ncies across a given space, but is inadequate for the production of point-plotted distribution maps.

When using random distributions, point-plotted maps appear to be more “realistic” than those of uniform distribution. Research has shown that assigning a random spatial reference within an excavated area can provide a reliable, statistically identical representation of the spatial distribution of artifacts [18]. Taking this into consideration, common programs such as Microsoft® Access or Microsoft® Excel can easily be used to assign new, random coordinates within a given excavation unit, thus allowing spatial analysis. Random distributions may result in artificial “clusters” of material that may affect further analyses such as density maps and cluster analyses. Generally, however, the different plotting methods do not have a major effect on simple density analyses (Figure 2).

Figure 1. Three approaches to plotting (b-d), illustrated in a 25 m2 grid: (a) grid with number of recorded artifacts; (b) central plotting; (c) random plotting; (d) uniform plotting. N = 500 “artifacts” recorded within 625 grid cells.

Figure 2. Density maps produced with different plotting methods (data as in Figure 1): (a) Raster representation of relative frequencies per excavated grid square (Figure 1(a)); (b) Kernel density map of centrally plotted data; (c) Kernel density map of randomly plotted data; (d) Kernel density map of uniformly plotted data.

3.2. Digitization and Plotting of Sections and Field Maps

In addition to artifacts recorded and collected during excavation, archaeologists return from the field with a variety of recorded data. These include excavation diaries, individual excavation sheets (e.g., pro-forma sheets), sections, general site plans, plans of individual excavation areas, and field drawings of exposed surfaces or of specific features and installations. As previously stated, it is essential for all these records to adhere to a shared spatial reference so that their spatial relationships—horizontal (two-dimensional) and vertical (three-dimensional)— can be established. Prior to the computerized plotting of these data, it is the excavator’s job to determine which records are of relevance to the desired reconstruction and to provide the information required for the reconstruction.

The selected plans should undergo a digitization process in which all field drawings are scanned to raster format (JPG, TIFF), and later traced using drafting software to create a vector drawing. Through the digitization process, each raw archaeological data (stratigraphic as well as spatial units) is converted into digital form for later spatial analysis using spatial analysis software. The example below used AutoCAD LT®, a commercial computer-aided design (CAD) and drafting program developed and marketed by Autodesk. The native file format of AutoCAD LT® is dwg., which serves as the standard for CAD data interoperability, particularly for 2D drawing exchange.

In the example below, computerized plotting is further complicated by the fact that the archaeological levels are tilted due to tectonic activity and tilting of the entire package of sediments at the site. Such circumstances may be relevant to other sites as well, where the occupational surface is sloped or uneven rather than horizontal, and should be plotted and analyzed as such.

4. Restructuring Gesher Benot Ya’aqov

Gesher Benot Ya’aqov (GBY) is an Early to Middle Pleistocene archaeological site located in the course and on the banks of the Jordan River, Israel. Excavations exposed a 34-meter depositional sequence in which 15 archaeological levels have been recorded. The GBY sequence consists of a reversed-polarity zone overlaid by a normal-polarity zone, correlated with the 0.79 Ma Matuyama-Brunhes chron boundary; the entire depositional sequence is assigned to OIS 18—20 and its estimated duration is 100,000 years. Archaeological data indicate that Acheulian hominins regularly occupied the margins of Paleo Lake Hula, where they produced stone tools [19], used and controlled fire [20], processed meat [21], and gathered a vast range of plant food, which has been preserved due to the waterlogged environment [22]. Tectonic activity on the transform fault of the Dead Sea Rift has resulted in the tilt of the strata at the site. The tilted archaeological horizons are embedded within a generally fine-grained sedimentary sequence, documenting rapid shifts in an abundance of carbonate and organic materials typical of a low-energy, fluctuating lake margin environment. The site was excavated in seven field seasons between 1989 and 1997, using traditional recording methods [19].

