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Contents lists available at ScienceDirect
Computers & Geosciences
journal homepage: www.elsevier.com/locate/cageo
SedLog: A shareware program for drawing graphic logs and
log data manipulation$
Dimitrios Zervas a,c, Gary J. Nichols a,b, Robert Hall a, Helen R. Smyth a,
Charlotta Lüthje b, Fionn Murtagh c,
a
Department of Earth Sciences, Royal Holloway, University of London, Egham TW20 0EX, UK
University Centre on Svalbard, PO Box 156, Longyearbyen N9170, Norway
c
Department of Computer Science, Royal Holloway, University of London, Egham TW20 0EX, UK
b
a r t i c l e in fo
abstract
Article history:
Received 24 December 2008
Received in revised form
14 February 2009
Accepted 17 February 2009
SedLog is a free multi-platform software package for creating graphic sediment logs providing an
intuitive graphical user interface. The graphic sediment logs generated by SedLog can be exported as
PDF, Scalable Vector Graphics (SVG), or JPEG for use by other drawing applications or for publications.
Log data can be imported and exported in Comma Separated Values (CSV) format. The logs can also be
printed to any paper size the user wants. Zoom In, Zoom Out, Fit page, Fit Height and Fit Width facilities
are also provided to enable the user to customise the workspace size.
& 2009 Elsevier Ltd. All rights reserved.
Keywords:
Sedimentology
Log
Lithology
Software
Java
Graphics
1. Introduction
The graphic sedimentary log is the standard method used by
geologists to present data from successions of rocks (Collinson
et al., 2006). These successions may be from cliffs or quarry faces
where rocks are exposed, or in core drilled through layers of rocks
in the subsurface. From each bed data are recorded and
summarised in a largely diagrammatic format to create a
representation of the strata in a form that can easily be related
to the bed characteristics. The thickness of the bed is measured,
the lithology determined (sandstone, mudstone, limestone, etc.),
the presence of any structures, such as ripple marks, noted and
other features such as the fossil content recorded. This information is presented on the graphic log using a vertical scale for the
bed thickness, patterns to represent different lithologies (‘dots’ for
sandstone, ‘bricks’ for limestone and so on) and symbols to
illustrate structures and fossils. Other data that may be recorded
and indicated on the log may include other features such as
colour, the locations where rock samples have been taken or other
$
Latest version of SedLog can be downloaded from www.sedlog.com, a site
hosted by Royal Holloway University of London.
Corresponding author. Fax: +44 1784 439786.
E-mail address: fmurtagh@acm.org (F. Murtagh).
0098-3004/$ - see front matter & 2009 Elsevier Ltd. All rights reserved.
doi:10.1016/j.cageo.2009.02.009
specific information from different points in the succession. Logs
may be used to compare strata between different areas and data
may be extracted from the log to analyse trends in bed thickness,
distribution of lithologies or other features. They can be drawn in
the field as summary sketch logs, or on log sheets that contain all
the data from the succession and later drawn up in a neater form
for reports or publications (Tucker, 2003; Stow, 2005; Collinson
et al., 2006). Although they are most commonly used by
sedimentologists, they are widely used by geologists working in
many other fields, such as volcanology, igneous petrology and
palaeontology.
Logs were originally hand-drawn, but with the advent of
graphical drawing packages it is now usual for logs presented in
commercial reports and scientific publications to be images
generated by computer graphics. Whilst these can provide a
satisfactory representation of the information, the actual data is
not recorded in any form that can be analysed in any numerical
way. For example, any statistical analysis of trends in bed
thickness or the distribution of different lithologies would require
returning to the original data set to access the numerical
information. A further drawback of logs presented only as pictures
is that if substantial changes need to be made, such as using a
different vertical scale, the log may need to be almost completely
re-drawn. Computer-drawn logs, therefore, offer little advantage
over their hand-drawn predecessors—they are just neater.
