[ISO_Topic_Category='IMAGERY/BASE MAPS/EARTH COVER']
Miami-Dade County FL soil mapEntry ID: USGS_SOFIA_mdcsoil
Abstract: The data sets consist of two files, an ARC/INFO shape file with associated files and an export file, of a composite of soil maps for Miami-Dade County, Florida issued by the Soil Conservation Service in April, 1958. The data is at 1:40,000 scale.
Getting geographic information into a form that can be analyzed in a Geographic Information System (GIS) has always been a labor-intensive ... process. Graphic information was historically captured using variations of manual digitizing techniques. Users either digitized directly from printed materials on digitizing tablets or tables or by a variation of heads-up digitizing from scanned graphics displayed on computer monitors. Data collection involves considerable interaction between the user and a computer to capture and manipulate graphical data into a GIS layers. By using inexpensive image processing software to process and manipulate scanned images before processing these images in the GIS, features can be semi-automatically extracted from the scanned graphics, virtually eliminating the process of manual delineation. Common photo editing techniques combined with GIS expertise can dramatically decrease the time required to collect GIS data layers.
The mentioning of specific software brands or registered trademarks does not constitute a commercial endorsement; their mention is done for clarity only. Mention of software products in the description of graphic processing techniques should be viewed as a use of available tools and not a recommendation for a software product.
Data Set Citation
Dataset Originator/Creator: Daniel Sechrist John Jones
Dataset Title: Miami-Dade County FL soil map
Dataset Release Date: 2001
Dataset Release Place: Reston, VA
Dataset Publisher: U.S. Geological Survey
Data Presentation Form: GIS layerOnline Resource: http://sofia.usgs.gov/exchange/jjones/jjones.html
This data set description is a member of a collection. The collection is described in
Start Date: 1947-01-01
Quality All lines in the raster file created by scanning the paper maps were inspected for connectivity. Broken line segments resulting from dashed line symbology in the source maps were connected as necessary. The data are topologically clean.
Access Constraints None
Use Constraints None.
Techniques described in the process description should be viewed as suggestions only. Because source graphics vary in color and quality and because scanners vary between manufacturers, it is highly unlikely that the techniques described will achieve the same results in all circumstances. This project will however, describe several basic tools and ... techniques to use these tools that, with some trial and error and experimentation, will improve productivity.
This documentation describes methods used to collect linear map features. The same commercial products could be used to collect polygon features. However, some different tools and techniques would be used. Polygon delineation, though obviously important, will not be described here.
The methods used to complete this project were developed out of necessity. Time constraints imposed on the data collection process mandated that innovative solutions be developed in order to meet these time constraints.
Data Set Progress
Distribution Size: 5
Distribution Format: ARC/INFO shape file
Role: TECHNICAL CONTACT
Email: jwjones at usgs.gov
U.S. Geological Survey 12201 Sunrise Valley Drive MS 521
Province or State: VA
Postal Code: 20192
Role: DIF AUTHOR
Email: alicia.m.aleman at nasa.gov
Goddard Space Flight Center Code 610.2
Province or State: MD
Postal Code: 20771
U.S. Department of Agriculture Soil Conservation Service, University of Florida Agricultural Experiment Station, 1958, Dade County Florida, report, Soil Survey (Detailed-Reconnaisance), Series 1947, No. 4, Washington, DC, U.S. Department of Agriculture Soil Conservation Service
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2009-05-20
Last DIF Revision Date: 2013-12-04