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Data Source
The following are the list of data used in this GVRD model analysis:
| Data Theme |
Format |
File |
Source |
Original Projection |
Original Geographic Extent |
| Soils |
IDRISI, Access Table |
sois.rdc, soils.mdb |
Vines server of the Geography 355 SFU SISLAB S:\355_DATA\Data\gvrd\gen\ |
Universal Transverse Mercator Zone 10 |
GVRD |
| 25m DEM |
IDRISI |
gvrd_dem.rdc |
Vines server of the Geography 355 SFU SISLAB S:\355_DATA\Data\gvrd\gen\ |
Universal Transverse Mercator Zone 10 |
GVRD |
| Landuse |
IDRISI |
landuse.rdc |
Vines server of the Geography 355 SFU SISLAB S:\355_DATA\Data\gvrd\gen\ |
Universal Transverse Mercator Zone 10 |
GVRD |
| Municipalities |
ESRI shapefile |
muni.shp |
Vines server of the Geography 355 SFU SISLAB S:\355_DATA\GIS
Data\GVRD\ |
Universal Transverse Mercator Zone 10 |
GVRD |
| Faults |
ESRI shapefile |
faults_bc_dd.shp |
Downloaded from The
MapPlace Geospatial Downloads - Ministry of Energy of Mines. Original
shapefile was zipped into faults_bc_dd.zip |
Geographic Lat/Long |
BC |
| Bedrock |
ESRI shapefile |
bedrock_bc_dd.shp |
Downloaded from The
MapPlace Geospatial Downloads - Ministry of Energy of Mines. Original
shapefile was zipped into bedrock_bc_dd.zip |
Geographic Lat/Long |
BC |
Data Manipulation Steps
- Soil.rdc were exported into ESRI shapefile in IDRISI for use in clipping
the Faults and Bedrock shapefile such that both themes cover only GVRD
instead of the entire BC. The ArcView extention themecatalog.avx
downloaded from ESRI ArcScripts website is used to produce a Soil extent
polygon. This soil extent polygon is then used to clip the Faults and
Bedrock using the XTools in ArcView.
- All ESRI shapefiles (Municipalities, clipped Faults and clipped Bedrock)
are imported to IDRISI vector format (.vdc) using the SHAPEIDR module
to produce muni.vdc, faults_lldd.vdc, bedrock_lldd.vdc.
- Reprojected both Faults and Bedrock IDRISI vector version from Geographic
Lat/Long to UTM 10 using the latlong.ref and utm-10n.ref in PROJECTED
module. The reprojected faults and bedrock are called faults.vdc and
bedrock.vdc.
- Convert muni.vdc, fault_lldd.vdc and bedrock_lldd.vdc from IDRISI
vector format to IDRISI raster format using the POLYRAS module. Soil.rdc
is used as the image for copying the column, row, and coordinate parameters.
The resulted files are muni.rdc, faults.rdc, and bedrock.rdc.
- Three String type attributes in Soil.mdb were classified into codes.
They are LITHOLOGY, DESCRIPTIN,
THICKNESS (Click on each to see the
attribute and corresponded values). These codes are then assigned to
each soil polygon in soil.rdc using ASSIGN module to produce lithology.rdc,
descriptin.rdc, and thickness.rdc.
- Two String type attributes in bedrock_bc_dd.dbf were classified into
codes. They are STRAT_AGE, and ROCK_TYPE
(Click on each to see the attribute and corresponded code values). These
codes are then assigned to each bedrock polygon in bedrock.rdc to produce
stratage.rdc and bedrocktype.rdc.
The analysis are then based on the above bolded data. They are again
listed below for quick reference:
| Data File name |
Data Theme |
Purpose |
| lithology.rdc |
Soil Lithology |
Soil Lithology terms can be used for deriving the age
of deposit which then used for deriving the liquefcation suspectibility.
See Figure 4.2.2 from QUATERNARY
GEOLOGY OF SOUTHEASTERN VANCOUVER KLANlOl AND GULF ISLANDS by
Ministry of Energy and Mines on corresponding age for each lithology
term. |
| descriptin.rdc |
Soil Texture Description |
Soil Texture used for deriving the liquefaction suspectibilty
and amplification hazard. |
| thickness.rdc |
Soil Thickness |
Soil Thickness used for deriving amplification hazard. |
| stratage.rdc |
Stratigraphic age |
Bedrock stratigraphic age used for deriving the liquefaction
suspectibility. |
| bedrocktype.rdc |
Bedrock type |
Bedrock type used for deriving bedrock slope stability |
| faults.rdc |
Fault lines |
Used for deriving earthquake intensity based on closeness
to fault lines |
| muni.rdc |
Municipality |
Used for geographic location reference and as constraint
during MCE analysis (Refer to Methodology
section for more information) |
| landuse.rdc |
Landuse |
Used as constraint during MCE analysis (Refer to Methodology
section for more information) |
| gvrd_dem.rdc |
25m DEM |
Used to derive slope and aspect for slope instability
analysis. Also used for deriving ortho image and elevation data value. |
Click on Methodology to see the methods used
for the analysis using the above data.
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