Geophysical Data Interpretation Deliverables

The tables below present a comprehensive list of data and information products from the interpretation of the Sierra Leone Nationwide Airborne Geophysical Survey as delivered by the contractor, Xcalibur Airborne Geophysics (XAG) and certified by the QA/QC firm, Reid Geophysics Ltd (RGL). A PDF version of the tables below can be downloaded here.

Table 01: Raw SRTM and Landsat8 Data

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Item	Subdirectory	Name	Format	Units	Description
1	Landsat8	LC082000542019011601T1-SC20190703105907	ZIP	–	Landsat 8 EROS/USGS scene package, wrs path 200, row 054, scene date 2019-01-16
2	Landsat8	LC082000552019011601T1-SC20190703105717	ZIP	–	Landsat 8 EROS/USGS scene package, wrs path 200, row 055, scene date 2019-01-16
3	Landsat8	LC082010532013122401T1-SC20190703105754	ZIP	–	Landsat 8 EROS/USGS scene package, wrs path 201, row 053, scene date 2013-12-24
4	Landsat8	LC082010542013122401T1-SC20190703105707	ZIP	–	Landsat 8 EROS/USGS scene package, wrs path 201, row 054, scene date 2013-12-24
5	Landsat8	LC082010552013122401T1-SC20190703105722	ZIP	–	Landsat 8 EROS/USGS scene package, wrs path 201, row 055, scene date 2013-12-24
6	Landsat8	LC082020532013123101T1-SC20190703113007	ZIP	–	Landsat 8 EROS/USGS scene package, wrs path 202, row 053, scene date 2013-12-31
7	Landsat8	LC082020542013123101T1-SC20190703105655	ZIP	–	Landsat 8 EROS/USGS scene package, wrs path 202, row 054, scene date 2013-12-31
8	Landsat8	LC082020552013123101T1-SC20190703105643	ZIP	–	Landsat 8 EROS/USGS scene package, wrs path 202, row 055, scene date 2013-12-31
9	SRTM	n06_w012_1arc_v3_bil	ZIP	–	NASA SRTM Version 3.0 Global 1 arc second data package, tile location: North 6° West 12°
10	SRTM	n07_w011_1arc_v3_bil	ZIP	–	NASA SRTM Version 3.0 Global 1 arc second data package, tile location: North 7° West 11°

Showing 1 to 10 of 23 entries

Table 02: Geophysical grids

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Item	Subdirectory	Name	Format	Units	Description
1	Magnetics	TMI	Geosoft .GRD, ERMapper .ERS	nT	Total magnetic intensity
2	Magnetics	ANS/AS	Geosoft .GRD, ERMapper .ERS	nT/m	Analytic signal
3	Magnetics	RTEI	Geosoft .GRD, ERMapper .ERS	nT	TMI reduced to the equator (inverted)
4	Radiometrics	Dose	Geosoft .GRD, ERMapper .ERS	nGy/h	Dose rate
5	Radiometrics	K	Geosoft .GRD, ERMapper .ERS	%	Potassium
6	Radiometrics	eTh	Geosoft .GRD, ERMapper .ERS	ppm	Equivalent uranium
7	Radiometrics	eU	Geosoft .GRD, ERMapper .ERS	ppm	Equivalent thorium

Showing 1 to 7 of 7 entries

Table 03: Processed SRTM and Landsat8

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Item	Subdirectory	Name	Format	Units	Description
1	Landsat	L8_b2_sr_cm	Geotiff *.TIF	–	Mosaicked Landsat 8 band 2, surface reflectance, cloud masked
2	Landsat	L8_b3_sr_cm	Geotiff *.TIF	–	Mosaicked Landsat 8 band 3, surface reflectance, cloud masked
3	Landsat	L8_b4_sr_cm	Geotiff *.TIF	–	Mosaicked Landsat 8 band 4, surface reflectance, cloud masked
4	Landsat	L8_b5_sr_cm	Geotiff *.TIF	–	Mosaicked Landsat 8 band 5, surface reflectance, cloud masked
5	Landsat	L8_b6_sr_cm	Geotiff *.TIF	–	Mosaicked Landsat 8 band 6, surface reflectance, cloud masked
6	Landsat	L8_b7_sr_cm	Geotiff *.TIF	–	Mosaicked Landsat 8 band 7, surface reflectance, cloud masked
7	Landsat	L8_NDWI_cm	Geotiff *.TIF	–	Mosaicked Landsat normalized difference water index, cloud masked
8	Landsat	L8_NDVI_cm	Geotiff *.TIF	–	Mosaicked Landsat normalized difference vegetation index, cloud masked
9	Landsat	L8_True_Color	Geotiff *.TIF	–	Landsat 8 true colour composite (R:band 4, G: band 3, B: band 2), balanced contrast enhanced, cloud masked
10	Landsat	L8_B543	Geotiff *.TIF	–	Landsat 8 false colour composite, vegetation infrared (R:band 5, G: band 4, B: band 3), balanced contrast enhanced, cloud masked

