverages that led to Mexico: org_data- original digitized datset in digitizer units mexico_lam - is the transformed coverage form digitizer units to lambert projection. mex_alb- is the albers projection from the lambert projection Other files and coverages used to create the files: west_hem- outline from the DCW mexico_ll, mexico_ll2 and mexico_ll3 are projection and ascii files used to help transform the coverage from digitizer units to a projected coverage. The data was reviewed by John Hutchinson of the Eros Data Center and by David McCulloch of the USGS-WRD Florida District Tampa office On June 4th I made 2 additions to the data set that were noted in the metadata review along with the review of the data. I added Isla Montagua, which was deleted from the DCW coastline and I added Cabo Rojo which was over generalized in the DCW coastline. My RMS error for the digitizing session .002"/160 m Unknown 19971210 Unknown DOI-USGS-WRD-CAPP CAPP Chief Chief mailing and physical address

505 Science Dr

Madison WI 53711-1061 USA 1-888-275-8747 (608) 238-9334 0700 to 1600 0 (no cloud cover-no air photo) Vector Point 281 String 373 GT-polygon composed of chains 282 Albers Conical Equal Area 1st parallel: 29 30 00 degrees North 2nd parallel: 45 30 00 degrees North 96 degrees West 23 degrees North 0.0 0.0 coordinate pair 1.0 1.0 meters NAD 27 Clarke 1866 6378206.4 294.98 Mexico.pat describes the polygon attributes arc/info and CIA map source There are 2 attribute tables. One for the arcs and one for the polygons. The items for the arcs that are not internal to ARC/INFO are: Boundary- which describes the differnet types of boundaries identified in the coverage. The codes are: Boundary = 1 is the coastline Boundary = 5 are the state boundaries Boundary = 10 are the international boundaries The items for polygons not internal to ARC/INFO are: Fill and State Name. The codes for Fill are: fill = y polygon should be filled fill = n polygon shouldn't be filled For state name, it is a characater string. If this field is blank, the polygon represents an island Boundary- which describes the differnet types of boundaries identified in the coverage. The codes are: Boundary = 1 is the coastline Boundary = 5 are the state boundaries Boundary = 10 are the international boundaries The items for polygons not internal to ARC/INFO are: Fill and State Name. The codes for Fill are: fill = y polygon should be filled fill = n polygon shouldn't be filled For state name, it is a charcater string. If this field is blank, the polygons represents an island U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Export Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/mex_stateboundaries.e00.gz Other DLG file format zipped 1 http://water.usgs.gov/GIS/dsdl/mex_stateboundaries_dlg.gz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+mex_stateboundaries FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998