Publications—Open-File Report 99–99
By Gregory E. Granato
U.S. Geological Survey Open-File Report 99–99
Prepared in cooperation with the Federal Highway Administration. A Contribution to the National Highway Runoff Data and Methodology Synthesis.
This report is available in Portable Document Format (PDF):
OFR 99–99 (208 KB) – 44 pages
Table of contents for the disk
A program designed for point location and
calculation of error (PLACER) was developed as
part of the Quality Assurance Program of the
Federal Highway Administration/U.S. Geological
Survey (USGS) National Data and Methodology
Synthesis (NDAMS) review process. The
program provides a standard method to derive
study-site locations from site maps in highwayrunoff,
urban-runoff, and other research reports.
This report provides a guide for using PLACER,
documents methods used to estimate study-site
locations, documents the NDAMS Study-Site
Locator Form, and documents the FORTRAN
code used to implement the method.
PLACER is a simple program that calculates the latitude and longitude coordinates of one or more study sites plotted on a published map and estimates the uncertainty of these calculated coordinates. PLACER calculates the latitude and longitude of each study site by interpolating between the coordinates of known features and the locations of study sites using any consistent, linear, user-defined coordinate system. This program will read data entered from the computer keyboard and(or) from a formatted text file, and will write the results to the computer screen and to a text file. PLACER is readily transferable to different computers and operating systems with few (if any) modifications because it is written in standard FORTRAN. PLACER can be used to calculate study site locations in latitude and longitude, using known map coordinates or features that are identifiable in geographic information data bases such as USGS Geographic Names Information System, which is available on the World Wide Web.
The PLACER computer program
Anatomy of an input/output file
Case 1: Map coordinates
Case 2: Known locations
Appendix 1: Study-site locator form
Appendix 2: FORTRAN code for PLACER
This report is available online in Portable Document Format (PDF). If you do not have the Adobe Acrobat PDF Reader, it is available for free download from Adobe Systems Incorporated.
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Granato, G.E., 1999, Computer program for Point Location and Calculating of ERror (PLACER): U.S. Geological Survey Open File Report 99-99, 36 p.
For additional information write to:
USGS Massachusetts–Rhode Island Water Science Center
10 Bearfoot Road
Northborough, MA 01532
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