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Some software packages are available, e.g. WinLoG1 or
LogPlot 72 that can use a database of information to generate
sedimentary logs, either as stand-alone utilities or as parts of
larger, integrated suites. Not all are well-suited to the needs of all
geologists: in some cases, the data input is not straightforward, as
parameters may need to be defined at the outset, and output may
not have the desired flexibility. The greatest obstacle to the
widespread use of many of these packages is, however, their cost:
even if some of the packages can satisfy many of the requirements
for input and presentation of sedimentological data, they are not
readily available and affordable for use by students and others
without the resources to purchase the software licences.
This problem was recognised by Hoelzel (2004) who described
a program, based on CorelDraw, to draw logs while we were
developing the software described in this paper. Here we present
SedLog, a user friendly multi-platform software written in Java for
creating graphic sedimentary logs. We had similar aims to Hoelzel
(2004), but chose to make our application as complete as possible
without any need for other software. SedLog can draw logs by
dragging and dropping, and also has a full range of patterns and
many other attributes built in. The graphic sedimentary logs
produced by SedLog can be printed directly from the screen or
exported as vector images to other graphics packages. All data can
also be output to spreadsheets (CSV file format) for statistical
analysis or export into other packages that handle sedimentological or stratigraphic information. Data in spreadsheet format
can be imported into SedLog and can be used as the basis
for drawing a graphic log. The program is available free from
www.sedlog.com.
2. Development
Our objectives in developing the software for graphic sedimentary logs were as follows:
1. The graphic log output should closely resemble the formats
commonly used by geologists in publications.
2. The layout, patterns and symbols used in creating the graphic
log should be flexible enough to accommodate the different
layouts and conventions used by sedimentologists and others.
3. Graphical output should be importable into graphics software
packages to allow final modifications to the appearance of the
output.
4. All the data about each bed should be stored in ASCII format to
permit export of the data to other packages or for statistical
analysis to be carried out.
5. Data in ASCII format should be importable into the program
and used to generate graphic logs.
6. The program should be relatively self-explanatory, such that a
new user could input data and generate logs in a simple format
without requiring reference to an instruction manual.
7. The program should be freely available.
One option for a Graphical User Interface (GUI) and graphics
intensive application is Borland C++ Builder because of its strong
GUI design facilities and the speed of the C++ language. We
selected, however, Java3 for its cross-platform operability. Java is a
programming language originally developed by Sun Microsystems
and released in 1995. The language derives much of its syntax
1
WinLoG Version 4, http://www.gaea.ca, 2007, from GAEA Technologies
(Whitby, Ontario, Canada).
2
LogPlot Version 7, http://www.rockware.com, 2007, from RockWare Inc.
(Golden, Colorado, USA).
3
Java official web page: http://www.java.com.
from C and C++ but has a simpler object model and fewer
low-level facilities. Java applications are typically compiled to
bytecode which can run on any Java virtual machine (JVM)
regardless of computer architecture. Java also provided the Java
2D Application Programming Interface (API). Java 2D API is a set of
Java classes for advanced 2D graphics and imaging. It encompasses line art, text and images in a single comprehensive model.
Using Java 2D avoided a lot of low-level graphics programming,
minimized development time and aided debugging of the
application. For Java development, we initially used Borland’s
JBuilder 2005 foundation but in the latest version of SedLog we
used the NetBeans IDE4 instead. NetBeans IDE is a free, opensource Integrated Development Environment (IDE) for Java software development and runs on Windows, Linux, Mac OS X and
Solaris. The NetBeans IDE provides a GUI Builder which enables
intuitive GUI design by dragging and dropping GUI components
from a palette onto a canvas, which can then be clicked and edited
in place.
To store and draw lithology patterns and symbols we needed a
suitable file format, either: (a) as a raster graphics image or
bitmap or (b) as a vector graphics image. Bitmaps are matrices of
pixels and appear jagged when rescaled or printed. Vector
graphics use geometrical primitives such as points, lines,
curves and polygons to represent images and continue to look
the same when rescaled or printed. Naturally, we decided to
store patterns and symbols in vector file format but developing a
parser for a vector file format from scratch would have been a
major task. So, we used the Scalable Vector Graphics (SVG)
file format and the Batik5 free library for parsing them instead
of writing our own parser. SVG is an XML specification and
file format for describing two-dimensional vector graphics, both
static and animated. It is an open standard created by the
World Wide Web Consortium’s SVG Working Group. Batik is a
pure-Java library that can be used to render, generate and
manipulate SVG graphics.
