International Boundary and Water Commission, United States and Mexico 2011 2010 vector digital data http://www.ibwc.gov This provisional international boundary was developed by the International Boundary and Water Commission-United States and Mexico (IBWC), to be used as a common boundary for the clipping and geometric integration of binational geospatial data sets and represents the international boundary as agreed upon by the Governments of the United States and Mexico in accordance with the 1970 Boundary Treaty. It provides an electronic, spatially referenced representation of the international boundary that may be used for the purposes of displaying the boundary and to integrate binational datasets tied into the boundary line. This dataset was created to provide resource managers, public officials, researchers, and the general public with ready access to the location of the international boundary for use to develop binational datasets that depict various land use/land cover datasets including resource utilization, environmental quality, and human health. Additional information about the IBWC can be found at http://www.ibwc.gov and datasets are available for viewing through Internet mapping Service (follow the links on the main IBWC page to the Internet Mapping Service Viewer). ground condition 2009 In work None planned -117.122670 -96.924269 32.718749 25.837053 None Library of Congress International Boundary IBWC Minute No. 1970 Boundary Treaty ISO 19115 Topic Categories Boundaries None US Mexico border region United States of America Mexico Colorado River Rio Grande River Rio Colorado Rio Bravo None Accuracy of the data is not guaranteed. Users should be aware that temporal changes might have occurred since these data were collected and that some parts of the data might no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgment of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data is obligated to describe the modifications made. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the IBWC. Please refer to <http://www.ibwc.gov/> for the U.S. IBWC general disclaimer. GIS Manager 915-832-4702 915-832-4167 Delbert.Humberson@ibwc.gov mailing and physical address

4171 North Mesa, C-100

El Paso Texas 79902 USA 08:00-16:30 Delbert Humberson International Boundary and Water Commission Credit for the completion of the international boundary line should be given to the International Boundary and Water Commission, United States and Mexico. Cooperating agencies include the National Institute of Geography and Statistics, Mexico, and the U.S. Geological Survey. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000 The line feature class was visually examined for disconnected portions. The individual line shapefiles were snapped together using GIS software and visually examined to ensure there were no gaps. The line shapefile was compared to orthoimagery as a visual check for consistency. International Boundary and Water Commission, United States and Mexico Unpublished Material digital data http://www.ibwc.gov Point of contact for the monument points is Mr. Delbert Humberson, IBWC. Internal IBWC Document 2009 ground condition Monuments Surveyed monument points were joined to create the international boundary from the west coast of North America to the Rio Grande River portion of the boundary, excluding the Colorado River area of the international boundary. Monument positions were provided by the IBWC, http://www.ibwc.gov. International Boundary and Water Commission, United States and Mexico 20091119 http://www.ibwc.gov vector digital data Point of contact for the Colorado Boundary is Mr. Delbert Humberson, IBWC. Internal IBWC Document 2008 ground condition Provides that portion of the international boundary line which coincides with the Colorado River. This international boundary for the Colorado dataset was developed by the International Boundary and Water Commission-United States and Mexico (IBWC)(http://www.ibwc.state.gov), to be used as a common boundary for the clipping and geometric integration of binational geospatial datasets and represents the international boundary as agreed upon by the Governments of the United States and Mexico in accordance with the 1970 Boundary Treaty. It provides an electronic, spatially referenced representation of the boundary that can be used by resource agencies for the purposes of displaying the international reach of the Colorado River and to integrate binational datasets tied into the boundary line. Colorado River boundary U.S. Geological Survey Unknown http://borderhealth.cr.usgs.gov vector digital data online 2004 ground condition Rio Grande boundary line Provides that portion of the international boundary which coincides with the Rio Grande river. The center of the Rio Grande/Rio Bravo River was digitized using digital orthophoto quadrangles (DOQ) created from aerial imagery acquired in 2004 and 2005. The DOQs are 1-meter pixel resolution, natural color, with 5-meter horizontal accuracy. The IBWC 1989 boundary maps of the Rio Grande were also used as reference during processing. The 1989 boundary maps of the Rio Grande can be found at the Perry Castaneda Library Map Collection, website link: http://www.lib.utexas.edu/maps/us_mexico_border/index.html . International Boundary and Water Commission, United States and Mexico 19701212 Unknown map Signed by the Commissioner of the United States and Commissioner of Mexico. Provided by the IBWC. paper 1970 publication date Maritime Boundary map Provided coordinate values for extension of boundary line into the Pacific Ocean. Combined border: All source shapefiles were converted to Geographic coordinate system, NAD83. Monument points in shapefile format were separated into two shapefiles using ArcToolBox Select tool, one shapefile for points west of the Colorado River, and the other for points east of the Colorado River. The individual points were connected within each shapefile and converted into line geodatabase feature classes using Safe Software FME Point Connector transformer. All portions of the boundary line were combined using FME Aggregator transformer. The combined line was then processed through the FME Snapper transformer, using a snapping tolerance of 0.02 decimal degrees. This connected the geometry of the line portions and closed the gaps between them. The boundary line on the west coast ends approximately 150 meters east of the coastline at the westernmost monument point. The line was extended to the approximate coastline and into the Pacific Ocean using ArcGIS. The completed boundary feature class was converted to ESRI shapefile format using FME. Attribute fields derived from the USGS National Boundaries Dataset were retained. Laurie Temple U.S. Geological Survey, National Geospatial Technical Operations Center Cartographer mailing address

