archaeological gis on infrastructural projects in ireland
TRANSCRIPT
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The use of GIS on large scale infrastructural projects in Ireland.
Excavation, post-excavation and publication.
Maurizio Toscano
Eachtra Archaeological Projects
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EAP GIS experience
• Eachtra started using GIS in September 2007
• 3 roads schemes involved – GIS implemented at different stages of the projects
• To date all projects still in progress
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Roads projects involved
• N8 FM (29 sites): from the post-excavation phase (previously done in CAD/Excel)
• N7 CN (25 sites): from the middle of the excavation phase
• N18 OG (21 sites): from the beginning of the excavation phase
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Eachtra Documentation System
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Our purpose using GIS
We have chosen to structure our platform based upon Arnoff’s definition (1989):
a computer based system that provides four sets of capabilities to handle geo-referenced data:
• data input• data management (data storage and retrieval)
• manipulation and analysis• data output
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Data management
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Database structure
Stratigraphic Index
Finds Photos Samples
1:M
Skeleton Sheets Drawings Masonry Sheets
Specialists Reports
1:M1:1 1:1
Stratigraphic Index
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Eachtra Archaeological Projects Office Database
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GIS Data Model
Landscape
Project
Master FileContour, townlands, lake & rivers, RMP sites, roads
Excavation areas, CPO line, OS data, test trenches, chainage
Site
Graphics
Tables
Relationships
Negative features (Cut, Furrow, N.A.)Positive features (Deposit, Wall, Bank, Pavement)Characterization (Break of slope, stone)Section
Site (Excavation area, grid)
Stratigraphic Index, Finds Register, Samples Register, Photo Register
Fills > Finds and Samples
Features > Attributes
Features > Photos
Cuts > Fills
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Data input
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Limit of excavation and local grid
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Permatrace plans
• Individual plans are drawn by grid square (5x5 m.);
• Each grid square plan is then scanned as a raster file.
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Permatrace plans
Each grid square plan is then put into place by matching up the grid square points on the permatrace drawing to the corresponding grid square points on the GIS site plan.
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Permatrace plansPlans ‘stitched’ together
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Permatrace plansThe composite raster plan created:
– Makes it easier to see if something is missing / wrong;
– Avoids searching through archive boxes and numerous plans to find the plan you’re looking for;
– Stores the Irish grid position and can be placed directly in the right position into others programs / GIS platforms;
– Represents a comprehensive digital archive for all the post-ex sites drawings.
Using this method, unlike when using CAD and a drawing tablet, we can zoom into the plan and digitise up to 1:1 scale, respecting the real shape of the object giving a higher degree of accuracy to the final drawing.
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Geometry
All the digitized graphs are stored in the database and classified according to logic scheme previously created;
– Positive units like polygon objects, because they represents real surfaces;
– Negative units like linear objects, because of their nature of surface without material consistency;
– Characterisations like linear objects, because they are used just to describe the aspect of the features;
– Section like linear objects, because of their nature of arbitrary boundaries.
Thanks to the connected database, all digitized drawings are “stratigraphically informed”.
Stratigraphical units are organized into three types, with relative subtypes, and represented with a specific geometry:
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Aerial photo
Enclosure:Perimeter 220 m.Area 3.000 sq. m.
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Geophysical data
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Historical maps
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Manipulation and analysis
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Overlay
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Database query• There are two types of possible queries in a GIS
platform: spatial and on attributes:
– Spatial queries are used to identify / select objects depending on their mutual position;
– Query on attributes can be performed using SQL (Structured Query Language) and are used to identify / select objects through one or more of their attributes;
• An example of SQL query:SELECT * FROM neg_features WHERE c_type LIKE “stakehole” AND deep > 0.1 AND period NOT LIKE “Bronze Age”
• This query selects all of the stakeholes deeper than 10 cm and that are not of Bronze Age in date.
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Statistical and Tabular Analysis
469Count
290.9Maximum
24.5Minimum
39.4Standard Deviation
109.3Mean
3.1
19.8
27.7
17.5 18.5
13.4
0.4
22.8
42.4
21.3
12.6
0.40
5
10
15
20
25
30
35
40
45
40 80 120 160 240 900
Height Classes
Per
cen
tag
e
Landscape Fulacht Fiadh
0
5
10
15
20
25
30
35
40
5 20 35 50 65 80 95 110 125 140 155 170 185 200 215 230 245 260 275 290
Altitude in meters
Qu
anti
ty o
f F
ula
cht
Fia
dh
0%
20%
40%
60%
80%
100%
Cu
mu
lati
ve
fre
qu
ec
y cu
rve
Study Area
147.6Mean
904.9Maximum elevation
0Minimum elevation
2827.4 km2 Extent
Fulacht fiadh altitude analysis
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Statistical and Tabular Analysis
469Count
1949.8Maximum
0Minimum
369.0Standard Deviation
381.0Mean
Fulacht fiadh river distance analysis
0
10
20
30
40
50
60
70
80
90
100
50 150
250
350
450
550
650
750
850
95010
5011
5012
5013
5014
5015
5016
5017
5018
5019
50
Distance in meters to nearest water resource
Qu
an
tity
of
Fu
lac
h F
iad
h0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Cu
mu
lati
ve
fre
qu
en
cy
cu
rve
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Digitized planSite excavation
Hypothesis of reconstruction
Analysis of dimensions
Perimeter of post-line 24.2 m.
Area inside post-holes 45 sq.m.
Area inside the wall 63.8 sq.m.
Analysis of internal geometry
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Density
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Digital Terrain Model: a kiln
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Digital Terrain Model: a site
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Data output
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Post-ex plans
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Post-ex plans
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Post-ex plans
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Topographical maps
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Thematic maps
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Thematic plans
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Distribution maps
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Distribution maps
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Benefits of GIS
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Benefits on data management
• Ideally, any kind of archaeological data can be input and manipulated in a GIS platform;
• Archaeology produces a vast amount of data, often underused because of difficulties to access and relating to them;
• At the end of the project, the GIS platform represents a complete digital archive, giving post-ex researchers a powerful tool to improve the degree of accuracy of site interpretation;
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Benefits during project development
• GIS methodology requires an organised and standardised approach to everything undertaken, involving all workflow from data-recording techniques to on-site data entry and digital storing;
• Vector data are suited to transfer into paper publication but also ready for amalgamation with other datasets as our future needs require;
• GIS approach transform plans from an illustration of something already completed to an instrument of research.
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There may be a reluctance to adopt a GIS platform to replace a CAD/Illustrator approach.
Firstly a GIS technician is required and a certain amount of time is needed at start-up, but carrying out the project, time to perform different tasks will be reduced and results can
be better.
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The use of GIS on large scale infrastructural projects in Ireland.
Excavation, post-excavation and publication.
Maurizio Toscano
Eachtra Archaeological Projects