For exporting the logs to PDF, we used the iText6 library
(Lowagie and Soares, 2007) which is an open-source library for
creating and manipulating PDF, RTF and HTML (respectively,
Portable Document Format, from Adobe; Rich Text Format, from
Microsoft; and Hypertext Markup Language) files in Java, and is
distributed under the Mozilla Public Licence with the LGPL (GNU
Library General Public Licence) as alternative licence.
We started development by creating a simple prototype which
took about 3 months. Then, we gave the prototype to various users
and we started adding features and modifying it according to their
comments.
3. SedLog description
SedLog provides an intuitive graphical user interface, making it
very easy for anyone to use with minimum effort. The graphic
sediment logs generated by SedLog can be exported as PDF, SVG,
or Joint Photographic Experts Group (JPEG, for bitmapped images)
for use by other drawing applications or for publications. Log data
can be imported and exported in CSV format. Comma separated
values (CSV) files store tabular data and can be generated and
imported by any spreadsheet application (such as MS Excel, MS
Works Spreadsheet, StarOffice Calc, Quattro Pro, etc.). The CSV file
4
NetBeans Integrated Development Environment (IDE) for Java software
development official web page: http://www.netbeans.org/.
5
Batik free Java library used to render, generate, and manipulate SVG graphics
official web page: http://xmlgraphics.apache.org/batik.
6
B. Lowagie and P. Soares, iText (software), release 2.0.7, Nov. 28, 2007,
1999–2007, http://www.lowagie.com/iText.
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format does not require a specific character encoding, byte order,
or line terminator format making it platform independent. Below
is a sample CSV file opened by a text editor:
pertaining to a bed can be edited subsequently. On the input page,
a series of drop-down menus provide options for recording
information about the bed. These include:
‘‘THICKNESS (CM)’’,‘‘BASE BOUNDARY’’,‘‘LITHOLOGY’’,‘‘LITHOLOGY %’’,‘‘GRAIN SIZE BASE’’,‘‘GRAIN SIZE TOP’’,‘‘SYMBOLS IN BED’’
100,‘‘/noneS’’,‘‘Limestone’’,100,‘‘vf’’,‘‘vf’’,‘‘Intense bioturbation’’
45,‘‘Sharp’’,‘‘Shale’’,100,‘‘clay’’,‘‘clay’’,‘‘/noneS’’
45,‘‘Erosion’’,‘‘Conglomerate’’,100,‘‘pebble’’,‘‘granule’’,‘‘Cephalopods’’
135,‘‘Gradational’’,‘‘Sandstone’’,100,‘‘vc’’,‘‘m’’,‘‘Trough cross bedding’’
65,‘‘/noneS’’,‘‘Sandstone’’,100,‘‘m’’,‘‘m’’,‘‘Planar cross bedding’’
50,‘‘/noneS’’,‘‘Sandstone’’,100,‘‘f’’,‘‘f’’,‘‘Current ripple crosslamination’’
60,‘‘Sharp’’,‘‘Siltstone’’,100,‘‘silt’’,‘‘silt’’,‘‘/noneS’’
35,‘‘/noneS’’,‘‘Coal’’,100,‘‘/noneS’’,‘‘/noneS’’,‘‘/noneS’’
65,‘‘Sharp’’,‘‘Siltstone’’,60,‘‘clay/silt’’,‘‘clay/silt’’,‘‘Moderate bioturbation’’
(a) Lithology, including the option of recording the proportions of
up to three different lithologies for a single bed; by default the
first lithology entered is 100%; a set of patterns are provided
for the most common lithologies and are displayed in the
drop-down menu.
(b) Type of basal contact, gradational, sharp or erosional.
(c) The grain size at the base and at the top of the bed (the basal
grain size is assumed for the whole bed unless a size is
entered for the top): the menu provides name descriptors
such as ‘coarse sand’, ‘medium-fine sand’, but the program
also records the equivalent phi scale value (Krumbein, 1934).