Showing 1 to 10 of 16 entries

Table 04: Processed Geophysical Grids

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Item	Subdirectory	Name	Format	Units	Description
1	Magnetics	RTEI_1VD	Geosoft .GRD, ERMapper .ERS	nT/m	First vertical derivative of RTEI
2	Magnetics	RTEI_2VD	Geosoft .GRD, ERMapper .ERS	nT/m^2	Second vertical derivative of RTEI
3	Magnetics	RTEI_TDR	Geosoft .GRD, ERMapper .ERS	radians	Vertical tilt angle from RTEI
4	Magnetics	RTEI_TDX	Geosoft .GRD, ERMapper .ERS	radians	Horizontal tilt angle from RTEI
5	Magnetics	RTEI_HG	Geosoft .GRD, ERMapper .ERS	nT/m	Total horizontal derivative of RTEI
6	Magnetics	RTEI_XGRAD	Geosoft .GRD, ERMapper .ERS	nT/m	X gradient of RTEI
7	Magnetics	RTEI_YGRAD	Geosoft .GRD, ERMapper .ERS	nT/m	Y gradient of RTEI
8	Magnetics	RTEI_Up200	Geosoft .GRD, ERMapper .ERS	nT	RTEI upward continuation, 200 m
9	Magnetics	RTEI_Up1000	Geosoft .GRD, ERMapper .ERS	nT	RTEI upward continuation, 1000 m
10	Magnetics	RTEI_Up5000	Geosoft .GRD, ERMapper .ERS	nT	RTEI upward continuation, 5000 m

Showing 1 to 10 of 16 entries

Table 05: Processed Geophysical Images

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Item	Subdirectory	Name	Format	Units	Description
1	Magnetics	TMI	Geotiff *.TIF	nT	Total magnetic intensity
2	Magnetics	TMI_ss	Geotiff *.TIF	nT	Total magnetic intensity, sun shaded inclination 45°, declination 45°
3	Magnetics	AS	Geotiff *.TIF	nT/m	Analytic signal
4	Magnetics	AS_ss	Geotiff *.TIF	nT/m	Analytic signal, sun shaded inclination 45°, declination 45°
5	Magnetics	RTEI	Geotiff *.TIF	nT	TMI reduced to the equator (inverted)
6	Magnetics	RTEI_ss	Geotiff *.TIF	nT	TMI reduced to the equator (inverted), sun shaded inclination 45°, declination 45°
7	Magnetics	RTEI_1VD	Geotiff *.TIF	nT/m	First vertical derivative of RTEI
8	Magnetics	RTEI_1VD_ss	Geotiff *.TIF	nT/m	First vertical derivative of RTEI, sun shaded
9	Magnetics	RTEI_1VD_bw	Geotiff *.TIF	nT/m	First vertical derivative of RTEI, black and white
10	Magnetics	RTEI_2VD	Geotiff *.TIF	nT/m^2	Second vertical derivative of RTEI

Showing 1 to 10 of 33 entries

Table 06: Semi-Automated Interpretation

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Item	Subdirectory	Name	Format	Units	Description
1	Magnetic Lineaments	Sierra_Leone_CET_Lineament_Edges	Shapefile *.SHP	–	Edges (contacts) derived from RTEi_TDX grid
2	Magnetic Lineaments	Sierra_Leone_CET_Lineament_Peaks	Shapefile *.SHP	–	Peaks (positive responses) derived from RTEi_TDR grid
3	Magnetic Lineaments	Sierra_Leone_CET_Lineament_Troughs	Shapefile *.SHP	–	Troughs (negative responses) derived from RTEi_TDR grid
4	Keating Correlation Coefficients	SL_Keating_Correlation_ASIG	Shapefile .SHP, Geosoft .GDB	–	Keating correlation results from the analytic signal grid
5	Keating Correlation Coefficients	SL_Keating_Correlation_TMI	Shapefile .SHP, Geosoft .GDB	–	Keating correlation results from the TMI grid
6	Keating Correlation Coefficients	SL Keating Model Grids	Geosoft *.GRD	–	Keating correlation coefficient model grids (TMI and AS) used in each sub-block
7	Keating Correlation Coefficients	SL_Keating.map	Geosoft *.Map	–	Keating results as Geosoft MAP
8	Keating Correlation Coefficients	SL_Keating_Readme_v3	Word *.docx	–	Keating README file
9	Keating Correlation Coefficients	Keating Channel Descriptions	Text *.txt	–	channel descriptions for Keating GDB

