Data Series 860

Baseline Coastal Oblique Aerial Photographs Collected from Dauphin Island, Alabama, to Breton Island, Louisiana, August 8, 2012

Navigation Data

Home | Abbreviations | Contents | Photos and Maps | Navigation Data | Logs | Metadata | Index

Navigation files were extracted as a comma-delimited American Standard Code for Information Interchange (ASCII) text file from a Garmin GPSMAP 60CSx. For each trackpoint, the Garmin GPSMAP 60CSx recorded the following: latitude, longitude, date/time, altitude, depth, leg length, leg time, leg speed, and leg course.

The images were acquired using a Canon EOS Rebel T2i. The camera was synchornized to UTM and the time of capture recorded in the EXIF header of each image. Image files are named according to the time they were captured. The image file name has the format yyyy_mmdd_hhmmssd.jpg. (For example, image 2012_0808_133636d.jpg was taken August 08, 2012, at 13:36:36 Universal Time Coordinated (UTC), while "d" designates a digital camera was used.) Images are associated with GPS positions according to the time of capture, with verification using Google Earth to view selected images during the flight based on their time of capture compared to the recorded position of the aircraft at that time in the GPS record.

Processed Navigation

The processed navigation file can be accessed from within the nav folder or by clicking the following link: 12cch02.csv (CSV file). The file contains 12 fields that are defined as follows:

Field 1: LONGITUDE - estimated longitude (decimal degree) position of aircraft
Field 2: LATITUDE - estimated latitude (decimal degree) position of aircraft
Field 3: HR_MIN_SEC - hour_minute_second (UTC)
Field 4: IMAGE - image filename (year_monthday_hhmmssd.jpg)
Field 5: IMAGE_URL - internal to data series location of the image
Field 6: CONTACT_SHEET_URL - internal to data series location of the contact sheet
Field 7: YEAR - year the photo was taken
Field 8: MONTH - month the photo was taken
Field 9: DAY - day the photo was taken
Field 10: PRE_POST - type of survey conducted (pre- or post-storm)
Field 11: STORM - (baseline or name of the storm)
Field 12: GEO_AREA - locations surveyed

Raw Navigation

The raw navigation files can be accessed from within the nav folder or by clicking the following link: 12cch02_0808_gpsmap.txt (text file). The file contains nine fields separated by a space that are defined as follows:

Field 1: HEADER: "Trackpoint"
Field 2: POSITION - latitude (N (North) degrees, decimal minutes), longitude (W (West) degrees, decimal minutes) position of aircraft
Field 3: TIME - Date and Time (m/d/yy hh:mm:ss am/pm)
Field 4: ALTITUDE (feet)
Field 5: DEPTH - blank
Field 6: LEG LENGTH (feet)
Field 7: LEG TIME (hh:mm:ss)
Field 8: LEG SPEED (mph)
Field 9: LEG COURSE (degrees "true")

Home | Abbreviations | Contents | Photos and Maps | Navigation Data | Logs | Metadata | Index

Accessibility FOIA Privacy Policies and Notices

U.S. Department of the Interior | U.S. Geological Survey
URL: http://pubsdata.usgs.gov/pubs/ds/0860/html/ds860_nav.html
Page Contact Information: GS Pubs Web Contact
Page Last Modified: Monday, 28-Nov-2016 19:32:21 EST