On the graphic log these are displayed using a scale with
increasing grain size towards the right.
(d) Sedimentary structures ‘within the bed’: a variety of symbols
is available to represent the commonest structures (trough
cross bedding, symmetrical ripples and so on) and can be
displayed as single symbols or as tiled symbols filling the
grain-size ‘curve’. The lithology patterns can also be inserted
into the grain-size column to create the merged lithology/
grain-size arrangement which is also commonly used.
(e) Symbols ‘beside the bed’: sedimentary structures, fossils and
bioturbation features can all be displayed, either singly or in
combinations in a column.
(f) A ‘Notes’ column allows for text of numerical information to
be entered.
The logs can be printed to any paper size. Zoom In, Zoom Out,
Fit page, Fit Height and Fit Width facilities are also provided to
enable the user to customise the workspace size. Sediment log
files generated by SedLog have the *.SLG extension. Template files
generated by SedLog have the *.TEM extension. SLG and TEM can
be opened and modified only from SedLog.
3.1. Data input in SedLog
The data set for a succession of rocks is built up on a bed-bybed basis. After creating a new file, information about the first bed
(the lowest) is entered via an input menu (Fig. 1). The only data
required for every bed is its thickness, and as much or as little
other information as is required can be entered initially: all data
3.2. Log format options
The columns detailed above constitute the default layout
(Fig. 2) which uses a 1:50 scale. Alternative layouts can be used,
Fig. 1. Data input menu, main interface in SedLog for entering data bed-by-bed.
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Fig. 2. Default layout for a graphic sedimentary log in SedLog. Columns may be added or removed, names and order of them changed and widths of columns modified.
with all or some of these columns, or using some of the following
additional columns:
(a) Bioturbation: this column may be used to display symbols for
different types of ichnofauna plus a value to indicate the
intensity of the bioturbation (Droser and Bottjer, 1986).
(b) Facies: a useful way of showing the facies is to use a narrow
column for each facies and filling in the column adjacent to
the appropriate beds (Fig. 3). This format can provide a quick,
visual impression of the distribution of facies within a
succession, and if the order of the columns is arranged
appropriately, for example with the shallowest depositional
environment on the left and the deepest on the right, then
shallowing or deepening trends can be recognised (e.g. Lønne
and Nemec, 2004).
(c) Palaeocurrent data is recorded bed-by-bed with multiple
entries for a single bed possible: SedLog stores the data
numerically, but it can be displayed on the graphic log either
as numbers or arrows with appropriate orientations.
(d) Columns for stratigraphic information: ‘Age’ and ‘Formation’
columns are intended to be placed on the left side of the log,
with boundaries between stratigraphic units entered at the
appropriate bed and names displayed with text aligned
vertically.
(e) Three further user-defined columns are available for entering
either text or numerical data. These may be used to record
features such as colour, the positions of samples or photographs or data that result from geochemical or other analyses.
Any of the columns can be renamed via a layout menu (Fig. 4)
and this menu can also be used to modify a number of other
aspects of the appearance of the graphic log.
Several different scales are available, from 1:10 to 1:1000;
there are also options on the intervals for display of the numbers
on the scale and the scale can either measure from bottom to top
for outcrop, or downward for depth in borehole core. The size of
the symbols, the magnification of the lithology patterns and the
font sizes can be adjusted to suit different log scales. The order of
the positions of the columns from left to right can be changed as
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Fig. 3. Customised layout, including columns for stratigraphic information on the left, facies columns, bioturbation and palaeocurrent data.
required, and the name of the column customised. The default
title at the top of the grain-size scale is a dual clastic and
carbonate scale, but either can be used on its own. The title of the
log is also inserted via this menu.
An important consideration in the design of SedLog was the
desire to allow the user as much flexibility as possible in the
appearance of the output, although there are some limitations: for
example, the total number of columns available is fixed and
symbols can be inserted only into some columns. The width of
columns can be modified on-screen by click-and-drag of the
column boundaries. Once a layout has been created it can be
saved as a template for multiple data sets.