4.1. Field Recording

Excavation of GBY was carried out in three main areas, all located on the eastern bank of the Jordan River (Figure 3). A horizontal 1 × 1 m grid was constructed above the excavated surfaces, corresponding to the Israeli Transverse Mercator (ITM) geographic coordinate system. The ITM was used to position and orient the physical grid in the study area, serving as a reference system for the spatial location of all finds originating in the excavations. During the first two field seasons (1989 and 1990) the grid was simply laid down on the horizontal surface of the excavation area. As differences in elevation (caused by exposure of the sediments along the strike and dip) were jeopardizing the accuracy of the grid, a suspended grid system was applied to the entire excavation area starting with the 1991 field season. The grid system formed units of 1 m2, each subdivided equally into four sub-squares. The southwestern corner of each square was the zero point for readings of x and y coordinates. Strings with fishing weights attached to their ends (plumb lines) were used to form the four corners of each square meter and to mark the boundaries of the square for each grid on the tilted horizons (Figure 3).

To allow for observation of the stratigraphic sequence, six trenches were mechanically excavated by a backhoe, perpendicularly to the strike of the bedding.

Cross-sections: Two types of cross-sections, both to a scale of 1:10, were part of the routine excavation and recording methodology. The first were drawn in accordance with the grid system, so as to make possible reconstruction of the configuration of the entire excavated volume. The second were drawn perpendicularly to the layers in order to identify the detailed relationship between the various superimposed levels in Areas B and C. These cross-sections were based on an imaginary horizontal line from which measurements were taken perpendicularly all along the tilted excavation surfaces (Figure 3). Following the “peeling” of the archaeological horizon and the exposure of the underlying one, the same procedure was repeated, thus forming an accumulative cross-section. These are “phantom” cross-sections that do not exist as a standing profile.

Figure 3. (a) The GBY study area: map of trenches and excavation areas; (b) Schematic illustration of Area B demonstrating different methodologies used during field drafting: in the foreground a drawing of an exposed surface (field map) and in the background a drawing of cross-sections perpendicular to the layer. Note the freestanding grid and the strings marking the strike of the levels.

Lateral exposure: Excavation started with the removal of recent deposits (the unconformity), including redeposited Pleistocene material underlying recent sediments, in order to expose the Lower-Middle Pleistocene bedding. The horizontal (plan view) section of the underlying Pleistocene deposits was drawn to document the stratigraphy. After exposure of the Pleistocene sediments and their stratigraphy, the excavation of the deposits began with the exposure of the tilted beds (each observed, for enhanced control, in the adjacent trench as well). The archaeological horizons were all exposed along the strike and dip of the layer/level. Upon completion of the lateral exposure of each artifact-bearing horizon, the finds were mapped and photographed, and their spatial provenance was recorded before removal.

X, Y, and Z recording: The complete spatial reference (X, Y, and Z) was recorded for “coordinated pieces” that consist mostly of items larger than 2 cm. Other items retrieved during excavation, the “uncoordinated pieces,” were labeled according to the spatial reference of the spit (i.e., excavated unit/sub-square and elevation range). Such items can thus be located with a precision of 0.5 × 0.5 × 0.05 m. In addition to material retrieved during excavation, the entire excavated volume of sediments representing the archaeological horizons was wet-sieved during fieldwork using a 2 mm sieve. The wet-sieved sediments were then bagged with their recorded spit location. Sorting of the sieved sediments yielded rich and varied assemblages, such as fruits, seeds, grains, bones and teeth of micromammals, fish, and crabs, specks of charcoal, and stone objects ranging in size from 2 to 20 mm.

Elevations of surfaces and excavated items were read in reference to sea level, based on a fixed excavation datum (benchmark). Elevations were measured with folding carpenter’s rulers and were determined with the use of a string line and line level attached to a nearby datum stake referenced to the site’s benchmark. Elevations were measured on the exposed tilted surface of each excavation unit (a 0.5 m2 sub-square to a depth of 5 cm) at the beginning and end of each excavation session. Initial and final measurements were taken on the tilted exposed surfaces and on the same points of each square: the northeastern (uppermost) point and the southwestern (lowermost) point, each marked on the excavator’s sheets. Two elevation readings were also taken for each find (stone, including natural pieces, bone, and wood) larger than 2 cm, the first on top of the item and the second on the surface below it after its removal, thus providing the thickness of the item. Top and bottom elevations of these items were also marked on the map of each of the archaeological horizons.

Mapping archaeological horizons: The exposed occupational levels were mapped in detail to a scale of 1:5. The mapping was done as if perpendicularly to the tilted artifact-bearing horizon, a view that is consequently not related to the grid system. Correlation of the grid to each of the maps was accomplished by marking the location of each plumb line (representing the corners of each square meter on the grid) on the tilted surface. In cases of superimposed artifact surfaces (levels) such as those of Layer II-6, several lines were marked on the horizontal surface of the unconformity above the excavated surface (Figure 3). Each of these lines, delineated by parallel white strings, marked the location of an archaeological horizon and its strike. Whenever possible, a preliminary identification of each item (handaxe, cleaver, flake, core, bone, or piece of wood, usually of large dimensions) was recorded on the map.

