ping is an interpretive process involving multiple types of information, from analytical data to personal observation, all synthesized and recorded by the geologist. Geologicobservations have traditionally been recorded on paper, whether on standardized note cards, in a notebook, or on a map.
In the 21st century, computer technology and software are becoming portable and powerful enough to take on some of the more mundane tasks a geologist must perform in the field, such as precisely locating oneself with a GPS unit, displaying multiple images, plotting strike and dip symbols, and color-coding different physical characteristics of a lithology or contact type between rock strata. Additionally, computers can now perform some tasks that were difficult to accomplish in the field, for example, handwriting or voice recognition and annotating photographs on the spot. Digital mapping has positive and negative effects on the mapping process; only an assessment of its impact on a geological mapping project as a whole shows whether it provides a net benefit. With the use of computers in the field, the recording of observations and basic data management changes dramatically. The use of digital mapping also affects when data analysis occurs in the mapping process, but does not greatly affect the process itself.
Advantages
Data entered by a geologist may have fewer errors than data transcribed by a data entry clerk.
Data entry by geologists in the field may take less total time than subsequent data entry in the office, potentially reducing the overall time needed to complete a project.
The spatial extent of real world objects and their attributes can be entered directly into a database with geographic information system capability. Features can be automatically color-coded and symbolized based on set criteria.
Multiple maps and imagery can easily be carried and displayed on-screen.
Geologists may upload each other's data files for the next day's field work as reference.
Data analysis may start immediately after returning from the field, since the database has already been populated.
Data can be constrained by dictionaries and dropdown menus to ensure that data are recorded systematically and that mandatory data are not forgotten
Labour-saving tools and functionality can be provided in the field e.g. structure contours on the fly, and 3D visualisation
Systems can be wirelessly connected to other digital field equipment
Disadvantages
Computers and related items must be carried in the field.
Field data entry into the computer may take longer than physically writing on paper, possibly resulting in longer field programs.
Data entered by multiple geologists may contain more inconsistencies than data entered by one person, making the database more difficult to query.
Written descriptions convey to the reader detailed information through imagery that may not be communicated by the same data in parsed format.
Geologists may be inclined to shorten text descriptions because they are difficult to enter, resulting in loss of data.
There are no original, hardcopy field maps or notes to archive. Paper is a more stable medium than digital format.
Educational and scientific uses
Some universities and secondary educators are integrating digital geologic mapping into class work. For example, The GeoPad project describes the combination of technology, teaching field geology, and geologic mapping in programs such as Bowling Green State University’s geology field camp. At Urbino University :it:Università di Urbino, Field Digital Mapping Techniques are integrated in Earth and Environmental Sciences courses since 2006 . The MapTeach program is designed to provide hands-on digital mapping for middle and high school students. The SPLINT project in the UK is using the BGS field mapping system as part of their teaching curriculum Digital mapping technology can be applied to traditional geologic mapping, reconnaissance mapping, and surveying of geologic features. At international digital field data capture meetings, major geological surveys discuss how to harness and develop the technology. Many other geological surveys and private companies are also designing systems to conduct scientific and applied geological mapping of, for example, geothermal springs and mine sites.
Equipment
The initial cost of digital geologic computing and supporting equipment may be significant. In addition, equipment and software must be replaced occasionally due to damage, loss, and obsolescence. Products moving through the market are quickly discontinued as technology and consumer interests evolve. A product that works well for digital mapping may not be available for purchase the following year; however, testing multiple brands and generations of equipment and software is prohibitively expensive.
Common essential features
Some features of digital mapping equipment are common to both survey or reconnaissance mapping and “traditional” comprehensive mapping. The capture of less data-intensive reconnaissance mapping or survey data in the field can be accomplished by less robust databases and GIS programs, and hardware with a smaller screen size.
Devices and software are intuitive to learn and easy to use
, as typically defined by military standards and ingress protection ratings
Features essential to capture traditional geologic observations
Hardware and software only recently became available that can satisfy most of the criteria necessary for digitally capturing "traditional" mapping data.
Screen about 5" x 7"—compact but large enough to see map features. In 2009, some traditional mapping is conducted on PDAs.
Lightweight—ideally less than 3 lbs.
Transcription to digital text from handwriting and voice recognition.
Since every geologic mapping project covers an area with unique lithologies and complexities, and every geologist has a unique style of mapping, no software is perfect for digital geologic mapping out of the box. The geologist can choose to either modify their mapping style to the available software, or modify the software to their mapping style, which may require extensive programming., available geologic mapping software requires some degree of customization for a given geologic mapping project. Some digital-mapping geologists/programmers have chosen to highly customize or extend ESRI's ArcGIS instead. At digital field data capture meetings such as at the British Geological Survey in 2002 some organisations agreed to share development experiences, and some software systems are now available to download for free.