A set of patterns for the most common lithologies are available,
divided into four groups on the input menu: basic, carbonate,
volcanic and special. New lithologies and patterns can be added,
or the existing names and patterns modified (see Section 3.3). The
lithology column may be divided to show up to three different
lithologies by proportion within a bed: if only one lithology is
entered it is assumed to be 100%.
3.3. Further customising of the graphic log
The program is provided with a number of different sets of
patterns and symbols. Patterns for the most common lithologies
are divided into four groups on the input menu: basic, carbonate,
volcanic and special. Symbols are also grouped into sedimentary
structures, fossils, trace fossils and ‘other’. Any of the patterns and
symbols can be reassigned by changing the name associated with
it. Furthermore, new patterns and symbols can be added by
importing a graphic drawn in another software package and
naming it. Graphics must be imported in SVG or Compressed
Scalable Vector Graphics (SVGZ) format, and some trial and
error is usually required to achieve an appropriate scale of the
image prior to importing the graphic. A separate menu screen
facilitates the import of user-created patterns and symbols
(Fig. 5). This makes it possible for a user to design and import a
complete set of their own patterns and symbols, also in colour for
use in SedLog.
3.4. Graphic output from SedLog
3.4.1. Screen images
The graphic log is generated by entering data for each bed via
the input screen. This can be done systematically bed-by-bed
starting from the bottom, but beds can be inserted at any point in
the succession. Individual beds can also be copied or cut and
pasted to change their position in the succession. The graphical
interface of the log display means that beds can be selected by a
mouse click and cut, copied or the input menu opened to modify
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Fig. 4. Layout menu is used to customise appearance of graphic log.
3.4.2. Printing and export
The graphic log can be directly output to a printer and by
varying the scale of the log and the paper size used, a log can be
printed onto one sheet or over several sheets. By developing
templates it is possible to standardise the appearance of graphic
logs, including using a number of different templates for different
scales or output. Export in other formats is also possible, either as
a JPEG image or as an editable PDF file: in the latter format the log
image can be imported into a drawing package and manipulated.
This option provides additional flexibility in appearance of the log
for publication or presentation purposes.
3.4.3. The log key
Each lithology pattern and symbol used in the construction
of a log is stored in a separate file containing the matches of
names and patterns/symbols used in that log. This can either be
printed as a simple key (Fig. 6), or exported as a graphics file for
reformatting.
3.5. Data export and import from/to SedLog
Fig. 5. New patterns and symbols can be added to selections available in main
input screen by importing SVG image files created in other graphics packages.
the definition and characteristics of the bed. The magnification of
the screen display can be varied using a zoom function. The same
data can be displayed in different log formats, with more or fewer
columns of information shown, as required.
3.5.1. Data export into other programs
All the information that is entered via the input menu can be
exported in a CSV format file which can be opened in a
spreadsheet program. The data for each bed are presented as a
row, with columns for each of the parameters entered for that bed
(grain size, lithology, symbols and so on). Analysis of the data can
then be carried out to determine patterns and trends in bed
thickness, grain size, facies, bioturbation intensity, etc. Palaeocurrent
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Fig. 6. As a log is generated all lithology patterns and symbols used are stored and can be output as a log key.
Table 1
Example of a CSV input file’s contents.
Thickness
Base boundary
Lithology
Lithology (%)
Grain size base
Grain size top
100
45
45
135
65
50
60
35
65
onone4
Sharp
Erosion
Gradational
onone4
onone4
Sharp
onone4
Sharp
Limestone
Shale
Conglomerate
Sandstone
Sandstone
Sandstone
Siltstone
Coal
Siltstone
100
100
100
100
100
100
100
100
100
Vf
Clay
Pebble
Vc
M
F
Silt
onone4
Clay/silt
Vf
Clay
Granule
M
M
F
Silt
onone4
clay/silt
data are stored as comma-delimited strings that can be exported
into rose diagram plotting programs. When data are stored as
descriptive text, macros can be used to convert the information
into numerical values for the analysis of the proportions of
lithologies, occurrence of sedimentary structures, fossils and so
on. Geochemical or other analytical data may be incorporated
with lithological information from the log. Data exported from
SedLog can be imported into any program that uses ASCII format:
in a pilot study data from SedLog files has been used in ‘Petrel’ by
Schlumberger7 and successfully incorporated with other stratigraphic information.