4.2. Converting Field Records to Geographical Information

The analyzed assemblages from GBY are organized in two different types of Access databases. In the first, which consists mostly of items larger than 2 cm, each database row incorporates the attributes of a single item. The second type of database consists only of small items, retrieved through sorting of the sieved sediments; here, each row incorporates the total content of a sediment unit (i.e., of an excavated spit). The difference between these two databases required separate procedures in order to convert the data into spatially manageable geographical information; more specifically, the database in which the entire content of an excavated spit was depicted in a single row had to be converted into a “single-record row” database. This conversion made possible the spatial plotting of all items, as discussed below.

For each excavated item, the recorded data includes stratigraphic assignment and provenance recording (either a full X, Y, Z reference or a 0.5 × 0.5 m quadrant and a range of elevations). Many items were retrieved with a general spatial reference, either during excavation or throughout the sorting of the wet-sieved sediments. The spatial reference for these includes the X and Y quadrant (0.5 × 0.5 m) and depth of spit (with Z being a range of depths). Such spatial recording allows only the representation of relative frequencies of lithic items per excavated unit. Other spatial analyses, such as the creation of a density map, would necessitate measuring the distances between features and thus require that the data be depicted as distinct points.

Using the Visual Basic language within Microsoft® Access, items with a general spatial reference were given a new reference point within their recorded sub-square. This procedure made it possible to plot each of the excavated finds and included the following stages: Each archaeological layer was treated independently within a separate database. The database was then sorted according to the recorded excavation units of the particular layer. Each of these excavation units had a defined excavated area (0.5 × 0.5 m sub-squares or 1 × 1 m squares), from which a certain number of items was retrieved. This area (a) was then divided by the maximum number of items retrieved from that area (n) so that each item could be plotted separately within an a/n area (δ). For example, if a given excavated area measuring 1 m2 (a = 1) has 100 items (n = 100), and these 100 items are distributed evenly within the 1 m2 area, each item occupies an area of 1/100 m2 (δ = 0.01). The new reference point for each of these items is defined as the southwestern corner of each δ cell, so that: a = ∑δ1-n1 + δ2 + δ3 + δ4 … δn).

This procedure makes it possible to plot the items uniformly within their recorded spit, ensuring that the newly plotted data are as consistent as possible with the recorded data, to the degree of precision of a sub-square.

Several procedures required a three-dimensional representation of the data (e.g., assigning a stratigraphic classification, as described below). In these cases, the vertical position (Z coordinate) of the items was essential. As previously discussed, many “uncoordinated” pieces were retrieved from the field with a recorded range of elevations. Due to the tilt of the archaeological exposures, elevations were recorded in two corners of the excavated unit, northeastern (NE) and southwestern (SW), at the beginning (TOP) and end (BOTTOM) of each excavation session (defined as a 5 cm spit of excavated material). In order to convert these elevations into a single Z point, the average of the recorded elevations was calculated so that the new Z point represented the elevation at the center (both vertical and horizontal) of the excavated unit: NEW Z = {[(NETOP + NEBOTTOM)/2] + [(SWTOP + SWBOTTOM)/2]}/2.

4.3. Digitization and Plotting of Cross-Sections and Field Maps

The drawn archaeological data (field maps and cross-sections) was digitized using AutoCAD LT® software. The digitization process included several stages:

1) Each scanned plan was treated in an individual AutoCAD file.

2) Prior to drafting, the scanned plan was resized in accordance with its actual scale.

3) Drafting on top of the scanned plans used the “layers” feature available in AutoCAD. This made it possible to assign different “layers” to distinct stratigraphic units, building a uniform cartographic legend for the site’s stratigraphic units.

4) Drafting attempted to capture features as closed polygons to facilitate later analysis.

5) Once an item was drawn in AutoCAD, different attributes could be added to its table description by double-clicking the drawn feature. This made it possible to incorporate other map data into the digitized map (e.g., the catalogue number of a drawn feature, elevation, typological identification). Incorporating the catalogue number, for example, would allow for later joining of the drawn map with the analysis databases, based on their common catalogue number (Figure 4).

