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Lineament study in the Björkö area satellite radar and airbome VLF data- possible tools for groundwater prospecting
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geodesy and Satellite Positioning.
2008 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis work mainly concerns lineament study, that is the extraction and analysis of

lineaments from satellite radar and airborne VLF data using GIS to explore potential aquifers

or groundwater locations associated in the study area (Björkö) situated west of Stockholm in

the lake Mälaren. The other objective focuses on improving the general knowledge of

hydrology, more importantly techniques and methods in lineament analysis.

The airborne VLF data for the Björkö area was received in the xyz-coordinate format. The

data have been put into a 50 m grid (spatial resolution of 50 m) and was converted into Idrisi

format using the analysis software Idrisi 32. The data was then analysed and classified into

different categories based on the relative anomaly amplitude followed by on-line digitisation

of suspected anomalies in each category. The anomalies from the different categories that

were interpreted as lineaments were further added as a single overlay.

The radar data was originally received in the Ascii version (a Grass file format). The data

have been put into a 50 m grid (spatial resolution of 50 m). The data was then converted into

Idrisi format using the Idrisi 32-analysis software. A series of filtering operations in Idrisi

were further carried out on the generated radar image from the conversion in order to enhance

it for digitisation. Different directional images resulted from the filtering operation and were

used for the digitisation of suspected anomalies interpreted as lineaments.

The result from the VLF operation shows different conductivity levels in anomalies that have

been interpreted as lineaments depicting possible fracture zones in the bedrock from good

conductors to weak conductors in the Björkö region. Lineaments derived from the radar data

represent terrain escarpments that may be related to fracture zones. The obtained result from

the maximum filtering represent terrain features at high angle to the radar incident signal.

Also terrain features with a low angle to the radar incident signal were produced from the

minimum filtering operation.

The methods employed in the study have been successful in identifying possible fracture

zones in the study area and can subsequently be applied in groundwater prospecting analysis.

Place, publisher, year, edition, pages
2008.
Series
TRITA-GIT EX ; 08-06
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-199689OAI: oai:DiVA.org:kth-199689DiVA, id: diva2:1065046
Available from: 2017-01-19 Created: 2017-01-13 Last updated: 2017-01-19Bibliographically approved

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