3.5.2. Data import into SedLog
SedLog includes a ‘wizard’ which can be used to take data from
a CSV spreadsheet and use it to draw a graphic sedimentary log.
For an example of a file’s contents see Table 1. The file can have
additional columns such as more than one lithology for each bed,
notes, facies, symbols, etc.
If the data have been arranged in the column order used in the
current SedLog layout, import is automatic, otherwise the column
7
http://www.slb.com/content/services/software/geo/petrel/index.asp.
names in the data can be matched to those in the layout. All the
information to create a graphic log could be entered into a
spreadsheet, and there may be circumstances where this
approach is quicker or more convenient than using the SedLog
input menu, for example when using a Portable Digital Assistant
(PDA) in the field (a PDA version of SedLog with a graphical
interface was considered but this was beyond the scope of the
current project). There can be advantages to editing a log using
the data in spreadsheet format, particularly where the same
information needs to be added to a number of beds as this can be
more quickly achieved by pasting into a spreadsheet instead of
using the input menu for each bed.
4. Application
During the development of the program it was used in a
number of research projects that involved the recording of data
from succession of strata in different settings. Output from SedLog
was subsequently used for the presentation of results in reports
and research theses. From a user’s perspective, the following
aspects of the program were found to provide significant benefits
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and the number of columns and their definitions at any point
provides important flexibility during the development of a
project.
(b) Additional patterns and symbols can easily be added, a
facility that allows the user to customise the appearance of
the log to suit the needs of a particular project or the
preferences of the user. In the example shown (Fig. 7) new
patterns to represent volcaniclastic beds were required and
the level of detail in the beds examined necessitated logging
at a suitably large scale.
(c) For presentation of the data from a succession in a research
thesis large-scale logs showing the full detail of all the beds
were required, but for illustrating the nature of a succession
in reports smaller-scale summary logs were more suitable. By
changing the scale, selecting only certain columns for output,
and carrying out some minor editing of the data set it was
possible to draw the graphic log at a new scale, avoiding the
need for redrafting.
(d) Exporting the graphics output from SedLog has proved
useful when it is desirable to incorporate the log with
other graphic materials or embed in another document.
Some variation in the ease with which the SedLog graphics could be edited with different graphics packages
was noted; the best compatibility was found to be with
CorelDraw.
5. Conclusions and availability
SedLog is easy to use yet efficient software and because it is
written in Java, is available for any platform that supports Java
(version 1.6 currently used). It is free and independent of all other
applications. The latest version of SedLog can be downloaded from
www.sedlog.com, a site hosted by Royal Holloway University of
London. In order to run the application the user first must
download the Java Runtime Environment (JRE, Version 6 Update 3
currently used), also known as the Java Virtual Machine (JVM, VM
and Java VM) from http://www.java.com/. Each operating system
requires its own JRE (see http://www.java.com for details). For
Windows users, an installer for SedLog is provided. This will
create shortcuts on the desktop and in the menu. A zip file
containing all the required binaries is also provided. Simply unzip
the file and then copy its contents to the desired directory. To run
it on a Windows machine, simply double click on the SedLog.jar
file. To run it with any other operating system, go into the SedLog
directory using a console window and type java -jar SedLog.jar.
Any contemporary computer will be able to run SedLog without
problems.
The only conditions on the use of this software are that the
program may not be sold by any user to a third party, either in its
present form or as part of any package of software or other tools.
When output from SedLog is used in publications, authors are
requested to cite this paper, or the website address of the
program, as the source.
Fig. 7. A log through Miocene Kerek Formation at Ngawi (Java Indonesia) showing
volcaniclastic sediments reworked onto a marine slope (from PhD thesis of Helen
Smyth).
compared to other means of creating and presenting graphic
sedimentary logs.
Acknowledgements
The development of this program was financed by the SE Asia
Research Group, Royal Holloway, University of London.
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