PO Box 25046, MS 510, DFC

Denver Colorado 80225 USA 303-202-4485 303-202-4504 ldtemple@usgs.gov Safe Software Feature Manipulation Engine (FME), version 2010 201102 Metadata imported. 20100823 17135900 Metadata imported. 20110210 12094100 Errors, as much as 5 meters, might have resulted from error present in digital orthophotos used to digitize the international boundary along the Rio Grande/Rio Bravo River. Errors of unknown magnitude might have been introduced in areas where the determination of the location of the channel of the Rio Grande/Rio Bravo was difficult, for example, in dense salt cedar stands. Errors, as much as 5 meters, might have resulted from error present in digital orthophotos used to digitize the international boundary along the Colorado River. This representation of the international boundary between US and Mexico is a vector digital line compiled from three separate boundary sources. These sources include a shapefile boundary line for the Colorado River, a shapefile boundary line for the Rio Grande/Rio Bravo River and a shapefile of monument points for remaining areas of the border. The compiled line extends from the mouth of the Rio Grande River to the approximate coastline on the west edge of the US/Mexico border and into the Pacific Ocean. Monument points used to create the western portion of the boundary end just east of the actual coastline, therefore, the line was extended in ESRI ArcGIS software to the approximate edge of the coastline from the westernmost monument point and into the Pacific Ocean based on the IBWC published International Maritime Boundary map of December 12, 1970. GCS_North_American_1983 0.000458 0.000458 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 US_Mex_Boundary Provisional_2009_US_Mexico_International_Boundary International Boundary and Water Commission, United States and Mexico FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. Length_km Length of the feature which may differ from the field measured length due to differences in calculation. Units are in kilometers, and are based on the North America Lambert Conformal Conic (NAD83) projection. IBWC Range Domain Delbert Humberson U.S. International Boundary and Water Commission Geographer mailing and physical address El Paso Texas USA 79902 915-832-4160 915-832-4167 Delbert.Humberson@ibwc.gov The data are released on the condition that neither the USIBWC, its cooperators, nor the U. S. Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the IBWC, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Shapefile 0.648 file://\\IGSKBTHIWS040\D\US_Mex_Boundary_2010_FromAustin\US_MEX_BDY_2010_NAD83.shp\Provisional_2010_US_Mexico_International_Boundary.shp The International Boundary and Water Commission, United States and Mexico does not charge a fee for this data. Downloadable Data 20110210 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time Laurie Temple U.S. Geological Survey, National Geospaital Technical Operations Center Cartographer mailing address

P.O. Box 25046, MS 510, DFC

Denver Colorado 80225-0046 US 303-202-4485 303-202-4504 ldtemple@usgs.gov