6) Once all features of the plan were digitized, all elements in the drawing were selected and anchored to their original recorded spatial location. This procedure involved the simple “move” and “rotate” tools available in AutoCAD. If the digitized plan was oriented properly and to scale, plotting required only one spatial reference point within the plan, which was selected and moved to its actual grid location. This point, however, had to have known X, Y, and Z coordinates; the Z value was then determined for the entire plan.

These stages are satisfactory for horizontal, two-dimensional plans that are by default plotted at a uniform elevation.

Plotting three-dimensional plans (e.g., sections) requires additional procedures. The transformation from a two-dimensional depiction to a three-dimensional position requires a 3D rotation of the entire plan. The rotation axis should be one for which the accurate elevation is known.

1) When the plan is selected and the rotation axis is defined, the angle of rotation should be specified (e.g., 90 degrees when attempting to position a cross-section).

2) Other circumstances that may require non-horizontal positioning are cases where the archaeological remains are not bedded horizontally. This can be the result of an uneven occupational surface, a slope, or a tilted surface, as in the tilted layers at GBY. In such cases, the bottom elevations of the archaeological material should be recorded and the plan (field map) should be plotted according to the recorded elevations of the archaeological material (Figure 5).

Following the digitization and plotting, the individual maps and cross-sections can be assembled into a single file, either in AutoCAD or in ArcScene, to produce a complete three-dimensional model of the site (Figure 6). The converted databases of excavated artifacts can then be integrated into the model as well (Figure 6).

Figure 4. GBY Layer II-6, Level 4: (a) close-up view; (b) segment of the field map, facing east, with black crosses marking the corners of the grid square on the tilted horizon; (c) the field map after digitization, positioning, and joining with analysis databases (colors correspond to AutoCAD layers documenting the typological identification carried out in the field: pink for bifacial tools, white for cores and flakes, and green for wood segments).

Figure 5. The elephant skull horizon of Layer II-6, Level 1: (a) During excavation; (b) The digitized field map in plan view; (c) The digitized field map in its original tilted position: view from Trench II to southeast.

4.4. Archaeological Input

The digital reconstruction of the excavated areas of GBY was used to illustrate the study area as well as to assess different aspects of stratigraphic, spatial, and volumetric questions.

Stratigraphic assignment: Layers I-4 and I-5 were exposed in 1989, the first season of renewed excavations, when fieldwork focused on two areas: the southeastern part of the study area (Area A) and about 45 m to the northwest (Area B) (Figure 3). In Area A, the tilted nature of the archaeological horizons was revealed during excavation (Figure 7). Upon the quarrying of Trench I, the observed archaeological layers were assigned individual reference names (I-4 and I-5). These two layers, observed in various sections within the excavated area, exhibited a sedimentological divergence between gray clay (I-4) and a coquina mixed with sandy and clayey lenses (I-5) (Figure 7). As excavation proceeded, the distinction between these two horizons became evident and material was given a definite stratigraphic assignment. However, for some of the excavated material no stratigraphic assignment was specified. These circumstances resulted in an excavated assemblage in which some of the material was recorded with a full spatial reference (i.e., excavated grid unit, range of elevations, and specific layer), while other material lacks a record of the stratigraphic assignment. In order to allow spatial plotting of the excavated material from Area A, it was necessary to determine the stratigraphic position of some of the excavated assemblages. Using ArcScene (ESRI® ArcSceneTM), the three-dimensional data analysis software in the ArcGIS package, the entire lithic assemblage of Area A was plotted three-dimensionally and then divided into two separate stratigraphic units. The division was made possible by a “virtual” 3D surface designed to depict the tilted contact between I-4 and I-5. The outlines of this “contact surface” follow the contact lines of I-4/5 as drawn in the various field cross-sections; thus items above the surface were assigned to I-4 and items below it to I-5 (Figure 8).

Figure 6. Area B—digitization and positioning of sections: (a) View of the northern face of Trench II; (b) General view of Area B during excavation of Layer II-1; (c) Three-dimensional view of cross-sections in Area B (view to northeast); the grey surface is the raster expression of the final elevations measured throughout the excavated area at the end of fieldwork.

Figure 7. (a) General view of Area A looking north; (b) The stratigraphic position of Layers I-4 and I-5 as seen in a corner of an excavated square.