Showing 1 to 9 of 9 entries

Table 07: Depth Analysis Layers

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Item	Subdirectory	Name	Format	Units	Description
1	SPI	SierraLeone_SPI	Geosoft *.GDB	–	Database of calculated depth values and altimeter adjustments
2	SPI	SPI Channel Descriptions	Text *.txt	–	channel descriptions for SPI GDB
3	SPI	SierraLeone_SPI_Depth	Geosoft .GRD, ERMapper .ERS, Geotiff *.tif	–	Gridded SPI depth below ground surface
4	Euler	SierraLeone_Located_Euler	Geosoft *.GDB	–	Database of Located Euler depth solutions
5	Euler	SierraLeone_Located_Euler_SI1	Shapefile *.SHP	–	Shapefile of Located Euler depth solutions (SI=1)
6	Euler	SierraLeone_Located_Euler_SI2	Shapefile *.SHP	–	Shapefile of Located Euler depth solutions (SI=2)
7	Euler	Euler deconvolution analysis summary_v3	Word *.docx	–	Euler README file
8	Euler	Euler deconvolution Channel Descriptions	Text *.txt	–	channel descriptions for Euler GDB

Showing 1 to 8 of 8 entries

Table 08: 3D Inversions

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Item	Name	Format	Units	Description
1	SierraLeone_VOXI.map	Geosoft *.Map	–	Packed Geosoft map of model block outlines and magnetic susceptibility at various depths and elevations
2	SierraLeone_VOXI.geosoft_3dv	Geosoft *.geosoft_3dv	–	Geosoft packed map containing nine susceptibility models and MVI vectors, merged susceptibility model and isosurface
3	SierraLeone_VOXI_Block_Models.zip	ZIP	–	VOXI MVI model sessions for each of the nine individual blocks
4	SierraLeone_Nationwide_VOXI.map	Geosoft *.Map	–	Packed Geosoft map of the nationwide block outline and magnetic susceptibility at various depths and elevations
5	SierraLeone_Nationwide_VOXI.geosoft_3dv	Geosoft *.geosoft_3dv	–	Geosoft packed map containing the nationwide susceptibility model, MVI vectors, and isosurface
6	SierraLeone_Nationwide.geosoft_voxi.data	ZIP	–	VOXI MVI model session for country wide inversion
7	SL_VOXI_Regional_Readme_v3.docx	Word *.docx	–	VOXI README file
8	Bagbe Alkalic Complex.geosoft_3dv	Geosoft *.geosoft_3dv	–	Geosoft 3D packed map containing the susceptibility model, MVI vectors, and isosurface for the Bagbe Alkali Complex
9	Bagbe_Alkalic_Complex_VOXI.map	Geosoft *.Map	–	Geosoft 2D packed map containing the block outline and magnetic susceptibility at various depths and elevations for the Bagbe Alkali Complex
10	Freetown Layered Complex.geosoft_3dv	Geosoft *.geosoft_3dv	–	Geosoft 3D packed map containing the susceptibility model, MVI vectors, and isosurface for the Freetown Complex

Showing 1 to 10 of 35 entries

Table 09: Interpretation Maps PDF

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Item	Subdirectory	Name	Format	Units	Description
1	250k	Geophysical Interpretation – Basement Geology Freetown	PDF	–	Basement geology interpretation map, Freetown sheet, 1:250,000
2	250k	Geophysical Interpretation – Basement Geology Gbangbama	PDF	–	Basement geology interpretation map, Gbangbama sheet, 1:250,000
3	250k	Geophysical Interpretation – Basement Geology Pujehun	PDF	–	Basement geology interpretation map, Pujehun sheet, 1:250,000
4	250k	Geophysical Interpretation – Basement Geology Moyamba	PDF	–	Basement geology interpretation map, Moyamba sheet, 1:250,000
5	250k	Geophysical Interpretation – Surficial Geology Batkanu	PDF	–	Surficial geology interpretation map, Batkanu sheet, 1:250,000
6	250k	Geophysical Interpretation – Surficial Geology Daru	PDF	–	Surficial geology interpretation map, Daru sheet, 1:250,000
7	250k	Geophysical Interpretation – Surficial Geology Freetown	PDF	–	Surficial geology interpretation map, Freetown sheet, 1:250,000
8	250k	Geophysical Interpretation – Surficial Geology Gbangbama	PDF	–	Surficial geology interpretation map, Gbangbama sheet, 1:250,000
9	250k	Geophysical Interpretation – Surficial Geology Kabala	PDF	–	Surficial geology interpretation map, Kabala sheet, 1:250,000
10	250k	Geophysical Interpretation – Surficial Geology Kissidugu	PDF	–	Surficial geology interpretation map, Kissidugu sheet, 1:250,000

Showing 1 to 10 of 22 entries

Table 10: Kimberlite Targets

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Item	Subdirectory	Name	Format	Units	Description
1	–	east_picks	Geosoft *.GDB	–	East block targets
2	–	west_picks	Geosoft *.GDB	–	West block targets
3	–	Kimberlite_Targets	Shapefile *.SHP	–	Country wide targets
4	–	Kimberlite Targets Channel Description	Text *.txt	–	Channel descriptions for east/west/shapefile/appendix
5	–	Kimberlite Targeting Report_v3a	Word *.docx, PDF	–	Targeting report (pdf)
5	–	Appendix 1	Excel *.xlsx	–	Targets

Showing 1 to 6 of 6 entries

Table 11: Mineral Favourability

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Item	Subdirectory	Name	Format	Units	Description
1	–	Bauxite_Favourability	ERMapper .ERS, Geotiff .TIF	%	Bauxite favourability
2	–	Gold_Favourability	ERMapper .ERS, Geotiff .TIF	%	Gold favourability
3	–	Nickel_Favourability	ERMapper .ERS, Geotiff .TIF	%	Nickel favourability
4	–	Rutile_Favourability	ERMapper .ERS, Geotiff .TIF	%	Rutile favourability
5	–	Fe_Targets	Shapefile *.SHP	–	Iron targets
6	–	README_v3	Word *.docx	–	Mineral favourability readme

Showing 1 to 6 of 6 entries

Table 12 & 13: Report & Interpretation Maps

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Item	Subdirectory	Name	Format	Units	Description
1	–	Sierra Leone Interpretation Report_v3	Word *.docx, PDF	–	Interpretation report
2	–	Interpretation Maps GIS	ZIP	–	ArcGIS MXD package
3	–	SL_Interpretation Maps GIS_Readme_v2	Word *.docx	–	Readme file

Showing 1 to 3 of 3 entries

Table 14: Master GIS

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Item	Subdirectory	Name	Format	Description
1	–	Geology	ZIP	Geology vector and geotiff images, NMA mineral occurrence database
2	–	Geophysical Grids	ZIP	Geophysical grids
3	–	Geophysical Images	ZIP	Geophysical grid images
4	–	Geophysical Interpretation – Master GIS Sierra Leone_10.0	ESRI MXD	ArcGIS v10.0 MXD project file
5	–	Geophysical Interpretation – Master GIS Sierra Leone_10.3	ESRI MXD	ArcGIS v10.3 MXD project file
6	–	Geophysical Interpretation – Master GIS Sierra Leone_10.8.1	ESRI MXD	ArcGIS v10.8.1 MXD project file
7	–	Geophysical Interpretation	ZIP	Geophysical interpretation vectors
8	–	Geophysical Layers	ZIP	Manual and semi-automated geophysical interpretation vectors
9	–	Index	ZIP	Survey and sheet index maps
10	–	Logos	ZIP	Company logos

Showing 1 to 10 of 12 entries

Geophysical Data Interpretation Deliverables

Table 01: Raw SRTM and Landsat8 Data

Table 02: Geophysical grids

Table 03: Processed SRTM and Landsat8

Table 04: Processed Geophysical Grids

Table 05: Processed Geophysical Images

Table 06: Semi-Automated Interpretation

Table 07: Depth Analysis Layers

Table 08: 3D Inversions

Table 09: Interpretation Maps PDF

Table 10: Kimberlite Targets

Table 11: Mineral Favourability

Table 12 & 13: Report & Interpretation Maps

Table 14: Master GIS

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