Figure 8. Three-dimensional views of the excavations and cross-sections in Area A: (a) View to the southeast; (b) View to the northwest; (c) The contact surface between Layers I-4 and I-5 and the distribution of flint flakes above (brown, Layer I-4) and below (red, Layer I-5) the surface.

Spatial analysis: The GBY reconstruction project was used as the basis for a thorough spatial analysis of the archaeological material. This included the identification of phantom hearths and the continual use of fire at the site [23] and the identification of spatial patterning of activities [24]. The plotting of different lithic, faunal, and botanical assemblages made possible the analysis of spatial patterns within the reconstructed excavation area, using both data recorded in the field and data obtained from the analysis of the excavated material. Figure 9 illustrates the combination of different recorded data for the spatial analysis of one occupational level: Layer II-6, Level 2. This spatial analysis used a variety of recorded data, including artifacts retrieved with a general spatial reference, plotted uniformly to produce kernel density maps (of burnt flint microartifacts), databases of finds retrieved with their precise X and Y coordinates (basalt anvils in Figure 9(b), wood pieces in Figure 9(c)), and the map of the exposed surface drawn in the field.

Figure 9. Layer II-6, Level 2: (a) Field map superimposed on density map of burnt flint microartifacts (N = 550); (b) Field map superimposed on density map of burnt flint microartifacts and distribution of basalt anvils (purple squares) and basalt pitted anvils (dotted circles); (c) Field map superimposed on density map of burnt flint microartifacts and distribution of unburnt (green dots) and burnt (black dots) wood pieces.

5. Discussion and Conclusions

The fact that archaeological excavation is often regarded as a destructive process contributes to continuous advancement in developing methods for recording archaeological field data. At the present time, innovative computerized methods are used sporadically in fieldwork to achieve precise conversion of recorded archaeological data into three-dimensional site models. Despite this progress, many sites are still being excavated, as in the past, using traditional recording methods and not producing digital records. This paper drew attention to the possibility of converting traditional records, too, into digital data and generating a 3D reconstruction of an archeological site. Such reconstructions are valuable for not only displaying the site graphically, but also resolving stratigraphic, spatial, and volumetric questions.

A major component of any spatial reconstruction is the method of recording, which varies among cultural periods, site types, and scholars. The plotting methodologies presented in this paper are suitable for a variety of recording methods, as well as for a variety of recording data, illustrating the feasibility of three-dimensional site reconstruction. Two key categories of recording data, available in virtually all archaeological projects, are required for an adequate three-dimensional reconstruction. The first comprises drawn material (e.g., field maps and cross-sections); the second consists of the archaeological finds themselves (e.g., artifacts, bones, and installations) removed from the site with some sort of recorded provenance. Archaeological finds are rarely retrieved with their precise X, Y, and Z coordinates, so plotting is required. The three suggested plotting approaches (central, random, and uniform) do not differ substantially for the purpose of simple display of artifact frequencies or densities. Other spatial questions may, however, require a point-plotted approach (random or uniform). The other category of recorded data—drawn maps and sections—provides the overall stratigraphic and spatial context of the archaeological finds. If they adhere to a shared spatial reference, these can be scanned, digitally traced, and plotted to their accurate spatial positions in order to construct a 3D model of the site. Though not used in the project presented here, photographs can be treated similarly to drawn material and can be integrated into the 3D model, provided they capture a shared spatial reference and an appropriate scale.

The case of GBY illustrated the feasibility of reconstructing a site that was excavated some 20 years ago and presents inherent structural and stratigraphic complications. The meticulous excavation methods used during fieldwork at the site provided sufficient data to make 3D reconstruction possible. In turn, this reconstruction provided a means to resolve stratigraphic uncertainties and to carry out in-depth spatial analysis.

The assertion of Roosevelt et al. that “archaeology has always been inherently real world and 3D, yet until recently it has had to rely on 2D abstractions of 3D realities” ( [6]: p. 326) is further reinforced in the present study, suggesting that even when not done during fieldwork, digitization is straightforward, feasible, and stratigraphically and spatially beneficial.

Cite this paper
Alperson-Afil, N. (2019) Digitizing the Undigitized: Converting Traditional Archaeological Records into Computerized, Three-Dimensional Site Reconstruction. Journal of Geographic Information System, 11, 747-765. doi: 10.4236/jgis.2019.116045.
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